java - 您的内容必须有一个 TabHost，其 id 属性为 'android.R.id.tabhost' 错误与 android 应用程序

Question

我正在使用 Android 中的 Eclipse 创建一个应用程序。我的软件运行完美，直到我创建了一个函数，该函数从我的一个选项卡式 Activiy 创建了一个返回 MainActivity 的新 Intent ，然后它停止工作，每当我运行它时都会出现“强制关闭应用程序”错误。我已经删除了那个函数，但错误仍然存​​在，

这是我的代码，

打包我的.main;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;



import android.app.Activity;
import android.app.AlertDialog;
import android.app.TabActivity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;

public class MainActivity extends TabActivity {

    HttpClient      client      = new HttpClient();
    Security        security    = new Security();

    //file name for storing persistent data for sessions
        public static final String PREFS_SESSION = "AccountsFile";
        public static String storedEmailName = "userEmail";
        public static String storedPasswordName = "userPassword";

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

        /*check if username has been stored*/

        // if stored info exists, log the user in with login details and display main layout
            if(doesPersistExist(storedEmailName, PREFS_SESSION)){
                // auto login user
                    try 
                        {autologin();} 
                    catch (UnsupportedEncodingException e) 
                        {e.printStackTrace();}
                    setContentView(R.layout.tabbed_main);
               // Once logged in, display tabbed layouts
               // Generate tabes suing function generateTags()

                    // Generate tabs 
                        generateTab("Scan", R.drawable.icon_tab_scan, ScanActivity.class);
                        generateTab("Recent", R.drawable.icon_tab_recent, RecentActivity.class);
                        generateTab("Favourites", R.drawable.icon_tab_favourites, FavouritesActivity.class);
                        generateTab("Settings", R.drawable.icon_tab_settings, SettingsActivity.class);

            }

        // else, username has not been stored, prompt login
            else{
                    setContentView(R.layout.login);
                }

    }



    // Auto login user if credentials already exist
    public void autologin() throws UnsupportedEncodingException{
          //deleted contents of function to save room - this function definitely works
    }

    // Function that logs a user out by deleting the store user credentials
    public void logout(){
        //Create a sharedPreferences instance
            SharedPreferences persist = getSharedPreferences(PREFS_SESSION, 0);
        // Delete stored username and password
            persist.edit().remove(storedPasswordName).commit();
            persist.edit().remove(storedEmailName).commit();
        // Rteurn user to login screen
            setContentView(R.layout.login);
    }


    /*storeString*/

    //Persistently store a string - used for cookie name and value strings
    public Boolean storeString(String PREF_NAME, String stringName, String stringValue){

        // We need an Editor object to make preference changes.
        // All objects are from android.context.Context
        SharedPreferences settings = getSharedPreferences(PREF_NAME, 0);
        SharedPreferences.Editor editor = settings.edit();

        //commit session name and value to memory
        editor.putString(stringName, stringValue);
        // Commit the edits
        Boolean result = editor.commit();

        return result;
    }

    /*retrieveStoredString*/

    //retrieve a persistently stored string from function storeString()
    public String retrieveStoredString(String PREF_NAME, String stringName){

        SharedPreferences persist = getSharedPreferences(PREF_NAME, 0);
        String result = persist.getString(stringName, null);

        return result;
    }

    // Check if persistent store exists
    public Boolean doesPersistExist(String key, String PREF_NAME){

        SharedPreferences persist = getSharedPreferences(PREF_NAME, 0);
        Boolean result = persist.contains(key);

        return result;
    }

    // Function will generate a new tab
    public void generateTab(String tabSpec, int id, Class activity){
        TabHost tabHost = getTabHost();
        // Tab for scan
            TabSpec scanspec = tabHost.newTabSpec(tabSpec);
        // setting Title and Icon for the Tab
            scanspec.setIndicator(tabSpec, getResources().getDrawable(id));
        // create intent to start new tabbed activity
            Intent scanIntent = new Intent(this, activity);
            scanspec.setContent(scanIntent);
        // add the tab to the tab layout
            tabHost.addTab(scanspec);

    }




}

这是我的 tabbed_main.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" />
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>
    </LinearLayout>
</TabHost>

我已经在 list 中创建了，正如我所说，选项卡式布局在我尝试添加该功能之前工作得很好，但从那时起就没有任何效果。这是来自 logcat 的日志，

08-08 22:11:42.390: D/dalvikvm(1966): GC_FOR_ALLOC freed 37K, 5% free 6387K/6659K, paused 32ms
08-08 22:11:42.390: I/dalvikvm-heap(1966): Grow heap (frag case) to 6.834MB for 513744-byte allocation
08-08 22:11:42.440: D/dalvikvm(1966): GC_FOR_ALLOC freed 8K, 5% free 6881K/7175K, paused 35ms
08-08 22:11:42.490: D/AndroidRuntime(1966): Shutting down VM
08-08 22:11:42.490: W/dalvikvm(1966): threadid=1: thread exiting with uncaught exception (group=0x40226760)
08-08 22:11:42.490: E/AndroidRuntime(1966): FATAL EXCEPTION: main
08-08 22:11:42.490: E/AndroidRuntime(1966): java.lang.RuntimeException: Unable to start activity ComponentInfo{my.main/my.main.MainActivity}: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1751)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1767)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.app.ActivityThread.access$1500(ActivityThread.java:122)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1005)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.os.Looper.loop(Looper.java:132)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.app.ActivityThread.main(ActivityThread.java:4028)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at java.lang.reflect.Method.invokeNative(Native Method)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at java.lang.reflect.Method.invoke(Method.java:491)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at dalvik.system.NativeStart.main(Native Method)
08-08 22:11:42.490: E/AndroidRuntime(1966): Caused by: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.app.TabActivity.onContentChanged(TabActivity.java:105)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:245)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.app.Activity.setContentView(Activity.java:1780)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at my.main.MainActivity.onCreate(MainActivity.java:57)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
08-08 22:11:42.490: E/AndroidRuntime(1966):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1715)
08-08 22:11:42.490: E/AndroidRuntime(1966):     ... 11 more
08-08 22:11:42.500: D/dalvikvm(1966): GC_CONCURRENT freed 61K, 4% free 7021K/7239K, paused 2ms+4ms
08-08 22:16:46.110: I/Process(1966): Sending signal. PID: 1966 SIG: 9
08-08 22:20:10.500: V/TLINE(2142): new: android.text.TextLine@40871fb0
08-08 22:20:10.530: V/TLINE(2142): new: android.text.TextLine@40872bf8
08-08 22:22:19.030: I/jdwp(2142): Ignoring second debugger -- accepting and dropping
08-08 22:22:21.210: I/jdwp(2205): Ignoring second debugger -- accepting and dropping
08-08 22:22:21.310: D/dalvikvm(2205): GC_FOR_ALLOC freed 39K, 5% free 6385K/6659K, paused 34ms
08-08 22:22:21.310: I/dalvikvm-heap(2205): Grow heap (frag case) to 6.833MB for 513744-byte allocation
08-08 22:22:21.370: D/dalvikvm(2205): GC_CONCURRENT freed 0K, 5% free 6887K/7175K, paused 3ms+2ms
08-08 22:22:21.400: D/AndroidRuntime(2205): Shutting down VM
08-08 22:22:21.400: W/dalvikvm(2205): threadid=1: thread exiting with uncaught exception (group=0x40226760)
08-08 22:22:21.410: E/AndroidRuntime(2205): FATAL EXCEPTION: main
08-08 22:22:21.410: E/AndroidRuntime(2205): java.lang.RuntimeException: Unable to start activity ComponentInfo{my.main/my.main.MainActivity}: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1751)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1767)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.app.ActivityThread.access$1500(ActivityThread.java:122)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1005)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.os.Looper.loop(Looper.java:132)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.app.ActivityThread.main(ActivityThread.java:4028)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at java.lang.reflect.Method.invokeNative(Native Method)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at java.lang.reflect.Method.invoke(Method.java:491)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at dalvik.system.NativeStart.main(Native Method)
08-08 22:22:21.410: E/AndroidRuntime(2205): Caused by: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.app.TabActivity.onContentChanged(TabActivity.java:105)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:245)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.app.Activity.setContentView(Activity.java:1780)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at my.main.MainActivity.onCreate(MainActivity.java:57)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
08-08 22:22:21.410: E/AndroidRuntime(2205):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1715)
08-08 22:22:21.410: E/AndroidRuntime(2205):     ... 11 more
08-08 22:27:25.039: I/Process(2205): Sending signal. PID: 2205 SIG: 9

看起来“您的内容必须有一个 TabHost，它的 id 属性是‘android.R.id.tabhost’错误”是这里的主要错误，但是从网上看我发现这通常归结为没有设置'tabbed_main.xml' 中的 id 标记正确，但我肯定设置正确。我花了几个小时在线查看代码，但不知道为什么它不起作用。任何帮助将不胜感激!谢谢。

Answer 1

是的，所以我设法找出了问题所在，所以我想我会分享。问题在于在 TabActivity 中使用了 SharedPreferences 函数。当我将扩展更改为 Activity 并创建一个新的 MainTabbedActivity 来为选项卡布局生成选项卡时，一切正常。

我不是 100% 确定这是为什么，但我猜它可能与上下文有关。我很可能使用 TabActivity 是错误的，因为所有 Activity 应该做的是为 tablayout 生成选项卡 ​​- 不执行任何功能。 (如果有人知道它不起作用的确切原因，请随时发表评论，我很想知道!)

因此对于将来遇到类似问题的任何人，只需在主要 Activity 中做任何您需要做的事情，然后像这样为您的 TabActivity 创建一个 Intent ，

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    /*check if username has been stored*/

    // if stored info exists, log the user in with login details and display main layout
        if(doesPersistExist(storedEmailName, PREFS_SESSION)){
            // auto login user
           // Once logged in, display tabbed layouts
                Intent i = new Intent(getApplicationContext(), MainTabbedActivity.class);
                startActivity(i);

        }

    // else, username has not been stored, prompt login
        else{
                setContentView(R.layout.login);
            }

}