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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" > <EditTextandroid: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" /> <LinearLayoutandroid: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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