Java tutorial
/* * Copyright (C) 2015 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package io.techministry.android.fellowshipmissionchurch.ui; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.design.widget.FloatingActionButton; import android.support.v4.app.Fragment; import android.support.v7.app.AlertDialog; import android.support.v7.widget.DefaultItemAnimator; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import com.firebase.ui.database.FirebaseRecyclerAdapter; import com.google.firebase.database.DatabaseReference; import com.google.firebase.database.FirebaseDatabase; import com.google.firebase.database.Query; import io.techministry.android.fellowshipmissionchurch.AnnouncementDetailActivity; import io.techministry.android.fellowshipmissionchurch.PlayerActivity; import io.techministry.android.fellowshipmissionchurch.R; import io.techministry.android.fellowshipmissionchurch.utils.FirebaseUtilities; import io.techministry.android.fellowshipmissionchurch.holder.AnnouncementHolder; import io.techministry.android.fellowshipmissionchurch.models.Announcement; import io.techministry.android.fellowshipmissionchurch.utils.Utilities; public class AnnouncementListFragment extends Fragment { FirebaseDatabase mDatabase; Query mQuery; private FirebaseRecyclerAdapter<Announcement, AnnouncementHolder> mRecyclerViewAdapter; RecyclerView rv; Context context; LinearLayoutManager linearLayoutManager; String TAG = "Announcements"; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); context = getActivity(); // Get an instance of the firebase database mDatabase = FirebaseDatabase.getInstance(); } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_connect, container, false); rv = (RecyclerView) view.findViewById(R.id.recyclerview); setUpRecyclerView(rv); fetchAnnouncementsFromFirebase(); return view; } private void setUpRecyclerView(RecyclerView recycler_view) { recycler_view.setItemAnimator(new DefaultItemAnimator()); linearLayoutManager = new LinearLayoutManager(context); linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL); linearLayoutManager.setSmoothScrollbarEnabled(true); linearLayoutManager.setReverseLayout(true); linearLayoutManager.setStackFromEnd(true); recycler_view.setLayoutManager(linearLayoutManager); } private void fetchAnnouncementsFromFirebase() { DatabaseReference databaseReference = mDatabase.getReference("announcements"); mQuery = databaseReference.orderByKey().limitToFirst(500); // databaseReference.orderByKey().addValueEventListener(new ValueEventListener() { // @Override // public void onDataChange(DataSnapshot dataSnapshot) { // Log.d(TAG,dataSnapshot.getValue().toString()); // } // // @Override // public void onCancelled(DatabaseError databaseError) { // Log.d(TAG,databaseError.toString()); // // } // }); } @Override public void onStart() { super.onStart(); attachRecyclerViewAdapter(); } @Override public void onStop() { super.onStop(); if (mRecyclerViewAdapter != null) { mRecyclerViewAdapter.cleanup(); } } private void attachRecyclerViewAdapter() { mRecyclerViewAdapter = new FirebaseRecyclerAdapter<Announcement, AnnouncementHolder>(Announcement.class, R.layout.adapter_announcement_item, AnnouncementHolder.class, mQuery) { @Override public void populateViewHolder(AnnouncementHolder viewHolder, final Announcement announcement, final int position) { viewHolder.setData(announcement); viewHolder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (announcement.getContent_type().equals("video")) { Intent intent = new Intent(context, PlayerActivity.class); intent.putExtra("video_url", announcement.getVideo_url()); startActivity(intent); } else { Intent intent = new Intent(context, AnnouncementDetailActivity.class); intent.putExtra("announcement", announcement); startActivity(intent); } } }); ImageView imageView = (ImageView) viewHolder.itemView.findViewById(R.id.like); imageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String unique_id = Utilities.getDeviceID(context); DatabaseReference likeReference = getRef(position).child("likes"); DatabaseReference databaseReference = getRef(position); if (FirebaseUtilities.isLiked(context, unique_id, announcement.getLiked())) { FirebaseUtilities.disLikePost(likeReference); databaseReference.child("liked").child(unique_id).setValue(null); } else { FirebaseUtilities.likePost(likeReference); databaseReference.child("liked").child(unique_id).setValue(true); } } }); } }; rv.setAdapter(mRecyclerViewAdapter); } private void viewAnnouncementText(Announcement announcement) { new AlertDialog.Builder(context).setMessage(announcement.getContent()) .setPositiveButton("Done", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }).show(); } }