Java tutorial
/* * Copyright 2013 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 circleplus.app; import android.app.Activity; import android.content.Intent; import android.content.res.Configuration; import android.os.Bundle; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarActivity; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import circleplus.app.types.User; import circleplus.app.utils.UserUtils; public class MainActivity extends ActionBarActivity { private static final int REQ_CODE_LOGIN_FAVORITE = 0x1; private static final int REQ_CODE_LOGIN_INFO = 0x2; private static final int REQ_CODE_LOGIN_BUSINESS = 0x3; private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; private CharSequence mTitle; private CharSequence mDrawerTitle; private String[] mDrawerTitles; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTitle = mDrawerTitle = getTitle(); mDrawerTitles = getResources().getStringArray(R.array.titles_array); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.left_drawer); // Set a custom shadow that overlays the main content when the drawer opens mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // TODO: Make a custom ListView adapter, and add a HeaderView to the ListView // Set the drawer's list view with items and click listener mDrawerList .setAdapter(new ArrayAdapter<String>(MainActivity.this, R.layout.drawer_list_item, mDrawerTitles)); mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); // Enable ActionBar app icon to behave as action to toggle nav drawer getSupportActionBar().setDisplayHomeAsUpEnabled(true); getSupportActionBar().setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the proper interactions // between the sliding drawer and the ActionBar app icon mDrawerToggle = new ActionBarDrawerToggle(MainActivity.this, /* host Activity */ mDrawerLayout, /* DrawerLayout object */ R.drawable.ic_drawer, /* nav drawer image to replace "Up" caret */ R.string.drawer_open, /* "open drawer" description for accessibility */ R.string.drawer_close /* "close drawer" description for accessibility */ ) { /** Called when a drawer has settled in a completely closed state */ @Override public void onDrawerClosed(View view) { super.onDrawerClosed(view); getSupportActionBar().setTitle(mTitle); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } /** Called when a drawer has settled in a completely open state */ @Override public void onDrawerOpened(View view) { super.onDrawerOpened(view); getSupportActionBar().setTitle(mDrawerTitle); invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() } }; // Set the drawer toggle as the DrawerListener mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState == null) { selectItem(0); } } // // When using the ActionBarDrawerToggle, you must call it during // onPostCreate() and onConfigurationChanged() // @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Pass any configuration change to the drawer toggle. mDrawerToggle.onConfigurationChanged(newConfig); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } /** * Called whenever we call invalidateOptionsMenu() */ @Override public boolean onPrepareOptionsMenu(Menu menu) { // If the nav drawer is open, hide action items related to the content view boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList); menu.findItem(R.id.action_search).setVisible(!drawerOpen); return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // Pass the event to ActionBarDrawerToggle, if it returns // true, then it has handled the app icon touch event if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView parent, View view, int position, long id) { selectItem(position); } } /** * Swaps fragments in the main content view */ private void selectItem(int position) { // Create a new fragment and specify the content to show based on position Fragment fragment = null; if (position == 0) { fragment = new LocationFragment(); Bundle args = new Bundle(); fragment.setArguments(args); } else if (position == 1) { if (checkLogin(REQ_CODE_LOGIN_FAVORITE)) { fragment = new FavoriteFragment(); } } else if (position == 2) { if (checkLogin(REQ_CODE_LOGIN_INFO)) { fragment = new UserInfoFragment(); } } else if (position == 3) { if (checkLogin(REQ_CODE_LOGIN_BUSINESS) && checkIsBusiness()) { fragment = new BusinessFragment(); } } if (fragment == null) { return; } // Insert the fragment by replacing any existing fragment FragmentManager fragmentManager = getSupportFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, fragment) // .commit(); .commitAllowingStateLoss(); // Highlight the selected item, update the title, and close the drawer mDrawerList.setItemChecked(position, true); setTitle(mDrawerTitles[position]); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void setTitle(CharSequence title) { mTitle = title; getSupportActionBar().setTitle(mTitle); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == Activity.RESULT_OK) { selectItem(requestCode); } } private boolean checkLogin(int requestCode) { if (UserUtils.getUserId(MainActivity.this) < 0L) { Intent intent = new Intent(MainActivity.this, LoginActivity.class); startActivityForResult(intent, requestCode); return false; } return true; } private boolean checkIsBusiness() { User user = UserUtils.getUserInfo(MainActivity.this); if (!user.getIsBusiness()) { Intent intent = new Intent(MainActivity.this, RegisterBusinessActivity.class); startActivityForResult(intent, REQ_CODE_LOGIN_BUSINESS); return false; } return true; } }