Java tutorial
/* * Copyright (C) 2014 The Illinois-Indiana Sea Grant * * 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 org.iisgcp.waterwalk.activity; import org.iisgcp.waterwalk.R; import org.iisgcp.waterwalk.fragment.PointOfInterestGridViewPagerFragment; import org.iisgcp.waterwalk.fragment.PointOfInterestMapFragment; import org.iisgcp.waterwalk.utils.Constants; import org.iisgcp.waterwalk.utils.OnItemClickedListener; import org.iisgcp.waterwalk.utils.OnPageSelectedListener; import android.annotation.TargetApi; import android.os.Bundle; import android.content.Context; import android.content.Intent; import android.os.Build; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v7.app.ActionBar; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.WindowManager; import android.widget.ArrayAdapter; import android.widget.TextView; public class PointOfInterestActivity extends NavigationDrawerActivity implements ActionBar.OnNavigationListener, OnItemClickedListener, OnPageSelectedListener { /** * The serialization (saved instance state) Bundle key representing the * current dropdown position. */ private static final String STATE_SELECTED_NAVIGATION_ITEM = "selected_navigation_item"; private static final String STATE_SELECTED_PAGE_POSITION = "selected_page_position"; private String mTag; private int mPosition = -1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); setContentView(R.layout.activity_point_of_interest); // Set up the action bar. final ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayShowCustomEnabled(true); actionBar.setDisplayShowTitleEnabled(false); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setHomeButtonEnabled(true); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST); // Set up the dropdown list navigation in the action bar. actionBar.setListNavigationCallbacks( // Specify a SpinnerAdapter to populate the dropdown list. new ArrayAdapter<String>(getActionBarThemedContextCompat(), android.R.layout.simple_dropdown_item_1line, android.R.id.text1, new String[] { getString(R.string.title_grid), getString(R.string.title_map) }), this); LayoutInflater inflator = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); View view = inflator.inflate(R.layout.actionbar, null); actionBar.setCustomView(view); setTitle(getIntent().getExtras().getString(Constants.INTENT_TITLE)); mPosition = getIntent().getIntExtra(Constants.INTENT_POSITION, -1); if (savedInstanceState == null) { actionBar.setSelectedNavigationItem(getIntent().getIntExtra(Constants.INTENT_TAB, 0)); } } @Override public void setTitle(CharSequence title) { TextView view = (TextView) findViewById(R.id.title); view.setText(title); } @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) private Context getActionBarThemedContextCompat() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { return getActionBar().getThemedContext(); } else { return this; } } @Override public void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); // Restore the previously serialized current dropdown position. if (savedInstanceState.containsKey(STATE_SELECTED_NAVIGATION_ITEM)) { getSupportActionBar().setSelectedNavigationItem( Integer.valueOf(savedInstanceState.getString(STATE_SELECTED_NAVIGATION_ITEM))); mTag = savedInstanceState.getString(STATE_SELECTED_NAVIGATION_ITEM); } if (savedInstanceState.containsKey(STATE_SELECTED_PAGE_POSITION)) { mPosition = savedInstanceState.getInt(STATE_SELECTED_PAGE_POSITION); } } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); // Serialize the current dropdown position. outState.putString(STATE_SELECTED_NAVIGATION_ITEM, mTag); outState.putInt(STATE_SELECTED_PAGE_POSITION, mPosition); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: Intent intent = new Intent(this, MainActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); return true; default: return super.onOptionsItemSelected(item); } } @Override public boolean onNavigationItemSelected(int position, long id) { FragmentManager fragmentManager = getSupportFragmentManager(); Fragment fragment = getSupportFragmentManager().findFragmentByTag(mTag); if (fragment != null) { fragmentManager.beginTransaction().detach(fragment).commit(); } String tag = String.valueOf(position); fragment = getSupportFragmentManager().findFragmentByTag(tag); if (fragment == null) { if (position == 0) { fragment = PointOfInterestGridViewPagerFragment.newInstance(mPosition); } else if (position == 1) { fragment = PointOfInterestMapFragment.newInstance(mPosition); } getSupportFragmentManager().beginTransaction().add(R.id.content, fragment, tag).commit(); } else { if (position == 0) { fragment = PointOfInterestGridViewPagerFragment.newInstance(mPosition); getSupportFragmentManager().beginTransaction().replace(R.id.content, fragment, tag).commit(); } else if (position == 1) { ((PointOfInterestMapFragment) fragment).update(mPosition); getSupportFragmentManager().beginTransaction().attach(fragment).commit(); } } mTag = tag; return true; } @Override public void onItemClicked(Intent intent) { startActivity(intent); } @Override public void onPageSelected(int position) { mPosition = position; } }