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/*
* Copyright (C) 2016 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.android.emergency;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.support.annotation.LayoutRes;
import android.support.design.widget.TabLayout;
import android.support.design.widget.TabLayout.TabLayoutOnPageChangeListener;
import android.support.design.widget.TabLayout.ViewPagerOnTabSelectedListener;
import android.support.v13.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Pair;
import android.view.MenuItem;
import android.widget.Toolbar;
import com.android.internal.annotations.VisibleForTesting;
import java.util.ArrayList;
/**
* An activity uses a tab layout to separate personal and medical information
* from emergency contacts.
*/
public abstract class EmergencyTabActivity extends Activity {
private ViewPagerAdapter mTabsAdapter;
private TabLayout mTabLayout;
private ArrayList<Pair<String, Fragment>> mFragments;
@Override
protected void onResume() {
super.onResume();
int display_mode = getResources().getConfiguration().orientation;
if (display_mode == Configuration.ORIENTATION_PORTRAIT) {
mTabLayout.setTabMode(TabLayout.MODE_FIXED);
mTabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button.
case android.R.id.home:
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}
/** Returns the index of the currently selected tab. */
@VisibleForTesting
public int getSelectedTabPosition() {
return mTabLayout.getSelectedTabPosition();
}
@Override
public void setContentView(@LayoutRes int layoutResID) {
super.setContentView(layoutResID);
setupTabs();
Toolbar toolbar = (Toolbar) findViewById(R.id.action_bar);
setActionBar(toolbar);
getActionBar().setDisplayHomeAsUpEnabled(true);
}
/** Selects the tab at index {@code selectedTabIndex}. */
public void selectTab(int selectedTabIndex) {
if (mTabLayout != null && selectedTabIndex >= 0 &&
selectedTabIndex < mTabLayout.getTabCount()) {
mTabLayout.getTabAt(selectedTabIndex).select();
}
}
protected void setupTabs() {
mFragments = setUpFragments();
mTabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
if (mTabsAdapter == null) {
// The viewpager that will host the section contents.
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
mTabsAdapter = new ViewPagerAdapter(getFragmentManager());
viewPager.setAdapter(mTabsAdapter);
mTabLayout.setTabsFromPagerAdapter(mTabsAdapter);
// Set a listener via setOnTabSelectedListener(OnTabSelectedListener) to be notified
// when any tab's selection state has been changed.
mTabLayout.setOnTabSelectedListener(
new TabLayout.ViewPagerOnTabSelectedListener(viewPager));
// Use a TabLayout.TabLayoutOnPageChangeListener to forward the scroll and selection
// changes to this layout
viewPager.addOnPageChangeListener(new TabLayoutOnPageChangeListener(mTabLayout));
} else {
mTabsAdapter.notifyDataSetChanged();
mTabLayout.setTabsFromPagerAdapter(mTabsAdapter);
}
}
public TabLayout getTabLayout() {
return mTabLayout;
}
/** Return the fragments. */
@VisibleForTesting
public ArrayList<Pair<String, Fragment>> getFragments() {
return mFragments;
}
/** Return number of fragments to show in the tabs. */
public int getNumberFragments() {
return mFragments.size();
}
/** Return the adapter. */
protected ViewPagerAdapter getTabsAdapter() {
return mTabsAdapter;
}
/** Returns the fragments to show in the tabs. */
protected abstract ArrayList<Pair<String, Fragment>> setUpFragments();
/** The adapter used to handle the two fragments. */
protected class ViewPagerAdapter extends FragmentStatePagerAdapter {
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return mFragments.get(position).second;
}
@Override
public int getCount() {
return mFragments.size();
}
@Override
public CharSequence getPageTitle(int position) {
return mFragments.get(position).first;
}
@Override
public int getItemPosition(Object object) {
// The default implementation assumes that items will never change position and always
// returns POSITION_UNCHANGED. This is how you can specify that the positions can change
return FragmentStatePagerAdapter.POSITION_NONE;
}
}
}
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