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所以我在http://www.androidhive.info/2011/10/android-login-and-registration-screen-design/关注用户登录和注册演练（在我们真正启动数据库之前）我已经准备好了一切，在 Eclipse 中没有错误。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吗？提前致谢！登录活动.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);
        }
    });
}
}

注册.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();
        }
    });
}
}

登录.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>

注册.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>

这是日志猫：

    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

这是 AndroidManifest.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: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>
4

1 回答 1

0

update:

the problem is that the activity is not registered in the manifest.

Please add your Activity in your AndroidManifest.xml.

When you want to making new activity, you should register it in your AndroidManifest.xml.

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>

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>
于 2013-08-26T23:17:07.533 回答