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 ru.innopolis.architecture.gstar; import android.content.Intent; import android.content.SharedPreferences; import android.net.Uri; 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.ImageView; import android.widget.ProgressBar; import android.widget.TextView; import com.bumptech.glide.Glide; import com.firebase.ui.database.FirebaseRecyclerAdapter; 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.OnCompleteListener; import com.google.android.gms.tasks.OnFailureListener; import com.google.android.gms.tasks.OnSuccessListener; import com.google.android.gms.tasks.Task; import com.google.firebase.analytics.FirebaseAnalytics; import com.google.firebase.appindexing.Action; import com.google.firebase.appindexing.FirebaseAppIndex; import com.google.firebase.appindexing.FirebaseUserActions; import com.google.firebase.appindexing.Indexable; import com.google.firebase.appindexing.builders.Indexables; import com.google.firebase.appindexing.builders.PersonBuilder; import com.google.firebase.auth.FirebaseAuth; import com.google.firebase.auth.FirebaseUser; import com.google.firebase.codelab.friendlychat.R; import com.google.firebase.crash.FirebaseCrash; import com.google.firebase.database.DataSnapshot; import com.google.firebase.database.DatabaseError; 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 com.google.firebase.storage.FirebaseStorage; import com.google.firebase.storage.StorageReference; import com.google.firebase.storage.UploadTask; 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 ImageView messageImageView; public TextView messengerTextView; public CircleImageView messengerImageView; public MessageViewHolder(View v) { super(v); messageTextView = (TextView) itemView.findViewById(R.id.messageTextView); messageImageView = (ImageView) itemView.findViewById(R.id.messageImageView); 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; private static final int REQUEST_IMAGE = 2; public static final int DEFAULT_MSG_LENGTH_LIMIT = 100; public static final String ANONYMOUS = "anonymous"; private static final String MESSAGE_SENT_EVENT = "message_sent"; private static final String MESSAGE_URL = "http://friendlychat.firebase.google.com/message/"; private static final String LOADING_IMAGE_URL = "https://www.google.com/images/spin-32.gif"; private String mUsername; private String mPhotoUrl; private SharedPreferences mSharedPreferences; private Button mSendButton; private RecyclerView mMessageRecyclerView; private LinearLayoutManager mLinearLayoutManager; private FirebaseRecyclerAdapter<FriendlyMessage, MessageViewHolder> mFirebaseAdapter; private ProgressBar mProgressBar; private DatabaseReference mFirebaseDatabaseReference; private FirebaseAuth mFirebaseAuth; private FirebaseUser mFirebaseUser; private FirebaseAnalytics mFirebaseAnalytics; private EditText mMessageEditText; private ImageView mAddMessageImageView; private FirebaseRemoteConfig mFirebaseRemoteConfig; private GoogleApiClient mGoogleApiClient; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); mUsername = ANONYMOUS; // Initialize Firebase Auth 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(); mPhotoUrl = mFirebaseUser.getPhotoUrl().toString(); } mGoogleApiClient = new GoogleApiClient.Builder(this) .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */) .addApi(Auth.GOOGLE_SIGN_IN_API).build(); mProgressBar = (ProgressBar) findViewById(R.id.progressBar); mMessageRecyclerView = (RecyclerView) findViewById(R.id.messageRecyclerView); mLinearLayoutManager = new LinearLayoutManager(this); mLinearLayoutManager.setStackFromEnd(true); mFirebaseDatabaseReference = FirebaseDatabase.getInstance().getReference(); mFirebaseAdapter = new FirebaseRecyclerAdapter<FriendlyMessage, MessageViewHolder>(FriendlyMessage.class, R.layout.item_message, MessageViewHolder.class, mFirebaseDatabaseReference.child(MESSAGES_CHILD)) { @Override protected FriendlyMessage parseSnapshot(DataSnapshot snapshot) { FriendlyMessage friendlyMessage = super.parseSnapshot(snapshot); if (friendlyMessage != null) { friendlyMessage.setId(snapshot.getKey()); } return friendlyMessage; } @Override protected void populateViewHolder(final MessageViewHolder viewHolder, FriendlyMessage friendlyMessage, int position) { mProgressBar.setVisibility(ProgressBar.INVISIBLE); if (friendlyMessage.getText() != null) { viewHolder.messageTextView.setText(friendlyMessage.getText()); viewHolder.messageTextView.setVisibility(TextView.VISIBLE); viewHolder.messageImageView.setVisibility(ImageView.GONE); } else { String imageUrl = friendlyMessage.getImageUrl(); if (imageUrl.startsWith("gs://")) { StorageReference storageReference = FirebaseStorage.getInstance() .getReferenceFromUrl(imageUrl); storageReference.getDownloadUrl().addOnCompleteListener(new OnCompleteListener<Uri>() { @Override public void onComplete(@NonNull Task<Uri> task) { if (task.isSuccessful()) { String downloadUrl = task.getResult().toString(); Glide.with(viewHolder.messageImageView.getContext()).load(downloadUrl) .into(viewHolder.messageImageView); } else { Log.w(TAG, "Getting download url was not successful.", task.getException()); } } }); } else { Glide.with(viewHolder.messageImageView.getContext()).load(friendlyMessage.getImageUrl()) .into(viewHolder.messageImageView); } viewHolder.messageImageView.setVisibility(ImageView.VISIBLE); viewHolder.messageTextView.setVisibility(TextView.GONE); } 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); } if (friendlyMessage.getText() != null) { // write this message to the on-device index FirebaseAppIndex.getInstance().update(getMessageIndexable(friendlyMessage)); } // log a view action on it FirebaseUserActions.getInstance().end(getMessageViewAction(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); // Initialize Firebase Measurement. 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", 100L); // Apply config settings and default values. mFirebaseRemoteConfig.setConfigSettings(firebaseRemoteConfigSettings); mFirebaseRemoteConfig.setDefaults(defaultConfigMap); // Fetch remote config. fetchConfig(); 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) { } }); mAddMessageImageView = (ImageView) findViewById(R.id.addMessageImageView); mAddMessageImageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT); intent.addCategory(Intent.CATEGORY_OPENABLE); intent.setType("image/*"); startActivityForResult(intent, REQUEST_IMAGE); } }); 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, null); mFirebaseDatabaseReference.child(MESSAGES_CHILD).push().setValue(friendlyMessage); mMessageEditText.setText(""); mFirebaseAnalytics.logEvent(MESSAGE_SENT_EVENT, null); } }); } private Action getMessageViewAction(FriendlyMessage friendlyMessage) { return new Action.Builder(Action.Builder.VIEW_ACTION) .setObject(friendlyMessage.getName(), MESSAGE_URL.concat(friendlyMessage.getId())) .setMetadata(new Action.Metadata.Builder().setUpload(false)).build(); } private Indexable getMessageIndexable(FriendlyMessage friendlyMessage) { PersonBuilder sender = Indexables.personBuilder().setIsSelf(mUsername == friendlyMessage.getName()) .setName(friendlyMessage.getName()).setUrl(MESSAGE_URL.concat(friendlyMessage.getId() + "/sender")); PersonBuilder recipient = Indexables.personBuilder().setName(mUsername) .setUrl(MESSAGE_URL.concat(friendlyMessage.getId() + "/recipient")); Indexable messageToIndex = Indexables.messageBuilder().setName(friendlyMessage.getText()) .setUrl(MESSAGE_URL.concat(friendlyMessage.getId())).setSender(sender).setRecipient(recipient) .build(); return messageToIndex; } @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); mFirebaseUser = null; mUsername = ANONYMOUS; mPhotoUrl = null; startActivity(new Intent(this, SignInActivity.class)); return true; default: return super.onOptionsItemSelected(item); } } private void causeCrash() { throw new NullPointerException("Fake null pointer exception"); } 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); } // 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); applyRetrievedLengthLimit(); } }); } @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_IMAGE) { if (resultCode == RESULT_OK) { if (data != null) { final Uri uri = data.getData(); Log.d(TAG, "Uri: " + uri.toString()); FriendlyMessage tempMessage = new FriendlyMessage(null, mUsername, mPhotoUrl, LOADING_IMAGE_URL); mFirebaseDatabaseReference.child(MESSAGES_CHILD).push().setValue(tempMessage, new DatabaseReference.CompletionListener() { @Override public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) { if (databaseError == null) { String key = databaseReference.getKey(); StorageReference storageReference = FirebaseStorage.getInstance() .getReference(mFirebaseUser.getUid()).child(key) .child(uri.getLastPathSegment()); putImageInStorage(storageReference, uri, key); } else { Log.w(TAG, "Unable to write message to database.", databaseError.toException()); } } }); } } } else if (requestCode == REQUEST_INVITE) { if (resultCode == RESULT_OK) { // Use Firebase Measurement to log that invitation was sent. Bundle payload = new Bundle(); payload.putString(FirebaseAnalytics.Param.VALUE, "inv_sent"); // Check how many invitations were sent and log. String[] ids = AppInviteInvitation.getInvitationIds(resultCode, data); Log.d(TAG, "Invitations sent: " + ids.length); } else { // Use Firebase Measurement to log that invitation was not sent Bundle payload = new Bundle(); payload.putString(FirebaseAnalytics.Param.VALUE, "inv_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."); } } } private void putImageInStorage(StorageReference storageReference, Uri uri, final String key) { storageReference.putFile(uri).addOnCompleteListener(MainActivity.this, new OnCompleteListener<UploadTask.TaskSnapshot>() { @Override public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) { if (task.isSuccessful()) { FriendlyMessage friendlyMessage = new FriendlyMessage(null, mUsername, mPhotoUrl, task.getResult().getMetadata().getDownloadUrl().toString()); mFirebaseDatabaseReference.child(MESSAGES_CHILD).child(key).setValue(friendlyMessage); } else { Log.w(TAG, "Image upload task was not successful.", task.getException()); } } }); } /** * 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); } @Override public void onConnectionFailed(ConnectionResult connectionResult) { Log.d(TAG, "onConnectionFailed:" + connectionResult); } }