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.