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MainActivity.java
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MainActivity.java
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/*
* Copyright 2015 Department of Computer Science and Engineering, University of Moratuwa.
* 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 lk.ac.mrt.cse.dbs.simpleexpensemanager.ui;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import lk.ac.mrt.cse.dbs.simpleexpensemanager.R;
import lk.ac.mrt.cse.dbs.simpleexpensemanager.control.ExpenseManager;
import lk.ac.mrt.cse.dbs.simpleexpensemanager.control.InMemoryDemoExpenseManager;
public class MainActivity extends AppCompatActivity {
private ExpenseManager expenseManager;
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
/*** Begin generating dummy data for In-Memory implementation ***/
expenseManager = new InMemoryDemoExpenseManager();
/*** END ***/
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return the respective fragment.
switch (position) {
case 0:
return ManageExpensesFragment.newInstance(expenseManager);
case 1:
return AddAccountFragment.newInstance(expenseManager);
case 2:
return ExpenseLogsFragment.newInstance(expenseManager);
default:
return ManageExpensesFragment.newInstance(expenseManager);
}
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return getString(R.string.label_manage);
case 1:
return getString(R.string.label_add_account);
case 2:
return getString(R.string.label_logs);
default:
return getString(R.string.label_manage);
}
}
}
}