Android之SurfaceView实现视频播放
1.案例一
布局文件：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:weightSum="1"> <SurfaceView android:layout_height="220dip" android:layout_gravity="center" android:id="@+id/surface" android:layout_weight="0.25" android:layout_width="320dip"></SurfaceView> <LinearLayout android:id="@+id/linearLayout1" android:layout_height="wrap_content" android:layout_width="fill_parent"> <Button android:text="播放" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:text="暂停" android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:text="停止" android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> </LinearLayout> </LinearLayout>
主程序：
public class SurfaceActivity extends Activity implements SurfaceHolder.Callback { /** Called when the activity is first created. */ MediaPlayer player; SurfaceView surface; SurfaceHolder surfaceHolder; Button play,pause,stop; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); play=(Button)findViewById(R.id.button1); pause=(Button)findViewById(R.id.button2); stop=(Button)findViewById(R.id.button3); surface=(SurfaceView)findViewById(R.id.surface); surfaceHolder=surface.getHolder(); //SurfaceHolder是SurfaceView的控制接口 surfaceHolder.addCallback(this); //因为这个类实现了SurfaceHolder.Callback接口，所以回调参数直接this surfaceHolder.setFixedSize(320, 220); //显示的分辨率,不设置为视频默认 surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); //Surface类型 play.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { player.start(); }}); pause.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { player.pause(); }}); stop.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { player.stop(); }}); } @Override public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) { } @Override public void surfaceCreated(SurfaceHolder arg0) { //必须在surface创建后才能初始化MediaPlayer,否则不会显示图像 player=new MediaPlayer(); player.setAudioStreamType(AudioManager.STREAM_MUSIC); player.setDisplay(surfaceHolder); //设置显示视频显示在SurfaceView上 try { player.setDataSource("/sdcard/3.mp4"); player.prepare(); } catch (Exception e) { e.printStackTrace(); } } @Override public void surfaceDestroyed(SurfaceHolder arg0) { // TODO Auto-generated method stub } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); if(player.isPlaying()){ player.stop(); } player.release(); //Activity销毁时停止播放，释放资源。不做这个操作，即使退出还是能听到视频播放的声音 } }
2.案例二
布局文件main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ffffff" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/filename" /> <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="oppo.mp4" android:id="@+id/filename" /> <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" > <ImageButton android:layout_width="wrap_content" android:layout_height="fill_parent" android:src="@drawable/play" android:id="@+id/play" /> <ImageButton android:layout_width="wrap_content" android:layout_height="fill_parent" android:src="@drawable/pause" android:id="@+id/pause" /> <ImageButton android:layout_width="wrap_content" android:layout_height="fill_parent" android:src="@drawable/stop" android:id="@+id/stop" /> <ImageButton android:layout_width="wrap_content" android:layout_height="fill_parent" android:src="@drawable/reset" android:id="@+id/reset" /> </LinearLayout> <SurfaceView android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/surfaceview" /> </LinearLayout>
主程序VodeoPlayActivity.java
public class VodeoPlayActivity extends Activity { /** Called when the activity is first created. */ private EditText filenamEditText; private MediaPlayer mediaPlayer; private String filename; private SurfaceView surfaceView; private final static String TAG="VodeoPlayActivity"; private int prosition=0; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); filenamEditText=(EditText) this.findViewById(R.id.filename); surfaceView=(SurfaceView)this.findViewById(R.id.surfaceview); surfaceView.getHolder().setFixedSize(176, 144);//设置分辨率 surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//设置surfaceview不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前 surfaceView.getHolder().addCallback(new SurceCallBack());//对surface对象的状态进行监听 mediaPlayer=new MediaPlayer(); ButtonOnClikListiner buttonOnClikListinero=new ButtonOnClikListiner(); ImageButton start=(ImageButton) this.findViewById(R.id.play); ImageButton pause=(ImageButton) this.findViewById(R.id.pause); ImageButton stop=(ImageButton) this.findViewById(R.id.stop); ImageButton replay=(ImageButton) this.findViewById(R.id.reset); start.setOnClickListener(buttonOnClikListinero); pause.setOnClickListener(buttonOnClikListinero); stop.setOnClickListener(buttonOnClikListinero); replay.setOnClickListener(buttonOnClikListinero); } private final class ButtonOnClikListiner implements View.OnClickListener{ @Override public void onClick(View v) { if(Environment.getExternalStorageState()==Environment.MEDIA_UNMOUNTED){ Toast.makeText(VodeoPlayActivity.this, "sd卡不存在", Toast.LENGTH_SHORT).show(); return; } filename=filenamEditText.getText().toString(); switch (v.getId()) { case R.id.play: play(); break; case R.id.pause: if(mediaPlayer.isPlaying()){ mediaPlayer.pause(); }else{ mediaPlayer.start(); } break; case R.id.reset: if(mediaPlayer.isPlaying()){ mediaPlayer.seekTo(0); }else{ play(); } break; case R.id.stop: if(mediaPlayer.isPlaying()){ mediaPlayer.stop(); } break; } } } private void play() { try { File file=new File(Environment.getExternalStorageDirectory(),filename); mediaPlayer.reset();//重置为初始状态 mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);//设置音乐流的类型 mediaPlayer.setDisplay(surfaceView.getHolder());//设置video影片以surfaceviewholder播放 mediaPlayer.setDataSource(file.getAbsolutePath());//设置路径 mediaPlayer.prepare();//缓冲 mediaPlayer.start();//播放 } catch (Exception e) { Log.e(TAG, e.toString()); e.printStackTrace(); } } private final class SurceCallBack implements SurfaceHolder.Callback{ /** * 画面修改 */ @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } /** * 画面创建 */ @Override public void surfaceCreated(SurfaceHolder holder) { if(prosition>0&&filename!=null){ play(); mediaPlayer.seekTo(prosition); prosition=0; } } /** * 画面销毁 */ @Override public void surfaceDestroyed(SurfaceHolder holder) { if(mediaPlayer.isPlaying()){ prosition=mediaPlayer.getCurrentPosition(); mediaPlayer.stop(); } } } }
