应用程序为何意外停止？

Question

这只是用于创建实验室布局。当我运行这个停止运行并在模拟器屏幕上显示一个对话框时，应用程序意外停止。通过阅读代码我无法在代码中发现错误。我将所有活动注册为清单。有人可以告诉我这段代码有什么错误。

在这里，这是我的主要活动接收机类

package com.example.tabwithswipe; 

import android.support.v4.app.Fragment; 
import android.app.ActionBar; 
import android.app.ActionBar.Tab; 
import android.app.FragmentTransaction; 
import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.view.ViewPager; 
import android.view.Menu; 

public class MainActivity extends FragmentActivity implements 
ActionBar.TabListener { 

private ViewPager viewPager; 
private TabsPagerAdapter mAdapter; 
private ActionBar actionBar; 
// Tab titles 
private String[] tabs = { "Top Rated", "Games", "Movies" }; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 

// Initilization 
viewPager = (ViewPager) findViewById(R.id.pager); 
actionBar = getActionBar(); 
mAdapter = new TabsPagerAdapter(getSupportFragmentManager()); 

viewPager.setAdapter(mAdapter); 
actionBar.setHomeButtonEnabled(false); 
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);   

// Adding Tabs 
for (String tab_name : tabs) { 
actionBar.addTab(actionBar.newTab().setText(tab_name) 
     .setTabListener(this)); 
} 

/** 
* on swiping the viewpager make respective tab selected 
* */ 
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { 

@Override 
public void onPageSelected(int position) { 
    // on changing the page 
    // make respected tab selected 
    actionBar.setSelectedNavigationItem(position); 
} 

@Override 
public void onPageScrolled(int arg0, float arg1, int arg2) { 
} 

@Override 
public void onPageScrollStateChanged(int arg0) { 
} 
}); 
} 

@Override 
public void onTabReselected(Tab tab, FragmentTransaction ft) { 
} 

@Override 
public void onTabSelected(Tab tab, FragmentTransaction ft) { 
// on tab selected 
// show respected fragment view 
viewPager.setCurrentItem(tab.getPosition()); 
} 

@Override 
public void onTabUnselected(Tab tab, FragmentTransaction ft) { 
} 

} 

这里是我的logcat：

03-12 14:37:48.851: I/dalvikvm(494): Failed resolving Lcom/example/tabwithswipe/MainActivity; interface 8 'Landroid/app/ActionBar$TabListener;' 
03-12 14:37:48.902: W/dalvikvm(494): Link of class 'Lcom/example/tabwithswipe/MainActivity;' failed 
03-12 14:37:48.902: D/AndroidRuntime(494): Shutting down VM 
03-12 14:37:48.931: W/dalvikvm(494): threadid=1: thread exiting with uncaught exception (group=0x40015560) 
03-12 14:37:48.992: E/AndroidRuntime(494): FATAL EXCEPTION: main 
03-12 14:37:48.992: E/AndroidRuntime(494): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.tabwithswipe/com.example.tabwithswipe.MainActivity}: java.lang.ClassNotFoundException: com.example.tabwithswipe.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.tabwithswipe-1.apk] 
03-12 14:37:48.992: E/AndroidRuntime(494): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569) 
03-12 14:37:48.992: E/AndroidRuntime(494): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
03-12 14:37:48.992: E/AndroidRuntime(494): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
03-12 14:37:48.992: E/AndroidRuntime(494): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
03-12 14:37:48.992: E/AndroidRuntime(494): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-12 14:37:48.992: E/AndroidRuntime(494): at android.os.Looper.loop(Looper.java:123) 
03-12 14:37:48.992: E/AndroidRuntime(494): at android.app.ActivityThread.main(ActivityThread.java:3683) 
03-12 14:37:48.992: E/AndroidRuntime(494): at java.lang.reflect.Method.invokeNative(Native Method) 
03-12 14:37:48.992: E/AndroidRuntime(494): at java.lang.reflect.Method.invoke(Method.java:507) 
03-12 14:37:48.992: E/AndroidRuntime(494): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
03-12 14:37:48.992: E/AndroidRuntime(494): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
03-12 14:37:48.992: E/AndroidRuntime(494): at dalvik.system.NativeStart.main(Native Method) 
03-12 14:37:48.992: E/AndroidRuntime(494): Caused by: java.lang.ClassNotFoundException: com.example.tabwithswipe.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.tabwithswipe-1.apk] 
03-12 14:37:48.992: E/AndroidRuntime(494): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240) 
03-12 14:37:48.992: E/AndroidRuntime(494): at java.lang.ClassLoader.loadClass(ClassLoader.java:551) 
03-12 14:37:48.992: E/AndroidRuntime(494): at java.lang.ClassLoader.loadClass(ClassLoader.java:511) 
03-12 14:37:48.992: E/AndroidRuntime(494): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
03-12 14:37:48.992: E/AndroidRuntime(494): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561) 
03-12 14:37:48.992: E/AndroidRuntime(494): ... 11 more 
03-12 14:38:08.451: I/Process(494): Sending signal. PID: 494 SIG: 9` 

这里是TabPagerAdapter类：

package com.example.tabwithswipe; 

import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 

public class TabsPagerAdapter extends FragmentPagerAdapter { 

public TabsPagerAdapter(FragmentManager fm){ 
super(fm); 
} 

@Override 
public Fragment getItem(int index) { 
    // TODO Auto-generated method stub 
    switch (index) { 
    case 0: 
     return new TopRatedFragment(); 


    case 1: 
     return new GamesFragment(); 

    case 2: 
     return new MoviesFragment(); 

    } 

    return null; 
} 

@Override 
public int getCount() { 
    // TODO Auto-generated method stub 
    return 3; 
} 
} 

Answer 1

添加下面的代码在你的清单文件：

<activity android:name="com.example.tabwithswipe.MainActivity>  
</activity>