屏幕开/关的广播接收器不起作用

Question

屏幕开/关的广播接收器不起作用

androidbroadcastreceiverandroid-broadcast

7

我正尝试使用BroadcastReceiver，但它无法正常工作，请帮助我解决这个问题。 MyReceiver.java

package com.example.broadcast_receiver;

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

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Log.i("[BroadcastReceiver]", "MyReceiver");

        if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)){
            Log.i("[BroadcastReceiver]", "Screen ON");
        }
        else if(intent.getAction().equals(Intent.ACTION_SCREEN_OFF)){
            Log.i("[BroadcastReceiver]", "Screen OFF");
        }
    }
}

AndroidManifest.xml

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

    <uses-sdk
        android:minSdkVersion="9"
        android:targetSdkVersion="16" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <receiver android:name=".MyReceiver" 
            android:enabled="true"
            android:exported="false">
            <intent-filter>
                <action android:name="android.intent.action.SCREEN_ON"/>
                <action android:name="android.intent.action.SCREEN_OFF"/>
            </intent-filter>
        </receiver>

        <activity
            android:name="com.example.broadcast_receiver.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

广播接收器无法工作，也没有产生任何日志，请帮助我解决这个问题。

- user2290872

请查看以下链接：https://dev59.com/52kx5IYBdhLWcg3wCf8q#9478013 - MysticMagicϡ

请使用其他服务进行注册。已收到消息或来电，请检查日志。 - Akshay Joy

检查这个可能对你有帮助：https://dev59.com/52kx5IYBdhLWcg3wCf8q - nilkash

@user2290872 请查看此链接，可能会有所帮助：无需服务的屏幕开关广播监听器。 - Ankit Kumar Singh

3个回答

5

如果您希望系统调用此接收器，您需要将其导出。将exported =“false”更改为true或完全删除exported，即可使其开始工作。通常这样做可能存在安全隐患，但由于SCREEN_ON和SCREEN_OFF都是受保护广播，并且您验证了操作，因此只有更可信赖的系统代码才能向您发送它们，因此它非常安全。

遗憾的是，在此情况下，这不起作用，因为意图广播具有以下标志：Intent.FLAG_RECEIVER_REGISTERED_ONLY | Intent.FLAG_RECEIVER_FOREGROUND

- Jesse

3

您能尝试获取电池数值吗：

public class Broadcast extends Activity {
    //Create broadcast object
    BroadcastReceiver mybroadcast = new BroadcastReceiver() {

        //When Event is published, onReceive method is called
        @Override
        public void onReceive(Context context, Intent intent) {
            //Get battery percentage
            int batterylevel = intent.getIntExtra("level", 0);    
            //get progressbar
            ProgressBar myprogressbar = (ProgressBar) findViewById(R.id.progressbar);
            myprogressbar.setProgress(batterylevel);
            TextView tv = (TextView) findViewById(R.id.textfield);
            //Set TextView with text
            tv.setText("Battery Level: " + Integer.toString(batterylevel) + "%");
        }
    });

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_broadcast);   
        registerReceiver(mybroadcast, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
    }
}

- kavya

是的，它正在工作，但我希望在关闭我的应用程序后仍能运行，因为我正在制作锁屏应用，你有什么想法吗？ - user2290872

你在“服务”内部调用此广播。 - kavya

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- kavya · Accepted Answer

嘿，试试使用动态调用广播，我尝试过了，肯定会起作用的...

public class MainActivity extends Activity {

    //Create broadcast object
    BroadcastReceiver mybroadcast = new BroadcastReceiver() {    
        //When Event is published, onReceive method is called
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            Log.i("[BroadcastReceiver]", "MyReceiver");

            if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
                Log.i("[BroadcastReceiver]", "Screen ON");
            }
            else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
                Log.i("[BroadcastReceiver]", "Screen OFF");
            }

        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        registerReceiver(mybroadcast, new IntentFilter(Intent.ACTION_SCREEN_ON));
        registerReceiver(mybroadcast, new IntentFilter(Intent.ACTION_SCREEN_OFF));
    }
}