开发后台服务的时候经常需要对屏幕状态进行判断,如果是想要监听屏幕解锁事件,可以在配置里面注册action为 android.intent.action.USER_PRESENT的广播,则可以监听解锁事件。但有时候,在后台执行某个操作时,需要主动判断屏幕的状态,比如是否是亮着的,可以使用PowerManager的isScreenOn方法进行判断,比如屏幕是否开启了自动旋转等。
注册监听解锁广播:
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< receiver android:name = "com.home.testscreen.MyReceiver" >
< intent-filter >
< action android:name = "android.intent.action.USER_PRESENT" />
</ intent-filter >
</ receiver >
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MyReceiver:
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package com.home.testscreen;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class MyReceiver extends BroadcastReceiver
@Override public void onReceive(Context
// 解锁
if (intent != null && Intent.ACTION_USER_PRESENT.equals(intent.getAction())) {
Toast.makeText(context, "屏幕已解锁" , Toast.LENGTH_SHORT).show();
}
}
} |
主动判断屏幕是否亮着:
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public boolean isScreenOn(Context
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
if (pm.isScreenOn()) {
return true ;
}
return false ;
} |
判断是否开启了重力感应:
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/** * 是否开启了重力感应
* @param context
* @return
*/ public boolean screenIsOpenRotate(Context
int gravity = 0 ;
try {
gravity = Settings.System.getInt(context.getContentResolver(),
Settings.System.ACCELEROMETER_ROTATION);
} catch (SettingNotFoundException
e.printStackTrace();
}
if (gravity == 1 )
return true ;
}
return false ;
} |