Android初学第93天

Android初学第93天

29_BroadcastIntents

代码

PhotoGallery

NotificationReceiver.java

package com.bignerdranch.android.photogallery;

import android.app.Activity;
import android.app.Notification;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationManagerCompat;
import android.util.Log;

public class NotificationReceiver extends BroadcastReceiver {
    private static final String TAG = "NotificationReceiver";

    @Override
    public void onReceive(Context c, Intent i) {
        Log.i(TAG, "received result: " + getResultCode());
        if (getResultCode() != Activity.RESULT_OK) {
            // A foreground activity cancelled the broadcast
            return;
        }

        int requestCode = i.getIntExtra(PollService.REQUEST_CODE, 0);
        Notification notification = (Notification)
                i.getParcelableExtra(PollService.NOTIFICATION);

        NotificationManagerCompat notificationManager = 
                NotificationManagerCompat.from(c);
        notificationManager.notify(requestCode, notification);
    }
}

VisibleFragment.java

package com.bignerdranch.android.photogallery;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.widget.Toast;

public abstract class VisibleFragment extends Fragment {
    private static final String TAG = "VisibleFragment";

    private BroadcastReceiver mOnShowNotification = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            // If we receive this, we're visible, so cancel
            // the notification
            Log.i(TAG, "canceling notification");
            setResultCode(Activity.RESULT_CANCELED);
        }
    };

    @Override
    public void onStart() {
        super.onStart();
        IntentFilter filter = new IntentFilter(PollService.ACTION_SHOW_NOTIFICATION);
        getActivity().registerReceiver(mOnShowNotification, filter,
                PollService.PERM_PRIVATE, null);
    }

    @Override
    public void onStop() {
        super.onStop();
        getActivity().unregisterReceiver(mOnShowNotification);
    }
}