這個小應用常用於測試手機的耳機壽命。
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);// 把模式調成耳機放音模式 path = audio.getAbsolutePath(); play(0); // 設定音頻迴圈播放 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();// 把各項參數恢複到初始狀態 mediaPlayer.setDataSource(path); mediaPlayer.prepare();// 進行緩衝 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();// 開始播放 if (position > 0) mediaPlayer.seekTo(position); } }}
布局檔案:
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">音樂播放器</string> <string name="filename">音樂檔案名稱</string> <string name="playbutton">播放</string> <string name="stopbutton">停止</string> <string name="filenoexist">檔案沒有發現</string></resources>
最後記得加上許可權:
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>