android tabhost 跨点击出错. 400 请求出错
问题：
开发android应用，用tabhost + ViewPager 实现左右滑动页面效果。只要是顺时或逆时，无论点击tab或者手势滑动都没有问题，问题是：如果跨一个或者多个tab点击，就会出错，强行退出应用。
以下是主要代码，当跨tab点击时，onTabChanged（）这个方法有错，比如当前是第一个tab，然后点击第三个tab，这时代码mPager.setCurrentItem(2);这个出错！
请各位指教！
public class MainActivity extends Activity {
TabHost mTabHost;
@SuppressWarnings("deprecation")
LocalActivityManager manager;
@SuppressWarnings("deprecation")
String newsTag = "T1";
String starTag = "T2";
String carmeTag = "T3";
String buyTag = "T4";
String setTag = "T5";
// ViewPager是google SDk中自带的一个附加包的一个类，可以用来实现屏幕间的切换。
// android-support-v4.jar
ViewPager mPager;//页卡内容
private List<View> listViews; // Tab页面列表
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content);
mTabHost = (TabHost) findViewById(android.R.id.tabhost);
manager = new LocalActivityManager(MainActivity.this, false);
manager.dispatchCreate(savedInstanceState);
mTabHost.setup(manager);
mTabHost.setOnTabChangedListener(new tabListener());
Intent newsIntent = new Intent(MainActivity.this, NewsFragmentActivity.class);
Intent starIntent = new Intent(MainActivity.this, StarFragmentActivity.class);
Intent camerIntent = new Intent(MainActivity.this, CameraActivity.class);
Intent buyIntent = new Intent(MainActivity.this, BuyActivity.class);
Intent settingIntent = new Intent(MainActivity.this, SettingActivity.class);
mPager = (ViewPager) findViewById(R.id.viewpager);
listViews = new ArrayList<View>();
listViews.add(manager.startActivity(newsTag, newsIntent).getDecorView());
listViews.add(manager.startActivity(starTag, starIntent).getDecorView());
listViews.add(manager.startActivity(carmeTag, camerIntent).getDecorView());
listViews.add(manager.startActivity(buyTag, buyIntent).getDecorView());
listViews.add(manager.startActivity(setTag, settingIntent).getDecorView());
//
mPager.setAdapter(new MyPagerAdapter(listViews));
mPager.setCurrentItem(0);
mPager.setOnPageChangeListener(new MyOnPageChangeListener());
mTabHost.addTab(mTabHost
.newTabSpec(newsTag)
.setContent(newsIntent)
.setIndicator(getResources().getString(R.string.news),
getResources().getDrawable(R.drawable.tab_icon_news)));
mTabHost.addTab(mTabHost
.newTabSpec(starTag)
.setContent(starIntent)
.setIndicator(getResources().getString(R.string.star),
getResources().getDrawable(R.drawable.tab_icon_news)));
mTabHost.addTab(mTabHost
.newTabSpec(carmeTag)
.setContent(camerIntent)
.setIndicator(getResources().getString(R.string.camera),
getResources().getDrawable(R.drawable.tab_icon_news)));
mTabHost.addTab(mTabHost
.newTabSpec(buyTag)
.setContent(buyIntent)
.setIndicator(getResources().getString(R.string.buy),
getResources().getDrawable(R.drawable.tab_icon_news)));
mTabHost.addTab(mTabHost
.newTabSpec(setTag)
.setContent(settingIntent)
.setIndicator(getResources().getString(R.string.set),
getResources().getDrawable(R.drawable.tab_icon_news)));
// mTabHost.setCurrentTab(0);
updateTab(mTabHost);
// InitViewPager(manager);
}
@SuppressWarnings("deprecation")
@Override
protected void onPause() {
manager.dispatchPause(isFinishing());
super.onPause();
}
@SuppressWarnings("deprecation")
@Override
protected void onResume() {
manager.dispatchResume();
super.onResume();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString("tab", mTabHost.getCurrentTabTag());
}
class tabListener implements TabHost.OnTabChangeListener {
@Override
public void onTabChanged(String tabId) {
updateTab(mTabHost);
if(newsTag.equals(tabId)) {
mPager.setCurrentItem(0);
} else if(starTag.equals(tabId)) {
mPager.setCurrentItem(1);
} else if(carmeTag.equals(tabId)) {
mPager.setCurrentItem(2);
} else if(buyTag.equals(tabId)) {
mPager.setCurrentItem(3);
} else if(setTag.equals(tabId)) {
mPager.setCurrentItem(4);
}
}
}
private void InitViewPager(final LocalActivityManager manager) {
mPager = (ViewPager) findViewById(R.id.viewpager);
listViews = new ArrayList<View>();
// LayoutInflater mInflater = getLayoutInflater();
// listViews.add(mInflater.inflate(R.layout.red_module_news, null));
// listViews.add(mInflater.inflate(R.layout.red_module_star, null));
// listViews.add(mInflater.inflate(R.layout.red_module_camera, null));
// listViews.add(mInflater.inflate(R.layout.red_module_buy, null));
// listViews.add(mInflater.inflate(R.layout.red_module_setting, null));
// System.out.println("hello");
// System.out.println(new MyPagerAdapter(listViews));
mPager.setAdapter(new MyPagerAdapter(listViews));
mPager.setCurrentItem(0);
mPager.setOnPageChangeListener(new MyOnPageChangeListener());
}
/**
* ViewPager适配器
*/
public class MyPagerAdapter extends PagerAdapter {
public List<View> mListViews;
public MyPagerAdapter(List<View> mListViews) {
this.mListViews = mListViews;
}
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView(mListViews.get(arg1));
}
@Override
public void finishUpdate(View arg0) {
}
@Override
public int getCount() {
return mListViews.size();
}
@Override
public Object instantiateItem(View arg0, int arg1) {
((ViewPager) arg0).addView(mListViews.get(arg1));
return mListViews.get(arg1);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == (arg1);
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public void startUpdate(View arg0) {
}
}
/**
* 页卡切换监听
*/
public class MyOnPageChangeListener implements OnPageChangeListener {
@Override
public void onPageSelected(int arg0) {
mTabHost.setCurrentTab(arg0);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
}
}
报错信息：
10-28 10:53:00.876: E/AndroidRuntime(3776): FATAL EXCEPTION: main
10-28 10:53:00.876: E/AndroidRuntime(3776): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.view.ViewGroup.addViewInner(ViewGroup.java:3435)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.view.ViewGroup.addView(ViewGroup.java:3306)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.support.v4.view.ViewPager.addView(ViewPager.java:1111)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.view.ViewGroup.addView(ViewGroup.java:3251)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.view.ViewGroup.addView(ViewGroup.java:3227)
10-28 10:53:00.876: E/AndroidRuntime(3776): at com.red.main.MainActivity$MyPagerAdapter.instantiateItem(MainActivity.java:239)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.support.v4.view.PagerAdapter.instantiateItem(PagerAdapter.java:110)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:692)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.support.v4.view.ViewPager.populate(ViewPager.java:821)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:469)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:441)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:422)
10-28 10:53:00.876: E/AndroidRuntime(3776): at com.red.main.MainActivity$tabListener.onTabChanged(MainActivity.java:186)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.widget.TabHost.invokeOnTabChangeListener(TabHost.java:463)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.widget.TabHost.setCurrentTab(TabHost.java:448)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:161)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:563)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.view.View.performClick(View.java:4354)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.view.View$PerformClick.run(View.java:17948)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.os.Handler.handleCallback(Handler.java:725)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.os.Handler.dispatchMessage(Handler.java:92)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.os.Looper.loop(Looper.java:137)
10-28 10:53:00.876: E/AndroidRuntime(3776): at android.app.ActivityThread.main(ActivityThread.java:5293)
10-28 10:53:00.876: E/AndroidRuntime(3776): at java.lang.reflect.Method.invokeNative(Native Method)
10-28 10:53:00.876: E/AndroidRuntime(3776): at java.lang.reflect.Method.invoke(Method.java:511)
10-28 10:53:00.876: E/AndroidRuntime(3776): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
10-28 10:53:00.876: E/AndroidRuntime(3776): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
10-28 10:53:00.876: E/AndroidRuntime(3776): at dalvik.system.NativeStart.main(Native Method)
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"你应该贴出错误信息及代码。######<div class=""ref"">
引用来自“铂金小猫”的答案
你应该贴出错误信息及代码。谢谢你提醒，已经贴出，请指教！######回复 @张婉玲 : 你的mPager对象估计存在这个问题http://blog.csdn.net/yaolingrui/article/details/7339913######回复 @铂金小猫 : 报错信息已贴出，谢谢！######贴一下报错信息。######左右滑动只要viewpager就行了，要tabhost干嘛？Tab的效果完全可以自己用几个Button实现，或者用ActionBar的Tab，现在ActionBar有低版本support包了，v7，2.1以上都可以用了
"2020-05-26 13:12:31赞同 展开评论
