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我剛開始用火力地堡和是偉大至今。然而，當我試圖用鉤UI火力地堡火力地堡和我RecyclerAdapter在卡片視圖的數據，我得到我的日誌貓以下錯誤，說Firebase：RecyclerView：無連接適配器;跳繩佈局
$ E/RecyclerView: No adapter attached; skipping layout
這是我MainActivity.java
package helloworld.firebase.com.helloworld;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.GoogleAuthProvider;
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.database.ValueEventListener;
import org.w3c.dom.Text;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
TextView text1, text2 ;
EditText edittitle, editdesc;
Button btn, post;
ListView mUserList;
private RecyclerView mRecyclerView;
private SignInButton mGooglebtn;
private static final int RC_SIGN_IN = 1;
private GoogleApiClient mGoogleApiClient;
private DatabaseReference mDatabase;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListner;
private FirebaseRecyclerAdapter firebaseRecyclerAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private static final String TAG = MainActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.blog_list);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.setAdapter(firebaseRecyclerAdapter);
mGooglebtn = (SignInButton) findViewById(R.id.googleBtn);
edittitle = (EditText) findViewById(R.id.edit_title);
editdesc = (EditText) findViewById(R.id.edit_desc);
post = (Button) findViewById(R.id.post);
post.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startPosting();
}
});
mAuth = FirebaseAuth.getInstance();
mAuthListner = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if (firebaseAuth.getCurrentUser() != null) {
Toast.makeText(MainActivity.this, "LOGGED IN", Toast.LENGTH_SHORT).show();
startActivity(new Intent(MainActivity.this, AccountActivity.class));
}
}
};
mDatabase = FirebaseDatabase.getInstance().getReference().child("Blog");
final String userID = mDatabase.push().getKey();
// Configure Google Sign In
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
mGoogleApiClient = new GoogleApiClient.Builder(getApplicationContext())
.enableAutoManage(this, new GoogleApiClient.OnConnectionFailedListener() {
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Toast.makeText(MainActivity.this, "ERROR", Toast.LENGTH_SHORT).show();
}
})
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
mGooglebtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
signIn();
}
});
private void startPosting() {
String name = edittitle.getText().toString().trim();
String desc = editdesc.getText().toString().trim();
DatabaseReference newPost = mDatabase.child("Blog").push();
newPost.child("title").setValue(name);
newPost.child("desc").setValue(desc);
}
protected void OnStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListner);
firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<User, BlogViewHolder>(User.class,
R.layout.blog_row,
BlogViewHolder.class,
mDatabase) {
@Override
protected void populateViewHolder(BlogViewHolder viewHolder, User model, int position) {
viewHolder.setTitle(model.getTitle());
viewHolder.setDesc(model.getDesc());
}
};
mRecyclerView.setAdapter(firebaseRecyclerAdapter);
}
public static class BlogViewHolder extends RecyclerView.ViewHolder {
View mView;
public BlogViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setTitle(String title) {
TextView posttitle = (TextView) mView.findViewById(R.id.post_title);
posttitle.setText(title);
}
public void setDesc (String desc) {
TextView postdesc = (TextView) mView.findViewById(R.id.post_desc);
postdesc.setText(desc);
}
}
private void signIn() {
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
if (result.isSuccess()) {
// Google Sign In was successful, authenticate with Firebase
GoogleSignInAccount account = result.getSignInAccount();
firebaseAuthWithGoogle(account);
} else {
// Google Sign In failed, update UI appropriately
// ...
Toast.makeText(this, "FAILED", Toast.LENGTH_SHORT).show();
}
}
}
private void firebaseAuthWithGoogle(GoogleSignInAccount account) {
Log.d(TAG, "firebaseAuthWithGoogle:" + account.getId());
AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(), null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful());
Toast.makeText(MainActivity.this, "LOGGED IN", Toast.LENGTH_SHORT).show();
startActivity(new Intent(MainActivity.this, AccountActivity.class));
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
Log.w(TAG, "signInWithCredential", task.getException());
Toast.makeText(MainActivity.this, "Authentication failed.",
Toast.LENGTH_SHORT).show();
}
// ...
}
});
}
}
//});
這是我User.class文件
package helloworld.firebase.com.helloworld;
public class User {
public String title, desc;
public User() {}
public User(String title, String desc) {
this.title = title;
this.desc = desc;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
}
該應用程序運行非常好，但RecyclerView適配器沒有越來越重視。這是我現在面臨的唯一問題。如果有人能幫忙，會很棒。基於Android的生命週期回調提前:)
請加firebaserecycleradapter類也 – TUSHAR
我創建在MainActivity定製FirebaseListAdapter子類來代替。 下的OnStart（）函數。 – Sivan