Android 中按home键和跳转到主界面的实例代码

Intent intent= new Intent(Intent.ACTION_MAIN); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //如果是服务里调用，必须加入new task标识 intent.addCategory(Intent.CATEGORY_HOME); startActivity(intent); 

Intent intent = new Intent(Intent.ACTION_MAIN,null); ntent.addCategory(Intent.CATEGORY_HOME); startActivity(intent); 

AudioManager mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER,     AudioManager.FX_FOCUS_NAVIGATION_UP); mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER,     AudioManager.FX_FOCUS_NAVIGATION_UP);