在Android studio上开发，使用真机模拟，系统是Android8.1.0，在A程序上设置了一个Button，发送标准广播给B程序，应该会收到两条提示信息（“A收到广播”，”B收到广播”），但是只出现了A收到的信息。是按照Android第一行代码这本书5.3.2这节写的代码，但不知道为何不好使。
A程序代码
package="com.example.administrator.myreceiver">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".MyBroadcastReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="com.example.broadcast.MY_BROADCAST"/>
</intent-filter>
</receiver>
</application>
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button=(Button)findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent("com.example.broadcasttest.MY_BROADCAST");
intent.setComponent(new ComponentName("com.example.administrator.myreceiver","com.example.administrator.myreceiver.MyBroadcastReceiver"));//高版本Android发送广播需要加这句
sendBroadcast(intent);
}
});
}
}
public class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// TODO: This method is called when the BroadcastReceiver is receiving
// an Intent broadcast.
//throw new UnsupportedOperationException("Not yet implemented");
Toast.makeText(context, "received in MyBroadcastReceiver", Toast.LENGTH_SHORT).show();
}
}
B程序代码
public class AnotherBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// TODO: This method is called when the BroadcastReceiver is receiving
// an Intent broadcast.
//throw new UnsupportedOperationException("Not yet implemented");
Toast.makeText(context, "received in AnotherBroadcastReceiver", Toast.LENGTH_SHORT).show();
}
}
package="com.example.administrator.brooadcasttest_2">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".AnotherBroadcastReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="com.example.broadcast.MY_BROADCAST"/>
</intent-filter>
</receiver>
</application>
