Java tutorial
/* * Copyright (C) 2015 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.foodie.app.fragment; import android.content.Context; import android.graphics.Bitmap; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.text.TextUtils; import android.util.Log; import android.util.TypedValue; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.foodie.app.Entity.JsonListResult; import com.foodie.app.Entity.Result; import com.foodie.app.R; import com.foodie.app.model.User; import com.foodie.app.util.HttpUtils; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; import com.loopj.android.http.AsyncHttpResponseHandler; import com.nostra13.universalimageloader.core.DisplayImageOptions; import com.nostra13.universalimageloader.core.ImageLoader; import java.lang.reflect.Type; import java.util.List; import cz.msebera.android.httpclient.Header; public class UserListFragment extends Fragment { private List<User> users; private String flag; private RecyclerView rv; private static final String FLAG = "allfans"; private static final String ARG_BOOK = "book"; private TextView noDataView; public static UserListFragment newInstance(String flag) { UserListFragment fragment = new UserListFragment(); Bundle args = new Bundle(); args.putString(FLAG, flag); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { if (getArguments().containsKey(FLAG)) { flag = getArguments().getString(FLAG); } } } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_user_list, container, false); rv = (RecyclerView) view.findViewById(R.id.recyclerview); rv.setLayoutManager(new LinearLayoutManager(getContext())); noDataView = (TextView) view.findViewById(R.id.no_data); return view; } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); updateUsers(); } private void updateUsers() { if (HttpUtils.isNetworkConnected(getActivity())) { String url; if (flag != null) { url = flag.equals("allfans") ? "user/allfans/" : "user/allfollow/"; } else { return; } HttpUtils.getWithAuth(getContext(), url, new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) { Gson gson = new Gson(); //Type type = new TypeToken<JsonResult<User>>(){}.getType(); Type type = new TypeToken<JsonListResult<User>>() { }.getType(); JsonListResult<User> jsonListResult = gson.fromJson(new String(responseBody), type); String status = jsonListResult.getStatus(); String tipCode = jsonListResult.getTipCode(); users = jsonListResult.getData(); //Log.v(TAG,data); if (TextUtils.equals(status, Result.SUCCESS) && users.size() > 0) { //Toast.makeText(getActivity(),"?"+worksInfos.size(),Toast.LENGTH_LONG).show(); Log.i("UserListFragment", new String(responseBody)); rv.setAdapter(new UserListAdapter(getContext(), users)); return; } else if (TextUtils.equals(status, Result.SUCCESS) && users.size() == 0) { noDataView.setVisibility(View.VISIBLE); return; } else if (TextUtils.equals(status, Result.FAILED) && TextUtils.equals(tipCode, "null")) { Log.i("UserListFragment", new String(responseBody)); } else { //Toast.makeText(getActivity(),"??",Toast.LENGTH_LONG).show(); } } @Override public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) { Toast.makeText(getActivity(), "", Toast.LENGTH_LONG).show(); } }); } else { Toast.makeText(getActivity(), "!", Toast.LENGTH_LONG).show(); } } public static class UserListAdapter extends RecyclerView.Adapter<UserListAdapter.ViewHolder> { private final TypedValue mTypedValue = new TypedValue(); private int mBackground; private Context context; private List<User> users; public static class ViewHolder extends RecyclerView.ViewHolder { public final View mView; public final ImageView mImageView; public final TextView mTextView; public ViewHolder(View view) { super(view); mView = view; mImageView = (ImageView) view.findViewById(R.id.avatar); mTextView = (TextView) view.findViewById(R.id.nickname); } } public UserListAdapter(Context context, List<User> users) { context.getTheme().resolveAttribute(R.attr.selectableItemBackground, mTypedValue, true); mBackground = mTypedValue.resourceId; this.context = context; this.users = users; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false); view.setBackgroundResource(mBackground); return new ViewHolder(view); } @Override public void onBindViewHolder(final ViewHolder holder, int position) { final User user = users.get(position); holder.mTextView.setText(user.getNickname()); //?? DisplayImageOptions avatorOptions = new DisplayImageOptions.Builder() .showImageOnLoading(R.drawable.loading_small).showImageOnFail(R.drawable.user) .cacheInMemory(true).cacheOnDisk(true).bitmapConfig(Bitmap.Config.RGB_565).build(); ImageLoader.getInstance().displayImage(user.getAvator(), holder.mImageView, avatorOptions); holder.mView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //Toast.makeText(context,user.toString(),Toast.LENGTH_SHORT).show(); } }); } @Override public int getItemCount() { return users.size(); } } }