无法从活动移动到TabActivity

Question

我不能从mainactivity.class移动到main.class。当我点击imageview时，它崩溃，不幸地显示我的应用程序已停止。

这是正常工作的主要活动：

package com.example.eateqadat; 

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

public class MainActivity extends Activity { 

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

     ImageView i = (ImageView)findViewById(R.id.imageView1); 
      i.setOnClickListener(new OnClickListener() { 

       public void onClick(View v) { 
        Intent explicitIntent = new Intent(MainActivity.this,main.class); 
        startActivity(explicitIntent); 
       } 
      }); 
    } 
} 

这是主类。我不知道什么是错误的，但它总是崩溃：

package com.example.eateqadat; 

import android.app.TabActivity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.widget.TabHost; 
import android.widget.TabHost.TabSpec; 

public class main extends TabActivity { 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     TabHost tabHost = getTabHost(); 

     // Android tab 
     Intent intentabout = new Intent().setClass(main.this, about.class); 
     TabSpec tabSpecabout = tabHost 
      .newTabSpec("Úä ÇáÈÑäÇãÌ") 
      .setContent(intentabout); 
     tabHost.addTab(tabSpecabout); 

     tabHost.setCurrentTab(1); 

    } 
} 

这是logcat的

01-21 17:43:23.506: E/Trace(1203): error opening trace file: No such file or directory (2) 
01-21 17:43:24.117: D/dalvikvm(1203): GC_FOR_ALLOC freed 32K, 3% free 10769K/11075K, paused 42ms, total 43ms 
01-21 17:43:24.126: I/dalvikvm-heap(1203): Grow heap (frag case) to 10.968MB for 376016-byte allocation 
01-21 17:43:24.186: D/dalvikvm(1203): GC_FOR_ALLOC freed <1K, 3% free 11136K/11463K, paused 30ms, total 30ms 
01-21 17:43:24.226: D/dalvikvm(1203): GC_FOR_ALLOC freed 0K, 3% free 11136K/11463K, paused 37ms, total 37ms 
01-21 17:43:24.236: I/dalvikvm-heap(1203): Grow heap (frag case) to 11.604MB for 667348-byte allocation 
01-21 17:43:24.316: D/dalvikvm(1203): GC_CONCURRENT freed 0K, 4% free 11787K/12167K, paused 18ms+3ms, total 77ms 
01-21 17:43:24.316: D/dalvikvm(1203): WAIT_FOR_CONCURRENT_GC blocked 6ms 
01-21 17:43:24.576: D/gralloc_goldfish(1203): Emulator without GPU emulation detected. 
01-21 17:43:26.936: D/AndroidRuntime(1203): Shutting down VM 
01-21 17:43:26.936: W/dalvikvm(1203): threadid=1: thread exiting with uncaught exception (group=0x2bc9a300) 
01-21 17:43:26.956: E/AndroidRuntime(1203): FATAL EXCEPTION: main 
01-21 17:43:26.956: E/AndroidRuntime(1203): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.eateqadat/com.example.eateqadat.main}: java.lang.IllegalArgumentException: you must specify a way to create the tab indicator. 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.app.ActivityThread.access$600(ActivityThread.java:130) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.os.Handler.dispatchMessage(Handler.java:99) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.os.Looper.loop(Looper.java:137) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at java.lang.reflect.Method.invokeNative(Native Method) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at java.lang.reflect.Method.invoke(Method.java:511) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at dalvik.system.NativeStart.main(Native Method) 
01-21 17:43:26.956: E/AndroidRuntime(1203): Caused by: java.lang.IllegalArgumentException: you must specify a way to create the tab indicator. 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.widget.TabHost.addTab(TabHost.java:217) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at com.example.eateqadat.main.onCreate(main.java:21) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.app.Activity.performCreate(Activity.java:5008) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
01-21 17:43:26.956: E/AndroidRuntime(1203):  ... 11 more 
01-21 17:43:29.846: I/Process(1203): Sending signal. PID: 1203 SIG: 9 

Answer 1

@ user1967751下面是样品，你

showtab.xml

<?xml version="1.0" encoding="utf-8"?> 
<TabHost xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@android:id/tabhost" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" > 

<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 

    <TabWidget 
     android:id="@android:id/tabs" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" > 
    </TabWidget> 

     <FrameLayout 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:id="@android:id/tabcontent" > 

    </FrameLayout> 

    </LinearLayout> 

</TabHost> 

下面是AfterLoginTabActivity的代码（标签活动被调用）

public class AfterLoginTabActivity extends TabActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.afterloginview); 
     @SuppressWarnings("deprecation") 
     TabHost tabHost =getTabHost(); 

     Intent i = new Intent(AfterLoginTabActivity.this,ProfileClass.class); 
     TabSpec profileSpec = tabHost.newTabSpec("profile").setIndicator("Profile").setContent(i); 

     Intent j = new Intent(AfterLoginTabActivity.this,GroupClass.class); 
     TabSpec groupSpec = tabHost.newTabSpec("group").setIndicator("group").setContent(j); 

     tabHost.addTab(profileSpec); 
     tabHost.addTab(groupSpec); 

     tabHost.setCurrentTab(1); 

    } 
    } 

码，我用我的button.setOnClickListener内

if(msg == "success") 
    { 
     System.out.println("Inside button"); 
     try { 
      Intent intent = new Intent(MainActivity.this,AfterLoginTabActivity.class); 
       startActivity(intent); 
       finish(); 
      } catch (Exception e) { 
       // TODO: handle exception 
       System.out.print("tHIS IS EXCCEPTION" + e); 
     } 

    }