常用控件（三）
进度条和抠图以及获取手机内存卡的图片
先写3个xml文件
1.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="<"
android:onClick="before"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
android:onClick="add"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:onClick="delete"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=">"
android:onClick="next"
/>
LinearLayout>
<ImageView
android:layout_width="300dp"
android:layout_height="400dp"
android:id="@+id/iv_girl_image"
android:background="#ffff00"
/>
<ImageView
android:layout_width="60dp"
android:layout_height="60dp"
android:id="@+id/iv_girl_new"
/>
LinearLayout>2.
<LinearLayout 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"
tools:context="com.zking.g160618_android06_widget.MainActivity">
<ImageView
android:layout_width="60dp"
android:layout_height="60dp"
android:background="#00ff00"
android:scaleType="centerInside"
android:src="@drawable/largeimage"
/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/largeimage"
/>
LinearLayout>
3.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ProgressBar
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/progressBar"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_progress_num"
android:textSize="30sp"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="start"
android:text="开始"
/>
LinearLayout>下面是java代码
首先是抠图，就是图片局部放大
package com.zking.g160618_android06_widget;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.File;
/**
* @author Zking-Snail
* @time 2017/6/9 11:40
* @Version ${REV}
*/
public class GirlActivity extends AppCompatActivity{
//定义图片数组
private int images[]={R.drawable.s1,R.drawable.s2,R.drawable.s3,R.drawable.s4,R.drawable.s5};
private ImageView iv_girl_image;
private int currentIndex=0;
private int currentAlpha=255;
private File[] files;
private ImageView iv_girl_new;
private Bitmap bitmap;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_girl);
iv_girl_image = (ImageView) findViewById(R.id.iv_girl_image);
iv_girl_new = (ImageView) findViewById(R.id.iv_girl_new);
//获取手机内存卡中的图片
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
//获取内存卡的路径
String sdcardPath=Environment.getExternalStorageDirectory().getAbsolutePath();
File file=new File(sdcardPath+"/images");
files = file.listFiles();
}
//通过代码指定第一张默认图片
//iv_girl_image.setImageResource(images[currentIndex]);
bitmap = BitmapFactory.decodeFile(files[currentIndex].getAbsolutePath());
iv_girl_image.setImageBitmap(bitmap);
//设置透明度
iv_girl_image.setImageAlpha(currentAlpha);
//给ImageView设置触摸事件
iv_girl_image.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
//获取手指的坐标
float x=motionEvent.getX();
float y=motionEvent.getY();
//抠图
Bitmap newBitmap=Bitmap.createBitmap(bitmap,(int)x,(int)y,30,30);
iv_girl_new.setImageBitmap(newBitmap);
return true;
}
});
}
public void before(View view){
currentIndex--;
//Log.i("test","当前值："+currentIndex);
if(currentIndex<0){
currentIndex=0;
Toast.makeText(GirlActivity.this, "兄弟,乖乖充会员吧！", Toast.LENGTH_SHORT).show();
}
//iv_girl_image.setImageResource(images[currentIndex]);
bitmap=BitmapFactory.decodeFile(files[currentIndex].getAbsolutePath());
iv_girl_image.setImageBitmap(bitmap);
}
public void next(View view){
currentIndex++;
//Log.i("test","当前值："+currentIndex);
if(currentIndex>=files.length){
currentIndex=files.length-1;
Toast.makeText(GirlActivity.this, "兄弟,请冲会员,查看更多", Toast.LENGTH_SHORT).show();
}
//iv_girl_image.setImageResource(images[currentIndex]);
bitmap=BitmapFactory.decodeFile(files[currentIndex].getAbsolutePath());
iv_girl_image.setImageBitmap(bitmap);
}
public void add(View view){
currentAlpha+=20;
if(currentAlpha>255){
currentAlpha=255;
Toast.makeText(GirlActivity.this, "兄弟，很高清了", Toast.LENGTH_SHORT).show();
}
iv_girl_image.setImageAlpha(currentAlpha);
}
public void delete(View view){
currentAlpha-=20;
if(currentAlpha<0){
currentAlpha=0;
Toast.makeText(GirlActivity.this, "兄弟，没得看了", Toast.LENGTH_SHORT).show();
}
iv_girl_image.setImageAlpha(currentAlpha);
}
}
获取手机内存卡的路径还需要在 AndroidManifest.xml写代码
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.a_02.a_06">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE">uses-permission>
<application android:allowBackup="true" android:icon="@mipmap/ic_launcher"
android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true" android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
activity>
<activity android:name=".test">
activity>
<activity android:name=".work">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
intent-filter>
activity>
application>
manifest>然后到进度条了
package com.zking.g160618_android06_widget;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;
/**
* @author Zking-Snail
* @time 2017/6/11 11:11
* @Version ${REV}
*/
public class ProgressActivity extends AppCompatActivity {
private ProgressBar progressBar;
private TextView tv_progress_num;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_progress);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
tv_progress_num = (TextView) findViewById(R.id.tv_progress_num);
}
//ANR ：application not responsing应用程序无响应
//why：因为在主线程中执行了 耗时的操作
//how:把耗时的操作 写到子线程中
public void start(View view){
new MyThread().start();
}
Handler handler=new Handler(){
//接受消息，并更新UI
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
//接受消息
int i=msg.what;
// 更新UI
tv_progress_num.setText(i+"%");
}
};
class MyThread extends Thread{
@Override
public void run() {
super.run();
for (int i = 0; i <=100 ; i++) {
progressBar.setProgress(i);
//发消息
handler.sendEmptyMessage(i);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
这里要
注意耗时的事件不要写道主线程中，会导致程序无响应