我创建了一个简单的广播接收器,它工作得很好,除非我打开/关闭空中飞机模式,使用onReceive方法接收广播消息需要将近2分钟.另一件事是,如果我们启动应用程序然后如果我更改Air plane模式(开/关),则会导致问题,然后接收消息需要很长时间.
如果在启动应用程序之前有模式更改,则不会影响在onReceive方法中接收消息的时间.
源代码如下.
AndroidManifest.xml中
<?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
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
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();
}
}
main.xml中
<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>
先感谢您.
