Java tutorial
/* * Copyright 2016 Google Inc. All Rights Reserved. * * 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 com.polito.dion; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.text.Editable; import android.text.InputFilter; import android.text.TextWatcher; import android.text.format.DateUtils; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.InputMethodManager; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.firebase.ui.database.FirebaseRecyclerAdapter; import com.google.firebase.auth.FirebaseAuth; import com.google.firebase.auth.FirebaseUser; import com.google.firebase.database.DatabaseError; import com.google.firebase.database.DatabaseReference; import com.google.firebase.database.ServerValue; import com.polito.dion.Models.Author; import com.polito.dion.Models.Comment; /** * This fragment shows the comments for a post. * Use the {@link CommentsFragment#newInstance} factory method to * create an instance of this fragment and pass in the Firebase * post key ref as the argument. */ public class CommentsFragment extends Fragment { public static final String TAG = "CommentsFragment"; // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER private static final String POST_REF_PARAM = "post_ref_param"; private static final int DEFAULT_MSG_LENGTH_LIMIT = 256; private EditText mEditText; private EditText mETAddType; private EditText mETAddCost; private RecyclerView.Adapter<CommentViewHolder> mAdapter; private String mPostRef; public CommentsFragment() { // Required empty public constructor } /** * Use this factory method to create a new instance of * this fragment using the provided parameters. * * @param postRef The firebase post ref. * @return A new instance of fragment CommentsFragment. */ public static CommentsFragment newInstance(String postRef) { CommentsFragment fragment = new CommentsFragment(); Bundle args = new Bundle(); args.putString(POST_REF_PARAM, postRef); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { mPostRef = getArguments().getString(POST_REF_PARAM); } else { throw new RuntimeException("You must specify a post reference."); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View rootView = inflater.inflate(R.layout.fragment_comments, container, false); RecyclerView mCommentsView = (RecyclerView) rootView.findViewById(R.id.comment_list); mEditText = (EditText) rootView.findViewById(R.id.editText); mETAddType = (EditText) rootView.findViewById(R.id.etAddType); mETAddCost = (EditText) rootView.findViewById(R.id.etAddCost); final Button sendButton = (Button) rootView.findViewById(R.id.send_comment); final DatabaseReference commentsRef = FirebaseUtil.getCommentsRef().child(mPostRef); mAdapter = new FirebaseRecyclerAdapter<Comment, CommentViewHolder>(Comment.class, R.layout.comment_item, CommentViewHolder.class, commentsRef) { @Override protected void populateViewHolder(final CommentViewHolder viewHolder, Comment comment, int position) { Author author = comment.getAuthor(); viewHolder.commentAuthor.setText(author.getFull_name()); GlideUtil.loadProfileIcon(author.getProfile_picture(), viewHolder.commentPhoto); viewHolder.authorRef = author.getUid(); viewHolder.commentTime.setText(DateUtils.getRelativeTimeSpanString((long) comment.getTimestamp())); viewHolder.commentText.setText(comment.getText()); viewHolder.commentAddType.setText(comment.getAddType()); viewHolder.commentAddCost.setText(comment.getAddCost()); } }; sendButton.setEnabled(false); mEditText.setHint(R.string.new_comment_hint); mEditText.setFilters(new InputFilter[] { new InputFilter.LengthFilter(DEFAULT_MSG_LENGTH_LIMIT) }); mEditText.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void afterTextChanged(Editable editable) { if (editable.length() > 0) { sendButton.setEnabled(true); } else { sendButton.setEnabled(false); } } }); sendButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Clear input box and hide keyboard. final Editable commentText = mEditText.getText(); final Editable commentAddType = mETAddType.getText(); final Editable commentAddCost = mETAddCost.getText(); mEditText.setText(""); mETAddType.setText(""); mETAddCost.setText(""); InputMethodManager inputManager = (InputMethodManager) getActivity() .getSystemService(Context.INPUT_METHOD_SERVICE); inputManager.hideSoftInputFromWindow(mEditText.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser(); if (user == null) { Toast.makeText(getActivity(), R.string.user_logged_out_error, Toast.LENGTH_SHORT).show(); } Author author = new Author(user.getDisplayName(), user.getPhotoUrl().toString(), user.getUid()); Comment comment = new Comment(author, commentAddCost.toString(), commentAddType.toString(), commentText.toString(), ServerValue.TIMESTAMP); commentsRef.push().setValue(comment, new DatabaseReference.CompletionListener() { @Override public void onComplete(DatabaseError error, DatabaseReference firebase) { if (error != null) { Log.w(TAG, "Error posting comment: " + error.getMessage()); Toast.makeText(getActivity(), "Error posting comment.", Toast.LENGTH_SHORT).show(); mEditText.setText(commentText); } } }); } }); mCommentsView.setLayoutManager(new LinearLayoutManager(getActivity())); mCommentsView.setAdapter(mAdapter); return rootView; } @Override public void onDestroy() { super.onDestroy(); if (mAdapter != null && mAdapter instanceof FirebaseRecyclerAdapter) { ((FirebaseRecyclerAdapter) mAdapter).cleanup(); } } public static class CommentViewHolder extends RecyclerView.ViewHolder { public final ImageView commentPhoto; public final TextView commentText; public final TextView commentAddType; public final TextView commentAddCost; public final TextView commentAuthor; public final TextView commentTime; public String authorRef; public CommentViewHolder(View itemView) { super(itemView); commentPhoto = (ImageView) itemView.findViewById(R.id.comment_author_icon); commentText = (TextView) itemView.findViewById(R.id.comment_text); commentAddType = (TextView) itemView.findViewById(R.id.comment_AddType); commentAddCost = (TextView) itemView.findViewById(R.id.comment_AddCost); commentAuthor = (TextView) itemView.findViewById(R.id.comment_name); commentTime = (TextView) itemView.findViewById(R.id.comment_time); itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (authorRef != null) { Context context = v.getContext(); Intent userDetailIntent = new Intent(context, UserDetailActivity.class); userDetailIntent.putExtra(UserDetailActivity.USER_ID_EXTRA_NAME, authorRef); context.startActivity(userDetailIntent); } } }); } } }