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 com.jozapps.MetricConverter; import java.util.ArrayList; import android.content.Intent; import android.content.res.Configuration; import android.content.res.TypedArray; import android.net.Uri; 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.view.View; import android.widget.AdapterView; import android.widget.ListView; import android.widget.Toast; import com.actionbarsherlock.app.SherlockFragmentActivity; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuItem; import com.google.analytics.tracking.android.EasyTracker; /** * This example illustrates a common usage of the DrawerLayout widget in the * Android support library. * <p/> * <p> * When a navigation (left) drawer is present, the host activity should detect * presses of the action bar's Up affordance as a signal to open and close the * navigation drawer. The ActionBarDrawerToggle facilitates this behavior. Items * within the drawer should fall into one of two categories: * </p> * <p/> * <ul> * <li><strong>View switches</strong>. A view switch follows the same basic * policies as list or tab navigation in that a view switch does not create * navigation history. This pattern should only be used at the root activity of * a task, leaving some form of Up navigation active for activities further down * the navigation hierarchy.</li> * <li><strong>Selective Up</strong>. The drawer allows the user to choose an * alternate parent for Up navigation. This allows a user to jump across an * app's navigation hierarchy at will. The application should treat this as it * treats Up navigation from a different task, replacing the current task stack * using TaskStackBuilder or similar. This is the only form of navigation drawer * that should be used outside of the root activity of a task.</li> * </ul> * <p/> * <p> * Right side drawers should be used for actions, not navigation. This follows * the pattern established by the Action Bar that navigation should be to the * left and actions to the right. An action should be an operation performed on * the current contents of the window, for example enabling or disabling a data * overlay on top of the current content. * </p> */ public class MainActivity extends SherlockFragmentActivity { private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; private CharSequence mDrawerTitle; private CharSequence mTitle; 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.drawer_titles_array); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.left_drawer); TypedArray imgs = getResources().obtainTypedArray(R.array.drawer_drawables); ArrayList<DrawerItem> drawerItems = new ArrayList<DrawerItem>(); for (int i = 0; i < mDrawerTitles.length; i++) { DrawerItem di = new DrawerItem(); di.setName(mDrawerTitles[i]); di.setIconID(imgs.getResourceId(i, -1)); drawerItems.add(di); } imgs.recycle(); // 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 mDrawerList.setAdapter(new DrawerItemAdapter(this, R.layout.drawer_list_item, drawerItems)); 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 the proper interactions // between the sliding drawer and the action bar app icon mDrawerToggle = new ActionBarDrawerToggle(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 */ ) { public void onDrawerClosed(View view) { getSupportActionBar().setTitle(mTitle); supportInvalidateOptionsMenu(); // creates call to // onPrepareOptionsMenu() } public void onDrawerOpened(View drawerView) { getSupportActionBar().setTitle(mDrawerTitle); supportInvalidateOptionsMenu(); // creates call to // onPrepareOptionsMenu() } }; mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState == null) { selectItem(0); } // Prompt engaged users to rate app // AppRater.showRateDialog(this, null); AppRater.app_launched(this); } /* 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.setGroupVisible(R.id.group_all, !drawerOpen); return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // The action bar home/up action should open or close the drawer. // ActionBarDrawerToggle will take care of this. if (item.getItemId() == android.R.id.home) { if (mDrawerLayout.isDrawerOpen(mDrawerList)) { mDrawerLayout.closeDrawer(mDrawerList); } else { mDrawerLayout.openDrawer(mDrawerList); } } return super.onOptionsItemSelected(item); } /* The click listner for ListView in the navigation drawer */ private class DrawerItemClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } } /** * Determine which fragment to open when a DrawerItem is clicked. * * @param position - the position of the drawer item in the drawer list */ private void selectItem(int position) { Fragment newFragment; if (position == 0) newFragment = new ConverterFragment(); else if (position == 1) newFragment = new QuickListsFragment(); else newFragment = new RecentFragment(); FragmentManager fragmentManager = getSupportFragmentManager(); fragmentManager.beginTransaction().replace(R.id.content_frame, newFragment).commit(); // update selected item and title, then close the drawer mDrawerList.setItemChecked(position, true); setTitle(mDrawerTitles[position]); mDrawerLayout.closeDrawer(mDrawerList); } @Override public void setTitle(CharSequence title) { mTitle = title; getSupportActionBar().setTitle(mTitle); } /** * 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 toggls mDrawerToggle.onConfigurationChanged(newConfig); } @Override public void onStart() { super.onStart(); EasyTracker.getInstance().activityStart(this); } @Override public void onStop() { super.onStop(); EasyTracker.getInstance().activityStop(this); } public void requestNewUnitEmailIntent() { Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.parse("mailto:support@jozapps.com")); emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, "I would like this unit to be " + "included: " + "\n\n\n\n" + "Version: " + getResources().getString(R.string.VersionNumber)); emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "[Converter] New unit request"); // Search for email clients to display try { startActivityForResult(Intent.createChooser(emailIntent, "Send your email in:"), 0); } catch (android.content.ActivityNotFoundException ex) { Toast.makeText(MainActivity.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show(); } } }