eclipse 从另一个片段调用一个片段中的方法
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/27217362/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Calling a method in one fragment from another
提问by K Manos
I've been trying for a while already (as well, searching in here) for something to help me to refresh listView in my MainFragment, when a button is pressed in other fragment. Could sommeone explain me how to make it work?
我已经尝试了一段时间（也在此处搜索）以帮助我在其他片段中按下按钮时刷新 MainFragment 中的 listView。有人可以解释我如何使它工作吗？
Here's MainFragment with the function (I excluded other functions, since I don't see how they contribute):
这是带有函数的 MainFragment（我排除了其他函数，因为我看不到它们是如何贡献的）：
public class MainFragment extends Fragment {
public void otherList() {
SQLite db = new SQLite(getActivity());
db.open();
Calendar sCalendar = Calendar.getInstance();
String day = sCalendar.getDisplayName(Calendar.DAY_OF_WEEK,
Calendar.LONG, Locale.ENGLISH);
Cursor c = db.getAllRecords(day);
Calendar cal = Calendar.getInstance();
int hour = cal.get(Calendar.HOUR_OF_DAY);
arrayOfBars.clear();
if (c.moveToFirst()) {
do {
String country = c.getString(0);
String city = c.getString(1);
String bar = c.getString(2);
String timeStart = c.getString(3);
String[] h = timeStart.split(":");
int times = Integer.parseInt(h[0]);
String timeEnd = c.getString(4);
String[] h2 = timeEnd.split(":");
int timee = Integer.parseInt(h2[0]);
String placeLaLo = c.getString(5);
String description = c.getString(6);
String likes = c.getString(7);
String offer = c.getString(8);
if (hour < (times + 1) || hour < (timee)) {
getPrefs = PreferenceManager
.getDefaultSharedPreferences(MainFragment.this
.getActivity());
boolean lay = getPrefs.getBoolean("boolean", false);
if (lay == true) {
while (times < timee) {
timeStart = times + ":" + h[1];
times++;
timeEnd = times + ":" + h2[1];
arrayOfBars.add(new BarObject(country, city, bar,
timeStart, timeEnd, placeLaLo, description,
likes, offer, bar));
}
} else {
arrayOfBars.add(new BarObject(country, city, bar,
timeStart, timeEnd, placeLaLo, description,
likes, offer, bar));
}
}
} while (c.moveToNext());
Collections.sort(arrayOfBars, new BarObject.CompST());
lv2.setAdapter(null);
adapter = new BarAdapter(getActivity(), arrayOfBars);
lv2.setAdapter(adapter);
} else {
Toast.makeText(getActivity(), "No database found",
Toast.LENGTH_LONG).show();
}
db.close();
}
}
}
And here's the other fragment:
这是另一个片段：
public class SocialMedia extends Fragment {
ImageButton facebook, twitter, layoutS;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.social_media, container, false);
layoutS = (ImageButton) view.findViewById(R.id.ibLayout);
layoutS.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences getPrefs = PreferenceManager
.getDefaultSharedPreferences(SocialMedia.this
.getActivity());
boolean lay = getPrefs.getBoolean("boolean", false);
SharedPreferences.Editor e = getPrefs.edit();
lay = !lay;
e.putBoolean("boolean", lay);
e.commit();
//Here I want to call otherList() from MainFragment
}
});
return view;
}
}
}
回答by K Manos
FragmentManager fm = getFragmentManager();
MainFragment fragm = (MainFragment)fm.findFragmentById(R.id.main_fragment);
fragm.otherList();
This code worked best for me. And seems quite easy
这段代码最适合我。而且看起来很容易
回答by Rakesh Kumar
In MainFragment class you can do the following code:
在 MainFragment 类中，您可以执行以下代码：
private static MainFragment instance = null;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
instance = this;
}
public static MainFragment getInstance() {
return instance;
}
And in SocialMedia class you can call the method as follows:
在 SocialMedia 类中，您可以按如下方式调用该方法：
MainFragment.getInstance().otherList();
回答by Mohammad Rahchamani
you should use interfacefor this. define an interfacein OtherFragmentclass and implement that in your MainActivityand define a publicmethod in your MainFragmentfor refreshing your ListViewand call that method from your MainActivity. here is an example :
你应该interface为此使用。定义一个interfaceinOtherFragment类并在您的类中实现它并在您的类中MainActivity定义一个public方法MainFragment以刷新您ListView并从您的MainActivity. 这是一个例子：
public Class OtherFragment extends Fragment implements OnClickListener {
private Communicator communicator;
...
public void setCommunicator(Communicator communicator) {
this.communicator = communicator;
}
@Override
public void onClick(View v) {
communicator.clicked();
}
public interface Communicator {
public void clicked();
}
}
and in your MainActivity:
并在您的MainActivity：
public class MainActivity extends Activity implements OtherFragment.Communicator {
MainFragment mainFragment;
@Override
protected void onCreate(Bundle b) {
...
OtherFragment otherFragment = new OtherFragment();
otherFragment.setCommunicator(this);
...
}
...
@Override
public void clicked() {
mainFragment.updateList();
}
}
and in your MainFragment:
并在您的MainFragment：
public class MainFragment extends Fragment {
...
public void updateList() {
// update list
}
}
回答by m0skit0
To call a method from another object (a Fragment is an object) you need to have the reference of that object. So if you want to call MainFragment#otherList()from a SocialMediainstance, SocialMedianeeds a reference to MainFragment.
要从另一个对象（Fragment 是一个对象）调用方法，您需要拥有该对象的引用。所以如果你想MainFragment#otherList()从一个SocialMedia实例调用，SocialMedia需要一个对MainFragment.
For example:
例如：
public class SocialMedia {
private MainFragment mainFragment = null;
public void setMainFragment(final MainFragment mainFragment) {
this.mainFragment = mainFragment
}
}
Then you can use this.mainFragment.otherList().
然后你可以使用this.mainFragment.otherList().
回答by Sanjeev Kumar
// Calling Parent Fragment method from Child Fragment.
// Child Fragment
AppCompatActivity activity = (AppCompatActivity) view.getContext();
FragmentManager fragmentManager = activity.getSupportFragmentManager();
NavigateFragment navigateFragment = (NavigateFragment) fragmentManager.findFragmentById(R.id.fragment_place_dashboard);
navigateFragment.sayHelloWorld();
// -- Some method in Parent Fragment(NavigateFragment).
public void sayHelloWorld(){
Log.d(TAG, "Hello World.");
}
