Android实现手电筒电源键关闭功能

在打开手电筒之后 机器休眠 客户要求点击电源键 手电筒需要关闭

frameworks\base\services\core\java\com\android\server\policy\phonewindowmanager.java
 @override
 public void screenturnedon() {
  synchronized (mlock) {
   if (mkeyguarddelegate != null) {
    mkeyguarddelegate.onscreenturnedon();
   }
   //add start
    if (systemproperties.getint("persist.sys.screen_first_on", 1) == 0) {
    android.util.log.d("chch", "turnoffflashlightifneed");
    turnoffflashlightifneed();
   }else{
    systemproperties.set("persist.sys.screen_first_on", "0");
   }
   //end
  }
 }
  //chch add start
 private void turnoffflashlightifneed(){
  try{
   mcameramanager = (cameramanager) mcontext.getsystemservice(context.camera_service);
   mcameraid = mcameramanager.getcameraidlist()[0];
   mcameramanager.settorchmode(mcameraid,false);
  }catch(exception e){
   android.util.log.d("chch", "camera error");
  }
 }
 //chch end

前面要增加

import android.hardware.camera2.cameramanager;

增加变量

cameramanager mcameramanager; 
string mcameraid;

总结

以上所述是小编给大家介绍的android实现手电筒电源键关闭功能，希望对大家有所帮助