Question

我有一个BroadcastReceiver接收发送给Fragment的广播。我正在接收广播，但我如何从Fragment本身调用一个方法？一旦广播到达，我基本上需要更新列表，List＆amp; update方法是Fragment的一部分。

public class FragmentReceiver extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if(action != null && action.equals("AllTasksFragmentUpdate"))
        {
            //
        }
    }
}

注册接收方：

    @Override
public void onCreate(final Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    getActivity().registerReceiver(new FragmentReceiver(), new IntentFilter("AllTasksFragmentUpdate"));
}

如何从片段中调用方法？

Answer 1

您可以通过以下方式实施广播接收器：

import android.app.Fragment;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.content.LocalBroadcastManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.adobe.libs.connectors.R;

public class YourFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater,
                                @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        //Start listening for refresh local file list   LocalBroadcastManager.getInstance(getActivity()).registerReceiver(mYourBroadcastReceiver,
                new IntentFilter(<YOUR INTENT FILTER>));

        return inflater.inflate(R.layout.your_fragment_layout, null, true);
    }

    @Override
    public void onDestroyView() {
        LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(mYourBroadcastReceiver);
    }

    private final BroadcastReceiver mYourBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            // Now you can call all your fragments method here
        }
    };
}

Answer 2

在onReceive（）方法中，您可以通过其标记名称（用于实例化片段的名称）找到您的片段，并调用其公共方法。

<FeatureSet> ... </FeatureSet>

希望这有帮助！

Answer 3

假设您有一个名为MyActivity的Activity，并且在代码中的某个位置，您希望通过名为MyFragment的Fragment接收广播。你可以这样做：

在MyActivity中，使用LocalBroadcastManager通过过滤器进行广播：

String filter = "thisIsForMyFragment";
Intent intent = new Intent(filter); //If you need extra, add: intent.putExtra("extra","something");
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);

在MyFragment中，在onCreateView（）内添加此项以注册接收器：

LocalBroadcastManager.getInstance(getActivity()).registerReceiver(myBroadcastReceiver,
        new IntentFilter("thisIsForMyFragment"));

以下，在MyFragment中（在onCreateView（）之外）创建接收方法以接收广播：

private final BroadcastReceiver myBroadcastReceiver = new BroadcastReceiver()
{
    @Override
    public void onReceive(Context context, android.content.Intent intent) {
        Toast.makeText(getActivity(), "Broadcast received!", Toast.LENGTH_SHORT).show();//Do what you want when the broadcast is received...

    }
};

最后，在MyFragment中添加此项以取消注册接收器onDestroyView：

@Override
public void onDestroyView()
{
    super.onDestroyView();
    LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(myBroadcastReceiver);
}

Answer 4

activity!!.registerReceiver(receiver, IntentFilter(DataKeys.STATUS))

Android Fragment - BroadcastReceiver调用片段方法

4 个答案: