非静态方法"getActivity"；不能从静态上下文中引用 [英] non-static method "getActivity" cannot be referenced from static context
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问题描述
我将方法设为静态，但是我遇到了这个问题:android.support.v4.app.FragmentTransaction transaction2 = getActivity() .getSupportFragmentManager().beginTransaction(); ....
i make a method static but i have this problem:
android.support.v4.app.FragmentTransaction transaction2 = getActivity().getSupportFragmentManager().beginTransaction();....
getActivity()在IDE中用红色下划线表示为什么?
getActivity() is underline in red by IDE why?
我告诉你我的代码
感谢大家！
片段:
public class MyListFragment extends Fragment implements
android.widget.CompoundButton.OnCheckedChangeListener {
ListView lv;
ArrayList<Planet> planetList;
static PlanetAdapter plAdapter;
BirraAdapter biAdapter;
PlanetAdapter.PlanetHolder holder;
private static Context context = null;
private static Main mInstance;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_list2, container, false);
context = getActivity();
mInstance= getActivity();
Button mButton = (Button) rootView.findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showResult(v);
}
});
//return inflater.inflate(R.layout.fragment_list2, container, false);
return rootView;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
lv = (ListView)getView().findViewById(R.id.listview);
displayPlanetList();
}
private void displayPlanetList() {
planetList = new ArrayList<Planet>();
planetList.add(new Planet("Margherita", 6, "€",1));
planetList.add(new Planet("Diavola", 7,"€",2));
planetList.add(new Planet("Bufalina", 5,"€",3));
planetList.add(new Planet("Marinara", 5, "€",4));
planetList.add(new Planet("Viennese", 4, "€", 5));
plAdapter = new PlanetAdapter(planetList, getContext()) {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
int pos = lv.getPositionForView(buttonView);
if (pos != ListView.INVALID_POSITION) {
Planet p = planetList.get(pos);
p.setSelected(isChecked);
/*Toast.makeText(
getActivity(),
"Clicked on Pizza: " + p.getName() + ". State: is "
+ isChecked, Toast.LENGTH_SHORT).show();*/
}
}
};
lv.setAdapter(plAdapter);
}
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
/*int pos = lv.getPositionForView(buttonView);
if (pos != ListView.INVALID_POSITION) {
Planet p = planetList.get(pos);
p.setSelected(isChecked);
*//*Toast.makeText(
getActivity(),
"Clicked on Planet: " + p.getName() + ". State: is "
+ isChecked, Toast.LENGTH_SHORT).show();*//*
}*/
}
public static void showResult(View v) {
String result = "Selected Product are :";
int totalAmount=0;
String result2 = "";
int totalAmount2=0;
String a="";
String z="";
/*for (Birra b : biAdapter.getBox()){
if (b.selected){
result += "\n" + b.name+" "+b.distance+"€"+"q.tà :"+b.getQuantità();
int quantitaInt= Integer.parseInt(b.getQuantità());
totalAmount+=b.distance * quantitaInt;
//a=String.valueOf(totalAmount);
}
}*/
for (Planet p : plAdapter.getBox()) {
if (p.isSelected()){
result2 += "\n" + p.getName()+" "+p.getDistance()+"€"+"q.tà :"+p.getQuantità();
int quantitaInt= Integer.parseInt(p.getQuantità() );
totalAmount2+=p.getDistance() * quantitaInt;
//z=String.valueOf(totalAmount2);
}
int totale=totalAmount+totalAmount2;
z=String.valueOf(totale);
}
Toast.makeText(context, result2 + "\n" + "Total Amount:=" + totalAmount2 + "€", Toast.LENGTH_LONG).show();
//Toast.makeText(getActivity(), result2 + "\n" + "Total Amount:=" + totalAmount2 + "€", Toast.LENGTH_LONG).show();
Bundle bun2 = new Bundle();
bun2.putString("scelta", result2);
ThreeFragment fgsearch2 = new ThreeFragment();
fgsearch2.setArguments(bun2);
android.support.v4.app.FragmentTransaction transaction2 = mInstance.getSupportFragmentManager().beginTransaction();
transaction2.replace(R.id.content_main, fgsearch2);
transaction2.commit();
/*Bundle bun = new Bundle();
bun.putString("totale", a);
TwoFragment fgsearch = new TwoFragment();
fgsearch.setArguments(bun);
android.support.v4.app.FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.content_main2, fgsearch);
transaction.commit();*//*
*/
/*
Bundle bun = new Bundle();
bun.putString("scelta", result2);
TwoFragment fgsearch = new TwoFragment();
fgsearch.setArguments(bun);
android.support.v4.app.FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.content_main2, fgsearch);
transaction.commit();
*/
}
}
活动:
public class Main extends AppCompatActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getSupportFragmentManager().beginTransaction().
replace(R.id.fragmentContainer, new MyListFragment()).commit();
}
}
推荐答案
您可以按照@sasikumar的建议更改方法，或者如果您不想修改方法，也可以执行以下操作:
You can change your method as @sasikumar suggests or you can do this if you dont want to modify your method:
为您的活动创建一个静态实例:例如，如果您的活动名称为MainActivity，则该实例将为 private static MainActivity mInstance 然后在片段的onCreateView()中，添加初始化它:
Create a static instance of your Activity: e.g if your activity's name is MainActivity, the instance would be private static MainActivity mInstance
then inside your fragment's onCreateView(), add initialize it:
mInstance=getActivity()
然后更改
android.support.v4.app.FragmentTransaction transaction2 = getActivity().getSupportFragmentManager().beginTransaction();
android.support.v4.app.FragmentTransaction transaction2 = mInstance.getSupportFragmentManager().beginTransaction();
这篇关于非静态方法"getActivity"；不能从静态上下文中引用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！
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