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MediaPlayer开发全解析
本文介绍MediaPlayer的使用。MediaPlayer可以播放音频和视频,另外也可以通过VideoView来播放视频,虽然VideoView比MediaPlayer简单易用,但定制性不如用MediaPlayer,要视情况选择了。MediaPlayer播放音频比较简单,但是要播放视频就需要SurfaceView。SurfaceView比普通的自定义View更有绘图上的优势,它支持完全的OpenGL ES库。
先贴出本文程序运行结果的截图,上面是播放/停止音频,可用SeekBar来调进度,下面是播放/停止视频,也是用SeekBar来调进度:
main.xml的源码:
XML/HTML代码
- <linearlayout android:id="@+id/LinearLayout01"
- android:layout_width="fill_parent" android:layout_height="fill_parent"
- xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical">
- <seekbar android:id="@+id/SeekBar01" android:layout_height="wrap_content"
- android:layout_width="fill_parent">
- <linearlayout android:id="@+id/LinearLayout02"
- android:layout_width="wrap_content" android:layout_height="wrap_content">
- <button android:id="@+id/Button01" android:layout_width="wrap_content"
- android:layout_height="wrap_content" android:text="播放音频">
- <button android:id="@+id/Button02" android:layout_width="wrap_content"
- android:layout_height="wrap_content" android:text="停止播放">
- <seekbar android:id="@+id/SeekBar02" android:layout_height="wrap_content"
- android:layout_width="fill_parent">
- <surfaceview android:id="@+id/SurfaceView01"
- android:layout_width="fill_parent" android:layout_height="250px">
- <linearlayout android:id="@+id/LinearLayout02"
- android:layout_width="wrap_content" android:layout_height="wrap_content">
- <button android:layout_width="wrap_content"
- android:layout_height="wrap_content" android:id="@+id/Button03"
- android:text="播放视频">
- <button android:layout_width="wrap_content"
- android:layout_height="wrap_content" android:text="停止播放" android:id="@+id/Button04">
本文程序的源码,有点长:
Java代码
- package com.testMedia;
- import java.io.IOException;
- import java.util.Timer;
- import java.util.TimerTask;
- import android.app.Activity;
- import android.media.AudioManager;
- import android.media.MediaPlayer;
- import android.os.Bundle;
- import android.view.SurfaceHolder;
- import android.view.SurfaceView;
- import android.view.View;
- import android.widget.Button;
- import android.widget.SeekBar;
- import android.widget.Toast;
- public class testMedia extends Activity {
- /** Called when the activity is first created. */
- private SeekBar skb_audio=null;
- private Button btn_start_audio = null;
- private Button btn_stop_audio = null;
- private SeekBar skb_video=null;
- private Button btn_start_video = null;
- private Button btn_stop_video = null;
- private SurfaceView surfaceView;
- private SurfaceHolder surfaceHolder;
- private MediaPlayer m = null;
- private Timer mTimer;
- private TimerTask mTimerTask;
- private boolean isChanging=false;//互斥变量,防止定时器与SeekBar拖动时进度冲突
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- //----------Media控件设置---------//
- m=new MediaPlayer();
- //播放结束之后弹出提示
- m.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){
- @Override
- public void onCompletion(MediaPlayer arg0) {
- Toast.makeText(testMedia.this, "结束", 1000).show();
- m.release();
- }
- });
- //----------定时器记录播放进度---------//
- mTimer = new Timer();
- mTimerTask = new TimerTask() {
- @Override
- public void run() {
- if(isChanging==true)
- return;
- if(m.getVideoHeight()==0)
- skb_audio.setProgress(m.getCurrentPosition());
- else
- skb_video.setProgress(m.getCurrentPosition());
- }
- };
- mTimer.schedule(mTimerTask, 0, 10);
- btn_start_audio = (Button) this.findViewById(R.id.Button01);
- btn_stop_audio = (Button) this.findViewById(R.id.Button02);
- btn_start_audio.setOnClickListener(new ClickEvent());
- btn_stop_audio.setOnClickListener(new ClickEvent());
- skb_audio=(SeekBar)this.findViewById(R.id.SeekBar01);
- skb_audio.setOnSeekBarChangeListener(new SeekBarChangeEvent());
- btn_start_video = (Button) this.findViewById(R.id.Button03);
- btn_stop_video = (Button) this.findViewById(R.id.Button04);
- btn_start_video.setOnClickListener(new ClickEvent());
- btn_stop_video.setOnClickListener(new ClickEvent());
- skb_video=(SeekBar)this.findViewById(R.id.SeekBar02);
- skb_video.setOnSeekBarChangeListener(new SeekBarChangeEvent());
- surfaceView = (SurfaceView) findViewById(R.id.SurfaceView01);
- surfaceHolder = surfaceView.getHolder();
- surfaceHolder.setFixedSize(100, 100);
- surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
- }
- /*
- * 按键事件处理
- */
- class ClickEvent implements View.OnClickListener{
- @Override
- public void onClick(View v) {
- if(v==btn_start_audio)
- {
- m.reset();//恢复到未初始化的状态
- m=MediaPlayer.create(testMedia.this, R.raw.big);//读取音频
- skb_audio.setMax(m.getDuration());//设置SeekBar的长度
- try {
- m.prepare(); //准备
- } catch (IllegalStateException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- } catch (IOException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- m.start(); //播放
- }
- else if(v==btn_stop_audio || v==btn_stop_video)
- {
- m.stop();
- }
- else if(v==btn_start_video)
- {
- m.reset();//恢复到未初始化的状态
- m=MediaPlayer.create(testMedia.this, R.raw.test);//读取视频
- skb_video.setMax(m.getDuration());//设置SeekBar的长度
- m.setAudioStreamType(AudioManager.STREAM_MUSIC);
- m.setDisplay(surfaceHolder);//设置屏幕
- try {
- m.prepare();
- } 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();
- }
- m.start();
- }
- }
- }
- /*
- * SeekBar进度改变事件
- */
- class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener{
- @Override
- public void onProgressChanged(SeekBar seekBar, int progress,
- boolean fromUser) {
- // TODO Auto-generated method stub
- }
- @Override
- public void onStartTrackingTouch(SeekBar seekBar) {
- isChanging=true;
- }
- @Override
- public void onStopTrackingTouch(SeekBar seekBar) {
- m.seekTo(seekBar.getProgress());
- isChanging=false;
- }
- }
- }
MediaPlayer开发全解析
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