com.musevisions.android.SudokuSolver.SudokuLoaderActivity.java Source code

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Here is the source code for com.musevisions.android.SudokuSolver.SudokuLoaderActivity.java

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/**
 * JSON Sudoku solver is covered under the Creative Commons Attribution 3.0 Unported License
 * http://creativecommons.org/licenses/by/3.0/
 * 
 * @author: Andrea Bizzotto {@link www.musevisions.com}, {@link www.bizzotto.biz}
 * @email: bizz84dev@gmail.com
 */
package com.musevisions.android.SudokuSolver;

import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TabHost;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

/** Class to load available Sudoku games from remote URL.
 * This class uses a List View to hold a list of Sudoku games retrieved from the main server.
 *   
 * @author andrea
 *
 */
public class SudokuLoaderActivity extends Activity implements SudokuRetrieverTask.SudokuRetrieverPreparedListener {

    //private static final String TAG = "SudokuLoaderActivity";
    private SudokuRetriever mRetriever;
    private ListView mListView;
    private TextView mTextView;

    private MainTabActivity mMainActivity;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.loader);

        mMainActivity = (MainTabActivity) getParent();
        mMainActivity.setLoaderActivity(this);

        mTextView = (TextView) findViewById(R.id.textInfo);

        mListView = (ListView) findViewById(R.id.listView);
        mListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                PuzzleHolder holder = (PuzzleHolder) mListView.getAdapter().getItem(position);
                //Toast.makeText(SudokuLoaderActivity.this, holder.name, Toast.LENGTH_SHORT);

                mMainActivity.getSolverActivity().updateView(holder.puzzle, holder.name);
                TabHost tabHost = (TabHost) getParent().findViewById(android.R.id.tabhost);
                tabHost.setCurrentTab(0);
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        updateResults();
    }

    private void updateResults() {
        if (HttpPostUtils.isConnected(this)) {
            mTextView.setVisibility(View.GONE);
            mRetriever = new SudokuRetriever();
            (new SudokuRetrieverTask(mRetriever, this)).execute();
        } else {
            mTextView.setVisibility(View.VISIBLE);
            mTextView.setText("Check Internet Connection");
        }
    }

    private void updateView(JSONArray results) {
        ListView lv = (ListView) findViewById(R.id.listView);

        /* Fill list with all json files */
        ArrayList<PuzzleHolder> list = new ArrayList<PuzzleHolder>();
        for (int i = 0; i < results.length(); i++) {
            try {
                JSONObject obj = results.getJSONObject(i);
                JSONArray names = obj.names();
                String name = names.getString(0);
                JSONArray array = obj.getJSONArray(name);
                int puzzle[] = JSONHelper.toIntArray(array);
                if (puzzle != null)
                    list.add(new PuzzleHolder(name, puzzle));
                //Log.v(TAG, "File: " + name);
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        lv.setAdapter(new ListArrayAdapter(this, list));
    }

    @Override
    public void onSudokuRetrieverPrepared() {
        updateView(mRetriever.getContents());
    }

    private class PuzzleHolder {
        String name;
        int puzzle[];

        public PuzzleHolder(String name, int puzzle[]) {
            this.name = name;
            this.puzzle = puzzle;
        }
    }

    // http://www.vogella.com/articles/AndroidListView/article.html#ownadapter_viewHolder
    private class ListArrayAdapter extends ArrayAdapter<PuzzleHolder> {

        Activity activity;
        List<PuzzleHolder> data;

        public ListArrayAdapter(Activity context, List<PuzzleHolder> data) {
            super(context, R.layout.row_layout, data);
            this.activity = context;
            this.data = data;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View rowView = convertView;
            if (rowView == null) {
                try {
                    LayoutInflater inflater = activity.getLayoutInflater();
                    rowView = inflater.inflate(R.layout.row_layout, null);
                } catch (InflateException ex) {

                    ex.printStackTrace();
                    return null;
                }
            }

            TextView label = (TextView) rowView.findViewById(R.id.textLabel);
            PuzzleHolder holder = data.get(position);

            label.setText(holder.name);

            rowView.setTag(label);

            return rowView;
        }
    }

}