Tabhost選項卡onCreate方法被調用兩次

Question

看來，當我點擊我的選項卡按鈕時，onCreate方法被調用兩次。有沒有另一種方法來製作一個tabhost？繼承人我的代碼：

public class MyTabHostActivity extends TabActivity { 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.tabactivity); 

    TabHost tabHost=getTabHost(); 
    setup(tabHost);  
} 


private void setup(TabHost tabHost) 
{ 
    Intent intent1 = new Intent(this, Activity1.class); 
    setupTab("Activity1", tabHost, intent1); 

    Intent intent2 = new Intent(this,Activity2.class); 
    setupTab("Activity2", tabHost, intent2); 

    Intent intent3 = new Intent(this,Activity3.class); 
    setupTab("Activity3", tabHost, intent3);  
} 

private void setupTab(final String tag, final TabHost mTabHost, Intent intent) { 
    View tabview = createTabView(mTabHost.getContext(), tag, mTabHost); 
    TabSpec setContent = mTabHost.newTabSpec(tag).setIndicator(tabview).setContent(intent); 
    mTabHost.addTab(setContent); 
} 

private static View createTabView(final Context context, final String text, final TabHost mTabHost) { 
    View view = LayoutInflater.from(context).inflate(R.layout.tab_bg, null); 
    TextView tv = (TextView) view.findViewById(R.id.tabsText); 
    tv.setText(text); 
    return view; 
} 
} 

public class Activity1 extends Activity { 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    Log.d("Activity1", "onCreate"); 

} 

} 

public class Activity2 extends Activity { 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    Log.d("Activity2", "onCreate"); 

} 

} 
public class Activity3 extends Activity { 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    Log.d("Activity3", "onCreate"); 

} 

} 

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


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

<FrameLayout android:layout_width="fill_parent" android:paddingBottom="45dp" 
    android:layout_height="wrap_content" android:id="@android:id/tabcontent"> 
</FrameLayout> 
</TabHost> 

tab_bg.xml 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/tabsLayout" android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:padding="10dip" android:gravity="center" android:orientation="vertical"> 

<TextView android:id="@+id/tabsText" android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textSize="15dip" /> 
</LinearLayout> 
main.xml 
<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
     > 
<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello" 
/> 
</LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.test" 
    android:versionCode="1" 
    android:versionName="1.0"> 
<uses-sdk android:minSdkVersion="8" /> 

<application android:icon="@drawable/icon" android:label="@string/app_name"> 
    <activity android:name=".MyTabHostActivity" 
       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=".Activity1" android:screenOrientation="portrait" /> 
    <activity android:name=".Activity2" android:screenOrientation="portrait" /> 
    <activity android:name=".Activity3" android:screenOrientation="portrait" /> 
</application> 
</manifest> 

Answer 1

它不會被調用兩次。我很確定你在你的emulator中運行你的代碼，你看到這個方法被觸發兩次。但這只是emulator中的另一個缺陷，並且這絕不會發生在真實設備上。