Android系列之MediaPlayer 多媒体播放器
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。
先看看效果吧！
main.xml
1
<?
xml version="1.0" encoding="utf-8"
?>
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<
LinearLayout
android:id
="@+id/LinearLayout01"
3
android:layout_width
="fill_parent"
android:layout_height
="fill_parent"
4
xmlns:android
="http://schemas.android.com/apk/res/android"
5
android:orientation
="vertical"
>
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<
SeekBar
android:id
="@+id/SeekBar01"
android:layout_height
="wrap_content"
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android:layout_width
="fill_parent"
></
SeekBar
>
8
<
LinearLayout
android:id
="@+id/LinearLayout02"
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android:layout_width
="wrap_content"
android:layout_height
="wrap_content"
>
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<
Button
android:id
="@+id/Button01"
android:layout_width
="wrap_content"
11
android:layout_height
="wrap_content"
android:text
="播放音频"
></
Button
>
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<
Button
android:id
="@+id/Button02"
android:layout_width
="wrap_content"
13
android:layout_height
="wrap_content"
android:text
="停止播放"
></
Button
>
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</
LinearLayout
>
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<
SeekBar
android:id
="@+id/SeekBar02"
android:layout_height
="wrap_content"
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android:layout_width
="fill_parent"
></
SeekBar
>
17
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<
SurfaceView
android:id
="@+id/SurfaceView01"
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android:layout_width
="fill_parent"
android:layout_height
="250px"
></
SurfaceView
>
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<
LinearLayout
android:id
="@+id/LinearLayout02"
21
android:layout_width
="wrap_content"
android:layout_height
="wrap_content"
>
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<
Button
android:layout_width
="wrap_content"
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android:layout_height
="wrap_content"
android:id
="@+id/Button03"
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android:text
="播放视频"
></
Button
>
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<
Button
android:layout_width
="wrap_content"
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android:layout_height
="wrap_content"
android:text
="停止播放"
android:id
="@+id/Button04"
></
Button
>
27
</
LinearLayout
>
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</
LinearLayout
>
29
TestMedia.java
1
package com.testMedia;
2
3
import java.io.IOException;
4
import java.util.Timer;
5
import java.util.TimerTask;
6
import android.app.Activity;
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import android.media.AudioManager;
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import android.media.MediaPlayer;
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import android.os.Bundle;
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import android.view.SurfaceHolder;
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import android.view.SurfaceView;
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import android.view.View;
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import android.widget.Button;
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import android.widget.SeekBar;
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import android.widget.Toast;
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17
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public class TestMedia extends Activity {
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/** Called when the activity is first created. */
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private SeekBar skb_audio=null;
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private Button btn_start_audio = null;
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private Button btn_stop_audio = null;
24
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private SeekBar skb_video=null;
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private Button btn_start_video = null;
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private Button btn_stop_video = null;
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private SurfaceView surfaceView;
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private SurfaceHolder surfaceHolder;
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private MediaPlayer m = null;
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private Timer mTimer;
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private TimerTask mTimerTask;
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private boolean isChanging=false;//互斥变量，防止定时器与SeekBar拖动时进度冲突
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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//----------Media控件设置---------//
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m=new MediaPlayer();
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//播放结束之后弹出提示
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m.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){
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@Override
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public void onCompletion(MediaPlayer arg0) {
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Toast.makeText(testMedia.this, "结束", 1000).show();
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m.release();
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}
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});
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//----------定时器记录播放进度---------//
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mTimer = new Timer();
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mTimerTask = new TimerTask() {
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@Override
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public void run() {
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if(isChanging==true)
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return;
60
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if(m.getVideoHeight()==0)
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skb_audio.setProgress(m.getCurrentPosition());
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else
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skb_video.setProgress(m.getCurrentPosition());
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}
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};
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mTimer.schedule(mTimerTask, 0, 10);
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btn_start_audio = (Button) this.findViewById(R.id.Button01);
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btn_stop_audio = (Button) this.findViewById(R.id.Button02);
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btn_start_audio.setOnClickListener(new ClickEvent());
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btn_stop_audio.setOnClickListener(new ClickEvent());
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skb_audio=(SeekBar)this.findViewById(R.id.SeekBar01);
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skb_audio.setOnSeekBarChangeListener(new SeekBarChangeEvent());
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btn_start_video = (Button) this.findViewById(R.id.Button03);
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btn_stop_video = (Button) this.findViewById(R.id.Button04);
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btn_start_video.setOnClickListener(new ClickEvent());
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btn_stop_video.setOnClickListener(new ClickEvent());
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skb_video=(SeekBar)this.findViewById(R.id.SeekBar02);
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skb_video.setOnSeekBarChangeListener(new SeekBarChangeEvent());
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surfaceView = (SurfaceView) findViewById(R.id.SurfaceView01);
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surfaceHolder = surfaceView.getHolder();
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surfaceHolder.setFixedSize(100, 100);
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surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
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}
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/**
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* 按键事件处理
91
*/
92
class ClickEvent implements View.OnClickListener{
93
@Override
94
public void onClick(View v) {
95
if(v==btn_start_audio)
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{
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m.reset();//恢复到未初始化的状态
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m=MediaPlayer.create(testMedia.this, R.raw.big);//读取音频
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skb_audio.setMax(m.getDuration());//设置SeekBar的长度
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try {
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m.prepare(); //准备
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} catch (IllegalStateException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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m.start(); //播放
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}
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else if(v==btn_stop_audio || v==btn_stop_video)
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{
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m.stop();
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}
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else if(v==btn_start_video)
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{
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m.reset();//恢复到未初始化的状态
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m=MediaPlayer.create(testMedia.this, R.raw.test);//读取视频
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skb_video.setMax(m.getDuration());//设置SeekBar的长度
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m.setAudioStreamType(AudioManager.STREAM_MUSIC);
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m.setDisplay(surfaceHolder);//设置屏幕
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try {
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m.prepare();
125
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} catch (IllegalArgumentException e) {
127
// TODO Auto-generated catch block
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e.printStackTrace();
129
} catch (IllegalStateException e) {
130
// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (IOException e) {
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// TODO Auto-generated catch block
134
e.printStackTrace();
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}
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m.start();
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}
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}
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}
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/**
142
* SeekBar进度改变事件
143
*/
144
class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener{
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146
@Override
147
public void onProgressChanged(SeekBar seekBar, int progress,
148
boolean fromUser) {
149
// TODO Auto-generated method stub
150
151
}
152
153
@Override
154
public void onStartTrackingTouch(SeekBar seekBar) {
155
isChanging=true;
156
}
157
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@Override
159
public void onStopTrackingTouch(SeekBar seekBar) {
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m.seekTo(seekBar.getProgress());
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isChanging=false;
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}
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}
165
166
}
167