Android Fragment - BroadcastReceiver调用片段方法

Question

我有一个 BroadcastReceiver，它接收发送到 Fragment 的广播。我正在接收广播，但如何从 Fragment 本身调用方法？我基本上需要在广播到达后更新一个列表，列表和更新方法是片段的一部分。

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

正在注册接收器：

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

如何从 Fragment 中调用方法？

Answer 1

在你的 onReceive() 方法中，你可以通过它的标签名称（你用来实例化你的片段的名称）找到你的片段并调用它的 public 方法。

SampleFragment fragment = (SampleFragment) getSupportFragmentManager().findFragmentByTag(<fragment_tag_name>);
                if (fragment != null && fragment.isAdded()) {
                    fragment.method(); //Call any public method
                }

希望对您有所帮助！

Answer 2

您可以通过以下方式实现您的广播接收器：

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 3

假设您有一个名为 MyActivity 的 Activity，并且在您的代码中的某个时刻，您想要进行广播以由名为 MyFragment 的 Fragment 接收。你可以这样做：

在 MyActivity 中，使用 LocalBroadcastManager 进行带过滤器的广播：

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() 中添加以下内容以注册接收器：

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

接下来，在MyFragment中（onCreateView()外）创建receiver方法来接收广播：

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 中添加以下代码以在 DestroyView 上注销接收器：

@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

Android Fragment - BroadcastReceiver call fragment method

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android-broadcastreceiver