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 com.comrella.webcomics.navigation; import android.app.ActionBar; import android.app.FragmentTransaction; import android.content.Context; import android.content.Intent; import android.graphics.drawable.Drawable; import android.os.Build; 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.support.v4.view.ViewPager.OnPageChangeListener; import android.util.SparseArray; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.TextView; import com.comrella.webcomics.R; import com.comrella.webcomics.fragment.FavoritesImageListFragment; import com.comrella.webcomics.fragment.ImageListFragment; import com.comrella.webcomics.utility.FragmentLifecycle; import com.mirko.tbv.TabBarView; import com.mirko.tbv.TabBarView.IconTabProvider; public class MainActivity extends FragmentActivity implements ActionBar.TabListener { /** * The {@link android.support.v4.view.PagerAdapter} that will provide fragments for each of the * three primary sections of the app. We use a {@link android.support.v4.app.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}. */ public static final String[] iconImages = new String[] { "cheese_selected", "fav_selected" }; AppSectionsPagerAdapter mAppSectionsPagerAdapter; /** * The {@link ViewPager} that will display the three primary sections of the app, one at a * time. */ ViewPager mViewPager; private TabBarView tabBarView; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Status bar if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS); getWindow().setStatusBarColor(getResources().getColor(R.color.darkpink)); } // Create the adapter that will return a fragment for each of the three primary sections // of the app. mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getSupportFragmentManager()); //Custom tab viewer LayoutInflater inflator = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View v = inflator.inflate(R.layout.custom_ab, null); tabBarView = (TabBarView) v.findViewById(R.id.tab_bar); getActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM); getActionBar().setCustomView(v); // Set up the action bar. // 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(pageChangeListener); tabBarView.setViewPager(mViewPager); } @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; } @Override public boolean onOptionsItemSelected(MenuItem item) { // 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) { Intent sendIntent = new Intent(); sendIntent.setAction(Intent.ACTION_SEND); sendIntent.putExtra(Intent.EXTRA_TEXT, "Get Cheesy Funny Comic Strips on your Android Device. Find us on Play Store! www.comrella.com"); sendIntent.setType("text/plain"); startActivity(Intent.createChooser(sendIntent, getResources().getText(R.string.share_app_title))); } return super.onOptionsItemSelected(item); } private OnPageChangeListener pageChangeListener = new OnPageChangeListener() { int currentPosition = 0; @Override public void onPageSelected(int newPosition) { getActionBar().setSelectedNavigationItem(newPosition); FragmentLifecycle fragmentToHide = (FragmentLifecycle) mAppSectionsPagerAdapter .getItem(currentPosition); fragmentToHide.onPauseFragment(getApplicationContext()); FragmentLifecycle fragmentToShow = (FragmentLifecycle) mAppSectionsPagerAdapter.getItem(newPosition); fragmentToShow.onResumeFragment(getApplicationContext()); currentPosition = newPosition; } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } public void onPageScrollStateChanged(int arg0) { } }; @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()); /* int currentPosition = 0 ; FragmentLifecycle fragmentToHide = (FragmentLifecycle)mAppSectionsPagerAdapter.getItem(currentPosition); fragmentToHide.onPauseFragment(getApplicationContext()); FragmentLifecycle fragmentToShow = (FragmentLifecycle)mAppSectionsPagerAdapter.getItem(tab.getPosition()); fragmentToShow.onResumeFragment(getApplicationContext()); currentPosition = tab.getPosition();*/ } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } /** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to one of the primary * sections of the app. */ public static class AppSectionsPagerAdapter extends FragmentPagerAdapter implements IconTabProvider { private int[] tab_icons = { R.drawable.activity_bar_cheese_x, R.drawable.activity_bar_heart_x, }; private String[] tab_icons_description = { "Daily Cheese", "Favorite Cheese" }; SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>(); 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. if (getRegisteredFragment(i) != null) { return getRegisteredFragment(i); } else { return new ImageListFragment(); } case 1: if (getRegisteredFragment(i) != null) { return getRegisteredFragment(i); } else { return new FavoritesImageListFragment(); } default: // The other sections of the app are dummy placeholders. Fragment fragment = new DummySectionFragment(); Bundle args = new Bundle(); args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, i + 1); fragment.setArguments(args); return fragment; } } @Override public int getCount() { return 2; } @Override public CharSequence getPageTitle(int position) { return tab_icons_description[position]; } @Override public Object instantiateItem(ViewGroup container, int position) { Fragment fragment = (Fragment) super.instantiateItem(container, position); registeredFragments.put(position, fragment); return fragment; } @Override public void destroyItem(ViewGroup container, int position, Object object) { registeredFragments.remove(position); super.destroyItem(container, position, object); } public Fragment getRegisteredFragment(int position) { return registeredFragments.get(position); } @Override public int getPageIconResId(int position) { // TODO Auto-generated method stub return tab_icons[position]; } } /** * A fragment that launches other parts of the demo application. */ public static class LaunchpadSectionFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_section_launchpad, container, false); return rootView; } } /** * A dummy fragment representing a section of the app, but that simply displays dummy text. */ public static class DummySectionFragment extends Fragment { public static final String ARG_SECTION_NUMBER = "section_number"; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_section_dummy, container, false); Bundle args = getArguments(); ((TextView) rootView.findViewById(android.R.id.text1)) .setText(getString(R.string.dummy_section_text, args.getInt(ARG_SECTION_NUMBER))); return rootView; } } }