Example usage for android.text TextWatcher TextWatcher

List of usage examples for android.text TextWatcher TextWatcher

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Introduction

In this page you can find the example usage for android.text TextWatcher TextWatcher.

Prototype

TextWatcher

Source Link

Usage

From source file:com.example.feedback.ActivityFeedback.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_feedback);

    // Set action bar title to Feedback.
    actionBar = getActionBar();//from  w w  w .  jav a  2  s . co m
    actionBar.setTitle(getResources().getString(R.string.title_feedback));

    // Set views.
    spinnerFrom = (Spinner) findViewById(R.id.spinner_from);
    inputText = (EditText) findViewById(R.id.input_test);
    checkScreen = (CheckBox) findViewById(R.id.check_screen);
    layoutScreen = (LinearLayout) findViewById(R.id.layout_screen);
    imageCrop = (ImageView) findViewById(R.id.image_crop);
    textPreview = (TextView) findViewById(R.id.text_preview);

    // Get screenshot from previous activity.
    getScreen();

    // Get device account(s) for spinner (select primary by default).
    getAccounts();
    spinnerFrom.setAdapter(accountAdapter);
    spinnerFrom.setSelection(1);

    // Set feedback to include screenshot/logs by default.
    checkScreen.setChecked(true);

    // Set text listener for feedback text.
    inputText.addTextChangedListener(new TextWatcher() {
        public void afterTextChanged(Editable s) {
        }

        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        public void onTextChanged(CharSequence s, int start, int before, int count) {
            if (s.length() > 0) {
                menuActionBar.findItem(R.id.action_send_disabled).setVisible(false);
                menuActionBar.findItem(R.id.action_send_enabled).setVisible(true);
            } else {
                menuActionBar.findItem(R.id.action_send_disabled).setVisible(true);
                menuActionBar.findItem(R.id.action_send_enabled).setVisible(false);
            }
        }
    });

    // Set click listener for checkbox.
    checkScreen.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (checkScreen.isChecked()) {
                layoutScreen.setVisibility(View.VISIBLE);
            } else {
                layoutScreen.setVisibility(View.INVISIBLE);
            }
        }
    });

    // Set click listener for screenshot image.
    imageCrop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            displayScreen();
        }
    });
}

From source file:com.kerkr.edu.editView.FloatLabelLayout.java

private void setEditText(EditText editText) {
    // If we already have an EditText, throw an exception
    if (mEditText != null) {
        throw new IllegalArgumentException("We already have an EditText, can only have one");
    }/*from  w ww  . j a  v  a 2  s  .c o m*/
    mEditText = editText;

    // Update the label visibility with no animation
    updateLabelVisibility(false);

    mEditText.setOnFocusChangeListener(new OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            // TODO Auto-generated method stub

        }
    });
    // Add a TextWatcher so that we know when the text input has changed
    mEditText.addTextChangedListener(new TextWatcher() {
        @Override
        public void afterTextChanged(Editable s) {
            updateLabelVisibility(true);
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }
    });

    // Add focus listener to the EditText so that we can notify the label that it is activated.
    // Allows the use of a ColorStateList for the text color on the label
    mEditText.setOnFocusChangeListener(new OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean focused) {
            updateLabelVisibility(true);
        }
    });

    // If we do not have a valid hint, try and retrieve it from the EditText
    if (TextUtils.isEmpty(mHint)) {
        setHint(mEditText.getHint());
    }
}

From source file:com.google.samples.apps.topeka.fragment.SignInFragment.java

private void initContentViews(View view) {
    TextWatcher textWatcher = new TextWatcher() {
        @Override//from  w  w  w.  j a v  a2s  . c  om
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            /* no-op */
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // hiding the floating action button if text is empty
            if (s.length() == 0) {
                mDoneFab.hide();
            }
        }

        @Override
        public void afterTextChanged(Editable s) {
            // showing the floating action button if avatar is selected and input data is valid
            if (isAvatarSelected() && isInputDataValid()) {
                mDoneFab.show();
            }
        }
    };

    mFirstName = (EditText) view.findViewById(R.id.first_name);
    mFirstName.addTextChangedListener(textWatcher);
    mLastInitial = (EditText) view.findViewById(R.id.last_initial);
    mLastInitial.addTextChangedListener(textWatcher);
    mDoneFab = (FloatingActionButton) view.findViewById(R.id.done);
    mDoneFab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
            case R.id.done:
                savePlayer(getActivity());
                removeDoneFab(new Runnable() {
                    @Override
                    public void run() {
                        if (null == mSelectedAvatarView) {
                            performSignInWithTransition(mAvatarGrid.getChildAt(mSelectedAvatar.ordinal()));
                        } else {
                            performSignInWithTransition(mSelectedAvatarView);
                        }
                    }
                });
                break;
            default:
                throw new UnsupportedOperationException("The onClick method has not been implemented for "
                        + getResources().getResourceEntryName(v.getId()));
            }
        }
    });
}

From source file:com.bloodtolife.bloodapp.CommentsFragment.java

@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);
    db = new SQLiteHandler(getActivity());

    RecyclerView mCommentsView = (RecyclerView) rootView.findViewById(R.id.comment_list);
    mEditText = (EditText) rootView.findViewById(R.id.editText);
    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//ww  w  .  j  ava 2s  . c  o  m
        protected void populateViewHolder(final CommentViewHolder viewHolder, Comment comment, int position) {
            user_ = db.getUserDetails();
            viewHolder.commentAuthor.setText(user_.get("name"));
            GlideUtil.loadProfileIcon(user_.get("profile_pic_url"), viewHolder.commentPhoto);

            viewHolder.authorRef = user_.get("uid");
            viewHolder.commentTime.setText(DateUtils.getRelativeTimeSpanString((long) comment.getTimestamp()));
            viewHolder.commentText.setText(comment.getText());
        }
    };
    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();
            mEditText.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();
            }

            Comment comment = new Comment(user.getDisplayName(), 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;
}

From source file:com.jins_meme.bridge.OSCConfigFragment.java

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    handler = new Handler();

    layout = (LinearLayout) view.findViewById(R.id.osc_layout);
    layout.setOnTouchListener(new OnTouchListener() {
        @Override/* w ww .  j a va 2 s. com*/
        public boolean onTouch(View view, MotionEvent motionEvent) {
            Log.d("DEBUG", "view touch.");

            layout.requestFocus();

            return false;
        }
    });

    InputFilter[] filters = new InputFilter[1];
    filters[0] = new InputFilter() {
        @Override
        public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart,
                int dend) {
            if (end > start) {
                String destTxt = dest.toString();
                String resultingTxt = destTxt.substring(0, dstart) + source.subSequence(start, end)
                        + destTxt.substring(dend);
                if (!resultingTxt
                        .matches("^\\d{1,3}(\\." + "(\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3})?)?)?)?)?)?")) {
                    return "";
                } else {
                    String[] splits = resultingTxt.split("\\.");
                    for (String split : splits) {
                        if (Integer.valueOf(split) > 255) {
                            return "";
                        }
                    }
                }
            }
            return null;
        }
    };

    etRemoteIP = (EditText) view.findViewById(R.id.remote_ip);
    String savedRemoteIP = ((MainActivity) getActivity()).getSavedValue("REMOTE_IP", "255.255.255.255");
    if (savedRemoteIP.equals("255.255.255.255")) {
        etRemoteIP.setText(MemeOSC.getRemoteIPv4Address());
    } else {
        etRemoteIP.setText(savedRemoteIP);
    }
    etRemoteIP.setFilters(filters);
    etRemoteIP.setOnFocusChangeListener(new OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            if (!b) {
                InputMethodManager imm = (InputMethodManager) getActivity()
                        .getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
            }
        }
    });
    etRemoteIP.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) {
            Log.d("DEBUG", "after text changed " + editable.toString());

            ((MainActivity) getActivity()).autoSaveValue("REMOTE_IP", editable.toString());

            testOSC.setRemoteIP(etRemoteIP.getText().toString());
            testOSC.initSocket();
        }
    });

    etRemotePort = (EditText) view.findViewById(R.id.remote_port);
    etRemotePort.setText(String.valueOf(((MainActivity) getActivity()).getSavedValue("REMOTE_PORT", 10316)));
    etRemotePort.setOnFocusChangeListener(new OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            if (!b) {
                InputMethodManager imm = (InputMethodManager) getActivity()
                        .getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
            }
        }
    });
    etRemotePort.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) {
            Log.d("DEBUG", "after text changed " + editable.toString());

            if (editable.toString().length() > 0) {
                ((MainActivity) getActivity()).autoSaveValue("REMOTE_PORT",
                        Integer.valueOf(editable.toString()));

                testOSC.setRemotePort(Integer.parseInt(editable.toString()));
                testOSC.initSocket();
            }
        }
    });

    etHostIP = (EditText) view.findViewById(R.id.host_ip);
    etHostIP.setText(MemeOSC.getHostIPv4Address());
    etHostIP.setEnabled(false);

    etHostPort = (EditText) view.findViewById(R.id.host_port);
    etHostPort.setText(String.valueOf(((MainActivity) getActivity()).getSavedValue("HOST_PORT", 11316)));
    etHostPort.setOnFocusChangeListener(new OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            if (!b) {
                InputMethodManager imm = (InputMethodManager) getActivity()
                        .getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
            }
        }
    });
    etHostPort.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) {
            Log.d("DEBUG", "after text changed " + editable.toString());

            if (editable.toString().length() > 0) {
                ((MainActivity) getActivity()).autoSaveValue("HOST_PORT", Integer.valueOf(editable.toString()));
                testOSC.setHostPort(Integer.parseInt(editable.toString()));
                testOSC.initSocket();
            }
        }
    });

    btnTest = (Button) view.findViewById(R.id.remote_test);
    btnTest.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {
            layout.requestFocus();

            testOSC.setAddress("/meme/bridge", "/test");
            testOSC.setTypeTag("si");
            testOSC.addArgument(etRemoteIP.getText().toString());
            testOSC.addArgument(Integer.parseInt(etRemotePort.getText().toString()));
            testOSC.flushMessage();
        }
    });

    testOSC = new MemeOSC();
    testOSC.setRemoteIP(etRemoteIP.getText().toString());
    testOSC.setRemotePort(Integer.parseInt(etRemotePort.getText().toString()));
    testOSC.setHostPort(Integer.parseInt(etHostPort.getText().toString()));
    testOSC.initSocket();

    isShown = true;
    Thread rcvTestThread = new Thread(new ReceiveTestTRunnable());
    rcvTestThread.start();
}

From source file:com.example.nitish.welcomapp.activitypt.ElementListFragment.java

/**
 * Setup the listener for the filtering TextView.
 *///from ww  w . j a v a  2  s.com
private void setupFilter() {
    final EditText filterEditText = (EditText) getActivity().findViewById(R.id.filter);
    filterEditText.addTextChangedListener(new TextWatcher() {
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

        public void afterTextChanged(Editable s) {
            mFilter = s.toString();
            mAdapter.getFilter().filter(mFilter);
        }
    });
}

From source file:com.justplay1.shoppist.features.search.SearchFragment.java

@Override
protected void init(View view) {
    adapter = new SearchAdapter(getContext(), contextType);
    adapter.setClickListener(this);

    searchView.setAdapter(adapter);/*from  ww  w  . ja  v  a2 s .c  o  m*/
    updateNavigationIcon();
    searchView.showIcon(true);
    searchView.setOnIconClickListener(this);
    searchView.setOnSearchListener(this);
    searchView.setOnMenuItemClickListener(this);
    searchView.setOnSearchFocusChangedListener(this);
    searchView.setOnContainerTouchClickListener(this);
    searchView.setText(null);
    searchView.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence query, int start, int before, int count) {
            showVoiceButton(query.length() == 0 && searchView.isActivated());
            showClearButton(query.length() > 0 && searchView.isActivated());
            search(query.toString());
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });
    searchView.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
        @Override
        public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop,
                int oldRight, int oldBottom) {
            searchView.removeOnLayoutChangeListener(this);
            searchView.setActivated(true);
            presenter.attachView(SearchFragment.this);
        }
    });
    searchView.setHint(getString(R.string.search));
}

From source file:com.meetingninja.csse.agenda.AgendaItemAdapter.java

@Override
public LinearLayout updateView(final View view, final TreeNodeInfo<Topic> treeNodeInfo) {

    final LinearLayout rowView = (LinearLayout) view;

    final Topic rowTopic = treeNodeInfo.getId();

    // System.out.println("Echo: Checked" + rowTopic + " " + counter + " "
    // + Comparison.size() + " " + checked);

    final EditText mTitle = (EditText) rowView.findViewById(R.id.agenda_edit_topic);

    final TextView mTime = (TextView) rowView.findViewById(R.id.agenda_topic_time);
    if (textHandlers.containsKey(mTitle)) {
        mTitle.removeTextChangedListener(textHandlers.get(mTitle));
    }// w  w w. j  a  va  2  s.co  m
    mTitle.setText(rowTopic.getTitle());

    // System.out.println("Echo: Here" + rowTopic.getTitle() + " " +
    // rowView);

    TextWatcher c = new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            String text = s.toString();

            // rowTopic.setTitle(text);
            mTitle.setTag(text);
            rowTopic.setTitle(text);

            Log.d(TAG, "Text changed" + treeNodeInfo.getLevel() + " " + treeNodeInfo.getId());
            manager.getChildren(treeNodeInfo.getId());

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    };

    mTitle.addTextChangedListener(c);
    textHandlers.put(mTitle, c);

    final Button mAddTopicBtn = (Button) rowView.findViewById(R.id.agenda_subtopicAddBtn);
    final Button mTimeBtn = (Button) rowView.findViewById(R.id.agenda_topicTimeBtn);
    System.out.println();

    // Add SubTopic Button
    // mAddTopicBtn.setTag(rowTopic);
    mAddTopicBtn.setOnClickListener(new SubTopicListener(rowTopic));

    // Set Time Button
    mTimeBtn.setTag(rowTopic);
    mTimeBtn.setOnClickListener(new OnTimeBtnClick(rowTopic, mTime));

    Map<String, String> info = getDescription(rowTopic);

    String time = info.containsKey("time") ? info.get("time") : "";
    time = "(" + rowTopic.getTime() + "m)";
    mTime.setText(time);

    // If a topic has subTopics, then its time is determined by the sum of
    // the subTopics
    if (getManager().getChildren(rowTopic).size() != 0) {
        // mTimeBtn.setVisibility(View.GONE);
        mTime.setVisibility(View.GONE);
        mTimeBtn.setVisibility(View.GONE);
    } else {
        mTime.setVisibility(View.VISIBLE);
        mTimeBtn.setVisibility(View.VISIBLE);
        // timeBtn.setChecked(selected.contains(treeNodeInfo.getId()));
    }
    getManager().notifyDataSetChanged();
    return rowView;
}

From source file:com.example.naveen.dentalorder.ui.CustomerInfoFragment.java

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    mDrNameView.addTextChangedListener(new TextWatcher() {
        @Override//from   www.j  av  a 2  s.  c o m
        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) {
            mPage.getData().putString(CustomerInfoPage.DR_NAME_DATA_KEY,
                    (editable != null) ? editable.toString() : null);
            mPage.notifyDataChanged();
        }
    });

    mNameView.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) {
            mPage.getData().putString(CustomerInfoPage.NAME_DATA_KEY,
                    (editable != null) ? editable.toString() : null);
            mPage.notifyDataChanged();
        }
    });

    mAgeView.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) {
            mPage.getData().putString(CustomerInfoPage.AGE_DATA_KEY,
                    (editable != null) ? editable.toString() : null);
            mPage.notifyDataChanged();
        }
    });

    mDateSend.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) {
            mPage.getData().putString(CustomerInfoPage.DATE_SEND_DATA_KEY,
                    (editable != null) ? editable.toString() : null);
            mPage.notifyDataChanged();
        }
    });

    mDateRequired.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) {
            mPage.getData().putString(CustomerInfoPage.DATE_REQ_DATA_KEY,
                    (editable != null) ? editable.toString() : null);
            mPage.notifyDataChanged();
        }
    });

    mMale.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            mPage.getData().putString(CustomerInfoPage.SEX_DATA_KEY, (isChecked ? "Male" : "Female"));
            mPage.notifyDataChanged();
        }
    });

    mFemale.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            mPage.getData().putString(CustomerInfoPage.SEX_DATA_KEY, (isChecked ? "Female" : "Male"));
            mPage.notifyDataChanged();
        }
    });
}

From source file:com.google.firebase.codelab.friendlychat.ui.messages.MessagesActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Initialize ProgressBar and RecyclerView.
    mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
    mMessageRecyclerView = (RecyclerView) findViewById(R.id.messageRecyclerView);
    mLinearLayoutManager = new LinearLayoutManager(this);
    mLinearLayoutManager.setStackFromEnd(true);
    mMessageRecyclerView.setLayoutManager(mLinearLayoutManager);

    FirebaseDatabase.getInstance().setPersistenceEnabled(true);

    mFirebaseDatabaseReference = FirebaseDatabase.getInstance().getReference();
    mFirebaseAdapter = new FirebaseRecyclerAdapter<FriendlyMessage, MessageViewHolder>(FriendlyMessage.class,
            R.layout.item_message, MessageViewHolder.class, mFirebaseDatabaseReference.child(MESSAGES_CHILD)) {

        @Override//w  w  w  .j  a va 2  s  .co  m
        protected void populateViewHolder(MessageViewHolder viewHolder, FriendlyMessage friendlyMessage,
                int position) {
            mProgressBar.setVisibility(ProgressBar.INVISIBLE);
            viewHolder.bind(friendlyMessage);
        }
    };

    mFirebaseAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
        @Override
        public void onItemRangeInserted(int positionStart, int itemCount) {
            super.onItemRangeInserted(positionStart, itemCount);
            int friendlyMessageCount = mFirebaseAdapter.getItemCount();
            int lastVisiblePosition = mLinearLayoutManager.findLastCompletelyVisibleItemPosition();
            // If the recycler view is initially being loaded or the
            // user is at the bottom of the list, scroll to the bottom
            // of the list to show the newly added message.
            if (lastVisiblePosition == -1 || (positionStart >= (friendlyMessageCount - 1)
                    && lastVisiblePosition == (positionStart - 1))) {
                mMessageRecyclerView.scrollToPosition(positionStart);
            }
        }
    });

    mMessageRecyclerView.setLayoutManager(mLinearLayoutManager);
    mMessageRecyclerView.setAdapter(mFirebaseAdapter);

    mMessageEditText = (EditText) findViewById(R.id.messageEditText);

    mMessageEditText.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) {
            if (charSequence.toString().trim().length() > 0) {
                mSendButton.setEnabled(true);
            } else {
                mSendButton.setEnabled(false);
            }
        }

        @Override
        public void afterTextChanged(Editable editable) {
        }
    });

    mSendButton = (Button) findViewById(R.id.sendButton);
    mSendButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            FriendlyMessage friendlyMessage = new FriendlyMessage(mMessageEditText.getText().toString(),
                    mUsername, mPhotoUrl);
            mFirebaseDatabaseReference.child(MESSAGES_CHILD).push().setValue(friendlyMessage);
            mMessageEditText.setText("");
        }
    });

}