Examples with ValueEventListener com.google.firebase.database.ValueEventListener used on opensource projects

Example 26 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project quickstart-android by firebase.

the class PostDetailActivity method onStart.

@Override
public void onStart() {
    super.onStart();
    // Add value event listener to the post
    // [START post_value_event_listener]
    ValueEventListener postListener = new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            // Get Post object and use the values to update the UI
            Post post = dataSnapshot.getValue(Post.class);
            // [START_EXCLUDE]
            mAuthorView.setText(post.author);
            mTitleView.setText(post.title);
            mBodyView.setText(post.body);
        // [END_EXCLUDE]
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            // Getting Post failed, log a message
            Log.w(TAG, "loadPost:onCancelled", databaseError.toException());
            // [START_EXCLUDE]
            Toast.makeText(PostDetailActivity.this, "Failed to load post.", Toast.LENGTH_SHORT).show();
        // [END_EXCLUDE]
        }
    };
    mPostReference.addValueEventListener(postListener);
    // [END post_value_event_listener]
    // Keep copy of post listener so we can remove it when app stops
    mPostListener = postListener;
    // Listen for comments
    mAdapter = new CommentAdapter(this, mCommentsReference);
    mCommentsRecycler.setAdapter(mAdapter);
}

Example 27 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project priend by TakoJ.

the class NewPostActivity method submitPost.

private void submitPost() {
    final String title = mTitleField.getText().toString();
    final String body = mBodyField.getText().toString();
    // Title is required
    if (TextUtils.isEmpty(title)) {
        mTitleField.setError(REQUIRED);
        return;
    }
    // Body is required
    if (TextUtils.isEmpty(body)) {
        mBodyField.setError(REQUIRED);
        return;
    }
    // Disable button so there are no multi-posts
    setEditingEnabled(false);
    Toast.makeText(this, "Posting...", Toast.LENGTH_SHORT).show();
    // [START single_value_read]
    final String userId = mAuth.getCurrentUser().getUid();
    mDatabase.child("users").child(userId).addListenerForSingleValueEvent(new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            // Get user value
            User user = dataSnapshot.getValue(User.class);
            // [START_EXCLUDE]
            if (user == null) {
                // User is null, error out
                Log.e(TAG, "User " + userId + " is unexpectedly null");
                Toast.makeText(NewPostActivity.this, "Error: could not fetch user.", Toast.LENGTH_SHORT).show();
            } else {
                // Write new post
                writeNewPost(userId, user.username, title, body);
            }
            // Finish this Activity, back to the stream
            setEditingEnabled(true);
            finish();
        // [END_EXCLUDE]
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.w(TAG, "getUser:onCancelled", databaseError.toException());
            // [START_EXCLUDE]
            setEditingEnabled(true);
        // [END_EXCLUDE]
        }
    });
// [END single_value_read]
}

Example 28 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project priend by TakoJ.

the class PostDetailActivity method onStart.

@Override
public void onStart() {
    super.onStart();
    // Add value event listener to the post
    // [START post_value_event_listener]
    ValueEventListener postListener = new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            // Get Post object and use the values to update the UI
            Post post = dataSnapshot.getValue(Post.class);
            // [START_EXCLUDE]
            mAuthorView.setText(post.author);
            mTitleView.setText(post.title);
            mBodyView.setText(post.body);
        // [END_EXCLUDE]
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            // Getting Post failed, log a message
            Log.w(TAG, "loadPost:onCancelled", databaseError.toException());
            // [START_EXCLUDE]
            Toast.makeText(PostDetailActivity.this, "Failed to load post.", Toast.LENGTH_SHORT).show();
        // [END_EXCLUDE]
        }
    };
    mPostReference.addValueEventListener(postListener);
    // [END post_value_event_listener]
    // Keep copy of post listener so we can remove it when app stops
    mPostListener = postListener;
    // Listen for comments
    mAdapter = new CommentAdapter(this, mCommentsReference);
    mCommentsRecycler.setAdapter(mAdapter);
}

Example 29 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project priend by TakoJ.

the class PostDetailActivity method postComment.

private void postComment() {
    final String uid = mAuth.getCurrentUser().getUid();
    FirebaseDatabase.getInstance().getReference().child("users").child(uid).addListenerForSingleValueEvent(new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            // Get user information
            User user = dataSnapshot.getValue(User.class);
            String authorName = user.username;
            // Create new comment object
            String commentText = mCommentField.getText().toString();
            Comment comment = new Comment(uid, authorName, commentText);
            // Push the comment, it will appear in the list
            mCommentsReference.push().setValue(comment);
            // Clear the field
            mCommentField.setText(null);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
        }
    });
}

Example 30 with ValueEventListener

use of com.google.firebase.database.ValueEventListener in project Robot-Scouter by SUPERCILEX.

the class Scouts method build.

public Task<Map<TeamHelper, List<Scout>>> build() {
    List<Task<Pair<TeamHelper, List<String>>>> scoutIndicesTasks = new ArrayList<>();
    for (TeamHelper helper : mTeamHelpers) {
        TaskCompletionSource<Pair<TeamHelper, List<String>>> scoutIndicesTask = new TaskCompletionSource<>();
        scoutIndicesTasks.add(scoutIndicesTask.getTask());
        getScoutIndicesRef(helper.getTeam().getKey()).addListenerForSingleValueEvent(new ValueEventListener() {

            @Override
            public void onDataChange(DataSnapshot snapshot) {
                AsyncTaskExecutor.Companion.execute(() -> {
                    List<String> scoutKeys = new ArrayList<>();
                    for (DataSnapshot scoutKeyTemplate : snapshot.getChildren()) {
                        scoutKeys.add(scoutKeyTemplate.getKey());
                    }
                    return scoutKeys;
                }).addOnSuccessListener(scoutKeys -> scoutIndicesTask.setResult(Pair.create(helper, scoutKeys)));
            }

            @Override
            public void onCancelled(DatabaseError error) {
                scoutIndicesTask.setException(error.toException());
                FirebaseCrash.report(error.toException());
            }
        });
    }
    for (Task<Pair<TeamHelper, List<String>>> scoutKeysTask : scoutIndicesTasks) {
        scoutKeysTask.addOnSuccessListener(this).addOnFailureListener(this);
    }
    Tasks.whenAll(scoutIndicesTasks).addOnSuccessListener(aVoid -> Tasks.whenAll(mScoutMetricsTasks).addOnSuccessListener(aVoid1 -> mScoutsTask.setResult(mScouts)).addOnFailureListener(this)).addOnFailureListener(this);
    return mScoutsTask.getTask();
}