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通过片段替换TabActivity：错误膨胀类片段

分类: 技术问答 • 2022-07-05 18:01:21
问题描述：

我已经看到，我有一个共同的错误判断在这个论坛上提出的类似问题的数量，但我还没有在这些发现任何答案。通过片段替换TabActivity：错误膨胀类片段

我尝试使用片段来替换弃用的tabActivity。

import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 

public class MediaActivity extends FragmentActivity{ 

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

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <fragment 
     android:name="fr.partisocialite.psa.activity.TabsFragment" 
     android:id="@+id/tabs_fragment" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" /> 

</LinearLayout>

我也试着更换Android版本：通过

类

这名字是我的logcat：

02-09 10:07:48.738: E/AndroidRuntime(1713): FATAL EXCEPTION: main 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): 
> java.lang.RuntimeException: Unable to start activity 
> ComponentInfo{fr.partisocialiste.psa/fr.partisocialiste.psa.activity.MediaActivity}: 
> android.view.InflateException: Binary XML file line #7: Error 
> inflating class fragment 02-09 10:07:48.738: E/AndroidRuntime(1713): 
> at 
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.app.ActivityThread.startActivityNow(ActivityThread.java:1487) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:654) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.widget.TabHost.setCurrentTab(TabHost.java:326) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:132) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:456) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.view.View.performClick(View.java:2485) 02-09 10:07:48.738: 
> E/AndroidRuntime(1713): at 
> android.view.View$PerformClick.run(View.java:9080) 02-09 10:07:48.738: 
> E/AndroidRuntime(1713): at 
> android.os.Handler.handleCallback(Handler.java:587) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.os.Handler.dispatchMessage(Handler.java:92) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.os.Looper.loop(Looper.java:130) 02-09 10:07:48.738: 
> E/AndroidRuntime(1713): at 
> android.app.ActivityThread.main(ActivityThread.java:3683) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> java.lang.reflect.Method.invokeNative(Native Method) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> java.lang.reflect.Method.invoke(Method.java:507) 02-09 10:07:48.738: 
> E/AndroidRuntime(1713): at 
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> dalvik.system.NativeStart.main(Native Method) 02-09 10:07:48.738: 
> E/AndroidRuntime(1713): Caused by: android.view.InflateException: 
> Binary XML file line #7: Error inflating class fragment 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:587) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.view.LayoutInflater.rInflate(LayoutInflater.java:623) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.view.LayoutInflater.inflate(LayoutInflater.java:408) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.view.LayoutInflater.inflate(LayoutInflater.java:320) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.view.LayoutInflater.inflate(LayoutInflater.java:276) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.app.Activity.setContentView(Activity.java:1657) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> fr.partisocialiste.psa.activity.MediaActivity.onCreate(MediaActivity.java:14) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): ... 18 more 02-09 
> 10:07:48.738: E/AndroidRuntime(1713): Caused by: 
> android.support.v4.app.Fragment$InstantiationException: Unable to 
> instantiate fragment fr.partisocialite.psa.activity.TabsFragment: make 
> sure class name exists, is public, and has an empty constructor that 
> is public 02-09 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.support.v4.app.Fragment.instantiate(Fragment.java:332) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.support.v4.app.Fragment.instantiate(Fragment.java:300) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:248) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): ... 27 more 02-09 
> 10:07:48.738: E/AndroidRuntime(1713): Caused by: 
> java.lang.ClassNotFoundException: 
> fr.partisocialite.psa.activity.TabsFragment in loader 
> dalvik.system.PathClassLoader[/system/framework/com.google.android.maps.jar:/data/app/fr.partisocialiste.psa-1.apk] 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240) 
> 02-09 10:07:48.738: E/AndroidRuntime(1713): at 
> java.lang.ClassLoader.loadClass(ClassLoader.java:551) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> java.lang.ClassLoader.loadClass(ClassLoader.java:511) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  at 
> android.support.v4.app.Fragment.instantiate(Fragment.java:322) 02-09 
> 10:07:48.738: E/AndroidRuntime(1713):  ... 30 more 02-09 10:07:48.804: 
> I/global(1713): Loaded time zone names for en_US in 1110ms. 02-09 
> 10:07:49.957: D/dalvikvm(1713): GC_CONCURRENT freed 908K, 51% free 
> 3705K/7431K, external 2360K/3860K, paused 2ms+2ms 02-09 10:07:50.242: 
> I/global(1713): Loaded time zone names for en_US in 1147ms. 02-09 
> 10:07:50.410: D/dalvikvm(1713): GC_FOR_MALLOC freed 598K, 51% free 
> 3698K/7431K, external 2360K/3860K, paused 38ms 02-09 10:07:50.574: 
> D/dalvikvm(1713): GC_FOR_MALLOC freed 164K, 50% free 3779K/7431K, 
> external 2360K/3860K, paused 51ms 02-09 10:07:50.593: 
> D/dalvikvm(1713): GC_FOR_MALLOC freed 243K, 50% free 3773K/7431K, 
> external 2360K/3860K, paused 15ms 02-09 10:07:50.609: 
> D/dalvikvm(1713): GC_FOR_MALLOC freed <1K, 47% free 4010K/7431K, 
> external 2360K/3860K, paused 16ms 02-09 10:07:50.699: 
> D/dalvikvm(1713): GC_CONCURRENT freed 1194K, 49% free 3982K/7687K, 
> external 2360K/3860K, paused 2ms+3ms

非常感谢，我没有成功关于使我的logCat看起来更好，对此感到遗憾。

这里是我的课TabsFragment，

< < < < <

package fr.partisocialiste.psa.activity; 

import fr.partisocialiste.psa.R; 
import android.app.Activity; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TabHost; 
import android.widget.TextView; 
import android.widget.TabHost.OnTabChangeListener; 
import android.widget.TabHost.TabSpec; 

public class TabsFragment extends Fragment implements OnTabChangeListener{ 

    private static final String TAG = "FragmentTabs"; 
    public static final String TAB_HOLL = "Hollande"; 
    public static final String TAB_PS = "PS"; 

    private View mRoot; 
    private TabHost mTabHost; 
    private int mCurrentTab; 

    public TabsFragment(){ 
     super(); 
    } 


    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     mRoot = inflater.inflate(R.layout.tabs_fragment, null); 
     mTabHost = (TabHost) mRoot.findViewById(android.R.id.tabhost); 
     setupTabs(); 
     return mRoot; 
    } 

    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 
     setRetainInstance(true); 

     mTabHost.setOnTabChangedListener(this); 
     mTabHost.setCurrentTab(mCurrentTab); 
     // manually start loading hollande 
     updateTab(TAB_HOLL, R.id.tab_hollande); 
    } 

    private void setupTabs() { 
     mTabHost.setup(); // important! 
     mTabHost.addTab(newTab(TAB_HOLL, R.string.tab_hollande, R.id.tab_hollande)); 
     mTabHost.addTab(newTab(TAB_PS, R.string.tab_ps, R.id.tab_ps)); 
    } 

    private TabSpec newTab(String tag, int labelId, int tabContentId) { 
     Log.d(TAG, "buildTab(): tag=" + tag); 

     View indicator = LayoutInflater.from(getActivity()).inflate(
       R.layout.tab, 
       (ViewGroup) mRoot.findViewById(android.R.id.tabs), false); 
     ((TextView) indicator.findViewById(R.id.text)).setText(labelId); 

     TabSpec tabSpec = mTabHost.newTabSpec(tag); 
     tabSpec.setIndicator(indicator); 
     tabSpec.setContent(tabContentId); 
     return tabSpec; 
    } 

    @Override 
    public void onTabChanged(String tabId) { 
     if (TAB_HOLL.equals(tabId)) { 
      updateTab(tabId, R.id.tab_hollande); 
      mCurrentTab = 0; 
      return; 
     } 
     if (TAB_PS.equals(tabId)) { 
      updateTab(tabId, R.id.tab_ps); 
      mCurrentTab = 1; 
      return; 
     } 

    } 

    private void updateTab(String tabId, int placeholder) { 
     FragmentManager fm = getFragmentManager(); 
     if (fm.findFragmentByTag(tabId) == null) { 
      if(TAB_HOLL.equals(tabId)){ 
//    fm.beginTransaction() 
//    .replace(placeholder, new MyListFragment(tabId), tabId) 
//    .commit(); 
      } 
      else if(TAB_PS.equals(tabId)){ 
//    fm.beginTransaction() 
//    .replace(placeholder, new MyListFragment(tabId), tabId) 
//    .commit(); 
      } 
     } 
    } 

}
+0

我只是想知道你在这里使用什么API级别？ – Ksice 2012-05-15 13:30:20

+0

Android 2.2与兼容性库，我认为你可以从API 4 – 2012-05-15 13:50:20

答

的问题是如下

android.support.v4.app.Fragment $ InstantiationException：无法实例片段fr.partisocialite.psa.activity.TabsFragment：make 确定类名存在，是公开的，并且有一个空的构造函数 s public

以上检查并相应地进行更正。

+0

不幸使用它，类名存在，是公共的，并有一个空的构造函数是公共的！ – 2012-02-09 09:44:45

+0

它调用超级构造函数 – jeet 2012-02-09 09:50:06

+0

它确实不是，但不会改变任何东西...我已经复制粘贴我的tabsFragment类 – 2012-02-09 09:53:03

答

我通常使用inflater.inflate（R.layout.tabs_fragment，container，false）;但问题是这样的：

<fragment 
     android:name="fr.partisocialite.psa.activity.TabsFragment"...

你想

<fragment 
     class="fr.partisocialite.psa.activity.TabsFragment"...
+0

我确实已经尝试过了，我在原帖中写过，但不幸的是这并没有解决我的问题。因为我不确定它是名称还是班级，所以每次我改变一些东西时，我都会尝试。 – 2012-02-09 11:39:26

答

检查，如果你有这样的错误在这之前警告：

05-16 10:08:00.033: W/dalvikvm(1695): Unable to resolve superclass of Lmy/fragment/test/FragmentTestActivity; (7) 
05-16 10:08:00.076: W/dalvikvm(1695): Link of class 'Lmy/fragment/test/FragmentTestActivity;' failed

如果是这样，那么尝试：

配置Java Build Path - > Order And Export选项卡 - > set复选框android-support-v4.jar

（可能需要先删除现有的一个）

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