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Android屏幕打开和屏幕关闭接收器在启动后不启动,除非活动进入焦点(使用Oreo)

android-8.1-oreo android-broadcastreceiver broadcastreceiver android

MPelletier · 技术社区 · 7 年前

我在摆弄广播接收器。我想锁上启动,屏幕打开和屏幕关闭。如果我为启动设置了一个,它可以正常工作:

在AndroidManifest.xml文件:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

<application
    android:name=".MyApp"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme" 

    <receiver
        android:name=".receivers.BootCompleteReceiver"
        android:enabled="true"
        android:exported="true"
        android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.action.QUICKBOOT_POWERON" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>

    <receiver android:name=".receivers.ScreenOnReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.SCREEN_ON" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>

    <receiver android:name=".receivers.ScreenOffReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.SCREEN_OFF" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>

class BootCompleteReceiver : BroadcastReceiver() {

    override fun onReceive(p0: Context, p1: Intent?) {
        if (p1?.action.equals(Intent.ACTION_BOOT_COMPLETED, true))
            Log.i(TAG, "Boot Time: %d".format(System.currentTimeMillis()))
    }
}

如果我重新启动手机,我可以在Logcat中看到启动时间信息。按预期工作。

但是,我还有两个接收器,开着屏幕,关着屏幕,它们的行为不一样。

代码:

class ScreenOnReceiver: BroadcastReceiver() {

    override fun onReceive(p0: Context, p1: Intent?) {
        if (p1?.action.equals(Intent.ACTION_SCREEN_ON, true))
            Log.i(TAG, "Screen On Time: %d".format(System.currentTimeMillis()))
    }
}

class ScreenOffReceiver: BroadcastReceiver() {

    override fun onReceive(p0: Context, p1: Intent?) {
        if (p1?.action.equals(Intent.ACTION_SCREEN_OFF, true))
            Log.i(TAG, "Screen Off Time: %d".format(System.currentTimeMillis()))
    }
}

我的应用程序:

private lateinit var screenOnReceiver: ScreenOnReceiver
private lateinit var screenOffReceiver: ScreenOffReceiver

override fun onCreate() {
    super.onCreate()

    val screenOnIntentFilter = IntentFilter(Intent.ACTION_SCREEN_ON)
    screenOnReceiver = ScreenOnReceiver()
    registerReceiver(screenOnReceiver, screenOnIntentFilter)

    val screenOffIntentFilter = IntentFilter(Intent.ACTION_SCREEN_OFF)
    screenOffReceiver = ScreenOffReceiver()
    registerReceiver(screenOffReceiver, screenOffIntentFilter)
}

这两个不会记录任何东西,除非我将(已经运行的)应用程序(或者更确切地说,它的活动,没有什么特别的)调到焦点一次。然后他们每次都开火。如何确保屏幕关闭和屏幕打开接收器在开机后立即接收?

0 回复 | 直到 7 年前