Java tutorial
/** * Copyright Google Inc. All Rights Reserved. * <p/> * 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 * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * 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.daul.chat; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.annotation.NonNull; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; 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.util.Log; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast; import com.bumptech.glide.Glide; import com.firebase.ui.database.FirebaseRecyclerAdapter; import com.google.android.gms.ads.AdRequest; import com.google.android.gms.ads.AdView; import com.google.android.gms.appinvite.AppInvite; import com.google.android.gms.appinvite.AppInviteInvitation; import com.google.android.gms.auth.api.Auth; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.api.GoogleApiClient; import com.google.android.gms.tasks.OnFailureListener; import com.google.android.gms.tasks.OnSuccessListener; import com.google.firebase.analytics.FirebaseAnalytics; import com.google.firebase.auth.FirebaseAuth; import com.google.firebase.auth.FirebaseUser; import com.google.firebase.crash.FirebaseCrash; import com.google.firebase.database.DatabaseReference; import com.google.firebase.database.FirebaseDatabase; import com.google.firebase.remoteconfig.FirebaseRemoteConfig; import com.google.firebase.remoteconfig.FirebaseRemoteConfigSettings; import java.util.HashMap; import java.util.Map; import de.hdodenhof.circleimageview.CircleImageView; public class MainActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener { public static class MessageViewHolder extends RecyclerView.ViewHolder { public TextView messageTextView; public TextView messengerTextView; public CircleImageView messengerImageView; public MessageViewHolder(View v) { super(v); messageTextView = (TextView) itemView.findViewById(R.id.messageTextView); messengerTextView = (TextView) itemView.findViewById(R.id.messengerTextView); messengerImageView = (CircleImageView) itemView.findViewById(R.id.messengerImageView); } } private static final String TAG = "MainActivity"; public static final String MESSAGES_CHILD = "messages"; private static final int REQUEST_INVITE = 1; public static final int DEFAULT_MSG_LENGTH_LIMIT = 10; public static final String ANONYMOUS = "anonymous"; private static final String MESSAGE_SENT_EVENT = "message_sent"; private String mUsername; private String mPhotoUrl; private SharedPreferences mSharedPreferences; private GoogleApiClient mGoogleApiClient; private Button mSendButton; private RecyclerView mMessageRecyclerView; private LinearLayoutManager mLinearLayoutManager; private ProgressBar mProgressBar; private EditText mMessageEditText; // Firebase instance variables private FirebaseAuth mFirebaseAuth; private FirebaseUser mFirebaseUser; private DatabaseReference mFirebaseDatabaseReference; private FirebaseRecyclerAdapter<FriendlyMessage, MessageViewHolder> mFirebaseAdapter; private FirebaseRemoteConfig mFirebaseRemoteConfig; private FirebaseAnalytics mFirebaseAnalytics; private AdView mAdView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); // Set default username is anonymous. mUsername = ANONYMOUS; mFirebaseAuth = FirebaseAuth.getInstance(); mFirebaseUser = mFirebaseAuth.getCurrentUser(); if (mFirebaseUser == null) { // Not signed in, launch the Sign In activity startActivity(new Intent(this, SignInActivity.class)); finish(); return; } else { mUsername = mFirebaseUser.getDisplayName(); if (mFirebaseUser.getPhotoUrl() != null) { mPhotoUrl = mFirebaseUser.getPhotoUrl().toString(); } } mGoogleApiClient = new GoogleApiClient.Builder(this) .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */) .addApi(Auth.GOOGLE_SIGN_IN_API).addApi(AppInvite.API).build(); // 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); mProgressBar.setVisibility(ProgressBar.INVISIBLE); //Initialize Firebase Analytics. mFirebaseAnalytics = FirebaseAnalytics.getInstance(this); //Initialize Firebase Remote Config. mFirebaseRemoteConfig = FirebaseRemoteConfig.getInstance(); // Define Firebase Remote Config Settings. FirebaseRemoteConfigSettings firebaseRemoteConfigSettings = new FirebaseRemoteConfigSettings.Builder() .setDeveloperModeEnabled(true).build(); // Define default config values. Defaults are used when fetched config values are not // available. Eg: if an error occurred fetching values from the server. Map<String, Object> defaultConfigMap = new HashMap<>(); defaultConfigMap.put("friendly_msg_length", 10L); // Apply config settings and default values. mFirebaseRemoteConfig.setConfigSettings(firebaseRemoteConfigSettings); mFirebaseRemoteConfig.setDefaults(defaultConfigMap); // Fetch remote config. fetchConfig(); // New child entries mFirebaseDatabaseReference = FirebaseDatabase.getInstance().getReference(); mFirebaseAdapter = new FirebaseRecyclerAdapter<FriendlyMessage, MessageViewHolder>(FriendlyMessage.class, R.layout.item_message, MessageViewHolder.class, mFirebaseDatabaseReference.child(MESSAGES_CHILD)) { @Override protected void populateViewHolder(MessageViewHolder viewHolder, FriendlyMessage friendlyMessage, int position) { mProgressBar.setVisibility(ProgressBar.INVISIBLE); viewHolder.messageTextView.setText(friendlyMessage.getText()); viewHolder.messengerTextView.setText(friendlyMessage.getName()); if (friendlyMessage.getPhotoUrl() == null) { viewHolder.messengerImageView.setImageDrawable( ContextCompat.getDrawable(MainActivity.this, R.drawable.ic_account_circle_black_36dp)); } else { Glide.with(MainActivity.this).load(friendlyMessage.getPhotoUrl()) .into(viewHolder.messengerImageView); } } }; 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 (lastVisiblePosition == -1 || (positionStart >= (friendlyMessageCount - 1) && lastVisiblePosition == (positionStart - 1))) { mMessageRecyclerView.scrollToPosition(positionStart); } } }); mMessageRecyclerView.setLayoutManager(mLinearLayoutManager); mMessageRecyclerView.setAdapter(mFirebaseAdapter); mMessageEditText = (EditText) findViewById(R.id.messageEditText); mMessageEditText.setFilters(new InputFilter[] { new InputFilter.LengthFilter( mSharedPreferences.getInt(CodelabPreferences.FRIENDLY_MSG_LENGTH, DEFAULT_MSG_LENGTH_LIMIT)) }); 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) { // Send messages on click. FriendlyMessage friendlyMessage = new FriendlyMessage(mMessageEditText.getText().toString(), mUsername, mPhotoUrl); mFirebaseDatabaseReference.child(MESSAGES_CHILD).push().setValue(friendlyMessage); mMessageEditText.setText(""); } }); mAdView = (AdView) findViewById(R.id.adView); AdRequest adRequest = new AdRequest.Builder().build(); mAdView.loadAd(adRequest); } @Override public void onStart() { super.onStart(); // Check if user is signed in. // TODO: Add code to check if user is signed in. } @Override public void onPause() { if (mAdView != null) { mAdView.pause(); } super.onPause(); } /** Called when returning to the activity */ @Override public void onResume() { super.onResume(); if (mAdView != null) { mAdView.resume(); } } /** Called before the activity is destroyed */ @Override public void onDestroy() { if (mAdView != null) { mAdView.destroy(); } super.onDestroy(); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.sign_out_menu: mFirebaseAuth.signOut(); Auth.GoogleSignInApi.signOut(mGoogleApiClient); mUsername = ANONYMOUS; startActivity(new Intent(this, SignInActivity.class)); return true; case R.id.fresh_config_menu: fetchConfig(); return true; case R.id.invite_menu: sendInvitation(); return true; case R.id.crash_menu: FirebaseCrash.logcat(Log.ERROR, TAG, "crash caused"); causeCrash(); return true; default: return super.onOptionsItemSelected(item); } } private void causeCrash() { throw new NullPointerException("Fake null pointer exception"); } @Override public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { // An unresolvable error has occurred and Google APIs (including Sign-In) will not // be available. Log.d(TAG, "onConnectionFailed:" + connectionResult); Toast.makeText(this, "Google Play Services error.", Toast.LENGTH_SHORT).show(); } // Fetch the config to determine the allowed length of messages. public void fetchConfig() { long cacheExpiration = 3600; // 1 hour in seconds // If developer mode is enabled reduce cacheExpiration to 0 so that // each fetch goes to the server. This should not be used in release // builds. if (mFirebaseRemoteConfig.getInfo().getConfigSettings().isDeveloperModeEnabled()) { cacheExpiration = 0; } mFirebaseRemoteConfig.fetch(cacheExpiration).addOnSuccessListener(new OnSuccessListener<Void>() { @Override public void onSuccess(Void aVoid) { // Make the fetched config available via // FirebaseRemoteConfig get<type> calls. mFirebaseRemoteConfig.activateFetched(); applyRetrievedLengthLimit(); } }).addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { // There has been an error fetching the config Log.w(TAG, "Error fetching config: " + e.getMessage()); applyRetrievedLengthLimit(); } }); } /** * Apply retrieved length limit to edit text field. * This result may be fresh from the server or it may be from cached * values. */ private void applyRetrievedLengthLimit() { Long friendly_msg_length = mFirebaseRemoteConfig.getLong("friendly_msg_length"); mMessageEditText .setFilters(new InputFilter[] { new InputFilter.LengthFilter(friendly_msg_length.intValue()) }); Log.d(TAG, "FML is: " + friendly_msg_length); } private void sendInvitation() { Intent intent = new AppInviteInvitation.IntentBuilder(getString(R.string.invitation_title)) .setMessage(getString(R.string.invitation_message)) .setCallToActionText(getString(R.string.invitation_cta)).build(); startActivityForResult(intent, REQUEST_INVITE); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); Log.d(TAG, "onActivityResult: requestCode=" + requestCode + ", resultCode=" + resultCode); if (requestCode == REQUEST_INVITE) { if (resultCode == RESULT_OK) { Bundle payload = new Bundle(); payload.putString(FirebaseAnalytics.Param.VALUE, "sent"); mFirebaseAnalytics.logEvent(FirebaseAnalytics.Event.SHARE, payload); // Check how many invitations were sent. String[] ids = AppInviteInvitation.getInvitationIds(resultCode, data); Log.d(TAG, "Invitations sent: " + ids.length); } else { Bundle payload = new Bundle(); payload.putString(FirebaseAnalytics.Param.VALUE, "not sent"); mFirebaseAnalytics.logEvent(FirebaseAnalytics.Event.SHARE, payload); // Sending failed or it was canceled, show failure message to // the user Log.d(TAG, "Failed to send invitation."); } } } }