广播接收器的时间过长，以收到的onReceive（）后，飞行模式关闭/开启 [英] Broadcast Receiver is taking too long to receive in onReceive() after airplane mode turned off/on

问题描述

我创建了一个简单的广播接收器和它的工作只是如果我打开/关闭飞行模式，它走了近2分钟，接收使用的onReceive方法广播消息精绝。另一件事是只有这导致一个问题，如果我们启动应用程序，然后如果我改变飞行模式（开/关），然后它太长收到消息。

I have created a simple Broadcast Receiver and it working absolutely fine except that if i turned on/off the Air Plane Mode, it is taking nearly 2 minutes to receive the broadcasted messages using onReceive method. Another thing is only this is causing a problem if we launch the application and then if i change Air plane Mode (on/off), Then it taking too long to receive the message.

的 如果有启动应用程序前的模式改变并没有影响到接收的onReceive方法的消息的时间。的

If there is Mode change before launching the application it didn't affect the time to receive the message in onReceive method.

来源$ C ​​$ C如下。

Source code is below.

的Andr​​oidManifest.xml 的

AndroidManifest.xml

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

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.broadcastreceiver.BroadcastReceiverActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

       <receiver android:name="MyBroadcastReceiver" >
            <intent-filter>
                <action android:name="test.intent.action.QR_CODE_RECEIVER" />
            </intent-filter>
        </receiver>
    </application>

</manifest>

BroadcastReceiverActivity.java 的

BroadcastReceiverActivity.java

public class BroadcastReceiverActivity extends Activity {

    public static String qrCodeReceiver = "test.intent.action.QR_CODE_RECEIVER";

    @Override
    protected void onCreate(Bundle saveInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button broadcastBtn = (Button) findViewById(R.id.broadcastBtn);
        broadcastBtn.setOnClickListener(new View.onClickListener(){
            public void onClick(View v){
                //TODO
                Intent intent = new Intent();
                intent.putExtra("message","Testing");
                intent.setAction(qrCodeReceiver);
                sendBroadcast(intent);
                Log.d("Test","sendBroadcasting the message ::");
            }
        });
    }
}

MyBroadcastReceiver.java 的

MyBroadcastReceiver.java

public class MyBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        //TODO
        Toast.makeText(context, "on receive.",Toast.LENGTH_LONG).show();
        Bundle extras = intent.getExtras();
        String state = extras.getString("message");
        Log.d("Test", "Inside MyBroadcastReceiver onReceive() state :: "+ state);
        Toast.makeText(context, state,Toast.LENGTH_LONG).show();
    }
}

的main.xml 的

main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".BroadcastReceiverActivity" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/hello_world" />

<Button
    android:id="@+id/broadcastBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView1"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="48dp"
    android:text="Send The BroadCast Message" />

</RelativeLayout>

感谢您提前。

推荐答案

在Android系统，广播的内部处理。

In Android System, broadcast are processed internally.

有时，由于系统负载/重启/高运行时，广播接收器获取的时间来接受一些意图

Sometimes, due to system loading/ restart/ high runtime, the broadcast receiver gets time to receive some intent

解决方法是，以标志FLAG_RECEIVER_FOREGROUND添加到意向发送广播

Workaround is, to add Flag FLAG_RECEIVER_FOREGROUND to intent sending broadcast

intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);

这将加快广播传输比以前要在问题方案

This will speed up the broadcast delivery much than before in problem scenario

这篇关于广播接收器的时间过长，以收到的onReceive（）后，飞行模式关闭/开启的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！