Android：使用BroadcastReceiver将数据从一个片段传递到另一个片段

Question

I'm trying to send data from a child Fragment to the parent Fragment . I wrote a code for this, but it doesn't seem to work.

Here's the code so far. The following one is declared in the sender's side.

private void sendPINData(String pin) {
    Intent broadcastIntent = new Intent("PINData");
    broadcastIntent.putExtra(Keys.PIN, pin);
    context.sendBroadcast(broadcastIntent);
    getFragmentManager().popBackStack();
}

Next, the receiver's side (parent Fragment )

The following line is in the onCreateView() method.

LocalBroadcastManager.getInstance(getActivity()).registerReceiver(localBroadcastReceiver, new IntentFilter("PINData"));

And this one is the BroadcastReceiver declaration part.

private final BroadcastReceiver localBroadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        if(intent != null) {
            pin = intent.getStringExtra(Keys.PIN);
            Toast.makeText(context, pin, Toast.LENGTH_SHORT).show();
        }
    }
};

Here's the code in the parent Fragment to move to the child Fragment .

                    PINFragment fragment = new PINFragment();
                    FragmentTransaction mTransaction = getFragmentManager().beginTransaction();
                    mTransaction.replace(R.id.main_frame, fragment);
                    mTransaction.addToBackStack(null);
                    mTransaction.commit();

Answer 1

You are using local broadcast to be received (in App score only) but you are sending broadcast as global .. I think you should use LocalBroadcastManager.getInstance(Context ctx) instead of Context to send braodcast. see your code updated below:

private void sendPINData(String pin) {
    Intent broadcastIntent = new Intent("PINData");
    broadcastIntent.putExtra(Keys.PIN, pin);
    LocalBroadcastManager.getInstance(context).sendBroadcast(broadcastIntent);
    getFragmentManager().popBackStack();
}

PS dont forget to unregister receiver as well 🙂

Good luck,'.

Answer 2

private void sendPINData(String pin) {
    Intent broadcastIntent = new Intent("PINData");
    broadcastIntent.putExtra(Keys.PIN, pin);
    LocalBroadcastManager.getInstance(context).sendBroadcast(broadcastIntent);
    getFragmentManager().popBackStack();
}

Try this, please!