android用听筒不断播放音乐

这个小应用常用于测试手机的听筒寿命。

MainActivity:

package morgen.headphone;import java.io.File;import android.app.Activity;import android.content.Context;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnPreparedListener;import android.os.Bundle;import android.os.Environment;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity { private EditText nameText; private String path; private MediaPlayer mediaPlayer; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mediaPlayer = new MediaPlayer(); nameText = (EditText) this.findViewById(R.id.filename); } @Override protected void onDestroy() { mediaPlayer.release(); mediaPlayer = null; super.onDestroy(); } public void mediaplay(View v) { switch (v.getId()) { case R.id.playbutton: String filename = nameText.getText().toString(); File audio = new File(Environment.getExternalStorageDirectory(), filename); if (audio.exists()) { AudioManager audioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE); audioManager.setMode(AudioManager.MODE_IN_CALL);// 把模式调成听筒放音模式 path = audio.getAbsolutePath(); play(0); // 设置音频循环播放 mediaPlayer.setLooping(true); } else { path = null; Toast.makeText(getApplicationContext(), R.string.filenoexist, 1).show(); } break; case R.id.stopbutton: if (mediaPlayer.isPlaying()) mediaPlayer.stop(); AudioManager audioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE); audioManager.setMode(AudioManager.MODE_NORMAL); break; } } private void play(int position) { try { mediaPlayer.reset();// 把各项参数恢复到初始状态 mediaPlayer.setDataSource(path); mediaPlayer.prepare();// 进行缓冲 mediaPlayer.setOnPreparedListener(new PrepareListener(position)); } catch (Exception e) { e.printStackTrace(); } } private final class PrepareListener implements OnPreparedListener { private int position; public PrepareListener(int position) { this.position = position; } public void onPrepared(MediaPlayer mp) { mediaPlayer.start();// 开始播放 if (position > 0) mediaPlayer.seekTo(position); } }}

布局文件：

main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/filename"    />        <EditText    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="tianzhao.mp3"    android:id="@+id/filename"    />    <LinearLayout    android:orientation="horizontal"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    >     <Button      android:layout_width="100dip"      android:layout_height="60dip"      android:text="@string/playbutton"      android:onClick="mediaplay"      android:id="@+id/playbutton"      /> <Button     android:layout_width="100dip"      android:layout_height="60dip"      android:text="@string/stopbutton"      android:onClick="mediaplay"      android:id="@+id/stopbutton"      />           </LinearLayout></LinearLayout>

strings.xml:

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, MainActivity!</string>    <string name="app_name">音乐播放器</string>    <string name="filename">音乐文件名称</string>    <string name="playbutton">播放</string>    <string name="stopbutton">停止</string>    <string name="filenoexist">文件没有发现</string></resources>

最后记得加上权限：

<uses-permissionandroid:name="android.permission.MODIFY_AUDIO_SETTINGS"/>

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