Android 如何在TabChange上保存/恢复片段中视图的状态
可能是重复的问题。但是我找不到解决我问题的办法 我有一个有3个标签的TabHost。比如说Android 如何在TabChange上保存/恢复片段中视图的状态,android,android-fragments,android-tabhost,savestate,fragment-tab-host,Android,Android Fragments,Android Tabhost,Savestate,Fragment Tab Host,可能是重复的问题。但是我找不到解决我问题的办法 我有一个有3个标签的TabHost。比如说tabA，tabB，tabC。当我切换到另一个选项卡（即tabA或tabB）并返回到tabC时，我在tabC中进行了很多视图更改，如按钮文本更改、编辑文本更改。视图的所有my值（按钮和编辑文本），并将my All视图重置为默认XML文件值。我不想这样。 我只想知道如何保存视图的状态。我不能在换账单时丢失这个 我试过了，但失败了 这是我的密码 public View onCreateView(Layo
tabAtabBtabCtabCtabC public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Toast.makeText(getActivity(), "onCreateView", Toast.LENGTH_SHORT)
.show();
if (container == null) {
return null;
}
View vi = inflater.inflate(R.layout.settings, container, false);
btnInsert = (Button) vi.findViewById(R.id.btnInsert);
btnInsert.setOnClickListener(this);
btnPosition = (Button) vi.findViewById(R.id.btnPosition);
btnPosition.setOnClickListener(this);
txtPosition = (TextView) vi.findViewById(R.id.txtPosition);
txtLogo = (TextView) vi.findViewById(R.id.txtLogo);
imgLogoPreview = (ImageView) vi.findViewById(R.id.imgLogoPreview);
imgLogoPreview.setOnClickListener(this);
edTxtUserText = (EditText) vi.findViewById(R.id.edTxtPreview);
relLogo = (RelativeLayout) vi.findViewById(R.id.RelLogo);
relText = (RelativeLayout) vi.findViewById(R.id.RelText);
logoWheel = (WheelView) vi.findViewById(R.id.wheelLogo);
logoWheel.setAdapter(new ArrayWheelAdapter<String>(logoWheelList));
logoWheel.setVisibleItems(4);
logoWheel.setCurrentItem(1);
positionWheel = (WheelView) vi.findViewById(R.id.wheelPosition);
positionWheel.setAdapter(new ArrayWheelAdapter<String>(
positionWheelTextList));
// LogoWheel changed listener
changedListenerLogo = new OnWheelChangedListener() {
public void onChanged(WheelView wheel, int oldValue, int newValue) {
if (!wheelScrolled) {
}
}
};
logoWheel.addChangingListener(changedListenerLogo);
// Wheel scrolled listener
scrolledListenerLogo = new OnWheelScrollListener() {
public void onScrollStarts(WheelView wheel) {
wheelScrolled = true;
}
public void onScrollEnds(WheelView wheel) {
wheelScrolled = false;
btnInsert.setText(logoWheelList[wheel.getCurrentItem()] + "");
wheel.setVisibility(View.INVISIBLE);
if (wheel.getCurrentItem() == 2) {
txtPosition.setVisibility(View.INVISIBLE);
btnPosition.setVisibility(View.INVISIBLE);
relText.setVisibility(View.INVISIBLE);
relLogo.setVisibility(View.INVISIBLE);
} else if (wheel.getCurrentItem() == 1) {
relText.setVisibility(View.VISIBLE);
relLogo.setVisibility(View.INVISIBLE);
txtPosition.setVisibility(View.VISIBLE);
btnPosition.setVisibility(View.VISIBLE);
btnPosition.setText("Top");
positionWheel.setAdapter(new ArrayWheelAdapter<String>(
positionWheelTextList));
positionWheel.setVisibleItems(4);
positionWheel.setCurrentItem(1);
} else if (wheel.getCurrentItem() == 0) {
relLogo.setVisibility(View.VISIBLE);
relText.setVisibility(View.INVISIBLE);
txtPosition.setVisibility(View.VISIBLE);
btnPosition.setVisibility(View.VISIBLE);
btnPosition.setText("Top Left");
positionWheel.setAdapter(new ArrayWheelAdapter<String>(
positionWheelLogoList));
positionWheel.setVisibleItems(4);
positionWheel.setCurrentItem(1);
}
}
};
logoWheel.addScrollingListener(scrolledListenerLogo);
// /////////////////////Positon Wheel Listners///////////
// LogoWheel changed listener
changedListenerPosition = new OnWheelChangedListener() {
public void onChanged(WheelView wheel, int oldValue, int newValue) {
if (!wheelScrolled) {
}
}
};
positionWheel.addChangingListener(changedListenerPosition);
// Wheel scrolled listener
scrolledListenerPosition = new OnWheelScrollListener() {
public void onScrollStarts(WheelView wheel) {
wheelScrolled = true;
}
public void onScrollEnds(WheelView wheel) {
wheelScrolled = false;
String btnStatus = btnInsert.getText().toString();
if (btnStatus.equals("Logo")) {
btnPosition.setText(positionWheelLogoList[positionWheel
.getCurrentItem()] + "");
} else if (btnStatus.equals("Text")) {
btnPosition.setText(positionWheelTextList[positionWheel
.getCurrentItem()] + "");
}
wheel.setVisibility(View.INVISIBLE);
}
};
positionWheel.addScrollingListener(scrolledListenerPosition);
return vi;
}
我正在学习教程。对于少量片段，您可以尝试以下方法
在onCreate（）处设置为true这是您问题的解决方案，我的建议是这对您有帮助。。。我发布了一段代码：
TabHost.OnTabChangeListener tabChangeListener = new TabHost.OnTabChangeListener() {
@Override
public void onTabChanged(String tabId) {
android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
AndroidFragment androidFragment = (AndroidFragment) fm.findFragmentByTag("android");
AppleFragment appleFragment = (AppleFragment) fm.findFragmentByTag("apple");
android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
/** Detaches the androidfragment if exists */
/** Detaches the applefragment if exists */
/** If current tab is android */
if(tabId.equalsIgnoreCase("android")){
if(androidFragment==null){
/** Create AndroidFragment and adding to fragmenttransaction */
ft.add(R.id.realtabcontent,new AndroidFragment(), "android");
}else{
/** Bring to the front, if already exists in the fragmenttransaction */
if(appleFragment!=null)
ft.hide(appleFragment);
ft.show(androidFragment);
}
}else{ /** If current tab is apple */
if(appleFragment==null){
/** Create AppleFragment and adding to fragmenttransaction */
ft.add(R.id.realtabcontent,new AppleFragment(), "apple");
}else{
/** Bring to the front, if already exists in the fragmenttransaction */
if(androidFragment!=null)
ft.hide(androidFragment);
ft.show(appleFragment);
}
}
ft.commit();
}
};
/** Setting tabchangelistener for the tab */
tHost.setOnTabChangedListener(tabChangeListener);
只要实现这一点，我就可以保存视图状态。…选项卡的代码是什么？如果在创建选项卡时不重新创建片段，则应保存状态change@YallaT我已经编辑了我的问题并粘贴了标签的代码。请看一看。ThankseTreateInstance将在内存中保留视图状态，因此无论您是否从选项卡A切换到C，如果您返回到选项卡A，它都将是相同的，这样您就不必实现savedInstance，并且仍然会调用onCreateView（），检查片段生命周期和setRetainInstance（）行为（上面的链接）文档说“控制是否在活动重新创建期间保留片段实例（例如从配置更改）。这只能用于不在后堆栈中的片段。如果设置，则重新创建活动时片段生命周期将略有不同：“这就成功了。但是必须稍微修改一下代码。在任何情况下，我们都必须隐藏
androidFragmentappleFragmentandroidFragmentnullif TabHost.OnTabChangeListener tabChangeListener = new TabHost.OnTabChangeListener() {
@Override
public void onTabChanged(String tabId) {
android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
AndroidFragment androidFragment = (AndroidFragment) fm.findFragmentByTag("android");
AppleFragment appleFragment = (AppleFragment) fm.findFragmentByTag("apple");
android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
/** Detaches the androidfragment if exists */
/** Detaches the applefragment if exists */
/** If current tab is android */
if(tabId.equalsIgnoreCase("android")){
if(androidFragment==null){
/** Create AndroidFragment and adding to fragmenttransaction */
ft.add(R.id.realtabcontent,new AndroidFragment(), "android");
}else{
/** Bring to the front, if already exists in the fragmenttransaction */
if(appleFragment!=null)
ft.hide(appleFragment);
ft.show(androidFragment);
}
}else{ /** If current tab is apple */
if(appleFragment==null){
/** Create AppleFragment and adding to fragmenttransaction */
ft.add(R.id.realtabcontent,new AppleFragment(), "apple");
}else{
/** Bring to the front, if already exists in the fragmenttransaction */
if(androidFragment!=null)
ft.hide(androidFragment);
ft.show(appleFragment);
}
}
ft.commit();
}
};
/** Setting tabchangelistener for the tab */
tHost.setOnTabChangedListener(tabChangeListener);