我有ActionBarDialog(DialogFragment),CarAdapter(RecycleView)和SportFragment。我在SportFragment中创建方法(infoMethod)以显示DialogFragment并正常工作。但是如果我想在CarAdapter中调用该infoMethod不起作用(java.lang.NullPointerException)
SportFragment中的infoMethod
public void infoMethod(){
Bundle args = new Bundle();
args.putString("title", "Dialog with Action Bar");
ActionBarDialog actionbarDialog = new ActionBarDialog();
actionbarDialog.setArguments(args);
actionbarDialog.show(getActivity().getSupportFragmentManager(),
"action_bar_frag");
}
我试图从CarAdapter调用infoMethod
public MyViewHolder(View view) {
super(view);
image= (ImageView) view.findViewById(R.id.imageViewlist);
image.setOnClickListener(this);
}
@Override
public void onClick(View v) {
SportFragment infoFrag = new SportFragment();
if (v.getId() == image.getId()){
v.startAnimation(AnimationUtils.loadAnimation(v.getContext(), R.anim.imagelist));
infoFrag.infoMethod(); //call infoMethod not work
Toast.makeText(v.getContext(), "ITEM PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(v.getContext(), "ROW PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
}
}
Logcat
09-29 13:30:09.292 18661-18661/com.paijostudio.hitungmasa E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at com.paijostudio.hitungmasa.fragment.SportFragment.infoMethod(SportFragment.java:210)
at com.paijostudio.hitungmasa.adapter.CarAdapter$MyViewHolder.onClick(CarAdapter.java:73)
at android.view.View.performClick(View.java:4204)
at android.view.View$PerformClick.run(View.java:17355)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
任何显示DialogFragment的解决方案吗?
最佳答案
由于您尝试在应用程序的两个单独区域中创建对话框,因此建议将其移到自己的类中
public class DialogHelper {
public static void infoMethod(FragmentManager fragmentManager) {
Bundle args = new Bundle();
args.putString("title", "Dialog with Action Bar");
ActionBarDialog actionbarDialog = new ActionBarDialog();
actionbarDialog.setArguments(args);
actionbarDialog.show(fragmentManager, "action_bar_frag");
}
}
然后在
SportFragment
中将呼叫替换为DialogHelper.infoMethod(getActivity().getSupportFragmentManager());
至于
CarAdapter
,则需要输入FragmentManager
。recyclerView.setAdapter(new CarAdapter(getActivity().getSupportFragmentManager()))
...
public class CarAdapter extends RecyclerView.Adapter<MyViewHolder> {
private FragmentManager fragmentManager;
public CarAdapter(FragmentManager fragmentManager) {
this.fragmentManager = fragmentManager;
}
public class MyViewHolder {
...
@Override
public void onClick(View v) {
if (v.getId() == image.getId()){
v.startAnimation(AnimationUtils.loadAnimation(v.getContext(), R.anim.imagelist));
DialogHelper.infoMethod(fragmentManager);
Toast.makeText(v.getContext(), "ITEM PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(v.getContext(), "ROW PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
}
}
}
}