Android Open Source - KeyIndicatorsAndroid Category List View

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License

The source code is released under:

This software is copyright to Benjamin Johnson, and should not be redistributed or modified without my permission. For modification and redistribution inquiries please email bjohnson.lane at gmail dot...

Java Source Code

package com.blanksketchstudios.keyindicators;
//from  ww  w.  ja v  a 2 s  .  c o m
import java.io.IOException;

import android.annotation.TargetApi;
import android.app.ActionBar;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.blanksketchstudios.keyindicators.Model.DataMaster;
import com.blanksketchstudios.keyindicators.Model.Indicator;

public class CategoryListView extends FragmentActivity implements ActionBar.OnNavigationListener {

    /**
     * The serialization (saved instance state) Bundle key representing the
     * current dropdown position.
     */
    private static final String STATE_SELECTED_NAVIGATION_ITEM = "selected_navigation_item";
    private DataMaster dataMaster;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(KIGlobals.LogTag,"On Create");
        setContentView(R.layout.activity_category_list_view);

        // Set up the action bar to show a dropdown list.
        final ActionBar actionBar = getActionBar();
        actionBar.setDisplayShowTitleEnabled(false);
        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_list_item_1,
                        android.R.id.text1,
                        new String[] {
                                getString(R.string.title_section1),
                                getString(R.string.title_section2),
                                getString(R.string.title_section3),
                        }),
                this);
        loadPageData();
    }
    /**
     * The button callback
     */
    public void testSave(View view){
      Log.d(KIGlobals.LogTag, "in TestSave");
      Indicator newIndicator = dataMaster.createNewIndicator("None");
      newIndicator.save(this);
    }
    /**
     * This method is called when the user taps the Add Category button at the top of the screen
     * @param view
     */
    public boolean addCategoryActionCallback(MenuItem menuItem){
      Log.d(KIGlobals.LogTag, "in addCategory");
      //Let's open a "category name dialogue"
      final AlertDialog.Builder alert = new AlertDialog.Builder(this);
        final EditText input = new EditText(this);
        input.setHint("New category name");
        alert.setView(input);
        alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                String value = input.getText().toString().trim();
                if (value.equals("")){
                  Toast.makeText(getApplicationContext(), "No name given, operation aborted", Toast.LENGTH_SHORT).show();
                }
                else{
                  createNewCategory(value);
                  Toast.makeText(getApplicationContext(), "Created new category: "+value, Toast.LENGTH_SHORT).show();
                }
            }
        });

        alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                dialog.cancel();
            }
        });
        alert.show();
        return true;
    }
    /**
     * This method is called when the user taps "OK" on the add category dialogue
     * @param categoryName : The name of the new category being created, if this category is blank, then no category is created
     */
    private void createNewCategory(String categoryName){
      //A new category is created by creating a new indicator with the new category set as its category
      //Note that it doesn't make sense to create an empty category, so this works nicely
      if (!categoryName.equals("")){
      Indicator newIndicator = dataMaster.createNewIndicator(categoryName);
      newIndicator.save(this);
      //reload the page
      loadPageData(); //Do we need to consider the amount of time that this might take?
      }
    }
    
    private void loadPageData(){
      //Get a handle on the DataMaster
        try {
        dataMaster = DataMaster.getDataMasterInstance(this);
        } catch(IOException e){
          //fail gracefully
          Log.e(KIGlobals.LogTag,"Caught IOException in CategoryListView onCreate");
        }
        //Let's make sure we've actually got an indicator created, if not show a tutorial image
        if (dataMaster.getNumberOfIndicators() == 0){
          //Display the tutorial image, and skip everything else by returning from this method
          /*TODO: Display tutorial image here */
          Log.d(KIGlobals.LogTag,"No indicators");
          return;
        }
        //Populate the Category list view with each category
        ListView categoryListView = (ListView)findViewById(R.id.categoryListView);
        ArrayAdapter<String> categoryListViewAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, dataMaster.getCategories());
        categoryListView.setAdapter(categoryListViewAdapter);
    }
    /**
     * Backward-compatible version of {@link ActionBar#getThemedContext()} that
     * simply returns the {@link android.app.Activity} if
     * <code>getThemedContext</code> is unavailable.
     */
    @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) {
        // Restore the previously serialized current dropdown position.
        if (savedInstanceState.containsKey(STATE_SELECTED_NAVIGATION_ITEM)) {
            getActionBar().setSelectedNavigationItem(
                    savedInstanceState.getInt(STATE_SELECTED_NAVIGATION_ITEM));
        }
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        // Serialize the current dropdown position.
        outState.putInt(STATE_SELECTED_NAVIGATION_ITEM,
                getActionBar().getSelectedNavigationIndex());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.category_list_view, menu);
        return true;
    }
    
    @Override
    public boolean onNavigationItemSelected(int position, long id) {
        // When the given dropdown item is selected, show its contents in the
        // container view.
        Fragment fragment = new DummySectionFragment();
        Bundle args = new Bundle();
        args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
        fragment.setArguments(args);
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.container, fragment)
                .commit();
        return true;
    }

    /**
     * A dummy fragment representing a section of the app, but that simply
     * displays dummy text.
     */
    public static class DummySectionFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        public static final String ARG_SECTION_NUMBER = "section_number";

        public DummySectionFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_category_list_view_dummy, container, false);
            TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);
            dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
            return rootView;
        }
    }

}

Java Source Code List

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