标签：android videoview buffering android-videoview
我有兴趣在VideoView B播放时能够“预缓冲”VideoView A.这可能吗？
>我有两个VideoView实例.
>在给定时间只会显示一个VideoView,占据手机的整个屏幕.
>目的是在从VideoView A和VideoView B切换时减少“黑屏”.
>该应用程序一个接一个地播放视频列表.
在2015年1月19日添加了以下代码
下面的代码抓取每个玩家的MediaPlayer的引用.当MediaPlayer A开始渲染时,MediaPlayer B将调用stop(),release(),setDataSource(url),prepareAsync().当MediaPlayer A完成时,Media Player B将调用start().
public class PrebufferingActivity extends Activity {
private VideoView player1;
private VideoView player2;
private MediaPlayer mediaPlayer1;
private MediaPlayer mediaPlayer2;
public static final String URL_1 = "sample1.mp4";
public static final String URL_2 = "sample2.mp4";
public boolean FIRST_TIME = true;
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_prebuffering);
player1 = (VideoView) findViewById(R.id.videoPlayer1);
player2 = (VideoView) findViewById(R.id.videoPlayer2);
player1.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return false;
}
});
player2.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return false;
}
});
player1.setOnCompletionListener(new OnCompletionListener(){
@Override
public void onCompletion(MediaPlayer mp) {
mediaPlayer2.start();
// Toggle visibility. Player1 is completed. Hide Player1. Show Player2.
player2.setVisibility(View.VISIBLE);
player1.setVisibility(View.INVISIBLE);
}
});
player1.setOnInfoListener(new OnInfoListener(){
@Override
public boolean onInfo(MediaPlayer mp, int what, int extra)
{
if(what == MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START)
{
mediaPlayer2.stop();
mediaPlayer2.release();
try {
mediaPlayer2.setDataSource(URL_2);
mediaPlayer2.prepareAsync();
} catch (Exception e) {
e.printStackTrace();
}
}
return false;
}
});
player1.setOnPreparedListener(new OnPreparedListener(){
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer1 = mp;
if(FIRST_TIME == true) {
mediaPlayer1.start();
player1.requestFocus();
FIRST_TIME = false;
}
}
});
player2.setOnCompletionListener(new OnCompletionListener(){
@Override
public void onCompletion(MediaPlayer mp) {
mediaPlayer1.start();
player1.requestFocus();
// Toggle visibility. Player2 is completed. Hide Player2. Show Player1.
player1.setVisibility(View.VISIBLE);
player2.setVisibility(View.INVISIBLE);
}
});
player2.setOnInfoListener(new OnInfoListener(){
@Override
public boolean onInfo(MediaPlayer mp, int what, int extra)
{
if(what == MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START)
{
// Prepare Player 2
mediaPlayer1.stop();
mediaPlayer1.release();
try {
mediaPlayer1.setDataSource(PrebufferingActivity.URL_1);
mediaPlayer1.prepareAsync();
} catch (Exception e) {
e.printStackTrace();
}
}
return false;
}
});
player2.setOnPreparedListener(new OnPreparedListener(){
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer2 = mp;
}
});
// Player 1
player1.setMediaController(new MediaController(this));
player1.setVideoURI(Uri.parse(URL_1));
// Player 2
player2.setMediaController(new MediaController(this));
player2.setVideoURI(Uri.parse(URL_2));
}
解决方法:
假设您使用MediaPlayer在VideoView中处理视频的播放,您可以使用prepareAsync()方法来实现这一点. prepareAsync()方法基本上执行与prepare()相同的功能,该功能用于缓冲和准备视频,但它可以在后台异步完成.
编辑
我做了类似的事情,但实际上我使用的是SurfaceView.要处理另一个流,只需创建另一个MediaPlayer实例.以下示例将创建两个MediaPlayer实例并缓冲第一个视频.在准备好第一个视频后,第二个视频将被异步缓冲.然后将第一个MediaPlayer绑定到SurfaceView,并启动第一个视频.当第一个视频播放完毕后,将释放相应的MediaPlayer实例,附加辅助实例,并自动启动第二个视频.以下示例代码已经过测试并且工作正常：
public class StreamingActivity extends Activity implements SurfaceHolder.Callback, MediaPlayer.OnPreparedListener, MediaPlayer.OnCompletionListener
{
MediaPlayer mediaPlayerPrimary;
MediaPlayer mediaPlayerSecondary;
SurfaceHolder surfaceHolder;
SurfaceView surfaceView;
String videoSourcePrimary = "videoSourcePrimaryURL";
String videoSourceSecondary = "videoSourceSecondaryURL";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.streaming_activity_layout);
/** Create SurfaceView */
surfaceView = (SurfaceView) findViewById(R.id.surface_view);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
}
@Override
public void surfaceCreated(SurfaceHolder arg0)
{
try
{
/** Create MediaPlayer(s) */
mediaPlayerPrimary = new MediaPlayer();
mediaPlayerSecondary = new MediaPlayer();
/** Attach primary MediaPlayer to SurfaceView */
mediaPlayerPrimary.setDisplay(surfaceHolder);
/** Set sources */
mediaPlayerPrimary.setDataSource(videoSourcePrimary);
mediaPlayerSecondary.setDataSource(videoSourceSecondary);
/** Prepare MediaPlayer(s) */
mediaPlayerPrimary.prepare();
mediaPlayerSecondary.prepareAsync();
/** Set listeners */
mediaPlayerPrimary.setOnPreparedListener(this);
mediaPlayerPrimary.setOnCompletionListener(this);
mediaPlayerSecondary.setOnPreparedListener(this);
mediaPlayerSecondary.setOnCompletionListener(this);
/** Set audio stream type */
mediaPlayerPrimary.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayerSecondary.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
catch (Exception e)
{
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3)
{
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0)
{
}
@Override
public void onPrepared(MediaPlayer mp)
{
if (mp == mediaPlayerPrimary)
{
/** First video ready, start playback */
mediaPlayerPrimary.start();
}
else if (mp == mediaPlayerSecondary)
{
/** Second video is ready */
}
}
@Override
public void onCompletion(MediaPlayer mp)
{
/** First video is completed, start second video */
mediaPlayerPrimary.release();
mediaPlayerSecondary.setDisplay(surfaceHolder);
mediaPlayerSecondary.start();
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.streaming_activity_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
}
标签：android,videoview,buffering,android-videoview 来源： https://codeday.me/bug/20190628/1318860.html
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