java攻城狮之路(Android篇)--MP3 MP4、拍照、国际化、样式主题、图片移动和缩放
一、MP3播放器
查看Android API文档可以看到MediaPlayer状态转换图：
练习：
package com.shellway.mp3player; import java.io.File; import java.io.IOException; import android.support.v7.app.ActionBarActivity; import android.telephony.PhoneStateListener; import android.telephony.TelephonyManager; import android.content.Context; import android.media.MediaPlayer; import android.media.MediaPlayer.OnPreparedListener; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends ActionBarActivity { //媒体播放器 private MediaPlayer mp; private EditText songName; //之前是否暂停过 private boolean pause; private File file; private TelephonyManager tm; //暂停保存点 private int position = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); songName = (EditText) findViewById(R.id.song_name); tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); tm.listen(new MyPhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE); } private class MyPhoneStateListener extends PhoneStateListener{ @Override public void onCallStateChanged(int state, String incomingNumber) { // TODO Auto-generated method stub super.onCallStateChanged(state, incomingNumber); switch (state) { case TelephonyManager.CALL_STATE_IDLE://闲置状态 if (position > 0 && mp != null) { //跳转到指定的保存点位置 mp.seekTo(position); mp.start(); } break; case TelephonyManager.CALL_STATE_OFFHOOK://接听状态 if(mp != null){ if(mp.isPlaying()){ position = mp.getCurrentPosition(); mp.pause(); } } break; case TelephonyManager.CALL_STATE_RINGING://响铃状态 if (mp.isPlaying()) { position = mp.getCurrentPosition(); mp.pause(); } break; default: break; } } } //这里是利用Activity生命周期的方法监听来电时暂停播放 // @Override // protected void onResume() { // // TODO Auto-generated method stub // super.onResume(); // if(position > 0){ // //跳转到指定的位置 // mp.seekTo(position); // mp.start(); // } // } // // @Override // protected void onPause() { // // TODO Auto-generated method stub // super.onPause(); // position = mp.getCurrentPosition(); // mp.pause(); // } public void play(View view){ String name = songName.getText().toString(); file = new File(Environment.getExternalStorageDirectory(),name+".mp3"); if (!file.exists()) { Toast.makeText(this, "文件不存在", Toast.LENGTH_SHORT).show(); mp=null; }else{ if (mp!=null) { if (mp.isPlaying()) { Toast.makeText(this, "歌曲已经在播放中", Toast.LENGTH_SHORT).show(); }else{ play(); } }else{ play(); } } } public void play(){ try { mp = new MediaPlayer(); //置为初始状态 mp.reset(); //指定要播放的文件 mp.setDataSource(file.getAbsolutePath()); //准备(缓冲) mp.prepare(); //设置缓冲完成监听 mp.setOnPreparedListener(new MyOnPreparedListener()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } private class MyOnPreparedListener implements OnPreparedListener{ @Override public void onPrepared(MediaPlayer mp) { // TODO Auto-generated method stub //播放 mp.start(); } } public void pause(View view){ if (mp.isPlaying()) { //暂停播放 mp.pause(); Button bt = (Button) view; bt.setText("继续"); pause = true; }else{ if (pause) { mp.start(); Button bt = (Button) view; bt.setText("停止"); } } } public void stop(View view){ if (mp!=null) { //停止播放 mp.stop(); } } public void reset(View view){ if (mp!=null) { mp.start(); } } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); if (mp != null) { mp.release(); mp = null; } } }
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="请输入歌曲名" /> <EditText android:id="@+id/song_name" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Complicated" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:onClick="play" android:text="播放" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:onClick="pause" android:text="暂停" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:onClick="stop" android:text="停止" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:onClick="reset" android:text="重播" /> </LinearLayout> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.shellway.mp3player" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <!-- 监听来电状态需要读取电话状态权限 --> <uses-permission android:name="android.permission.READ_PHONE_STATE"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
运行结果截图：
二：MP4播放器
MP4的播放同MP3的差不多，主要是在显示视频的控件上的区别
package com.shellway.mp4player; import java.io.File; import java.io.IOException; import android.support.v7.app.ActionBarActivity; import android.media.MediaPlayer; import android.media.MediaPlayer.OnCompletionListener; import android.media.MediaPlayer.OnPreparedListener; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends ActionBarActivity { private MediaPlayer mp; private EditText et_name; private File file; private boolean pause ; private SurfaceView surfaceview; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et_name = (EditText) findViewById(R.id.et_name); surfaceview = (SurfaceView) findViewById(R.id.surfaceview); SurfaceHolder holder = surfaceview.getHolder(); //给SurfaceView设置屏幕分辨率 holder.setFixedSize(176, 144); //给SurfaceView设置保持高亮 holder.setKeepScreenOn(true); //不让surfaceview维持自己的缓冲，让它得到的数据直接输出 holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void play(View view){ String name = et_name.getText().toString(); file = new File(Environment.getExternalStorageDirectory(),name+".mp4"); Log.i("i", file.getAbsolutePath()); if (!file.exists()) { Toast.makeText(this, "播放文件不存在", Toast.LENGTH_SHORT).show(); }else{ //开始播放 play(); } } public void play(){ try { mp = new MediaPlayer(); mp.reset(); mp.setDataSource(file.getAbsolutePath()); //设置显示画面 mp.setDisplay(surfaceview.getHolder()); mp.prepare(); mp.setOnPreparedListener(new MyOnPreparedListener()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } private class MyOnPreparedListener implements OnPreparedListener{ @Override public void onPrepared(MediaPlayer mp) { // TODO Auto-generated method stub mp.start(); } } public void pause(View view){ if (mp != null) { if (mp.isPlaying()) { mp.pause(); pause = true; }else{ mp.start(); pause = false; } } } public void stop(View view){ if (mp != null) { mp.stop(); } } public void reset(View view){ if (mp != null) { mp.reset(); play(); } } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); if (mp != null) { mp.release(); mp = null; } } }
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="请输入要播放的视频名称:" /> <EditText android:id="@+id/et_name" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="test" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dp" android:onClick="play" android:src="@drawable/play" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dp" android:onClick="pause" android:src="@drawable/pause" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dp" android:onClick="stop" android:src="@drawable/stop" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dp" android:onClick="reset" android:src="@drawable/reset" /> </LinearLayout> <SurfaceView android:id="@+id/surfaceview" android:layout_width="fill_parent" android:layout_height="240dp" ></SurfaceView> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.shellway.mp4player"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
运行结果截图：
三、手机拍照
照相机的一些属性：
预览帧数：preview-frame-rate=30
图片质量：jpeg-thumbnail-quality=90
图片尺寸：preview-size-values=1280x720,800x480,768x432,720x480,640x480,480x320,176x144
SurfaceView只有当activity显示到了前台，该控件才会被创建。
只有当surfaceView被创建了，才把相机所捕获到的数据输出给它。
如果activity回到回台。surfaceview又会被销毁
注意：在拍照的时候相机是被占用的。拍照之后需要重新预览。
练习：
package com.shellway.takephoto; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import android.support.v7.app.ActionBarActivity; import android.hardware.Camera; import android.hardware.Camera.Parameters; import android.hardware.Camera.PictureCallback; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView; import android.view.View; import android.view.Window; import android.view.WindowManager; public class MainActivity extends ActionBarActivity { private SurfaceView surfaceview; private Camera camera; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //请求窗体特征：设置不显示标题，注意要在setContentView之前设置 requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); //设置全屏幕显示 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); surfaceview = (SurfaceView) findViewById(R.id.surfaceview); SurfaceHolder holder = surfaceview.getHolder(); //设置屏幕分辨率 holder.setFixedSize(176, 144); //设置屏幕保持高亮 holder.setKeepScreenOn(true); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); holder.addCallback(new MySurfaceCallback()); } private class MySurfaceCallback implements Callback{ @Override public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub try { //打开相机 camera = Camera.open(); Parameters params = camera.getParameters(); //设置照片的尺寸 params.setPictureSize(800, 480); //设置预览帧数，为了兼容2.3以前版本还是加上好 params.setPreviewFrameRate(5); //设置照片质量 params.setJpegQuality(80); camera.setParameters(params); //设置预览显示 camera.setPreviewDisplay(surfaceview.getHolder()); //设置开始预览 camera.startPreview(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub //释放相机资源 if (camera != null) { camera.release(); camera = null; } } } public void takephoto(View view){ //参数：shutter 开门被按下, raw 相机所捕获的原始数据, jpeg 相机处理的数据 camera.takePicture(null, null, new MyPictureCallback()); } private class MyPictureCallback implements PictureCallback{ @Override public void onPictureTaken(byte[] data, Camera camera) { // TODO Auto-generated method stub try { File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".jpg"); FileOutputStream fos = new FileOutputStream(file); fos.write(data); //记得拍照存完数据到存储卡后还要给相机设置继续预览 camera.startPreview(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public void autofocus(View view){ //这里是由相机硬件为我们自动对焦 } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); if (camera != null) { camera.release(); camera = null; } } }
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.shellway.takephoto.MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> <SurfaceView android:id="@+id/surfaceview" android:layout_width="fill_parent" android:layout_height="fill_parent" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" > <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dp" android:onClick="autofocus" android:text="对焦" ></Button> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dp" android:text="拍照" android:onClick="takephoto" ></Button> </LinearLayout> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.shellway.takephoto" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <!-- 获取相机的拍照权限 --> <uses-permission android:name="android.permission.CAMERA"/> <!-- 获取外存储设备的写权限 --> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <!-- 设置横屏显示属性 screenOrientation--> <activity android:name=".MainActivity" android:label="@string/app_name" android:screenOrientation="landscape"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
运行结果截图：下图是在真实手机上运行的截图
四、视频刻录
查看Android API文档可以看到MediaRecoder状态转换图，用它来实现视频的刻录：
package com.shellway.videorecoder; import java.io.File; import java.io.IOException; import android.support.v7.app.ActionBarActivity; import android.media.MediaRecorder; import android.os.Bundle; import android.os.Environment; import android.view.Menu; import android.view.MenuItem; import android.view.Surface; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.Button; public class MainActivity extends ActionBarActivity { //声明一个媒体刻录机 private MediaRecorder mr; //因为是动态视图，可以用SurfaceView来展示 private SurfaceView surfaceview; private Button bt_start; private Button bt_stop; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); surfaceview = (SurfaceView) findViewById(R.id.surfaceview); SurfaceHolder holder = surfaceview.getHolder(); //设置屏幕分辨率 holder.setFixedSize(176, 144); //设置屏幕保持高亮 holder.setKeepScreenOn(true); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); bt_start = (Button) findViewById(R.id.bt_start); bt_stop = (Button) findViewById(R.id.bt_stop); } public void start(View view){ try { //创建一个媒体刻录机 mr = new MediaRecorder(); //在给刻录机设置属性前首先要重置一下 mr.reset(); //设置音频、视频来源 mr.setAudioSource(MediaRecorder.AudioSource.MIC); mr.setVideoSource(MediaRecorder.VideoSource.CAMERA); //设置音频、视频输出格式 mr.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); //设置音频、视频的编码 mr.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); mr.setVideoEncoder(MediaRecorder.VideoEncoder.H264); //创建一个输出音频、视频的文件 File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis()+".3gp"); mr.setOutputFile(file.getAbsolutePath()); //设置预览 mr.setPreviewDisplay(surfaceview.getHolder().getSurface()); //准备刻录 mr.prepare(); //开始刻录 mr.start(); //开始刻录后，按钮可见的转变 bt_start.setEnabled(false); bt_stop.setEnabled(true); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void stop(View view){ //停止刻录 mr.stop(); //停止刻录后，按钮可见的转变 bt_start.setEnabled(true); bt_stop.setEnabled(false); //释放资源 mr.release(); mr = null; } }
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.shellway.videorecoder.MainActivity" > <SurfaceView android:id="@+id/surfaceview" android:layout_width="fill_parent" android:layout_height="fill_parent" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" > <Button android:id="@+id/bt_start" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dp" android:onClick="start" android:text="开始" ></Button> <Button android:id="@+id/bt_stop" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dp" android:onClick="stop" android:enabled="false" android:text="停止" ></Button> </LinearLayout> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.shellway.videorecoder" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <!-- 使用相机的权限 --> <uses-permission android:name="android.permission.CAMERA"/> <!-- 媒体刻录机的权限 --> <uses-permission android:name="android.permission.RECORD_AUDIO"/> <!-- 外存储写的权限 --> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <!-- 设置一开始就横屏显示 --> <activity android:name=".MainActivity" android:label="@string/app_name" android:screenOrientation="landscape"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
运行结果截图：
五：手势识别
首先，使用系统给出的应用Gestures Builder画出手势库，然后把手势库导出到桌面，最后在工程res目录下
新建一个raw文件(这个文件表示原文件，编译的时候不会对它做任何修改)，我这里画的一个打勾和“Z”字母，
打勾表示拨打电话号码为5556的电话，“Z”字母表示退出本应用程序。
练习：
package com.shellway.gestures; import java.util.ArrayList; import android.support.v7.app.ActionBarActivity; import android.R.anim; import android.content.Intent; import android.gesture.Gesture; import android.gesture.GestureLibraries; import android.gesture.GestureLibrary; import android.gesture.GestureOverlayView; import android.gesture.GestureOverlayView.OnGesturePerformedListener; import android.gesture.Prediction; import android.net.Uri; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.Toast; public class MainActivity extends ActionBarActivity { private GestureOverlayView gov; private GestureLibrary library; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); gov = (GestureOverlayView) findViewById(R.id.gov_id); //加载监听 gov.addOnGesturePerformedListener(new MyOnGesturePerformedListener()); //加载手势库 library = GestureLibraries.fromRawResource(this, R.raw.gestures); library.load(); } private class MyOnGesturePerformedListener implements OnGesturePerformedListener{ @Override public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) { // 识别手势 ArrayList<Prediction> predictions = library.recognize(gesture); if (predictions.isEmpty()) { Toast.makeText(getApplicationContext(),"手势不存在", Toast.LENGTH_SHORT).show(); }else{ //拿到手势库里面的第一个，即最匹配的手势 Prediction prediction = predictions.get(0); //给匹配度打分，分是从0-10 double score = prediction.score; if (score>=6) { //手势的名字 String name = prediction.name; if (name.equals("call")) { Intent intent = new Intent(); intent.setAction(Intent.ACTION_CALL); intent.setData(Uri.parse("tel:"+5556)); startActivity(intent); }else if(name.equals("exit")){ //利用杀死进程的方法退出程序 android.os.Process.killProcess(android.os.Process.myPid()); } }else{ Toast.makeText(getApplicationContext(),"匹配度太低", Toast.LENGTH_SHORT).show(); } } } } }
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <android.gesture.GestureOverlayView android:id="@+id/gov_id" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1" ></android.gesture.GestureOverlayView> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="确定" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="取消" /> </LinearLayout> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.shellway.gestures" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <!-- 拨打电话权限 --> <uses-permission android:name="android.permission.CALL_PHONE"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
运行结果截图：
可以支持多笔手势：需要做如下改动
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <!-- 要支持多笔手势就要加上gestureStrokeType这个属性，因为默认是单笔手势 --> <android.gesture.GestureOverlayView android:id="@+id/gov_id" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1" android:gestureStrokeType="multiple" ></android.gesture.GestureOverlayView> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:onClick="ok" android:text="确定" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:onClick="cancel" android:text="取消" /> </LinearLayout> </LinearLayout>
package com.shellway.gestures; import java.util.ArrayList; import android.support.v7.app.ActionBarActivity; import android.R.anim; import android.content.Intent; import android.gesture.Gesture; import android.gesture.GestureLibraries; import android.gesture.GestureLibrary; import android.gesture.GestureOverlayView; import android.gesture.GestureOverlayView.OnGestureListener; import android.gesture.GestureOverlayView.OnGesturePerformedListener; import android.gesture.Prediction; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.widget.Toast; public class MainActivity extends ActionBarActivity { private GestureOverlayView gov; private GestureLibrary library; private Gesture gesture; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); gov = (GestureOverlayView) findViewById(R.id.gov_id); //加载监听 // gov.addOnGesturePerformedListener(new MyOnGesturePerformedListener()); //这个是支持多笔手势的监听 gov.addOnGestureListener(new MyOnGestureListener()); //加载手势库 library = GestureLibraries.fromRawResource(this, R.raw.gestures); library.load(); } private class MyOnGestureListener implements OnGestureListener{ @Override public void onGestureStarted(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub Log.i("i", " onGestureStarted "); } @Override public void onGesture(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub Log.i("i", " onGesture "); } @Override public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub Log.i("i", " onGestureEnded "); //拿到当前的手势 gesture = overlay.getGesture(); } @Override public void onGestureCancelled(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub Log.i("i", " onGestureCancelled "); } } private class MyOnGesturePerformedListener implements OnGesturePerformedListener{ @Override public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) { //overlay：表示当前的手势，gesture表示最后的手势 recognize(gesture); } } public void ok(View view){ recognize(gesture); gov.clear(true); } public void cancel(View view){ gov.clear(true); } // 识别手势 private void recognize(Gesture gesture) { ArrayList<Prediction> predictions = library.recognize(gesture); if (predictions.isEmpty()) { Toast.makeText(getApplicationContext(),"手势不存在", Toast.LENGTH_SHORT).show(); }else{ //拿到手势库里面的第一个，即最匹配的手势 Prediction prediction = predictions.get(0); //给匹配度打分，分是从0-10 double score = prediction.score; if (score>=6) { //手势的名字 String name = prediction.name; if (name.equals("call")) { Intent intent = new Intent(); intent.setAction(Intent.ACTION_CALL); intent.setData(Uri.parse("tel:"+5556)); startActivity(intent); }else if(name.equals("exit")){ //利用杀死进程的方法退出程序 android.os.Process.killProcess(android.os.Process.myPid()); } }else{ Toast.makeText(getApplicationContext(),"匹配度太低", Toast.LENGTH_SHORT).show(); } } } }
多笔手势监听方法的测试：
八、通知：Notification
之前我们学了提示用户的两种方式：Toast 、AlertDialog
现在我们来看看通知Noitification,它主要由以下六部分组成：
图标、ticker提示信息、时间、标题、内容、事件
练习：
package com.shellway.notification; import android.support.v7.app.ActionBarActivity; import android.R.anim; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.RemoteViews; public class MainActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void notification(View view){ //得到通知管理器 NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); //构建通知 Notification notification = new Notification(android.R.drawable.stat_notify_chat, "这是一个提示信息", System.currentTimeMillis()); //通知的点击事件 Intent intent = new Intent(this,MainActivity.class); //第二个参数为请求码，可随意指定。第四个参数为标志码，我们这里填0就可以了 PendingIntent pendingIntent = PendingIntent.getActivity(this, 100, intent, 0); notification.setLatestEventInfo(this, "通知标题", "通知内容", pendingIntent); //点击后消失 notification.flags = Notification.FLAG_AUTO_CANCEL; //发送通知 notificationManager.notify(100, notification); } public void customnotification(View view){ //得到通知管理器 NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); //构建通知 Notification notification = new Notification(); notification.icon = android.R.drawable.stat_notify_call_mute;//图标 notification.tickerText = "新的信息来啦";//通知提示信息 //自定义通知内容布局 RemoteViews remoteviews = new RemoteViews(getPackageName(), R.layout.contentview); notification.contentView = remoteviews; //定义通知内容 Intent intent = new Intent(this,MainActivity.class); PendingIntent paIntent = PendingIntent.getActivity(this, 100, intent, 0); notification.contentIntent = paIntent; //点击后消失 notification.flags = Notification.FLAG_AUTO_CANCEL; //发送通知 notificationManager.notify(100, notification); } }
package com.shellway.notification; import android.app.Activity; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; public class OtherActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.contentview); } }
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="notification" android:text="普通通知" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="customnotification" android:text="自定义通知" /> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_launcher" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="新收到10条短信" /> <ProgressBar android:layout_width="fill_parent" android:layout_height="wrap_content" style="@android:style/Widget.ProgressBar.Horizontal" ></ProgressBar> </LinearLayout> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.shellway.notification" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".OtherActivity"></activity> </application> </manifest>
运行结果截图：
九、动画(Animation)
我们可以查官方文档中API Guies可以看到
根据它，我们可以进行以上提到的两种动画的开发工作
练习1：tween动画,首先在res目录下新建文件夹anim，然后在其下面建立动画xml文件
package com.example.tweenanimation; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.ImageView; public class MainActivity extends ActionBarActivity { private ImageView iv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); iv = (ImageView) findViewById(R.id.iv); } public void start(View view){ //加载动画 // Animation anim = AnimationUtils.loadAnimation(this, R.anim.alpha);//图片透明度 // Animation anim = AnimationUtils.loadAnimation(this, R.anim.scale);//图片缩放 // Animation anim = AnimationUtils.loadAnimation(this, R.anim.translate);//图片移动 // Animation anim = AnimationUtils.loadAnimation(this, R.anim.rotate);//图片旋转 Animation anim = AnimationUtils.loadAnimation(this, R.anim.set);//以上综合 //执行动画 iv.startAnimation(anim); } }
<?xml version="1.0" encoding="utf-8"?> <!-- FillAfter,动画的最后一帧是否保持在View上面，FillEnabled是否启用Fill保持 --> <alpha xmlns:android="http://schemas.android.com/apk/res/android" android:fromAlpha="1" android:toAlpha="0" android:duration="2000" android:fillAfter="true" > </alpha>
<?xml version="1.0" encoding="utf-8"?> <!-- pivotX 若填5表示旋转5个像素， 若填5%表示相对自身旋转5%，若填5%p表示相对父元素旋转--> <rotate xmlns:android="http://schemas.android.com/apk/res/android" android:fromDegrees="0" android:toDegrees="90" android:pivotX="50%" android:pivotY="50%" android:duration="2000" > </rotate>
<?xml version="1.0" encoding="utf-8"?> <!-- FillAfter,动画的最后一帧是否保持在View上面，FillEnabled是否启用Fill保持 --> <scale xmlns:android="http://schemas.android.com/apk/res/android" android:fromXScale="1" android:toXScale="2" android:fromYScale="1" android:toYScale="0.5" android:duration="2000" android:fillAfter="true" > </scale>
<?xml version="1.0" encoding="utf-8"?> <translate xmlns:android="http://schemas.android.com/apk/res/android" android:fromXDelta="0" android:toXDelta="100" android:fromYDelta="0" android:toYDelta="100" android:fillAfter="true" android:duration="2000" > </translate>
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <alpha android:fromAlpha="1" android:toAlpha="0" android:duration="2000" android:fillAfter="true" /> <scale android:fromXScale="1" android:toXScale="2" android:fromYScale="1" android:toYScale="0.5" android:duration="2000" android:fillAfter="true" /> <translate android:fromXDelta="0" android:toXDelta="100" android:fromYDelta="0" android:toYDelta="100" android:fillAfter="true" android:duration="2000" /> <rotate android:fromDegrees="0" android:toDegrees="90" android:pivotX="50%" android:pivotY="50%" android:duration="2000" /> </set>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ImageView android:id="@+id/iv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_launcher" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="start" android:text="开始" /> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.tweenanimation" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
练习2：frame动画，首先在res目录下新建drawable文件夹，然后在其下加入要用到的图片资源和资源xml文件
package comshellway.frameanimation; import android.support.v7.app.ActionBarActivity; import android.graphics.drawable.AnimationDrawable; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.ImageView; public class MainActivity extends ActionBarActivity { private AnimationDrawable ad; private ImageView iv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); iv = (ImageView) findViewById(R.id.iv); } //开始动画 public void start(View view){ //一般frame动画用来作背景用，在这里是得到背景动画 ad = (AnimationDrawable) iv.getBackground(); ad.start(); } //停止动画 public void stop(View view){ ad.stop(); } }
<?xml version="1.0" encoding="utf-8"?> <animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="true" > <item android:drawable="@drawable/a1" android:duration="200" /> <item android:drawable="@drawable/a2" android:duration="200" /> <item android:drawable="@drawable/a3" android:duration="200" /> <item android:drawable="@drawable/a4" android:duration="200" /> <item android:drawable="@drawable/a5" android:duration="200" /> <item android:drawable="@drawable/a6" android:duration="200" /> <item android:drawable="@drawable/a7" android:duration="200" /> <item android:drawable="@drawable/a8" android:duration="200" /> <item android:drawable="@drawable/a9" android:duration="200" /> <item android:drawable="@drawable/a10" android:duration="200" /> <item android:drawable="@drawable/a11" android:duration="200" /> <item android:drawable="@drawable/a12" android:duration="200" /> <item android:drawable="@drawable/a13" android:duration="200" /> <item android:drawable="@drawable/a14" android:duration="200" /> <item android:drawable="@drawable/a15" android:duration="200" /> </animation-list>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ImageView android:id="@+id/iv" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="@drawable/frame" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="start" android:text="开始" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="stop" android:text="停止" /> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="comshellway.frameanimation" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
运行结果截图：
十、传感器
练习：
package com.shellway.sensor; import android.support.v7.app.ActionBarActivity; import android.content.Context; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ImageView; public class MainActivity extends ActionBarActivity { private MySensorEventListener listener; private SensorManager sensorManager; private Sensor sensor; private ImageView iv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); iv = (ImageView) findViewById(R.id.iv); //获得传感器管理器 sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); //获得方向传感器 sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION); listener = new MySensorEventListener(); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); //注册sensor监听 sensorManager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_GAME); } private class MySensorEventListener implements SensorEventListener{ private float predegree = 0; @Override public void onSensorChanged(SensorEvent event) { // TODO Auto-generated method stub float x = event.values[SensorManager.DATA_X]; //创建一个旋转的动画，0.5f表示自身的正中间，Animation.RELATIVE_TO_SELF表示相对自身旋转 RotateAnimation rotate = new RotateAnimation(-predegree, x, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotate.setDuration(50); iv.startAnimation(rotate); predegree = x; } //精确度的改变，这里暂时不用管 public void onAccuracyChanged(Sensor sensor, int accuracy) { // TODO Auto-generated method stub } } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); //当应用在前台不活动的时候取消监听 sensorManager.unregisterListener(listener); } }
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.shellway.sensor.MainActivity" > <ImageView android:id="@+id/iv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/zn" /> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.shellway.sensor" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
运行结果截图：
十一：图片的移动和缩放
分析：
练习：
package com.shellway.dragscale; import android.support.v7.app.ActionBarActivity; import android.graphics.Matrix; import android.graphics.PointF; import android.os.Bundle; import android.util.FloatMath; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.ImageView; public class MainActivity extends ActionBarActivity { private ImageView iv; private MyOnTouchListener listener; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); listener = new MyOnTouchListener(); iv = (ImageView) findViewById(R.id.iv); iv.setOnTouchListener(listener); } private class MyOnTouchListener implements OnTouchListener{ private PointF startPiont = new PointF();//起始点 private Matrix mcurrentMatrix = new Matrix();//图片当前的matrix值 private Matrix mMatrix = new Matrix();//来一个临时的matrix private int type = 0; private final static int DRAG = 1; private final static int SCALE = 2; private PointF mstartP;//中心点 private float mdistance;//两点间的距离 @Override public boolean onTouch(View v, MotionEvent event) { int action = event.getAction()&MotionEvent.ACTION_MASK; switch (action) { case MotionEvent.ACTION_DOWN://当手指按下 float x = event.getX(); float y = event.getY(); startPiont.set(x, y);// mcurrentMatrix.set(iv.getImageMatrix());//图片还没有被拖动时候的位置 type = DRAG; break; case MotionEvent.ACTION_POINTER_1_DOWN://屏幕上已经有一根手指，再按下一根手指 mcurrentMatrix.set(iv.getImageMatrix());//图片还没有被缩放时候的大小 mstartP = getMidPoint(event);//得到移动前两个手指间的中心位置 mdistance = getMidDistance(event);//得到移动前两个手指间的距离 type = SCALE; break; case MotionEvent.ACTION_MOVE://当手指移动 if (type == DRAG) { mMatrix.set(mcurrentMatrix); float dx = event.getX() - startPiont.x; float dy = event.getY() - startPiont.y; mMatrix.postTranslate(dx, dy); }else if(type == SCALE){ mMatrix.set(mcurrentMatrix); float distance = getMidDistance(event);//得到移动后两个手指间的距离 float sx = distance/mdistance; mMatrix.postScale(sx, sx, mstartP.x, mstartP.y); } break; case MotionEvent.ACTION_UP://当手指弹起 case MotionEvent.ACTION_POINTER_1_UP://屏幕上弹起一根手指，还有一根手指 type = 0; break; default: break; } //给界面设置变动后的数据 iv.setImageMatrix(mMatrix); return true; } //计算中心点位置 public PointF getMidPoint(MotionEvent event){ float x = (event.getX(1) + event.getX(0))/2; float y = (event.getY(1) + event.getY(0))/2; return new PointF(x,y); } //计算两点间的距离 public float getMidDistance(MotionEvent event){ float dx = event.getX(1) - event.getX(0); float dy = event.getY(1) - event.getY(0); return FloatMath.sqrt((dx*dx) + (dy*dy)); } } }
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.shellway.dragscale.MainActivity" > <!--scaleType表示缩放类型， matrix表示图片的位置和大小 --> <ImageView android:id="@+id/iv" android:layout_width="fill_parent" android:layout_height="fill_parent" android:scaleType="matrix" android:src="@drawable/family" /> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.shellway.dragscale" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
运行结果截图：
