Android Open Source - GTFSOffline Update Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright 2011 Giles Malet./* w ww  .ja  v a  2  s. c  o m*/
 * Modified 2013 Wilson Brenna.
 *
 * This file is part of GRTransit.
 * 
 * GRTransit is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * GRTransit is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with GRTransit.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.wbrenna.gtfsoffline;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.zip.GZIPInputStream;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.database.sqlite.SQLiteDatabase;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

public class UpdateActivity extends Activity {
  private static final String TAG = "UpdateActivity";

  protected Activity mContext;
  //protected TextView mTitle;
  //protected ProgressBar mProgress;


//  public void runUpdater() {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //new LatestDB().execute();
    mContext = this;
    
    TextView text = new TextView(mContext);
    text.setText("Copying *.db.gz in background! You may close this window.");
    //setContentView(text);
    
    Button btn_close = new Button(mContext);
    btn_close.setText("OK");
    btn_close.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View arg0) {
        mContext.finish();
      }
    });
    
    LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,
        LayoutParams.WRAP_CONTENT);
    //LinearLayout layout = new LinearLayout(mContext);
    LinearLayout mainlayout = new LinearLayout(mContext);
    mainlayout.setOrientation(LinearLayout.VERTICAL);
    mainlayout.addView(text, params);
    mainlayout.addView(btn_close, params);
    setContentView(mainlayout);
    
    new DBMover().execute();
  }

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

  private class DBMover extends AsyncTask<Void, Integer, Void> {

    private boolean alliswell = false;

    @Override
    protected void onPreExecute() {
      //mTitle.setText(R.string.db_copying);
    }

    @Override
    protected void onProgressUpdate(Integer... parms) {
      //mProgress.setProgress(parms[0]);
    }

    @Override
    protected Void doInBackground(Void... foo) {
      
      File myCacheDirectory = mContext.getExternalCacheDir();
      DatabaseHelper mDBHelper = new DatabaseHelper(mContext);
      String myFilesDirectory = mDBHelper.GetDBPath();
      File myFilesFile = new File(myFilesDirectory);
      
      File downloadFolder = Environment.getExternalStoragePublicDirectory
          (Environment.DIRECTORY_DOWNLOADS);
      
      FilenameFilter dbgzFilter = new FilenameFilter() {
        public boolean accept(File dir, String name) {
          Log.v(TAG,"File found: " + name);
          return name.endsWith(".db.gz");
        }
      };
      Log.v(TAG,"Download folder is: " + downloadFolder.getName());
      File[] downloadStrings = downloadFolder.listFiles(dbgzFilter);
      
      //int dwLength = downloadStrings.length;
      //int DBtotal = 0;
      //Toast.makeText(mContext, "Copying, please wait.", Toast.LENGTH_LONG).show();
      
      
      for(File theFile : downloadStrings ) {
        try {
          final int lastDot = theFile.getName().lastIndexOf('.');
          final String fileCachePath = myCacheDirectory.getAbsolutePath() + 
              theFile.getName().substring(0, lastDot) +  ".new";
          Log.v(TAG, theFile.getName());
          final FileOutputStream myOutput = new FileOutputStream(
              fileCachePath);
          final int chunkSize = 8*1024;
          final byte[] buffer = new byte[chunkSize];
          final FileInputStream myInput = new FileInputStream(theFile);
          
  
          // Remote file is zipped, but md5sum is of the uncompressed file.
          final GZIPInputStream zis = new GZIPInputStream(myInput);
  
          int count = 0;
          //final float tot = DBV.getSize() * 1024 * 1024 * 5.0f; // assume roughly 5 to 1 compression
          
          while ((count = zis.read(buffer, 0, chunkSize)) > 0) {
            //DBtotal += count;
            myOutput.write(buffer, 0, count);
            //publishProgress((int) ((DBtotal / dwLength) * 100.0f));
          }
          zis.close();
          
          myOutput.flush();
          myOutput.close();
  
  
          final File o = new File(myFilesFile + "/" + 
              theFile.getName().substring(0, lastDot));
          final File n = new File(fileCachePath);
          o.delete();
          n.renameTo(o);
  
          //DBtotal++;
  
        } catch (final FileNotFoundException e) {
          Log.e(TAG, "FileNotFoundException exception");
          e.printStackTrace();
        } catch (final IOException e) {
          Log.e(TAG, "IOException exception");
          e.printStackTrace();
        } catch (final Exception e) {
          Log.e(TAG, "unknown exception");
          e.printStackTrace();
        }
        
      }
      alliswell = true;
      return null;
    }

    @Override
    protected void onPostExecute(Void foo) {

      if (alliswell) {
        //startFavstops();
        Log.v(TAG,"Finished copying stops!");
        //Toast.makeText(mContext, "Finished!", Toast.LENGTH_LONG).show();
        return;
      }

      final DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int id) {
          switch (id) {
          case DialogInterface.BUTTON_NEGATIVE:
            mContext.finish();
            return;
          }
          dialog.cancel();
          //startFavstops();
          return;
        }
      };

      final AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
      builder.setTitle(R.string.db_is_corrupt)
      .setMessage(R.string.corrupt_exit)
      .setPositiveButton(R.string.cntinue, listener)
      .setNegativeButton(R.string.exit, listener)
      .create()
      .show();
    }
  }
}

Java Source Code List

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