【发布时间】：2019-08-21 02:08:33
【问题描述】：
我正在通过 Firebase 创建聊天信使，但 我的 Android Studio 2.3.2 无法解析 FirebaseRecyclerOptions 的符号 即使我的应用已成功与 Firebase 连接并正确配置到 Firebase 实时数据库和 FirebaseRecyclerAdaper进口也不错。
似乎 build.gradle 依赖项已同步且正常。我需要别人的帮助。
以下是我在 MainActivity 中的依赖项和代码。
在 build.gradle 中添加并尝试了其他几个依赖项
private FirebaseRecyclerAdapter<ChatMessage, MessageViewHolder> mFirebaseAdapter; // Ph4 Reading chat
private static final String MESSAGES_CHILD = "messages"; // Ph3 Chat DB
private DatabaseReference mFirebaseDatabaseReference; // Ph3 Chat DB
private EditText mMessageEditText; // Ph3 DB
private FirebaseAuth mFirebaseAuth;
private FirebaseUser mFirebaseUser;
private String mUsername; // Ph3 Chat DB
private String mPhotoUrl; // Ph3 DB
private GoogleApiClient mGoogleApiClient; // Ph2 Log-out
@Override // Ph2 Log-out
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
public static class MessageViewHolder extends RecyclerView.ViewHolder { // 내부클래스
TextView nameTextView;
ImageView messageImageView;
TextView messageTextView;
CircleImageView photoImageView;
public MessageViewHolder(View itemView) {
super(itemView);
nameTextView = (TextView) itemView.findViewById(R.id.nameTextView);
messageImageView = (ImageView) itemView.findViewById(R.id.messageImageView);
messageTextView = (TextView) itemView.findViewById(R.id.messageTextView);
photoImageView = (CircleImageView) itemView.findViewById(R.id.photoImageView);
}
}
private RecyclerView mMessageRecyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mFirebaseDatabaseReference = FirebaseDatabase.getInstance().getReference(); // Ph3 Chat DB
mMessageEditText = (EditText) findViewById(R.id.message_edit); // Ph3 DB
mMessageRecyclerView = (RecyclerView) findViewById(R.id.message_recycler_view);
findViewById(R.id.send_button).setOnClickListener(new View.OnClickListener() { // Ph3 Chat DB
@Override
public void onClick(View v) {
ChatMessage chatMessage = new ChatMessage(mMessageEditText.getText().toString(),
mUsername, mPhotoUrl, null);
mFirebaseDatabaseReference.child(MESSAGES_CHILD)
.push()
.setValue(chatMessage);
mMessageEditText.setText("");
}
});
mGoogleApiClient = new GoogleApiClient.Builder(this) // Ph2 Log-out
.enableAutoManage(this, this)
.addApi(Auth.GOOGLE_SIGN_IN_API)
.build();
mFirebaseAuth = FirebaseAuth.getInstance();
mFirebaseUser = mFirebaseAuth.getCurrentUser();
if (mFirebaseUser == null) {
startActivity(new Intent(this, SignInActivity.class));
finish();
return;
} else {
mUsername = mFirebaseUser.getDisplayName();
if (mFirebaseUser.getPhotoUrl() != null ) {
mPhotoUrl = mFirebaseUser.getPhotoUrl().toString();
}
}
Query query = mFirebaseDatabaseReference.child(MESSAGES_CHILD); // Ph4 Reading chat
FirebaseRecyclerOptions<ChatMessage> options = new FirebaseRecyclerOptions.Builder<ChatMessage>() //ph4
.setQuery(query, ChatMessage.class)
.build();
mFirebaseAdapter = new FirebaseRecyclerAdapter<ChatMessage, MessageViewHolder>(options) { // Ph4 Reading chat
@Override
protected void onBindViewHolder(MessageViewHolder holder, int position, ChatMessage model) {
holder.messageTextView.setText(model.getText());
holder.nameTextView.setText(model.getName());
if (model.getPhotoUrl() == null) {
holder.photoImageView.setImageDrawable(ContextCompat.getDrawable(MainActivity.this,
R.drawable.ic_account_circle_black_24dp));
} else {
Glide.with(MainActivity.this)
.load(model.getPhotoUrl())
.into(holder.photoImageView);
}
}
@Override
public MessageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_message, parent, false);
return new MessageViewHolder(view);
}
@Override
protected void populateViewHolder(MessageViewHolder viewHolder, ChatMessage model, int position) {
}
};
mMessageRecyclerView.setLayoutManager(new LinearLayoutManager(this)); // Ph4
mMessageRecyclerView.setAdapter(mFirebaseAdapter); // Ph4
}
@Override
protected void onStart() { // Ph4 Reading chat
super.onStart();
mFirebaseAdapter.startListening();
}
@Override
protected void onStop() { // Ph4 Reading chat
super.onStop();
mFirebaseAdapter.stopListening();
}
@Override // Ph2 Log-out
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override // Ph2 Log-out
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.sign_out_menu:
mFirebaseAuth.signOut();
Auth.GoogleSignInApi.signOut(mGoogleApiClient);
mUsername = "";
startActivity(new Intent(this, SignInActivity.class));
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
- 下面是 build.gradle
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:recyclerview-v7:25.3.1'
compile 'com.android.support.test:runner:0.5'
compile 'de.hdodenhof:circleimageview:3.0.0'
compile 'com.google.firebase:firebase-database:11.0.0'
compile 'com.google.firebase:firebase-auth:11.0.0'
testCompile 'junit:junit:4.12'
compile 'com.google.android.gms:play-services-auth:11.0.0'
compile 'com.firebaseui:firebase-ui-database:2.0.0'
compile 'com.github.bumptech.glide:glide:4.6.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.6.0'
}
apply plugin: 'com.google.gms.google-services'
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标签： java android firebase firebase-realtime-database firebaseui