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我一直在玩一个 android 应用程序，然后重新启动以再次对其进行编码，看看我能从脑海中记住什么。问题是，我已经完全破坏了应用程序并且不明白为什么。

应用程序将加载一点，并显示某种形式的布局（不是任何定义的布局），然后崩溃。

以下是一些代码，如果您需要查看其他内容，请告诉我：

清单： 

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />

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

        <activity android:name="org.mjth.online_sn.main" 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="org.mjth.online_sn.live" android:label="@string/app_name"></activity>
        <activity android:name="org.mjth.online_sn.login_form" android:label="@string/app_name"></activity>

    </application>

</manifest>

主.java

import java.util.EmptyStackException;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.os.Bundle;

//Will do the default setup and checks
public class main extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);

        //Locks screen orientation to portrait for now
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

        //Checks to see if we have valid authorisation keys and files
        SharedPreferences pref = getSharedPreferences("org.mjth.online_sn", MODE_PRIVATE);

        try{

            if(pref.getString("auth_id", "").equals("") == false){
                throw new EmptyStackException();
            }

            if(pref.getString("auth_pass", "").equals("") == false){
                throw new EmptyStackException();
            }

            if(pref.getString("lcl_first_name", "").equals("") == false){
                throw new EmptyStackException();
            }

            if(pref.getString("lcl_last_name", "").equals("") == false){
                throw new EmptyStackException();
            }

            if(pref.getString("lcl_expiry", "").equals("") == false){
                throw new EmptyStackException();
            }

            //TODO: Check if expiry is past todays date.

            //We passed all local checks, set view to live and double check on background
            Intent myIntent = new Intent(getApplicationContext(), live.class);
            startActivityForResult(myIntent, 0);
        }catch (EmptyStackException e){
            //No valid credentials were found.
            Intent myIntent = new Intent(getApplicationContext(), login_form.class);
            startActivityForResult(myIntent, 0);
        }


    }



}

login_form.java

import org.mjth.online_sn.R;

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

public class login_form extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login_form);
    }
}

直播.java

import org.mjth.online_sn.R;

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

public class live extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.live);
    }
}

更新：禁用操作意图代码时，出现以下错误：

12-12 22:58:49.653: E/AndroidRuntime(1930): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{org.mjth.online_sn/org.mjth.online_sn.main}: java.lang.ClassNotFoundException: org.mjth.online_sn.main
12-12 22:58:49.653: E/AndroidRuntime(1930):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2024)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at android.app.ActivityThread.access$600(ActivityThread.java:140)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at android.os.Looper.loop(Looper.java:137)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at android.app.ActivityThread.main(ActivityThread.java:4898)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at java.lang.reflect.Method.invokeNative(Native Method)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at java.lang.reflect.Method.invoke(Method.java:511)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at dalvik.system.NativeStart.main(Native Method)
12-12 22:58:49.653: E/AndroidRuntime(1930): Caused by: java.lang.ClassNotFoundException: org.mjth.online_sn.main
12-12 22:58:49.653: E/AndroidRuntime(1930):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at android.app.Instrumentation.newActivity(Instrumentation.java:1057)
12-12 22:58:49.653: E/AndroidRuntime(1930):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2015)
12-12 22:58:49.653: E/AndroidRuntime(1930):     ... 11 more
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