Android背景音乐设置代码

package keNan.com.music; import keNan.com.music.R; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.media.MediaPlayer; import android.net.Uri; import android.os.Bundle; import android.preference.PreferenceManager; import android.view.Menu; import android.view.MenuItem; public class BackgroundMusicActivity extends Activity { private SharedPreferences sp; private boolean musicEn; private MediaPlayer mediaPlayer; private String musicUriString; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initPreferenceSettings(); } private void initPreferenceSettings() { // Play background music from user's choice in Settings.java //SharedPreferences sharedPreferences = getSharedPreferences("keNan.com.music_preferences",MODE_WORLD_READABLE); sp = PreferenceManager.getDefaultSharedPreferences(this); musicEn = sp.getBoolean(getResources().getString(R.string.musicToggleKey), false); final String musicUriString = sp.getString(getResources().getString(R.string.musiclistKey), null); if (musicEn && (null != musicUriString)) { Uri uri = Uri.parse(musicUriString); /** * If this.musicUriString doesn't equal musicUriString, it means that * we change the title of the background music. So we need create a * new mediaPlayer. */ if ((null == mediaPlayer) || false == this.musicUriString.equals(musicUriString)) { this.musicUriString = musicUriString; mediaPlayer = MediaPlayer.create(this, uri); mediaPlayer.setLooping(true); mediaPlayer.start(); } else { mediaPlayer.start(); } } } /** * Pause music player. */ @Override protected void onStop() { super.onStop(); if (null != mediaPlayer) { mediaPlayer.pause(); } } /** * Replay music. */ @Override protected void onRestart() { super.onRestart(); initPreferenceSettings(); } /** * Release music resources. */ @Override protected void onDestroy() { super.onDestroy(); if (null != mediaPlayer) { mediaPlayer.stop(); mediaPlayer.release(); mediaPlayer = null; } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.settings: startActivity(new Intent(this, Settings.class)); break; default: break; } return super.onOptionsItemSelected(item); } }