我正在Android中使用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，从我的一个标签Activit创建一个新的意图回到MainActivity然后它停止工作，每当我运行它时给出'强制关闭应用程序'错误。我已删除该功能，但错误仍然存在，
这是我的代码，
打包my.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Manifest中创建了，正如我所说，标签布局完美无缺，直到我尝试添加该功能，从那以后没有任何工作。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“你的内容必须有一个TabHost，其id属性为'android.R.id.tabhost'错误，”这里是主要错误，但从在线查看我发现这通常是由于没有设置'tabbed_main.xml'中的id标签正确但我确实设置正确。我花了几个小时在线查看并通过代码，但对于它无效的原因一无所知。任何帮助将不胜感激！感谢。
答案 0 :(得分：3)
是的，所以我设法找出问题所在，所以我想我会分享。问题在于使用 TabActivity 中的 SharedPreferences 功能。当我将扩展名更改为活动并创建新的MainTabbedActivity以生成选项卡布局的选项卡时，一切正常。
我不是百分之百确定为什么会这样，但我想这可能与Context有关。我很可能错误地使用TabActivity，因为所有活动应该为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意发表评论，我很想知道！）
因此，对于将来遇到类似问题的任何人，只需在主要活动中执行任何操作，然后为您的TabActivity创建一个意图，
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);
}
}
答案 1 :(得分：0)
那么，
我真的不确定，但根据this回答，一旦他取代了
android:id="@android:id/tabhost"
与
android:id="@+id/tabhost"
对他有用..试一试。
修改
由于这不起作用，下面的答案表明他通过删除R.java文件得到了这个，并且一旦IDE重新生成它（可能通过重建）它工作了
祝你好运
答案 2 :(得分：-1)
将xml文件重命名为独特的内容，例如main.xml或其他内容，而不是tabbed_main.xml。还要清理你的项目并删除R文件（它会再次重新生成），有时它会解决你的问题。