Question

我正试图让我的屏幕开启/关闭以使用我的服务，但到目前为止还没有运气。

目标是：当屏幕变为OFF时，让LED灯（软键）熄灭，当屏幕返回时，软键灯亮，并且用户在我的应用程序中输入的值（您将看到TextXLActivity。 getledC（）从主活动中获取Int）

在我的主要活动中，我可以毫无问题地控制LED灯，使用SeekBar等。唯一不起作用的是接收器/服务

现在当我去设置，应用程序，运行服务时，我的应用程序没有列在任何地方，我担心我的服务根本没有启动，也许这就是问题所在。

这是我的接收者：

package com.test.xl;

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

public class ScreenReceiver extends BroadcastReceiver {

private boolean screenOff;

@Override
public void onReceive(Context context, Intent intent) {
    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
        screenOff = true;
    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
        screenOff = false;
    }
    Intent i = new Intent(context, UpdateService.class);
    i.putExtra("screen_state", screenOff);
    context.startService(i);
}



}

这是我的服务：

package com.test.xl;




import com.sonyericsson.illumination.IlluminationIntent;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;

public class UpdateService extends Service {

@Override
public void onCreate() {
    super.onCreate();
    // register receiver that handles screen on and screen off logic
    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    BroadcastReceiver mReceiver = new ScreenReceiver();
    registerReceiver(mReceiver, filter);

}
@Override
public void onStart(Intent intent, int startId) {
    boolean screenOn = intent.getBooleanExtra("screen_state", false);
    if (!screenOn) {

        {
            Intent led = new Intent(IlluminationIntent.ACTION_START_LED);
            led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");
            led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
            led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, TestXLActivity.getledC());
            startService(led);
        }

    } else {


        Intent led = new Intent(IlluminationIntent.ACTION_STOP_LED);
        led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");
        led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, 0xFFFFFFFF);
        startService(led);

    }
}

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}

}

这是一个测试应用程序我开始尝试并了解接收器/服务“关系”，任何帮助将不胜感激！ ;）

我还注意到我的服务迫使我实现这一行：

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}

我遵循了一个关于如何让我的服务与Receiver进行交互的教程，以及最后没有类似内容的源代码，任何猜测？

祝你好运

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test.xl"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="10"/>
<uses-permission android:name="com.sonyericsson.illumination.permission.ILLUMINATION"/>

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".TestXLActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
            <receiver android:name=".ScreenReceiver">
 <intent-filter>
<action android:name="android.intent.action..ACTION_SCREEN_ON" />
<action android:name="android.intent.action.ACTION_SCREEN_OFF" />
</intent-filter>
</receiver>

        </intent-filter>
    </activity>
</application>

</manifest>

编辑：以下是出现错误的源代码（startService（led））：

package com.test.xl;

import com.sonyericsson.illumination.IlluminationIntent;

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

public class ScreenReceiver extends BroadcastReceiver {

private boolean screenOff;

@Override
public void onReceive(Context context, Intent intent) {
    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {

        Intent led = new Intent(IlluminationIntent.ACTION_STOP_LED);
        led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");
        led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, 0xFFFFFFFF);
        startService(led);
        screenOff = true;
    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {

        Intent led = new Intent(IlluminationIntent.ACTION_START_LED);
        led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");
        led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, TestXLActivity.getledC());
        startService(led);
        screenOff = false;
    }

}

}

新代码

public class ScreenReceiver extends BroadcastReceiver {

private boolean screenOff;

@Override
public void onReceive(Context context, Intent intent) {
    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {

        Intent led = new Intent(IlluminationIntent.ACTION_STOP_LED);
        led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");
        led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, 0xFFFFFFFF);
        context.startService(led);
        screenOff = true;
    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {

        int ledC = TestXLActivity.getledC();

        Intent led = new Intent(IlluminationIntent.ACTION_START_LED);
        led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");
        led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, ledC);
        context.startService(led);
        screenOff = false;
    }

}

public class UpdateService extends Service {

private ScreenReceiver mReceiver = null;

@Override
public void onCreate() {
    super.onCreate();
    // register receiver that handles screen on and screen off logic
    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    if(mReceiver != null)mReceiver = new ScreenReceiver();
    registerReceiver(mReceiver, filter);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    return Service.START_STICKY;
}

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onDestroy() {
    unregisterReceiver(mReceiver);
    super.onDestroy();
}

}

Answer 1

我认为您的问题是您的BroadcastReceiver mReceiver在您的服务的onCreate方法之后无法生存。此外，你没有宣布它是正确的。如果我是你，我会做这样的事情：

public class UpdateService extends Service {

private ScreenReceiver mReceiver = null;

@Override
public void onCreate() {
    super.onCreate();
    // register receiver that handles screen on and screen off logic
    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    if(mReceiver != null)mReceiver = new ScreenReceiver();
    registerReceiver(mReceiver, filter);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    *** NOTE HERE THAT I AM OVERRIDING THE ONSTART AS AN INT NOT VOID***

    .... do your stuff here....

    return Service.START_STICKY;
}

现在你的方法还有另一个问题。您正在服务的onCreate方法中声明并实例化您的接收器，然后您从接收器的onReceive方法中启动AGAIN服务。这不是android服务的工作方式。正确的方法是从服务的onCreate方法实例化和注册接收器，并从应用程序的另一个点启动服务，例如，如果它是app-widget，您可以从WidgetProvider的onUpdate方法或从一些Activity的onCreate方法。

所以你的代码应该如下：

您的收件人：

public class ScreenReceiver extends BroadcastReceiver {

    private boolean screenOff;

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            screenOff = true;
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            screenOff = false;
        }

        ... Do your stuff here for screen on or off ....
        ... AND DO NOT START A SERVICE FROM HERE ....
    }
}

您的服务：

public class UpdateService extends Service {

    private ScreenReceiver mReceiver = null;

    @Override
    public void onCreate() {
        super.onCreate();
        // register receiver that handles screen on and screen off logic
        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        if(mReceiver != null)mReceiver = new ScreenReceiver();
        registerReceiver(mReceiver, filter);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        NOTE HERE THAT I AM OVERRIDING THE ONSTART AS AN INT NOT VOID

        .... YOU DON'T HAVE TO DO SOMETHING HERE EXCEPT FROM SOME ....
        .... INITIALIZATION CODE ...

        return Service.START_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onDestroy() {
        UnregisterReceiver(mReceiver);
        super.onDestroy();
    }
}

您的活动或其他代码点：

startService（new Intent（context，UpdateService.class））;

这里发生的是：

当startService执行时，实例化您的服务并执行onCreate方法，其中接收者已注册并开始监视Intents。然后调用服务的onStart方法并返回START_STICKY，这意味着如果从系统终止服务将重新启动，因此接收器将再次注册，依此类推。 BTW只要你的服务终止onDestroy方法将被调用，接收器将被取消注册（这是一件非常糟糕的事情）。

现在，您已准备好运行服务，以便接收来自系统的通知。

如果您希望在某个时候终止服务，只需拨打

context.stopService(new Intent(context, UpdateService.class));

我并不深入了解Android服务，但这项技术与我同时托管BroadcastReceiver和ContentObserver的服务非常有效。

根据您的新进展进行编辑

好了，现在好像我们到了某个地方。我可以在你的onReceive方法中看到

@Override
public void onReceive(Context context, Intent intent) {
    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
        Intent led = new Intent(IlluminationIntent.ACTION_STOP_LED);
        led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");
        led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, 0xFFFFFFFF);
        context.startService(led);
        screenOff = true;
    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {

        int ledC = TestXLActivity.getledC();

        Intent led = new Intent(IlluminationIntent.ACTION_START_LED);
        led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");
        led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, ledC);
        context.startService(led);
        screenOff = false;
    }
}

您正在声明一个intent并且您正在使用它来启动服务，但您没有指定要启动的服务。我认为你缺少像led.setClass这样的东西。但为了清楚一点，让我们像这样修改onReceive：

@Override
public void onReceive(Context context, Intent intent) {
    Intent led = new Intent(context, your_led_service_name.class);
    led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");

    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
        led.addAction(IlluminationIntent.ACTION_STOP_LED);
        led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, 0xFFFFFFFF);
        context.startService(led);
        screenOff = true;
    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
        int ledC = TestXLActivity.getledC();
        led.addAction(IlluminationIntent.ACTION_START_LED);
        led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, ledC);
        context.startService(led);
        screenOff = false;
    }
}

看看现在怎么样......

第二次编辑

好的我对Sony Ericsson Illumination API一无所知，但根据您的代码，您可能需要更改onReceive，如下所示：

@Override
public void onReceive(Context context, Intent intent) {
    IlluminationIntent led = new IlluminationIntent(??);
    //Note: In place of ?? you may need your context on nothing at all
    //it depends on sony's API.

    led.putExtra(IlluminationIntent.EXTRA_PACKAGE_NAME, "com.test.xl");

    led.putExtra(IlluminationIntent.EXTRA_LED_ID, IlluminationIntent.VALUE_BUTTON_2);
    //This is only needed once...

    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
        led.addAction(IlluminationIntent.ACTION_STOP_LED);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, 0xFFFFFFFF);
        screenOff = true;
    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
        int ledC = TestXLActivity.getledC();
        led.addAction(IlluminationIntent.ACTION_START_LED);
        led.putExtra(IlluminationIntent.EXTRA_LED_COLOR, ledC);
        screenOff = false;
    }

    context.startService(led);
}

希望这会有所帮助......

屏幕接收器在我的服务中不起作用

1 个答案: