verursacht durch: java.lang.ClassCastException: android.widget.TextView kann nicht in android.widget.EditText umgewandelt werden

Question

Ich probierte sauberes Projekt und sogar Wiederaufbauprojekt, dort ist keine Änderung .... Die Anwendung hat Halt und das log Fehler ist:

package com.example.dota.jsonphp; 

import android.app.Activity; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 

public class MainActivity extends Activity implements View.OnClickListener 
{ 
    private EditText textview1; 
    private Button btnhit; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     textview1 = (EditText) findViewById(R.id.textview); 
     btnhit = (Button) findViewById(R.id.btnhit); 
     btnhit.setOnClickListener(this); 
    } 

    @Override 
    public void onClick(View v) { 
     new jsontask().execute("http://localhost/phppage.php"); 
    } 


    public class jsontask extends AsyncTask<String, String, String> { 


     @Override 
     protected String doInBackground(String... params) { 
      HttpURLConnection connection = null; 
      BufferedReader reader = null; 
      try { 
       URL url = new URL(params[0]); 
       connection = (HttpURLConnection) url.openConnection(); 
       connection.connect(); 

       InputStream stream = connection.getInputStream(); 
       reader = new BufferedReader(new InputStreamReader(stream)); 

       StringBuffer buffer = new StringBuffer(); 
       String line = ""; 
       while ((line = reader.readLine()) != null) { 
        buffer.append(line); 

       } 
       return buffer.toString(); 


      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } finally { 
       if (connection != null) { 
        connection.disconnect(); 
       } 
       try { 
        if (reader != null) { 
         reader.close(); 
        } 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 

      } 
      return null; 
     } 

     @Override 
     protected void onPostExecute(String result) { 
      super.onPostExecute(result); 
      textview1.setText(result); 
     } 

    } 


} 

Layout:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" 
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:showIn="@layout/activity_main" tools:context=".MainActivity" 
    android:orientation="vertical" 
    android:weightSum="1"> 

     <TextView 
      android:id="@+id/textview" 
      android:layout_width="265dp" 
      android:layout_height="wrap_content" 
      android:text="helloworld" 
      /> 
     <Button 
      android:layout_width="100dp" 
      android:layout_height="wrap_content" 
      android:id="@+id/btnhit" 
      android:text="HIt" 
      android:layout_weight="0.06" /> 

</LinearLayout> 

Answer 1

private TextView textview1; 
textview1 = (TextView) findViewById(R.id.textview);