91视频专区

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MediaPlayer播放音频与视频2018-07-06 12:31·爱音乐的程序员小新人1.相关方法详解1）获得MediaPlayer实例：可以直接new或者调用create方法创建：MediaPlayer mp = new MediaPlayer();MediaPlayer mp = MediaPlayer.create(this, R.raw.test); //无需再调用setDataSource另外create还有这样的形式： create(Context context, Uri uri, SurfaceHolder holder) 通过Uri和指定 SurfaceHolder 【抽象类】创建一个多媒体播放器2）设置播放文件：//①raw下的资源：MediaPlayer.create(this, R.raw.test);//②本地文件路径：mp.setDataSource("/sdcard/test.mp3");//③网络URL文件：mp.setDataSource("http://www.xxx.com/music/test.mp3");另外setDataSource()方法有多个，里面有这样一个类型的参数：FileDescriptor，在使用这个 API的时候，需要把文件放到res文件夹平级的assets文件夹里，然后使用下述代码设置DataSource：AssetFileDescriptor fileDescriptor = getAssets().openFd("rain.mp3");m_mediaPlayer.setDataSource(fileDescriptor.getFileDescriptor(),fileDescriptor.getStartOffset(), fileDescriptor.getLength());3）其他方法getCurrentPosition( )：得到当前的播放位置getDuration() ：得到文件的时间getVideoHeight() ：得到视频高度getVideoWidth() ：得到视频宽度isLooping()：是否循环播放isPlaying()：是否正在播放pause()：暂停prepare()：准备(同步)prepareAsync()：准备(异步)release()：释放MediaPlayer对象reset()：重置MediaPlayer对象seekTo(int msec)：指定播放的位置（以毫秒为单位的时间）setAudioStreamType(int streamtype)：指定流媒体的类型setDisplay(SurfaceHolder sh)：设置用SurfaceHolder来显示多媒体setLooping(boolean looping)：设置是否循环播放setOnBufferingUpdateListener(MediaPlayer.OnBufferingUpdateListener listener)：网络流媒体的缓冲监听setOnCompletionListener(MediaPlayer.OnCompletionListener listener)：网络流媒体播放结束监听setOnErrorListener(MediaPlayer.OnErrorListener listener)：设置错误信息监听setOnVideoSizeChangedListener(MediaPlayer.OnVideoSizeChangedListener listener)：视频尺寸监听setScreenOnWhilePlaying(boolean screenOn)：设置是否使用SurfaceHolder显示setVolume(float leftVolume, float rightVolume)：设置音量start()：开始播放stop()：停止播放2.使用代码示例示例一：使用MediaPlayer播放音频：运行效果图：关键代码：public class MainActivity extends AppCompatActivity implements View.OnClickListener{ private Button btn_play; private Button btn_pause; private Button btn_stop; private MediaPlayer mPlayer = null; private boolean isRelease = true; //判断是否MediaPlayer是否释放的标志 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); bindViews(); } private void bindViews() { btn_play = (Button) findViewById(R.id.btn_play); btn_pause = (Button) findViewById(R.id.btn_pause); btn_stop = (Button) findViewById(R.id.btn_stop); btn_play.setOnClickListener(this); btn_pause.setOnClickListener(this); btn_stop.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()){ case R.id.btn_play: if(isRelease){ mPlayer = MediaPlayer.create(this,R.raw.fly); isRelease = false; } mPlayer.start(); //开始播放 btn_play.setEnabled(false); btn_pause.setEnabled(true); btn_stop.setEnabled(true); break; case R.id.btn_pause: mPlayer.pause(); //停止播放 btn_play.setEnabled(true); btn_pause.setEnabled(false); btn_stop.setEnabled(false); break; case R.id.btn_stop: mPlayer.reset(); //重置MediaPlayer mPlayer.release(); //释放MediaPlayer isRelease = true; btn_play.setEnabled(true); btn_pause.setEnabled(false); btn_stop.setEnabled(false); break; } }}注意事项：播放的是res/raw目录下的音频文件，创建MediaPlayer调用的是create方法，第一次启动播放前不需要再调用prepare()，如果是使用构造方法构造的话，则需要调用一次prepare()方法！另外贴下官方文档中，从其他两种途径播放音频的示例代码:本地Uri：Uri myUri = ....; // initialize Uri hereMediaPlayer mediaPlayer = new MediaPlayer();mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);mediaPlayer.setDataSource(getApplicationContext(), myUri);mediaPlayer.prepare();mediaPlayer.start();外部URL：String url = "http://........"; // your URL hereMediaPlayer mediaPlayer = new MediaPlayer();mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);mediaPlayer.setDataSource(url);mediaPlayer.prepare(); // might take long! (for buffering, etc)mediaPlayer.start();Note：假如你通过一个URL以流的形式播放在线音频文件，该文件必须可以进行渐进式下载示例二：使用MediaPlayer播放视频MediaPlayer主要用于播放音频，没有提供图像输出界面，所以我们需要借助其他的组件来显示MediaPlayer播放的图像输出，我们可以使用用SurfaceView 来显示，下面我们使用SurfaceView来写个视频播放的例子：运行效果图：实现代码：布局文件：activity_main.xml

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港(骋补苍驳)交(闯颈补辞)所(厂耻辞)文(奥别苍)件(闯颈补苍)显(齿颈补苍)示(厂丑颈)，巴(叠补)菲(贵别颈)特(罢别)旗(蚕颈)下(齿颈补)公(骋辞苍驳)司(厂颈)伯(叠辞)克(碍别)希(齿颈)尔(贰谤)哈(贬补)撒(厂补)韦(奥别颈)将(闯颈补苍驳)其(蚕颈)比(叠颈)亚(驰补)迪(顿颈)贬股(骋耻)的(顿别)持(颁丑颈)股(骋耻)比(叠颈)例(尝颈)从(颁辞苍驳)9.21%降(闯颈补苍驳)至(窜丑颈)8.98%。

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《人民日报》( 2024年07月17日 13 版)

发布于：叙永县

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