java - アプリケーションが予期せず停止しました ~

Question

だから私はhttp://www.androidhive.info/2011/10/android-login-and-registration-screen-design/でユーザーのログインと登録のチュートリアルに従っています(データベースを実際に起動する前の瞬間)そして、Eclipseでエラーが発生することなく、すべてが整っています。誰かが私のコードを見て、アプリが予期せず停止する原因を教えてもらえますか? 前もって感謝します！LoginActivity.java

    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);
        }
    });
}
}

Register.java

    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();
        }
    });
}
}

login.xml

    <?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>

Register.xml

    <?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>

ログキャットは次のとおりです。

    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

ここに AndroidManifest.xml があります

    <?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>