[英]How to change fragment using Android studio navigation drawer
嗨,有人可以帮助我使用导航抽屉更改片段我尝试了一些指南,这里没有一个工作
这是我的代码
@Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
Fragment fragment;
FragmentManager fragmentManager = getSupportFragmentManager(); // For AppCompat use getSupportFragmentManager
switch(position) {
default:
case 0:
fragment = PlaceholderFragment.newInstance(position + 1);
break;
case 1:
fragment = new profile_fragment();
break;
}
fragmentManager.beginTransaction()
.replace(R.id.container, fragment)
.commit();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment)
.commit();
}
我想添加这个片段,但是当我从导航抽屉中单击第二个项目时总是会出错
package com.the.healthescort;
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class profile_fragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment profile_fragment.
*/
// TODO: Rename and change types and number of parameters
public static profile_fragment newInstance(String param1, String param2) {
profile_fragment fragment = new profile_fragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public profile_fragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_profile_fragment, container, false);
return rootView;
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(Uri uri);
}
}
您没有在MainActivity
实现OnFragmentInteractionListener
(在profile_fragment中)。 因为您的MainActivity调用profile_fragment。
因此,您需要在MainActivity
实现侦听器OnFragmentInteractionListener
。 像那样:
public class MainActivity extends ActionBarActivity
implements profile_fragment.OnFragmentInteractionListener {
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(Uri uri);
}
}
使用此方法替换fragmnet:
public void selectItem(int position) { switch (position) { case 0: Fragment fr2 = fragmentManager.findFragmentByTag("orders"); if (fr2 == null) { fragmentManager .beginTransaction() .replace(R.id.sellers_frame_container, new Sellers_Orders_Fragment(), "orders") .commit(); } else { fragmentManager.beginTransaction().show(fr2).commit(); } break; case 1: Fragment fr3 = fragmentManager.findFragmentByTag("add_product"); if (fr3 == null) { fragmentManager .beginTransaction() .replace(R.id.sellers_frame_container, new Sellers_Add_Product_Fragment(), "add_product").commit(); } else { fragmentManager.beginTransaction().show(fr3).commit(); } break; } }
在列表视图项目上单击导航抽屉中的此方法。
litview.onItemclickListener(.....){selectItem(postion); }
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