最近在学习视频播放的知识 ，记录下，全当笔记
本Demo采用原生 SurfaceView+MediaPlayer的方式，实现播放在线视频的功能。
先上界面
本Demo有四项基本功能，播放，停止，重播，停止。
1、布局结构
<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" android:orientation="vertical" 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=".MainActivity" > <EditText android:id="@+id/et_path" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="/sdcard/ykzzldx.mp4" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="wrap_content" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:id="@+id/btn_play" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:text="播放" /> <Button android:id="@+id/btn_pause" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:text="暂停" /> <Button android:id="@+id/btn_replay" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:text="重播" /> <Button android:id="@+id/btn_stop" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:text="停止" /> </LinearLayout> <SurfaceView android:id="@+id/sv" android:layout_width="fill_parent" android:layout_height="fill_parent" /> </LinearLayout>布局结构还是很简单的，4个按钮及一个SurfaceView
下面来看代码部分:
初始化而局:
private final String TAG = "MainActivity"; private EditText et_path; private SurfaceView sv; private Button btn_play, btn_pause, btn_replay, btn_stop; private MediaPlayer mediaPlayer; private SeekBar seekBar; private int currentPosition = 0; private boolean isPlaying; onCreate() seekBar = (SeekBar) findViewById(R.id.seekBar); sv = (SurfaceView) findViewById(R.id.sv); et_path = (EditText) findViewById(R.id.et_path); btn_play = (Button) findViewById(R.id.btn_play); btn_pause = (Button) findViewById(R.id.btn_pause); btn_replay = (Button) findViewById(R.id.btn_replay); btn_stop = (Button) findViewById(R.id.btn_stop); btn_play.setOnClickListener(click); btn_pause.setOnClickListener(click); btn_replay.setOnClickListener(click); btn_stop.setOnClickListener(click); // 为SurfaceHolder添加回调 sv.getHolder().addCallback(callback); // 4.0版本之下需要设置的属性 // 设置Surface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界面 // sv.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); // 为进度条添加进度更改事件 seekBar.setOnSeekBarChangeListener(change); callback private Callback callback = new Callback() { // SurfaceHolder被修改的时候回调 @Override public void surfaceDestroyed(SurfaceHolder holder) { Log.i(TAG, "SurfaceHolder 被销毁"); // 销毁SurfaceHolder的时候记录当前的播放位置并停止播放 if (mediaPlayer != null && mediaPlayer.isPlaying()) { currentPosition = mediaPlayer.getCurrentPosition(); mediaPlayer.stop(); } } @Override public void surfaceCreated(SurfaceHolder holder) { Log.i(TAG, "SurfaceHolder 被创建"); if (currentPosition > 0) { // 创建SurfaceHolder的时候，如果存在上次播放的位置，则按照上次播放位置进行播放 play(currentPosition); currentPosition = 0; } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { Log.i(TAG, "SurfaceHolder 大小被改变"); } };
change
private OnSeekBarChangeListener change = new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) { // 当进度条停止修改的时候触发 // 取得当前进度条的刻度 int progress = seekBar.getProgress(); if (mediaPlayer != null && mediaPlayer.isPlaying()) { // 设置当前播放的位置 mediaPlayer.seekTo(progress); } } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { } }; Click
private View.OnClickListener click = new View.OnClickListener() { @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_play: play(0); break; case R.id.btn_pause: pause(); break; case R.id.btn_replay: replay(); break; case R.id.btn_stop: stop(); break; default: break; } } };
开始播放：
protected void play(final int msec) { try { mediaPlayer = new MediaPlayer(); mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); mediaPlayer.setDisplay(sv.getHolder()); // 设置播放的视频源 mediaPlayer.setDataSource("http://112.253.22.157/17/z/z/y/u/zzyuasjwufnqerzvyxgkuigrkcatxr/hc.yinyuetai.com/D046015255134077DDB3ACA0D7E68D45.flv"); // 设置显示视频的SurfaceHolder Log.i(TAG, "开始装载"); mediaPlayer.prepareAsync(); mediaPlayer.setOnBufferingUpdateListener(new OnBufferingUpdateListener() { @Override public void onBufferingUpdate(MediaPlayer mp, int percent) { Log.i(TAG, "percent="+percent); } }); mediaPlayer.setOnPreparedListener(new OnPreparedListener() { @Override public void onPrepared(MediaPlayer mp) { Log.i(TAG, "装载完成"); mediaPlayer.start(); // 按照初始位置播放 mediaPlayer.seekTo(msec); // 设置进度条的最大进度为视频流的最大播放时长 seekBar.setMax(mediaPlayer.getDuration()); // 开始线程，更新进度条的刻度 new Thread() { @Override public void run() { try { isPlaying = true; while (isPlaying) { int current = mediaPlayer .getCurrentPosition(); seekBar.setProgress(current); sleep(500); } } catch (Exception e) { e.printStackTrace(); } } }.start(); btn_play.setEnabled(false); } }); mediaPlayer.setOnCompletionListener(new OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { // 在播放完毕被回调 btn_play.setEnabled(true); } }); mediaPlayer.setOnErrorListener(new OnErrorListener() { @Override public boolean onError(MediaPlayer mp, int what, int extra) { // 发生错误重新播放 play(0); isPlaying = false; return false; } }); } catch (Exception e) { e.printStackTrace(); } } 暂停、继续 protected void pause() { if (btn_pause.getText().toString().trim().equals("继续")) { btn_pause.setText("暂停"); mediaPlayer.start(); Toast.makeText(this, "继续播放", 0).show(); return; } if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.pause(); btn_pause.setText("继续"); Toast.makeText(this, "暂停播放", 0).show(); } } 重新播放 protected void replay() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.seekTo(0); Toast.makeText(this, "重新播放", 0).show(); btn_pause.setText("暂停"); return; } isPlaying = false; play(0); } 停止播放 protected void stop() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.stop(); mediaPlayer.release(); mediaPlayer = null; btn_play.setEnabled(true); isPlaying = false; } } 代码还是很简单的，有兴趣的童鞋可以亲自试一下。
