Working with gson parsing in android.

 Follow the steps in this link.you will be able to use the GSON library in android
http://www.javacodegeeks.com/2011/01/android-json-parsing-gson-tutorial.html

How to access a Android database by using a command line.

When your start dealing with a database in your program, it is really important and useful to be able to access it directly, outside your program, to check what the program has just done, and to debug.

And it is important also on Android.

Here is how to do that :

1) Launch the emulator (or connect your real device to your PC ). I usually launch one of my program from Eclipse for this.

2) Launch a command prompt in the android tools directory.

3) type adb shell.

This will launch an unix shell on your emulator / connected device.

4) go to the directory where your database is :

cd data/data

here you have the list of all the applications on your device

Go in your application directory ( beware, Unix is case sensitive !! )

cd com.alocaly.LetterGame

and descend in your databases directory :

cd databases

Here you can find all your databases. In my case, there is only one ( now ) : SCORE_DB

5) Launch sqlite on the database you want to check / change :

sqlite3 SCORE_DB

From here, you can check what tables are present :

.tables

6) enter any SQL instruction you want :

select * from Score;

This is quite simple, but every time I need it, I don't know where to find it.

A basic implementation of SurfaceView

SurfaceView provides a dedicated drawing surface embedded inside of a view hierarchy. You can control the format of this surface and, if you like, its size; the SurfaceView takes care of placing the surface at the correct location on the screen. Access to the underlying surface is provided via the SurfaceHolder interface, which can be retrieved by calling getHolder().

package com.TestSurefaceView;

 

import android.app.Activity;

import android.content.Context;

import android.graphics.Canvas;

import android.os.Bundle;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

 

public class TestSurefaceView extends Activity {

 

MySurfaceView mySurfaceView;

 

   /** Called when the activity is first created. */

   @Override

   public void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       mySurfaceView = new MySurfaceView(this);

       setContentView(mySurfaceView);

   }

   

   @Override

protected void onResume() {

 // TODO Auto-generated method stub

 super.onResume();

 mySurfaceView.onResumeMySurfaceView();

}

 

@Override

protected void onPause() {

 // TODO Auto-generated method stub

 super.onPause();

 mySurfaceView.onPauseMySurfaceView();

}

 

class MySurfaceView extends SurfaceView implements Runnable{

    

    Thread thread = null;

    SurfaceHolder surfaceHolder;

    volatile boolean running = false;

 

 public MySurfaceView(Context context) {

  super(context);

  // TODO Auto-generated constructor stub

  surfaceHolder = getHolder();

 }

 

 public void onResumeMySurfaceView(){

  running = true;

  thread = new Thread(this);

  thread.start();

 }

 

 public void onPauseMySurfaceView(){

  boolean retry = true;

  running = false;

  while(retry){

   try {

    thread.join();

    retry = false;

   } catch (InterruptedException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

   }

  }

 }

 

 @Override

 public void run() {

  // TODO Auto-generated method stub

  while(running){

   if(surfaceHolder.getSurface().isValid()){

    Canvas canvas = surfaceHolder.lockCanvas();

    //... actual drawing on canvas

    

    surfaceHolder.unlockCanvasAndPost(canvas);

   }

  }

 }

    

   }

}

Capture Screen, using View.getDrawingCache()

View screen = (View)findViewById(R.id.screen);

 

screen.setDrawingCacheEnabled(true);

Bitmap bmScreen = screen.getDrawingCache();

how to access sdcard in android Devolpment?

In this example I am accessing AudioRecorder Folder in sdcard.
String filepath = Environment.getExternalStorageDirectory().getPath();
        file = new File(filepath,"AudioRecorder");

        if (!file.exists())
        {
            file.mkdirs();
        }
 String[] a = file.list(new FilenameFilter() {

            @Override
            public boolean accept(File dir, String filename)

            {
                return (filename.endsWith(".mp4") || filename.endsWith(".3gp")||filename.endsWith(".mp3"));

            }
        });

        for (String string : a)

        {

            a1.add(string);

        }