无法解析符号FirebaseListAdapter [英] Cannot resolve symbol FirebaseListAdapter
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问题描述
如何正确插入FirebaseListAdapter?我总是收到错误无法解析FirebaseListAdapter".如果您需要某些东西，我会贴出来.整个应该花聊天消息.错误在第26行输出.
How do I insert the FirebaseListAdapter correctly? I always get the error "Can not resolve FirebaseListAdapter". If you need something, I'll post it. The whole is supposed to spend chat messages. The error is output in line 26.
我的代码:
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.firebase.ui.auth.AuthUI;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.FirebaseDatabase;
public class Chat extends AppCompatActivity {
private FirebaseAuth mAuth;
private static final int SIGN_IN_REQUEST_CODE = 123;
private FirebaseListAdapter<ChatMessage> adapter; //here is the problem
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
mAuth = FirebaseAuth.getInstance();
if(FirebaseAuth.getInstance().getCurrentUser() == null) {
// Start sign in/sign up activity
startActivityForResult(
AuthUI.getInstance()
.createSignInIntentBuilder()
.build(),
SIGN_IN_REQUEST_CODE
);
} else {
// User is already signed in. Therefore, display
// a welcome Toast
Toast.makeText(this,
"Willkommen " + FirebaseAuth.getInstance()
.getCurrentUser()
.getDisplayName(),
Toast.LENGTH_LONG)
.show();
// Load chat room contents
displayChatMessages();
}
FloatingActionButton fab =
(FloatingActionButton)findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EditText input = (EditText)findViewById(R.id.input);
// Read the input field and push a new instance
// of ChatMessage to the Firebase database
FirebaseDatabase.getInstance()
.getReference()
.push()
.setValue(new ChatMessage(input.getText().toString(),
FirebaseAuth.getInstance()
.getCurrentUser()
.getDisplayName())
);
// Clear the input
input.setText("");
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.menu_sign_out) {
AuthUI.getInstance().signOut(this)
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
Toast.makeText(Chat.this,
"You have been signed out.",
Toast.LENGTH_LONG)
.show();
// Close activity
finish();
}
});
}
return true;
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == SIGN_IN_REQUEST_CODE) {
if(resultCode == RESULT_OK) {
Toast.makeText(this,
"Erfolgreich eingeloggt. Willkommen!",
Toast.LENGTH_LONG)
.show();
displayChatMessages();
} else {
Toast.makeText(this,
"We couldn't sign you in. Please try again later.",
Toast.LENGTH_LONG)
.show();
// Close the app
finish();
}
}
}
@Override
public void onStart() {
super.onStart();
}
private void displayChatMessages() {
ListView listOfMessages = (ListView)findViewById(R.id.list_of_messages);
adapter = new FirebaseListAdapter<ChatMessage>(this, ChatMessage.class,
R.layout.message, FirebaseDatabase.getInstance().getReference()) {
@Override
protected void populateView(View v, ChatMessage model, int position) {
// Get references to the views of message.xml
TextView messageText = (TextView)v.findViewById(R.id.message_text);
TextView messageUser = (TextView)v.findViewById(R.id.message_user);
TextView messageTime = (TextView)v.findViewById(R.id.message_time);
// Set their text
messageText.setText(model.getMessageText());
messageUser.setText(model.getMessageUser());
// Format the date before showing it
messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)",
model.getMessageTime()));
}
};
listOfMessages.setAdapter(adapter);
}
}
构建Gradle
android {
compileSdkVersion 26
buildToolsVersion "26.0.2"
defaultConfig {
applicationId "de.bluestarfish.bluestarfish"
minSdkVersion 16
targetSdkVersion 26
versionCode 3
versionName "0.3.2"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:26.1.0'
testCompile 'junit:junit:4.12'
compile 'com.android.support:design:26.1.0'
compile 'com.android.support:cardview-v7:26.1.0'
compile 'com.daimajia.easing:library:2.0@aar'
compile 'com.daimajia.androidanimations:library:2.3@aar'
compile 'com.squareup.picasso:picasso:2.5.2'
compile 'com.google.android.gms:play-services-ads:11.8.0'
compile 'com.google.firebase:firebase-messaging:11.8.0'
compile 'com.google.firebase:firebase-core:11.8.0'
compile 'com.google.firebase:firebase-ads:11.8.0'
compile 'com.google.firebase:firebase-auth:11.8.0'
compile 'com.firebaseui:firebase-ui-auth:3.2.1'
compile 'com.google.firebase:firebase-database:11.8.0'
}
// Add to the bottom of the file
apply plugin: 'com.google.gms.google-services'
推荐答案
适配器的构造函数在3.x版中已更改.请按照来自FirebaseUI文档:
The constructors of the adapters have changed in version 3.x. Please follow the instructions from the FirebaseUI documentation:
FirebaseListOptions<Chat> options = new FirebaseListOptions.Builder<Chat>()
.setQuery(query, Chat.class)
.build();
FirebaseListAdapter<Chat> adapter = new FirebaseListAdapter<Chat>(options) {
@Override
protected void populateView(View v, Chat model, int position) {
// Bind the Chat to the view
// ...
}
};
这篇关于无法解析符号FirebaseListAdapter的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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