Android Open Source - ChicagoWaterWalk-Android Main Activity

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License

The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright (C) 2014 The Illinois-Indiana Sea Grant
 */* w  ww.  j a va  2  s .  c o m*/
 * 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.AllRoutesFragment;
import org.iisgcp.waterwalk.fragment.RoutesGridFragment;
import org.iisgcp.waterwalk.fragment.RoutesMapFragment;
import org.iisgcp.waterwalk.utils.Constants;
import org.iisgcp.waterwalk.utils.HelpDialog;
import org.iisgcp.waterwalk.utils.HelpDialog.HelpDialogListener;

import android.annotation.TargetApi;
import android.os.Bundle;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.res.Configuration;
import android.os.Build;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity implements
    ActionBar.OnNavigationListener,
    HelpDialogListener {

  private static final String HELP_DIALOG = "help_dialog";
  
  /**
   * The serialization (saved instance state) Bundle key representing the
   * current dropdown position.
   */
  private static final String STATE_SELECTED_NAVIGATION_ITEM = "selected_navigation_item";

  private String mTag;
  
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;
  
    private String [] mDrawerTitles;
    
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setContentView(R.layout.activity_main);
    
    mDrawerTitles = getResources().getStringArray(R.array.drawer_items);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.left_drawer);

    // set a custom shadow that overlays the main content when the drawer opens
    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
    // set up the drawer's list view with items and click listener
    mDrawerList.setAdapter(new ArrayAdapter<String>(this,
        R.layout.drawer_list_item, mDrawerTitles));
    mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

    // 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(getString(R.string.title_routes));
    
        // ActionBarDrawerToggle ties together the the proper interactions
        // between the sliding drawer and the action bar app icon
        mDrawerToggle = new ActionBarDrawerToggle(
                this,                  /* host Activity */
                mDrawerLayout,         /* DrawerLayout object */
                R.drawable.ic_drawer,  /* nav drawer image to replace 'Up' caret */
                R.string.drawer_open,  /* "open drawer" description for accessibility */
                R.string.drawer_close  /* "close drawer" description for accessibility */
                ) {
          
            public void onDrawerClosed(View view) {
              if (mDrawerList.getCheckedItemPosition() == 0) {
                    setTitle(mDrawerTitles[0]);
                getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
              } else {
                    setTitle(mDrawerTitles[1]);
                getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
              }
            }

            public void onDrawerOpened(View drawerView) {
                setTitle(getString(R.string.app_name));
              getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
            }
        };
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        if (savedInstanceState == null) {
            selectItem(0);
        }
        
        SharedPreferences prefs = getPreferences(Context.MODE_PRIVATE);
        
        if (!prefs.contains(Constants.INTENT_DRAWER_POSITION)) {
            mDrawerLayout.closeDrawer(mDrawerList);
          mDrawerLayout.openDrawer(Gravity.LEFT);
          showDialog(HELP_DIALOG);
        }
  }

  @Override
  public void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    
    if (intent == null) {
      return;
    }
    
    int position = intent.getIntExtra(Constants.INTENT_DRAWER_POSITION, -1);
    
    if (position != -1) {
            selectItem(position);
    }
    
    setIntent(null);
  }
  
  @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)) {
      int position = Integer.valueOf(savedInstanceState.getString(STATE_SELECTED_NAVIGATION_ITEM));
      
      if (position == 0 || position == 1) {
        getSupportActionBar().setSelectedNavigationItem(
            Integer.valueOf(savedInstanceState.getString(STATE_SELECTED_NAVIGATION_ITEM)));
      } else {
          getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
      }
      mTag = savedInstanceState.getString(STATE_SELECTED_NAVIGATION_ITEM);
    }
  }

  @Override
  public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    // Serialize the current dropdown position.
    outState.putString(STATE_SELECTED_NAVIGATION_ITEM, mTag);
  }

  @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 = new RoutesGridFragment();
            } else if (position == 1) {
              fragment = new RoutesMapFragment();
            }
        
            getSupportFragmentManager().beginTransaction()
            .add(R.id.content, fragment, tag).commit();
      } else {
        fragmentManager.beginTransaction().attach(fragment).commit();
      }
      
      mTag = tag;
      
      return true;
    }
  
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
         // The action bar home/up action should open or close the drawer.
         // ActionBarDrawerToggle will take care of this.
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        // Handle action buttons
        switch(item.getItemId()) {
          default:
            return super.onOptionsItemSelected(item);
        }
    }

    /* The click listener for ListView in the navigation drawer */
    private class DrawerItemClickListener implements ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            selectItem(position);
        }
    }

    private void selectItem(int position) {
        // update the main content by replacing fragments
      FragmentManager fragmentManager = getSupportFragmentManager();
    Fragment fragment = getSupportFragmentManager().findFragmentByTag(mTag);
    if (fragment != null) {
      fragmentManager.beginTransaction().detach(fragment).commit();
    }
      
      if (position == 0) {
        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);

        // Set up the dropdown list navigation in the action bar.
        getSupportActionBar().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);
        
        setTitle(getString(R.string.title_routes));
      } else {
        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        
         String tag = String.valueOf(2);
          fragment = getSupportFragmentManager().findFragmentByTag(tag);
          
          if (fragment == null) {
                fragment = new AllRoutesFragment();
            
                getSupportFragmentManager().beginTransaction()
                .add(R.id.content, fragment, tag).commit();
          } else {
            fragmentManager.beginTransaction().attach(fragment).commit();
          }
        
        setTitle(getString(R.string.title_all_stops));
        mTag = tag;
      }
      
        // update selected item and title, then close the drawer
        mDrawerList.setItemChecked(position, true);
        mDrawerLayout.closeDrawer(mDrawerList);
    }

    /**
     * When using the ActionBarDrawerToggle, you must call it during
     * onPostCreate() and onConfigurationChanged()...
     */

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggls
        mDrawerToggle.onConfigurationChanged(newConfig);
    }
    
    private void showDialog(String tag) {
        // in a transaction.  We also want to remove any currently showing
        // dialog, so make our own transaction and take care of that here.
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        Fragment prev = getSupportFragmentManager().findFragmentByTag(tag);
        if (prev != null) {
            ft.remove(prev);
        }

        Fragment fragment = HelpDialog.newInstance(this, getString(R.string.welcome), getString(R.string.help_text));
        
        ft.add(0, fragment, tag);
        ft.commit();
    }

  @Override
  public void onHelpDialogClosed(DialogFragment dialog) {
        mDrawerLayout.closeDrawer(mDrawerList);
        SharedPreferences prefs = getPreferences(Context.MODE_PRIVATE);
      Editor editor = prefs.edit();
      editor.putString(Constants.INTENT_DRAWER_POSITION, Constants.INTENT_DRAWER_POSITION);
      editor.commit();
  }
}
Java Source Code List
