片段和活性的Android之间的数据共享 [英] Data Sharing between Fragments and Activity in Android
问题描述
香港专业教育学院之前问过类似的问题，并没有得到答案，似乎许多其他的脂肪酶在寻找一个答案。所以我张贴了这个问题，希望能够得到一个明确的答案，每个人都可以从中受益。
Ive asked a similar question before and didn't get an answer and seems many other ppl are searching for an answer. So I am posting this question to hopefully get a clear answer that everyone can benefit from.
我在这2段的活动。我想fragment2设置在活动一个布尔变量，当复选框被选中，这样片段1可以知道，如果该复选框被检查。
I have an activity with 2 fragments in it. I want fragment2 to set a boolean variable in Activity when a checkbox is checked so that fragment1 can know if the checkbox was checked.
这是我的code：
活动：
public class modestab extends Activity{
public static Context appContext;
public boolean lf=false;
public void onCreate(Bundle savedInstanceState){
appContext=this;
super.onCreate(savedInstanceState);
ActionBar tabbar= getActionBar();
tabbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab ModesTab =tabbar.newTab().setText("Modes");
ActionBar.Tab CatTab =tabbar.newTab().setText("Categories");
Fragment ModesFragment =new modes();
Fragment CatFragment =new cats();
ModesTab.setTabListener(new MyTabsListener(ModesFragment));
CattTab.setTabListener(new MyTabsListener(CatFragment));
tabbar.addTab(ModesTab);
tabbar.addTab(CatTab);
}
片段1：（这里我想读的布尔LF在活性的研究上面设置：
Fragment 1:(Where I want to read the boolean lf set in Acitivity above:
@TargetApi(11)
public class tabmodes extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View V=inflater.inflate(R.layout.tab_modes, container, false);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(lf==false) //lf here is the lf in Activity which I want to get
片段2：如果我想设置LF在活动
Fragment 2: Where I want to set lf in Activity
.....
lifecheck.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if(lifecheck.isChecked())
getActivity().lf=true;//Where I want to set the lf flag in Activity
;
}
});
在code不能编译，我不知道如何设置LF的活动也没怎么读它。有人建议我做getActivity（），但我没能看到变量。
The code doesn't compile and I am not knowing how to set lf in the Activity nor how to read it. Someone suggested I do getActivity() but I am not able to see the variable.
我试图创建一个功能setlf（布尔JK），而且我不能够看到它...
I tried to create a function setlf(boolean jk) but also I am not able to see it...
任何帮助是值得欢迎的：）
Any help is welcome :)
推荐答案
方法很多：
一）活动 - >片段
- 的在活动的：创建一个包，并使用片段<一href="http://developer.android.com/reference/android/app/Fragment.html#setArguments%28android.os.Bundle%29">setArguments(bundle)
- 的在片段的：使用束束= <一个href="http://developer.android.com/reference/android/app/Fragment.html#getArguments%28%29">getArguments()
- In your activity : create a bundle and use fragment.setArguments(bundle)
- in your fragment : use Bundle bundle = getArguments()
2）的片段 - >活动
- 的在片段的：创建联合国接口getter和setter方法（<一href="http://developer.android.com/guide/components/fragments.html#CommunicatingWithActivity">callback方法的）
- 的在活动的：实现接口
- In your fragment : create un interface with getter and setter methods (callback methods)
- In your activity : implement the interface
3）片段 - >活动
- 的在活动的：建立公共的getter和setter或其他方法
-
在片段的：所谓的公共活动的getter，setter方法或使用其它方法：
- In your activity : Create public getter and setter or other methods
In your fragment : called public activity getter, setter or other methods using :
<一个href="http://developer.android.com/reference/android/support/v4/app/Fragment.html#getActivity%28%29">getActivity().getSomething(), <一href="http://developer.android.com/reference/android/support/v4/app/Fragment.html#getActivity%28%29">getActivity().setSomething(args)或<一href="http://developer.android.com/reference/android/support/v4/app/Fragment.html#getActivity%28%29">getActivity().someMethod(args)
getActivity().getSomething(), getActivity().setSomething(args) or getActivity().someMethod(args)
4）活动 - >片段
-
在片段的：创建一个公共方法
In your fragment : create a public method
在活动的：调用有效片段public方法：
In your activity : call an active fragment public method :
<一个href="http://developer.android.com/reference/android/support/v4/app/FragmentActivity.html#getSupportFragmentManager%28%29">getSupportFragmentManager().findFragmentById(R.id.your_fragment).publicMethod(args)
getSupportFragmentManager().findFragmentById(R.id.your_fragment).publicMethod(args)
这篇关于片段和活性的Android之间的数据共享的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
