应用程序已意外停止〜

因此，我正在关注用户登录和注册演练http://www.androidhive.info/2011/10/android-login-and-registration-screen-design/（因为在我们实际上获取数据库之前的那一刻），并且在eclipse中没有错误的情况下，我拥有了一切。有人可以看看我的代码，并告诉我是什么导致应用程序意外停止？提前致谢！ LoginActivity.java应用程序已意外停止〜

package com.example.loginactivity; 

    import android.app.Activity; 
    import android.content.Intent; 
    import android.os.Bundle; 
    import android.view.View; 
    import android.widget.TextView; 


    public class LoginActivity extends Activity { 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    // setting default screen to login.xml 
    setContentView(com.example.loginactivity.R.layout.login); 


    TextView registerScreen = (TextView) findViewById(com.example.loginactivity.R.id.link_to_register); 

    // Listening to register new account link 
    registerScreen.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View v) { 
      // Switching to Register screen 
      Intent i = new Intent(getApplicationContext(), RegisterActivity.class); 
      startActivity(i); 
     } 
    }); 
} 
}

package com.example.loginactivity; 


    import android.app.Activity; 
    import android.os.Bundle; 
    import android.view.View; 
    import android.widget.TextView; 


public class RegisterActivity extends Activity { 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    // Set View to register.xml 
    setContentView(com.example.loginactivity.R.layout.register); 

    TextView loginScreen = (TextView) findViewById(com.example.loginactivity.R.id.link_to_login); 

    // Listening to Login Screen link 
    loginScreen.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View arg0) { 
          // Closing registration screen 
      // Switching to Login Screen/closing register screen 
      finish(); 
     } 
    }); 
} 
}

<?xml version="1.0" encoding="utf-8"?> 
    <ScrollView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:fillViewport="true"> 
    <RelativeLayout 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" android:background="#ffffff"> 

    <!-- Header Starts--> 
    <LinearLayout android:id="@+id/header" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:background="@layout/header_gradient" 
      android:paddingTop="5dip" 
      android:paddingBottom="5dip"> 
      <!-- Logo Start--> 
      <ImageView android:src="@drawable/ic_launcher" 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" 
         android:layout_marginLeft="10dip"/> 
      <!-- Logo Ends --> 
    </LinearLayout> 
    <!-- Header Ends --> 
    <!-- Footer Start --> 
    <LinearLayout android:id="@+id/footer" 
      android:layout_width="fill_parent" 
      android:layout_height="90dip" 
      android:background="@layout/footer_repeat" 
      android:layout_alignParentBottom="true" 
      android:orientation="horizontal"> 
    </LinearLayout> 
    <!-- Footer Ends --> 

    <!-- Login Form --> 
    <LinearLayout 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:padding="10dip" 
     android:layout_below="@id/header"> 
     <!-- Email Label --> 
     <TextView android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:textColor="#372c24" 
      android:text="Email"/> 
     <EditText android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="5dip" 
      android:layout_marginBottom="20dip" 
      android:singleLine="true"/> 
     <!-- Password Label --> 
     <TextView android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:textColor="#372c24" 
      android:text="Password"/> 
     <EditText android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="5dip" 
      android:singleLine="true" 
      android:password="true"/> 
     <!-- Login button --> 
     <Button android:id="@+id/btnLogin" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="10dip" 
      android:text="Login"/> 
     <!-- Link to Registration Screen --> 
     <TextView android:id="@+id/link_to_register" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="40dip" 
      android:layout_marginBottom="40dip" 
      android:text="New to Twitter? Register here" 
      android:gravity="center" 
      android:textSize="20dip" 
      android:textColor="#0b84aa"/> 

    </LinearLayout> 
    <!-- Login Form Ends --> 
    </RelativeLayout> 
    </ScrollView>

<?xml version="1.0" encoding="utf-8"?> 
<ScrollView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:fillViewport="true"> 
    <RelativeLayout 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" android:background="#fff"> 

    <!-- Header Starts--> 
    <LinearLayout android:id="@+id/header" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:background="@layout/header_gradient" 
      android:paddingTop="5dip" 
      android:paddingBottom="5dip"> 
      <!-- Logo Start--> 
      <ImageView android:src="@drawable/ic_launcher" 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" 
         android:layout_marginLeft="10dip"/> 
      <!-- Logo Ends --> 
    </LinearLayout> 
    <!-- Header Ends --> 
    <!-- Footer Start --> 
    <LinearLayout android:id="@+id/footer" 
      android:layout_width="fill_parent" 
      android:layout_height="90dip" 
      android:background="@layout/footer_repeat" 
      android:layout_alignParentBottom="true" 
      android:orientation="horizontal"> 
    </LinearLayout> 
    <!-- Footer Ends --> 

    <!-- Registration Form --> 
    <LinearLayout 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:padding="10dip" 
     android:layout_below="@id/header"> 
     <!-- Full Name Label --> 
     <TextView android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:textColor="#372c24" 
      android:text="Full Name"/> 
     <EditText android:id="@+id/reg_fullname" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="5dip" 
      android:singleLine="true" 
      android:layout_marginBottom="20dip"/> 
     <!-- Email Label --> 
     <TextView android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:textColor="#372c24" 
      android:text="Email"/> 
     <EditText android:id="@+id/reg_email" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="5dip" 
      android:singleLine="true" 
      android:layout_marginBottom="20dip"/> 
     <!-- Password Label --> 
     <TextView android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:textColor="#372c24" 
      android:text="Password"/> 
     <EditText android:id="@+id/reg_password" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:password="true" 
      android:singleLine="true" 
      android:layout_marginTop="5dip"/> 
     <!-- Register Button --> 
     <Button android:id="@+id/btnRegister" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="10dip" 
      android:text="Register New Account"/> 
     <!-- Link to Login Screen --> 
     <TextView android:id="@+id/link_to_login" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="40dip" 
      android:layout_marginBottom="40dip" 
      android:text="Already has account! Login here" 
      android:gravity="center" 
      android:textSize="20dip" 
      android:textColor="#025f7c"/> 

    </LinearLayout> 
    <!-- Registration Form Ends --> 
    </RelativeLayout> 
    </ScrollView>

这里是logcat的：

08-26 17:21:14.818: D/AndroidRuntime(17713): Shutting down VM 
08-26 17:21:14.818: W/dalvikvm(17713): threadid=1: thread exiting with uncaught exception  (group=0x4001d5a0) 
08-26 17:21:14.818: E/AndroidRuntime(17713): FATAL EXCEPTION: main 
08-26 17:21:14.818: E/AndroidRuntime(17713): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.loginactivity/com.example.loginactivity.MainActivity}: java.lang.ClassNotFoundException: com.example.loginactivity.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.loginactivity-2.apk] 
08-26 17:21:14.818: E/AndroidRuntime(17713): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1746) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1854) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at android.app.ActivityThread.access$1500(ActivityThread.java:135) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1041) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at android.os.Handler.dispatchMessage(Handler.java:99) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at android.os.Looper.loop(Looper.java:150) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at android.app.ActivityThread.main(ActivityThread.java:4333) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at java.lang.reflect.Method.invokeNative(Native Method) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at java.lang.reflect.Method.invoke(Method.java:507) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at dalvik.system.NativeStart.main(Native Method) 
08-26 17:21:14.818: E/AndroidRuntime(17713): Caused by: java.lang.ClassNotFoundException: com.example.loginactivity.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.loginactivity-2.apk] 
08-26 17:21:14.818: E/AndroidRuntime(17713): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at java.lang.ClassLoader.loadClass(ClassLoader.java:551) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at java.lang.ClassLoader.loadClass(ClassLoader.java:511) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at android.app.Instrumentation.newActivity(Instrumentation.java:1040) 
08-26 17:21:14.818: E/AndroidRuntime(17713): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1738) 
08-26 17:21:14.818: E/AndroidRuntime(17713): ... 11 more

这里是AndroidManifest.xml中

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

<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="17" /> 

<application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name="com.example.loginactivity.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> 
</application> 
    <application android:icon="@drawable/ic_launcher" android:label="@string/app_name"> 
    <activity android:name=".LoginActivity" 
       android:label="Login to your Account"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 

    <!-- Entry for RegisterActivity.class --> 
    <activity android:name=".RegisterActivity" 
       android:label="Register New Account"></activity> 

</application> 


</manifest>

来源

2013-08-26 user2712795

请捕捉并粘贴logcat的！ – ppeterka

更新：

的问题是，该活动不会在清单中注册。

请将您的活动添加到您的AndroidManifest.xml中。

当你想做出新的活动时，你应该在你的AndroidManifest.xml中注册它。

ex。

<activity 
     android:name="x.x.x.Register" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.REGISTER" /> 
      <category android:name="android.intent.category.DEFAULT" /> 
     </intent-filter> 
    </activity>

的manifest.xml

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

<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="17" /> 

    <application 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:allowBackup="true" 
     android:theme="@style/AppTheme" > 

    <activity android:name="com.example.loginactivity.LoginActivity" 
       android:label="Login to your Account"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 

     <activity 
      android:name="com.example.loginactivity.RegisterActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
       <action android:name="android.intent.action.REGISTERACTIVITY" /> 
       <category android:name="android.intent.category.DEFAULT" /> 
      </intent-filter> 
     </activity> 

</application> 


</manifest>

来源

2013-08-26 23:17:07

我改变了所有这些，它仍然给出了相同的错误。 – user2712795

使用'com.example.loginactivity.R.layout.login'完全没问题（尽管多余）。你可以从用户的问题中看到：软件包名称是'com.example.loginactivity'。 'R'是_indeed_'com.example.loginactivity.R'。另外，在Intent中使用'getApplicationContext（）'是合法的。 – Vikram

我应该在Maniefest.xml中正确地添加它......我将添加它。 – user2712795

应用程序已意外停止〜

回答

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