Question

我开发了一款名为pizza hut app的应用程序。这包含简单登录页面的代码，单击登录按钮时，必须导航到另一个名为“成功登录”的页面。这是我的代码。但我遇到的问题是“不幸的是披萨小屋应用程序停止了”。请帮我解决问题。

//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);

        }


    }

}

//成功登录（第二项活动）

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

    }

}

//清单

<?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>

// catlog

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

更改

public class MainActivity extends Activity implements onClickListener

到

public class MainActivity extends Activity implements OnClickListener

还有你的导入语句，

import android.content.DialogInterface.OnClickListener;

到

import android.view.View.OnClickListener;

最后，正如我的评论中所述，您还应该将您的SuccessfulLogin活动声明更新为如下所示，并在类名前加上一段时间：

<activity android:name=".SuccessfulLogin"

Answer 2

how to fix unfortunately appname has stopped

你应该看看堆栈跟踪。有一个部分引起的，它给出了发生异常的行号。您可以转到该行并修复问题

您也可以使用调试器。放入断点并调试代码。

应该是

 public class MainActivity extends Activity implements OnClickListener

更改

 import android.content.DialogInterface.OnClickListener;

应该是

 import android.view.View.OnClickListener;

虽然这没有错误

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

建议改为

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

编辑：

@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;
    }

如何解决不幸的是appname已经停止

2 个答案: