Question

所以，我正试图处理BroadcastReceivers和Intent过滤器。我有一个我在MyActivity中创建的自定义Dialog。在对话框中，我有一个按钮。单击按钮后，我想发送MyActivity接收器将接收的广播。这就是我现在所拥有的：

//MyActivity.java
class myActivity extends Activity {

    //MyDialog dialog initialized in onCreate

    ...

    private class MyReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            //toast "Broadcast received"
        }
    }
}

//MyDialog.java
class MyDialog extends Dialog {

    //m_context = incoming context from MyActivity

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        Button button1 = (Button)findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnCLickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction("android.intent.action.RUN");
                m_context.sendBroadcast(intent);
            }

        });

    }

}


//AndroidManifest.xml
<activity android:name=".MyActivity" />
<receiver android:name="MyReceiver" android:enabled="true">
    <intent-filter >
        <action android:name="android.intent.action.RUN"/>
    </intent-filter>
</receiver>

当我按下button1时，应用程序崩溃了。任何人都可以带领我朝着正确的方向前进吗？

Answer 1

MyActivity中的

执行以下操作：

private BroadcastReceiver _refreshReceiver = new MyReceiver();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    IntentFilter filter = new IntentFilter("SOMEACTION");
    this.registerReceiver(_refreshReceiver, filter); 
}

@Override
public void onDestroy() {
    super.onDestroy();
    this.unregisterReceiver(this._refreshReceiver);
}

并调用广播

Intent in = new Intent("SOMEACTION");
sendBroadcast(in);

Answer 2

在您的活动的onResume方法中注册接收器可能要容易得多（并且在onPause中取消注册）。

BroadcastReceiver rec = new BroadcastReceiver()
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        //Do stuff
    }
};
IntentFilter filter = new IntentFilter("android.intent.action.RUN");

registerReceiver(rec, filter);

如何从myDialog发送广播（意图）并在myActivity中接收？

2 个答案: