Java tutorial
/* * Copyright 2012 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 edu.tcfsh.arrivinglaterecordapp; import edu.tcfsh.arrivinglaterecordapp.R; import android.app.ActionBar; import android.app.AlertDialog; import android.app.AlertDialog.Builder; import android.app.FragmentTransaction; import android.content.Context; import android.content.DialogInterface; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.view.ViewPager; import android.widget.Toast; public class MainActivity extends FragmentActivity implements ActionBar.TabListener, SearchingStudentFragment.OnSearchingResultSelectedListener, ArrivingLateRecordFragment.OnArrivingLateRecordSelectedListener { AppSectionsPagerAdapter mAppSectionsPagerAdapter; private Bundle bundle; private int dayOfMonth; private int month; private int year; ViewPager mViewPager; static ArrivingLateRecordFragment arrivingLateRecordFragment; Builder savingFileAlertDialog; Builder leavingActivityDialog; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main_activity); getBundle(); arrivingLateRecordFragment = new ArrivingLateRecordFragment(dayOfMonth, month, year); // Create the adapter that will return a fragment for each of the three // primary sections // of the app. mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getSupportFragmentManager()); leavingActivityDialog = new AlertDialog.Builder(this, AlertDialog.THEME_HOLO_LIGHT); leavingActivityDialog.setTitle("??"); leavingActivityDialog.setMessage("?"); leavingActivityDialog.setPositiveButton("", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { savingFileAlertDialog.show(); } }); leavingActivityDialog.setNegativeButton("?", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { } }); savingFileAlertDialog = new AlertDialog.Builder(this, AlertDialog.THEME_HOLO_LIGHT); savingFileAlertDialog.setTitle("??"); savingFileAlertDialog.setMessage("?????"); savingFileAlertDialog.setPositiveButton("", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { arrivingLateRecordFragment.saveArrivingLateRecordFile(); finish(); } }); savingFileAlertDialog.setNegativeButton("?", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { finish(); } }); // Set up the action bar. final ActionBar actionBar = getActionBar(); // Specify that the Home/Up button should not be enabled, since there is // no hierarchical // parent. actionBar.setHomeButtonEnabled(false); // Specify that we will be displaying tabs in the action bar. actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); // Set up the ViewPager, attaching the adapter and setting up a listener // for when the // user swipes between sections. mViewPager = (ViewPager) findViewById(R.id.pager); mViewPager.setAdapter(mAppSectionsPagerAdapter); mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { // When swiping between different app sections, select // the corresponding tab. // We can also use ActionBar.Tab#select() to do this if // we have a reference to the // Tab. actionBar.setSelectedNavigationItem(position); } }); // For each of the sections in the app, add a tab to the action bar. for (int i = 0; i < mAppSectionsPagerAdapter.getCount(); i++) { // Create a tab with text corresponding to the page title defined by // the adapter. // Also specify this Activity object, which implements the // TabListener interface, as the // listener for when this tab is selected. actionBar.addTab( actionBar.newTab().setText(mAppSectionsPagerAdapter.getPageTitle(i)).setTabListener(this)); } } @Override public void onStudentRecordSelected(StudentRecord studentRecord) { if (arrivingLateRecordFragment.updateList(studentRecord)) { showToast(studentRecord.toString() + " ?!"); } else { showToast(studentRecord.toString() + " \n?"); } } private void getBundle() { bundle = this.getIntent().getExtras(); dayOfMonth = bundle.getInt("DayOfMonth"); month = bundle.getInt("Month"); year = bundle.getInt("Year"); } @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { // When the given tab is selected, switch to the corresponding page in // the ViewPager. mViewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } public static class AppSectionsPagerAdapter extends FragmentPagerAdapter { public AppSectionsPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int i) { switch (i) { case 0: // The first section of the app is the most interesting -- it // offers // a launchpad into the other demonstrations in this example // application. return new SearchingStudentFragment(); case 1: // The first section of the app is the most interesting -- it // offers // a launchpad into the other demonstrations in this example // application. return arrivingLateRecordFragment; default: // The other sections of the app are dummy placeholders. return new SearchingStudentFragment(); } } @Override public int getCount() { return 2; } @Override public CharSequence getPageTitle(int position) { switch (position) { case 0: return "/?"; case 1: // The first section of the app is the most interesting -- it // offers // a launchpad into the other demonstrations in this example // application. return "?"; default: // The other sections of the app are dummy placeholders. return "dummy"; } } } private void showToast(String msg) { Context context = getApplicationContext(); CharSequence text = msg; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(context, text, duration); toast.show(); } @Override public void onBackPressed() { leavingActivityDialog.show(); } @Override public void onSaveFileButtonSelected(String msg) { showToast(msg); } }