Android提高之MediaPlayer播放网络视频的实现方法

2020-04-11 11:45:34

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前面讲解了MediaPlayer播放网络音频，主要介绍了MediaPlayer关于网络音频的缓冲和进度条控制的方法，本文再来讲解一下MediaPlayer播放网络视频的方法。播放网络视频比播放网络音频需要多一个SurfaceView而已，在已经熟悉了MediaPlayer播放网络音频之后，相信大家对本文所述的播放网络视频也能很快地掌握。

先来看看本文程序运行截图，如下所示：

本文程序的视频来自http://daily3gp.com，大家可以替换程序中的视频链接，试试其他影片。

main.xml的源码如下：

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="fill_parent" android:layout_width="fill_parent"> <SurfaceView android:id="@+id/surfaceView1" android:layout_height="fill_parent" android:layout_width="fill_parent"></SurfaceView> <LinearLayout android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_gravity="bottom" android:orientation="vertical"> <LinearLayout android:orientation="horizontal"  android:layout_gravity="center_horizontal" android:layout_marginTop="4.0dip"  android:layout_height="wrap_content" android:layout_width="wrap_content">  <Button android:layout_width="wrap_content"  android:layout_height="wrap_content" android:id="@+id/btnPlayUrl"  android:text="播放网络视频"></Button>  <Button android:layout_height="wrap_content" android:id="@+id/btnPause"  android:text="暂停" android:layout_width="80dip"></Button>  <Button android:layout_height="wrap_content"  android:layout_width="80dip" android:text="停止" android:id="@+id/btnStop"></Button> </LinearLayout> <LinearLayout android:orientation="horizontal"  android:layout_width="fill_parent" android:layout_height="wrap_content"  android:layout_marginBottom="20dip">  <SeekBar android:paddingRight="10dip" android:layout_gravity="center_vertical"  android:paddingLeft="10dip" android:layout_weight="1.0"  android:layout_height="wrap_content" android:layout_width="wrap_content"  android:id="@+id/skbProgress" android:max="100"></SeekBar> </LinearLayout> </LinearLayout></FrameLayout>

Player.java是本文的核心，Player.java实现了“进度条更新”、“数据缓冲”、“SurfaceHolder生命周期”等功能，其中“SurfaceHolder生命周期”是视频与音频播放的最大区别，通过surfaceCreated()、surfaceDestroyed()、surfaceChanged()可以创建/释放某些资源。下面这个地方需要注意一下：

videoWidth = mediaPlayer.getVideoWidth();videoHeight = mediaPlayer.getVideoHeight();if (videoHeight != 0 && videoWidth != 0) { arg0.start();}

有些视频是android播放器不能播放的，不能播放时videoHeight=0，videoWidth=0，以此来判断是否播放视频。

Player.java源码如下：

package com.videoplayer;import java.io.IOException;import java.util.Timer;import java.util.TimerTask;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnBufferingUpdateListener;import android.media.MediaPlayer.OnCompletionListener;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.widget.SeekBar;public class Player implements OnBufferingUpdateListener, OnCompletionListener, MediaPlayer.OnPreparedListener, SurfaceHolder.Callback { private int videoWidth; private int videoHeight; public MediaPlayer mediaPlayer; private SurfaceHolder surfaceHolder; private SeekBar skbProgress; private Timer mTimer=new Timer(); public Player(SurfaceView surfaceView,SeekBar skbProgress) { this.skbProgress=skbProgress; surfaceHolder=surfaceView.getHolder(); surfaceHolder.addCallback(this); surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); mTimer.schedule(mTimerTask, 0, 1000); } /******************************************************* * 通过定时器和Handler来更新进度条 ******************************************************/ TimerTask mTimerTask = new TimerTask() { @Override public void run() {  if(mediaPlayer==null)  return;  if (mediaPlayer.isPlaying() && skbProgress.isPressed() == false) {  handleProgress.sendEmptyMessage(0);  } } }; Handler handleProgress = new Handler() { public void handleMessage(Message msg) {  int position = mediaPlayer.getCurrentPosition();  int duration = mediaPlayer.getDuration();    if (duration > 0) {  long pos = skbProgress.getMax() * position / duration;  skbProgress.setProgress((int) pos);  } }; }; //***************************************************** public void play() { mediaPlayer.start(); } public void playUrl(String videoUrl) { try {  mediaPlayer.reset();  mediaPlayer.setDataSource(videoUrl);  mediaPlayer.prepare();//prepare之后自动播放  //mediaPlayer.start(); } catch (IllegalArgumentException e) {  // TODO Auto-generated catch block  e.printStackTrace(); } catch (IllegalStateException e) {  // TODO Auto-generated catch block  e.printStackTrace(); } catch (IOException e) {  // TODO Auto-generated catch block  e.printStackTrace(); } } public void pause() { mediaPlayer.pause(); } public void stop() { if (mediaPlayer != null) {   mediaPlayer.stop();      mediaPlayer.release();       mediaPlayer = null;     }  } @Override public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) { Log.e("mediaPlayer", "surface changed"); } @Override public void surfaceCreated(SurfaceHolder arg0) { try {  mediaPlayer = new MediaPlayer();  mediaPlayer.setDisplay(surfaceHolder);  mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);  mediaPlayer.setOnBufferingUpdateListener(this);  mediaPlayer.setOnPreparedListener(this); } catch (Exception e) {  Log.e("mediaPlayer", "error", e); } Log.e("mediaPlayer", "surface created"); } @Override public void surfaceDestroyed(SurfaceHolder arg0) { Log.e("mediaPlayer", "surface destroyed"); } @Override /** * 通过onPrepared播放 */ public void onPrepared(MediaPlayer arg0) { videoWidth = mediaPlayer.getVideoWidth(); videoHeight = mediaPlayer.getVideoHeight(); if (videoHeight != 0 && videoWidth != 0) {  arg0.start(); } Log.e("mediaPlayer", "onPrepared"); } @Override public void onCompletion(MediaPlayer arg0) { // TODO Auto-generated method stub } @Override public void onBufferingUpdate(MediaPlayer arg0, int bufferingProgress) { skbProgress.setSecondaryProgress(bufferingProgress); int currentProgress=skbProgress.getMax()*mediaPlayer.getCurrentPosition()/mediaPlayer.getDuration(); Log.e(currentProgress+"% play", bufferingProgress + "% buffer"); }}

test_videoplayer.java是主程序，负责调用Player类，其中关键部分是SeekBarChangeEvent这个SeekBar拖动的事件：SeekBar的Progress是0~SeekBar.getMax()之内的数，而MediaPlayer.seekTo()的参数是0~MediaPlayer.getDuration()之内数，所以MediaPlayer.seekTo()的参数是(progress/seekBar.getMax())*MediaPlayer.getDuration()。

test_videoplayer.java源码如下：

package com.videoplayer;import android.app.Activity;import android.content.pm.ActivityInfo;import android.net.Uri;import android.os.Bundle;import android.util.Log;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.SeekBar;public class test_videoplayer extends Activity { private SurfaceView surfaceView; private Button btnPause, btnPlayUrl, btnStop; private SeekBar skbProgress; private Player player; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView1); btnPlayUrl = (Button) this.findViewById(R.id.btnPlayUrl); btnPlayUrl.setOnClickListener(new ClickEvent()); btnPause = (Button) this.findViewById(R.id.btnPause); btnPause.setOnClickListener(new ClickEvent()); btnStop = (Button) this.findViewById(R.id.btnStop); btnStop.setOnClickListener(new ClickEvent()); skbProgress = (SeekBar) this.findViewById(R.id.skbProgress); skbProgress.setOnSeekBarChangeListener(new SeekBarChangeEvent()); player = new Player(surfaceView, skbProgress); } class ClickEvent implements OnClickListener { @Override public void onClick(View arg0) {  if (arg0 == btnPause) {  player.pause();  } else if (arg0 == btnPlayUrl) {  String url="http://daily3gp.com/vids/family_guy_penis_car.3gp";  player.playUrl(url);  } else if (arg0 == btnStop) {  player.stop();  } } } class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener { int progress; @Override public void onProgressChanged(SeekBar seekBar, int progress,  boolean fromUser) {  // 原本是(progress/seekBar.getMax())*player.mediaPlayer.getDuration()  this.progress = progress * player.mediaPlayer.getDuration()   / seekBar.getMax(); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) {  // seekTo()的参数是相对与影片时间的数字，而不是与seekBar.getMax()相对的数字  player.mediaPlayer.seekTo(progress); } }}

感兴趣的读者可以自己动手测试一下本文实例代码，相信对大家进行Android程序开发有一定的借鉴作用。

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