从头学Android之多媒体--使用MediaPlayer播放音频示例代码

package com.jiahui.media; import java.io.IOException; import android.app.Activity; import android.content.res.AssetFileDescriptor; import android.content.res.AssetManager; import android.media.MediaPlayer; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MediaPlayerDemoActivity extends Activity implements OnClickListener { private Button btnAppStart, btnAssetsStart, btnSdcardStart, btnNetworkStart; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btnAppStart = (Button) this.findViewById(R.id.btnAppStart); btnAssetsStart = (Button) this.findViewById(R.id.btnAssetsStart); btnSdcardStart = (Button) this.findViewById(R.id.btnSdcardStart); btnNetworkStart = (Button) this.findViewById(R.id.btnNetworkStart); btnAppStart.setOnClickListener(this); btnAssetsStart.setOnClickListener(this); btnSdcardStart.setOnClickListener(this); btnNetworkStart.setOnClickListener(this); } @Override public void onClick(View v) { MediaPlayer mediaPlayer = null; switch (v.getId()) { case R.id.btnAppStart: System.out.println("---播放应用的资源文件----"); // 使用raw下的资源文件创建MediaPlayer对象 mediaPlayer = MediaPlayer.create(MediaPlayerDemoActivity.this, R.raw.a1); mediaPlayer.start(); break; case R.id.btnAssetsStart: System.out.println("---播放assest的资源文件----"); AssetManager assetManager = this.getAssets(); try { AssetFileDescriptor fileDescriptor = assetManager .openFd("a2.mp3"); mediaPlayer = new MediaPlayer(); mediaPlayer.setDataSource(fileDescriptor.getFileDescriptor(), fileDescriptor.getStartOffset(), fileDescriptor.getLength()); mediaPlayer.prepare(); mediaPlayer.start(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } break; case R.id.btnSdcardStart: System.out.println("---播放SDcard上的文件---"); try { mediaPlayer = new MediaPlayer(); mediaPlayer.setDataSource("/mnt/sdcard/a3.mp3"); mediaPlayer.prepare(); mediaPlayer.start(); } catch (Exception e) { } break; case R.id.btnNetworkStart: System.out.println("播放网络上的音频"); // http://zhangmenshiting2.baidu.com/data2/music/9138619/9138619.mp3? // xcode=dd0d0d0df7218eb9a79c7fd72cefb648&mid=0.18926789458694 try { // mediaPlayer = new MediaPlayer(); // 通过Uri解析一个网络地址 Uri uri = Uri .parse("http://zhangmenshiting2.baidu.com/data2/music/9138619/9138619.mp3?xcode=dd0d0d0df7218eb9a79c7fd72cefb648&mid=0.18926789458694"); mediaPlayer.setDataSource(MediaPlayerDemoActivity.this, uri); // mediaPlayer.prepare(); // 也可以直接通过这种方式装载网络上的音频文件 mediaPlayer = MediaPlayer.create(MediaPlayerDemoActivity.this, uri); mediaPlayer.start(); } catch (Exception e) { // TODO: handle exception } break; default: break; } } }