ACTION_SCREEN_ON和ACTION_SCREEN_OFF不起作用？

Question

我正在尝试在屏幕关闭(锁定)时关闭WiFi,并在屏幕打开(解锁)时再次打开它.

我做了一个BroadcastReceiver; 放入清单这段代码:

<receiver android:name="MyIntentReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <action android:name="android.intent.action.SCREEN_OFF" />
                <action android:name="android.intent.action.SCREEN_ON" />
                <action android:name="android.intent.action.USER_PRESENT" />
                <category android:name="android.intent.category.HOME" />
                <category android:name="android.intent.category.LAUNCHER" />    
            </intent-filter>
        </receiver>

这是班级MyIntentReceiver:

package org.androidpeople.boot;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class MyIntentReceiver extends BroadcastReceiver {
    // Called when boot completes

    public static boolean startup;

    @Override
    public void onReceive(Context context, Intent intent) {
        // Set what activity should launch after boot completes

        System.out.println("Intent Action: " + intent.getAction());

        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {

            System.out.println("locked : ACTION_SCREEN_OFF");

        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {

            System.out.println("not locked : ACTION_SCREEN_ON ");

        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {

            System.out.println("User Unlocking it ");

        } 
        else if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
            // this to indicate that program is running
            // automaticlly not manually by user
            startup = true;
            System.out.println("Automatic BOOT at StartUp");

            Intent startupBootIntent = new Intent(context, LaunchActivity.class);
            startupBootIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(startupBootIntent);
        }

    }
}

其结果是-既ACTION_SCREEN_ON 和ACTION_SCREEN_OFF从未被解雇了! USER_PRESENT并且BOOT_COMPLETED工作得很好,但其他没有.我正在使用模拟器,而不是真正的设备 - 这会导致问题吗？

有帮助吗？我需要打开和关闭屏幕以启用/禁用WiFi以节省电池.

提前致谢

Answer 1

要捕获SCREEN_OFF和SCREEN_ON操作(可能还有其他操作),您必须按代码配置BroadcastReceiver,而不是通过清单.

IntentFilter intentFilter = new IntentFilter(Intent.ACTION_SCREEN_ON);
intentFilter.addAction(Intent.ACTION_SCREEN_OFF);
BroadcastReceiver mReceiver = new ScreenStateBroadcastReceiver();
registerReceiver(mReceiver, intentFilter);

它经过测试并且运行正常.

Answer 2

你无法通过XML捕获这些意图(我忘了为什么).但是,您可以使用a Service注册其中的BroadcastReceiver成员并在其中onStartCommand()注销它onDestroy().这将要求服务在后台运行,不断地或只要您需要它,所以一定要探索替代路线.

你可以BroadcastReceiver在你的Service类中定义如下:

private final class ScreenReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(final Context context, final Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
             //stuff
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
             //other stuff
        }
    }
}

对于一个稍微复杂的示例,但是一个显示BroadcastReceiver和Service交互的示例从我的应用程序,ElectricSleep 看到CheckForScreenBugAccelerometerService.