1.Android MediaPlayer的使用

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本文介绍Android 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：

MediaPlayer效果图

main.xml的源码：

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/LinearLayout01"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
    <SeekBar
        android:id="@+id/SeekBar01"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"></SeekBar>
    <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>
        <Button
            android:id="@+id/Button02"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="停止播放"></Button>
    </LinearLayout>
    <SeekBar
        android:id="@+id/SeekBar02"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"></SeekBar>
    <SurfaceView
        android:id="@+id/SurfaceView01"
        android:layout_width="fill_parent"
        android:layout_height="250px"></SurfaceView>
    <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>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="停止播放"
            android:id="@+id/Button04"></Button>
    </LinearLayout>
</LinearLayout>

本文程序的源码，有点长：

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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;
        }
    }
}

本文转自：http://blog.csdn.net/hellogv/article/details/5975864