Android添加USB连接提示音（SettingsProvider,PowerUI）

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在framework/base/package/SettingsProvider/src/DatabaseHelper.java的方法loadGlobalSettings中添加如下内容：

loadStringSetting(stmt,Settings.Global.USB_BATTERY_SOUND,R.string.def_usb_battery_sound);

参数stmt定义和初始化

SQLiteStatement stmt=null;
stmt=db.compileStatement(“INSERT OR IGNORE INTO global(name,value)”+” VALUES(?,?);”);

loadStringSetting ->loadSetting

private void loadSetting(SQLiteStatement stmt,String key,Object value){
stmt.bindString(1,key);
stmt.bindString(2,value.toString());
stmt.execute();
}//这个方法实际上就是把数据存入数据库的操作

SQLiteStatement的使用见https://liuzhichao.com/p/1664.html

参数Settings.Gloval.USB_BATTERY_SOUND是在framework/base/core/java/android/provider/Settings里面添加的URI

/***URI for the charge sound file.*@hide(不对外部开发)*/
public static final String USB_BATTERY_SOUND=”usb_battery_sound”;

参数R.string.def_usb_battery_sound是在framework/base/package/SettingsProvider/res/value/defaults.xml中定义的文件路径，如下

<string name=”def_usb_battery_sound” translatable=”false”>/system/media/audio/notifications/Hs_in_charger.mp3</string>

该文件是通过mk文件拷贝到相应路径下的，framework/base/data/sounds/AllAudio.mk中添加

$(LOCAL_PATH)/notifications/Hs_in_charger.mp3:system/media/audio/notifications/Hs_in_charger.mp3 \

首先要在路径$(LOCAL_PATH)/notifications/下放入文件Hs_in_charger.mp3

播放提示音添加的代码，位置是framework/base/packages/SystemUI/src/com/android/systemui/power/PowerUI.java

1.      导入用到的类

import android.media.MediaPlayer;
import android.media.AudioManager;
import android.net.Uri;
import android.os.Vibrator;

2.      设置振动间隔

private static final long[] sVibratePattern={50,200};

3.      在onReceive方法中添加

if(plugged && !oldPlugged){playSoundbattery();//判断当前USB是否插入，如果插入，播放提示音
}

4.     编写播放提示音的方法

private void playSoundbattery(){
MediaPlayer player=new MeidaPlayer();
final ContentResolver cr=mContext.getContentResolver();
final String mSoundPath=Settings.Global.getString(cr,
Settings.Global.USB_BATTERY_SOUND);//得到之前载入到数据库的文件路径if(mSoundPath!=null){final Uri soundUri=Uri.parse(“file://”+mSoundPath);try{player.setDataSource(mContext,soundUri);
}catch(Exception e){e.printStackTrace();
}
}final AudioManager audioManager=
(AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);
if(audioManager.getStreamVolume(AudioManager.STREAN_RING)!=0){player.setAudioStreamType(AudioManager.STREAM_RING);//设置音量
try{player.prepare();
}catch(Exception e){e.printStackTrace();
}
player.start();
}//only in silent mode vibrator work
if(audioManager.getRingerMode()==AudioManager.RINGER_MODE_SILENT||audioManager.getRingerMode()==AudioManager.RINGER_MODE_VIBRATE){Vibrator vibrator=(Vibrator)mContext.getSystemService(Context.VIBRATOR_SERVICE);if(vibrator!=null){vibrator.vibrate(sVibratePattern,-1);//Vibrator shold shutdown at onStop,but if it won’ttry{Thread.sleep(1000);vibrator.cancel();
}catch(Exception e){e.printStackTrace();
}
}
}
}

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