java.lang.ClassCastException：android.widget.LinearLayout無法轉換爲android.widget.TextView populateview

-8

我該如何解決這個問題？java.lang.ClassCastException：android.widget.LinearLayout無法轉換爲android.widget.TextView populateview

的logcat：

FATAL EXCEPTION: main 
Process: com.example.vicevirus.myapplication, PID: 10011 
java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView 
    at com.example.vicevirus.myapplication.MainActivity$2.populateView(MainActivity.java:66) 
    at com.example.vicevirus.myapplication.MainActivity$2.populateView(MainActivity.java:63) 
    at com.firebase.ui.database.FirebaseListAdapter.getView(FirebaseListAdapter.java:135) 
    at android.widget.AbsListView.obtainView(AbsListView.java:2263) 
    at android.widget.ListView.makeAndAddView(ListView.java:1790) 
    at android.widget.ListView.fillDown(ListView.java:691) 
    at android.widget.ListView.fillFromTop(ListView.java:752) 
    at android.widget.ListView.layoutChildren(ListView.java:1616) 
    at android.widget.AbsListView.onLayout(AbsListView.java:2091) 
    at android.view.View.layout(View.java:14817) 
    at android.view.ViewGroup.layout(ViewGroup.java:4631) 
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671) 
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525) 
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1434) 
    at android.view.View.layout(View.java:14817) 
    at android.view.ViewGroup.layout(ViewGroup.java:4631) 
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388) 
    at android.view.View.layout(View.java:14817) 
    at android.view.ViewGroup.layout(ViewGroup.java:4631) 
    at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:437) 
    at android.view.View.layout(View.java:14817) 
    at android.view.ViewGroup.layout(ViewGroup.java:4631) 
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388) 
    at android.view.View.layout(View.java:14817) 
    at android.view.ViewGroup.layout(ViewGroup.java:4631) 
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671) 
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525) 
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1434) 
    at android.view.View.layout(View.java:14817) 
    at android.view.ViewGroup.layout(ViewGroup.java:4631) 
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388) 
    at android.view.View.layout(View.java:14817) 
    at android.view.ViewGroup.layout(ViewGroup.java:4631) 
    at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2011) 
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1768) 
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1024) 
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5694) 
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) 
    at android.view.Choreographer.doCallbacks(Choreographer.java:574) 
    at android.view.Choreographer.doFrame(Choreographer.java:544) 
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) 
    at android.os.Handler.handleCallback(Handler.java:733) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:136) 
    at android.app.ActivityThread.main(ActivityThread.java:5019) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
    at dalvik.system.NativeStart.main(Native Method)

MainActivity.java：

package com.example.vicevirus.myapplication; 

import android.app.Application; 
import android.content.Context; 
import android.os.*; 
import android.support.annotation.NonNull; 
import android.support.v7.app.AppCompatActivity; 
import android.util.Log; 
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.ui.User; 
import com.firebase.ui.database.FirebaseListAdapter; 
import com.google.firebase.auth.FirebaseAuth; 
import com.google.firebase.auth.FirebaseUser; 
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 java.util.HashMap; 
public class MainActivity extends AppCompatActivity { 

    private EditText editText; 
    private DatabaseReference chat_data_ref; 
    private DatabaseReference user_name_ref; 
    private ListView listView; 
    private FirebaseAuth mAuth; 
    private String name=""; 
    private static final String TAG = "RegisterActivity"; 
    HashMap<String,String> map; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     mAuth= FirebaseAuth.getInstance(); 
     editText=(EditText)findViewById(R.id.edittext); 
     chat_data_ref= FirebaseDatabase.getInstance().getReference().child("chat_data"); 
     user_name_ref=FirebaseDatabase.getInstance().getReference().child("chat_users").child(mAuth.getCurrentUser().getUid()).child("name"); 
     listView=(ListView)findViewById(R.id.listview); 
     map=new HashMap<>(); 
     FirebaseAuth auth = FirebaseAuth.getInstance(); 
     FirebaseAuth.AuthStateListener mAuthListener = new FirebaseAuth.AuthStateListener() { 
      @Override 
      public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) { 
       FirebaseUser user = firebaseAuth.getCurrentUser(); 
       if (user != null) { 
        // User is signed in 
        Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid()); 
       } else { 
        // User is signed out 
        Log.d(TAG, "onAuthStateChanged:signed_out"); 
       } 
      } 
     }; 
     FirebaseListAdapter<Message> adapter=new FirebaseListAdapter<Message>(
       this,Message.class,R.layout.individual_row,chat_data_ref 
     ) { 
      @Override 
      protected void populateView(View v, Message model, int position) { 
       TextView msg=(TextView)v.findViewById(R.id.textView1); 
       msg.setText(model.getUser_name()+" : "+model.getMessage()); 
      } 
     }; 
     listView.setAdapter(adapter); 
    } 
    public void send(View view) { 
     chat_data_ref.push().setValue(new Message(editText.getText().toString(),name));//storing actual msg with name of the user 
     editText.setText("");//clear the msg in edittext 
    } 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.menu,menu); 
     return super.onCreateOptionsMenu(menu); 
    } 
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     if(item.getItemId()==R.id.logout) 
     { 
      mAuth.signOut();//when the user clicks signout option this will executes 
      finish(); 
     } 
     return super.onOptionsItemSelected(item); 
    } 
}

我individual_row.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
    <LinearLayout 
     android:id="@+id/textView1" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_marginLeft="8dp" 
     android:layout_marginRight="8dp" 
     android:baselineAligned="false" 
     android:orientation="horizontal" 
     android:padding="2dp" > 

     <RelativeLayout 
      android:layout_width="wrap_content" 
      android:layout_height="fill_parent" 
      android:gravity="top|center" > 

      <RelativeLayout 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:gravity="center" 
       android:orientation="vertical" > 
       <TextView 
     android:text="TextView" 
     android:textStyle="bold" 
     android:layout_width="match_parent" 
     android:textSize="20sp" 
     android:layout_height="wrap_content" 
     android:id="@+id/textView1" 
     android:layout_gravity="bottom" 
     android:background="@drawable/ute" 
       /> 
      </RelativeLayout> 
     </RelativeLayout> 
<LinearLayout 
    android:layout_width="0dip" 
    android:layout_height="fill_parent" 
    android:layout_weight="1" 
    android:background="@drawable/ic_leq" 
    android:gravity="top|center" 
    android:orientation="vertical" > 
    </LinearLayout> 
</LinearLayout> 
</LinearLayout>

請幫助我。

來源

2017-07-11 Nub Doto

您的ID textview1加倍，它被設置爲線性佈局和TextView的更改其中一個

來源

2017-07-11 09:31:13 Ivan

tqvm！它工作 –

您的ID textview1一倍，只是從你的線性佈局中刪除android:id="@+id/textView1"

<LinearLayout 
android:id="@+id/linearLayout1" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 

    <TextView 
    android:text="TextView" 
    android:textStyle="bold" 
    android:layout_width="match_parent" 
    android:textSize="20sp" 
    android:layout_height="wrap_content" 
    android:id="@+id/textView1"

來源

2017-07-11 09:30:58

tqvm !!它工作 –

最歡迎@NubDoto –

你必須使用相同的ID 2次，讀取logcat的仔細下次

<LinearLayout 
    android:id="@+id/textView1" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 

<TextView 
     android:text="TextView" 
     android:textStyle="bold" 
     android:layout_width="match_parent" 
     android:textSize="20sp" 
     android:layout_height="wrap_content" 
     android:id="@+id/textView1"

來源

2017-07-11 09:31:41

tqvm！它的工作 –

在您的佈局中刪除以下行，它似乎有所有問題

android:background="@drawable/ute"

來源

2017-07-11 09:42:15

沒有工作抱歉，但我得到了我的修復。 tq btw –

樂意幫忙，感謝您的領導 –

java.lang.ClassCastException：android.widget.LinearLayout無法轉換爲android.widget.TextView populateview

回答

相關問題