如何修復不幸的appname已停止

Question

我開發了一個名爲pizza hut app的應用程序。這包含簡單登錄頁面的代碼，當單擊登錄按鈕時，它必須導航到稱爲成功登錄的另一頁面。這是我的代碼。但是，我遇到了一個問題，「不幸的是，比薩餅屋應用程序已停止」。請幫我解決問題。

//main_activity 
package com.example.pizzahutapp; 

import android.os.Bundle; 
import android.app.Activity; 
import android.view.View.OnClickListener; 
import android.content.Intent; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 


public class MainActivity extends Activity implements OnClickListener { 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Button b = (Button)findViewById(R.id.button1); 
     b.setOnClickListener(this); 

    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 

     return true; 
    } 
    @Override 
    public void onClick(View arg0) { 
     // TODO Auto-generated method stub 
     if(arg0.getId()== R.id.button1) 
     { 
      Intent in = new Intent(this,SuccessfulLogin.class); 
      this.startActivity(in); 

     } 


    } 

} 

//成功登錄（第二活性）

package com.example.pizzahutapp; 

import android.app.Activity; 
import android.os.Bundle; 

public class SuccessfulLogin extends Activity { 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     // TODO Auto-generated method stub 

    } 

} 

//清單

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.pizzahutapp" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="8" 
     android:targetSdkVersion="18" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name="com.example.pizzahutapp.MainActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity android:name=".SuccessfulLogin" 
        android:label="@string/app_name"></activity> 

    </application> 

</manifest> 

//目錄下載

01-16 01:10:13.186: E/AndroidRuntime(1149): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.pizzahutapp/com.example.pizzahutapp.MainActivity}: java.lang.ClassCastException: android.widget.EditText cannot be cast to android.view.ViewGroup 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2176) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.app.ActivityThread.access$700(ActivityThread.java:135) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.os.Handler.dispatchMessage(Handler.java:102) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.os.Looper.loop(Looper.java:137) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.app.ActivityThread.main(ActivityThread.java:4998) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at java.lang.reflect.Method.invokeNative(Native Method) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at java.lang.reflect.Method.invoke(Method.java:515) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at dalvik.system.NativeStart.main(Native Method) 
01-16 01:10:13.186: E/AndroidRuntime(1149): Caused by: java.lang.ClassCastException: android.widget.EditText cannot be cast to android.view.ViewGroup 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:756) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:758) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.app.Activity.setContentView(Activity.java:1928) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at com.example.pizzahutapp.MainActivity.onCreate(MainActivity.java:22) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.app.Activity.performCreate(Activity.java:5243) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140) 
01-16 01:10:13.186: E/AndroidRuntime(1149):  ... 11 more 

Answer 1

變化

public class MainActivity extends Activity implements onClickListener 

到

public class MainActivity extends Activity implements OnClickListener 

而且也import語句，

import android.content.DialogInterface.OnClickListener; 

到

import android.view.View.OnClickListener; 

最後，在我的評論中提到，你也應該更新您SuccessfulLogin活動聲明如下所示，類名前有一段時間：

<activity android:name=".SuccessfulLogin" 

Answer 2

how to fix unfortunately appname has stopped 

你應該看看堆棧跟蹤。發生異常的部分會導致發生異常的行號。你可以去那條線並修復問題

你也可以使用調試器。放置中斷點並調試您的代碼。

應該

public class MainActivity extends Activity implements OnClickListener 

變化

import android.content.DialogInterface.OnClickListener; 

應該

import android.view.View.OnClickListener; 

雖然這是沒有錯的

View v = findViewById(R.id.button1); 

建議更改爲

Button b =(Button) findViewById(R.id.button1); 
b.setOnClickListener(this); 

編輯：

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     this.setContentView(R.layout.successfullogin); // remove this statement 
     return true; 
    }