本文调用android的媒体播放器实现一些音乐播放操作
项目布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity" > <EditText android:id="@+id/et_path" android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="请输入音乐文件的路径" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:id="@+id/bt_play" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:text="播放" /> <Button android:id="@+id/bt_pause" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:text="暂停" /> <Button android:id="@+id/bt_replay" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:text="重播" /> <Button android:id="@+id/bt_stop" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:text="停止" /> </LinearLayout> </LinearLayout>
可以查看本地sdk中的文件查看相关api
file:///……/sdk/docs/guide/topics/media/mediaplayer.html
相关逻辑部分代码如下：
package com.wuyudong.mp3player; import java.io.File; import java.io.IOException; import android.media.AudioManager; import android.media.MediaPlayer; import android.media.MediaPlayer.OnCompletionListener; import android.net.Uri; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends Activity implements OnClickListener { private EditText et_path; private Button bt_play, bt_replay, bt_pause, bt_stop; private MediaPlayer mediaPlayer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et_path = (EditText) findViewById(R.id.et_path); bt_play = (Button) findViewById(R.id.bt_play); bt_replay = (Button) findViewById(R.id.bt_replay); bt_pause = (Button) findViewById(R.id.bt_pause); bt_stop = (Button) findViewById(R.id.bt_stop); bt_pause.setOnClickListener(this); bt_play.setOnClickListener(this); bt_replay.setOnClickListener(this); bt_stop.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.bt_play: play(); break; case R.id.bt_replay: replay(); break; case R.id.bt_stop: stop(); break; case R.id.bt_pause: pause(); break; default: break; } } /** * 暂停音乐 */ private void pause() { if ("继续".equals(bt_pause.getText().toString().trim())) { mediaPlayer.start(); bt_pause.setText("暂停"); return; } if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.pause(); bt_pause.setText("继续"); return; } } /** * 重新播放 */ private void replay() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.seekTo(0); return; } play(); } /** * 停止播放音乐 */ private void stop() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.stop(); mediaPlayer.release(); // 记得释放资源 mediaPlayer = null; bt_play.setEnabled(true); } } /** * 播放音乐 */ private void play() { String path = et_path.getText().toString().trim(); File file = new File(path); if (file.exists() && file.length() > 0) { try { mediaPlayer = new MediaPlayer(); mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); mediaPlayer.setDataSource(path); mediaPlayer.prepare(); // might take long! (for buffering, etc) mediaPlayer.start(); mediaPlayer.setOnCompletionListener(new OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { bt_play.setEnabled(true); } } ); bt_play.setEnabled(false); } catch (Exception e) { Toast.makeText(this, "播放失败", 0).show(); e.printStackTrace(); } } else { Toast.makeText(this, "文件不存在", 0).show(); } } }
在执行代码之前先上传一份音频文件到sdcard
最后运行项目实现的效果如下：
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