扣丁学堂笔记第20天动画与图形
1.补间动画（Tween）与帧动画（Frame）
在res下新建一个anim文件夹，自定义四种动画的xml文件
alph_anim.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<alpha android:fromAlpha="0.0"
android:toAlpha="1.0"
android:duration="3000"></alpha>
</set>
scale_anim
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<scale
android:duration="3000"
android:fillEnabled="false"
android:fromXScale="0.0"
android:fromYScale="0.0"
android:toXScale="1.0"
android:toYScale="1.0"
android:pivotX="50%"
android:pivotY="50%" >
</scale>
</set>
translate_anim
'
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="3000"
android:fromXDelta="0.0"
android:fromYDelta="0.0"
android:toXDelta="300"
android:toYDelta="300">
</translate>
</set>
rotate_anim
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<rotate
android:duration="3000"
android:fromDegrees="0"
android:toDegrees="360"
android:pivotX="50%"
android:pivotY="50%">
</rotate>
</set>
activity_main
<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.example.animationtest.MainActivity" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/c"
android:onClick="click"/>
</RelativeLayout>
MainActivity
package com.example.animationtest;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void click(View view){
ImageView iv = (ImageView) view;
Animation rotateAnimation = AnimationUtils.loadAnimation(this, R.anim.rotate_anim);
iv.startAnimation(rotateAnimation);
}
}
2.属性动画
ObjectAnimator与ValueAnimator
ValueAnimator代码
activity_main
<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" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="@drawable/icon"
android:onClick="valueAnimatonClick" />
</RelativeLayout>
MainActivity
package com.example.valueanimationtest;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.app.Activity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void valueAnimatonClick(View view) {
final View v = view;
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
// 定义一个动画
ValueAnimator va = ValueAnimator.ofFloat(view.getX(), dm.heightPixels,
view.getY()).setDuration(500);
// 监听动画的每个事件
va.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
// TODO Auto-generated method stub
v.setTranslationY((Float) animation.getAnimatedValue());
}
});
va.start();
}
}
监听动画事件与AnimatorSet
插值器与XML配置动画
动画菜单案例
详见：http://blog.csdn.net/dt235201314/article/details/50534899
3.画布与绘制
几何图形与位图绘制
SurfaceView
SurfaceView播放视频案例
MainActivity
package com.example.videotest;
import java.io.IOException;
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
public class MainActivity extends Activity implements SurfaceHolder.Callback {
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private MediaPlayer mediaPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
surfaceView = (SurfaceView) findViewById(R.id.surfaceView1);
surfaceHolder = surfaceView.getHolder();// surfaceHolder是surfaceView的控制接口
surfaceHolder.addCallback(this);
surfaceHolder.setFixedSize(320, 220);//设置视频分辨率
}
public void playClick(View view) {
mediaPlayer.start();
}
public void pauseClick(View view) {
mediaPlayer.pause();
}
public void stopClick(View view) {
mediaPlayer.stop();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDisplay(surfaceHolder);
String path = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES)
+ "/mymovie.mp4";
try {
mediaPlayer.setDataSource(path);
mediaPlayer.prepare();
} catch (IOException 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
if(mediaPlayer!=null){
if(mediaPlayer.isPlaying()){
mediaPlayer.stop();
mediaPlayer.release();
}
}
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
if(mediaPlayer!=null){
if(mediaPlayer.isPlaying()){
mediaPlayer.stop();
mediaPlayer.release();
}
}
}
}
activtiy_main
<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" >
<SurfaceView
android:id="@+id/surfaceView1"
android:layout_width="wrap_content"
android:layout_height="250dp"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/surfaceView1"
android:layout_centerHorizontal="true"
android:onClick="playClick"
android:text="播放" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button1"
android:layout_alignBottom="@+id/button1"
android:layout_toLeftOf="@+id/button1"
android:onClick="pauseClick"
android:text="暂停" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button1"
android:layout_alignBottom="@+id/button1"
android:layout_toRightOf="@+id/button1"
android:onClick="stopClick"
android:text="停止" />
</RelativeLayout>
draw9patch
