Java tutorial
/* * Copyright 2015. Alex Zhang aka. ztc1997 * * 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.zprogrammer.tool.ui; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.content.res.Configuration; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.Fragment; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.util.Pair; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ImageView; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; import com.bmob.BmobProFile; import com.bmob.btp.callback.ThumbnailListener; import com.squareup.picasso.Picasso; import com.zprogrammer.tool.R; import com.zprogrammer.tool.bean.MyUser; import com.zprogrammer.tool.util.UiUtil; import java.util.ArrayList; import java.util.HashMap; import java.util.Map; import cn.bmob.v3.BmobUser; /** * Fragment used for managing interactions for and presentation of a navigation drawer. * See the <a href="https://developer.android.com/design/patterns/navigation-drawer.html#Interaction"> * design guidelines</a> for a complete explanation of the behaviors implemented here. */ public class NavigationDrawerFragment extends Fragment { /** * Remember the position of the selected item. */ private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position"; /** * Per the design guidelines, you should show the drawer on launch until the user manually * expands it. This shared preference tracks this. */ private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned"; /** * A pointer to the current callbacks instance (the Activity). */ private NavigationDrawerCallbacks mCallbacks; /** * Helper component that ties the action bar to the navigation drawer. */ private ActionBarDrawerToggle mDrawerToggle; private DrawerLayout mDrawerLayout; private ListView mDrawerListView; private View mFragmentContainerView; private TextView userName; private ImageView userPortraitPic; private int mCurrentSelectedPosition = 0; private boolean mFromSavedInstanceState; private boolean mUserLearnedDrawer; private boolean shouldCallback; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Read in the flag indicating whether or not the user has demonstrated awareness of the // drawer. See PREF_USER_LEARNED_DRAWER for details. SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity()); mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false); if (savedInstanceState != null) { mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION); mFromSavedInstanceState = true; } // Select either the default item (0) or the last selected item. selectItem(++mCurrentSelectedPosition); if (mCallbacks != null) { mCallbacks.onNavigationDrawerItemSelected(mCurrentSelectedPosition); } } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Indicate that this fragment would like to influence the set of actions in the action bar. setHasOptionsMenu(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mDrawerListView = (ListView) inflater.inflate(R.layout.fragment_navigation_drawer, container, false); View view = LayoutInflater.from(getActivity()).inflate(R.layout.header_drawer_main, mDrawerListView, false); mDrawerListView.addHeaderView(view, null, false); userName = (TextView) view.findViewById(R.id.user_name); userPortraitPic = (ImageView) view.findViewById(R.id.user_portrait_pic); final MyUser user = BmobUser.getCurrentUser(getActivity(), MyUser.class); if (user != null) { BmobProFile portraitPic = BmobProFile.getInstance(getActivity()); portraitPic.submitThumnailTask(user.getPortraitPic(), 1, new ThumbnailListener() { @Override public void onSuccess(String thumbnailName, String thumbnailUrl) { Picasso.with(getActivity()).load(thumbnailUrl).into(userPortraitPic); } @Override public void onError(int statuscode, String errormsg) { } }); userName.setText(user.getUsername()); } userPortraitPic.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (user == null) { UiUtil.startActivity(getActivity(), new Intent(getActivity(), LoginActivity.class), new Pair<>(userPortraitPic, "user_portrait_pic")); } } }); mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } }); /* mDrawerListView.setAdapter(new ArrayAdapter<>( getActivity(), android.R.layout.simple_list_item_activated_1, android.R.id.text1, new String[]{ getString(R.string.title_main), getString(R.string.title_search), getString(R.string.title_settings), //getString(R.string.title_write), }));*/ mDrawerListView.setAdapter(getAdapter()); mDrawerListView.setItemChecked(mCurrentSelectedPosition + 1, true); return mDrawerListView; } public boolean isDrawerOpen() { return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView); } public void closeDrawer() { if (mDrawerLayout != null) mDrawerLayout.closeDrawer(mFragmentContainerView); } /** * Users of this fragment must call this method to set up the navigation drawer interactions. * * @param fragmentId The android:id of this fragment in its activity's layout. * @param drawerLayout The DrawerLayout containing this fragment's UI. */ public void setUp(int fragmentId, DrawerLayout drawerLayout, Toolbar toolbar) { mFragmentContainerView = getActivity().findViewById(fragmentId); mDrawerLayout = drawerLayout; // set a custom shadow that overlays the main content when the drawer opens mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // set up the drawer's list view with items and click listener ActionBar actionBar = getActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the navigation drawer and the action bar app icon. mDrawerToggle = new ActionBarDrawerToggle(getActivity(), /* host Activity */ mDrawerLayout, /* DrawerLayout object */ toolbar, R.string.navigation_drawer_open, /* "open drawer" description for accessibility */ R.string.navigation_drawer_close /* "close drawer" description for accessibility */ ) { @Override public void onDrawerClosed(View drawerView) { super.onDrawerClosed(drawerView); if (!isAdded()) { return; } getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu() if (shouldCallback && mCallbacks != null) { mCallbacks.onNavigationDrawerItemSelected(mCurrentSelectedPosition); shouldCallback = false; } } @Override public void onDrawerOpened(View drawerView) { super.onDrawerOpened(drawerView); if (!isAdded()) { return; } if (!mUserLearnedDrawer) { // The user manually opened the drawer; store this flag to prevent auto-showing // the navigation drawer automatically in the future. mUserLearnedDrawer = true; SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity()); sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply(); } getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu() } }; // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer, // per the navigation drawer design guidelines. if (!mUserLearnedDrawer && !mFromSavedInstanceState) { mDrawerLayout.openDrawer(mFragmentContainerView); } // Defer code dependent on restoration of previous instance state. mDrawerLayout.post(new Runnable() { @Override public void run() { mDrawerToggle.syncState(); } }); mDrawerLayout.setDrawerListener(mDrawerToggle); } private void selectItem(int position) { if (mDrawerListView != null && position < 4) { mDrawerListView.setItemChecked(position, true); } if (mDrawerLayout != null) { mDrawerLayout.closeDrawer(mFragmentContainerView); } //?header?? mCurrentSelectedPosition = position - 1; shouldCallback = true; } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { mCallbacks = (NavigationDrawerCallbacks) activity; } catch (ClassCastException e) { throw new ClassCastException("Activity must implement NavigationDrawerCallbacks."); } } @Override public void onDetach() { super.onDetach(); mCallbacks = null; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Forward the new configuration the drawer toggle component. mDrawerToggle.onConfigurationChanged(newConfig); } /** * Per the navigation drawer design guidelines, updates the action bar to show the global app * 'context', rather than just what's in the current screen. */ private void showGlobalContextActionBar() { ActionBar actionBar = getActionBar(); actionBar.setDisplayShowTitleEnabled(true); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setTitle(R.string.app_name); } private ActionBar getActionBar() { return ((AppCompatActivity) getActivity()).getSupportActionBar(); } private ListAdapter getAdapter() { ArrayList<Map<String, Object>> maps = new ArrayList<>(); Map<String, Object> map0 = new HashMap<>(); map0.put("icon", R.drawable.ic_item_drawer_main_home); map0.put("title", getString(R.string.title_main)); maps.add(map0); Map<String, Object> map1 = new HashMap<>(); map1.put("icon", R.drawable.ic_item_drawer_main_favorites); map1.put("title", getString(R.string.title_favorites)); maps.add(map1); Map<String, Object> map2 = new HashMap<>(); map2.put("icon", R.drawable.ic_item_drawer_main_settings); map2.put("title", getString(R.string.title_settings)); maps.add(map2); return new SimpleAdapter(getActivity(), maps, R.layout.item_list_drawer_main, new String[] { "icon", "title" }, new int[] { R.id.drawer_icon, R.id.drawer_title }); } /** * Callbacks interface that all activities using this fragment must implement. */ public interface NavigationDrawerCallbacks { /** * Called when an item in the navigation drawer is selected. */ void onNavigationDrawerItemSelected(int position); } }