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        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);       intent.addCategory(Intent.CATEGORY_HOME);        startActivity(intent);

//音量减

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);