Gson Json to Arraylist

• Copy below mentioned code and paste in GSONUTILS file
  

  public static <T> ArrayList<T> fromJsontoArrayList(
  String string, Class<T> model)
  {
  
   Gson gson = new GsonBuilder().create();
   T gfromat = null;
   ArrayList<T> localArrayList = new ArrayList<T>();
   try
   {
  
   JSONArray jsonInner = new JSONArray(string);
   int i = 0;
   while (i < jsonInner.length())
   {
   gfromat = gson.fromJson(jsonInner.get(i).toString(), model);
   localArrayList.add(gfromat);
   i++;
  
   }
  
   }
   catch (Exception e)
   {
    Log.e("GsonUtils","Amit exception["+e.getMessage()+"]");
   }
  
   return localArrayList;
  }
  
  

• call this method like this fromJsontoArrayList("jsonstring",beanclass.class)

[KEY : convert file size, readable file size, convert in]

Convert file size to readable format

1. Copy below method
   

   public static String convertSize(long size)
   {
   
   String sizeIn[] = new String[] { "KB", "MB", "GB", "TB" };
   String ret = "";
   if (size >= 1024)
   {
    int devider = 1024;
    int counter = 0;
    while (size / devider > 1024)
    {
     counter++;
     devider *= 1024;
     
    }
    ret = String.format("%.2f", (double) size / devider) + " " + sizeIn[counter];
    
    return ret;
   } else
   {
    ret = size + " bytes";
   }
   return ret;
   }
   

2. Get file length and call above method

   convertSize(new File("file.txt").length())

Merge Two Displayer (Universal Image Loader Android)

1. Create a class named TwoDisplayer
   

   import android.graphics.Bitmap;
   import android.graphics.BitmapShader;
   import android.graphics.Canvas;
   import android.graphics.ColorFilter;
   import android.graphics.Matrix;
   import android.graphics.Paint;
   import android.graphics.PixelFormat;
   import android.graphics.Rect;
   import android.graphics.RectF;
   import android.graphics.Shader;
   import android.graphics.drawable.Drawable;
   import android.view.View;
   import android.view.animation.AlphaAnimation;
   import android.view.animation.DecelerateInterpolator;
   import android.widget.ImageView;
   
   import com.nostra13.universalimageloader.core.assist.LoadedFrom;
   import com.nostra13.universalimageloader.core.display.BitmapDisplayer;
   import com.nostra13.universalimageloader.core.imageaware.ImageAware;
   import com.nostra13.universalimageloader.core.imageaware.ImageViewAware;
   
   
   
   public class TwoDisplayer implements BitmapDisplayer
   {
    protected int cornerRadius;
    protected int margin;
   
    private int durationMillis;
    private boolean animateFromNetwork;
    private boolean animateFromDisk;
    private boolean animateFromMemory;
   
   
    public TwoDisplayer(int cornerRadiusPixels, int fadeInTime){
   
     setCorner(cornerRadiusPixels,0,"");
     setFader(fadeInTime,true,true,true);
   
    }
    public void setCorner(int cornerRadiusPixels, int marginPixels,String dummy) {
     this.cornerRadius = cornerRadiusPixels;
     this.margin = marginPixels;
    }
    public void setFader(int durationMillis, boolean animateFromNetwork,
    boolean animateFromDisk,boolean animateFromMemory) {
     this.durationMillis = durationMillis;
     this.animateFromNetwork = animateFromNetwork;
     this.animateFromDisk = animateFromDisk;
     this.animateFromMemory = animateFromMemory;
    }
    @Override
    public void display(Bitmap bitmap, ImageAware imageAware, LoadedFrom loadedFrom)
    {
   
     if (!(imageAware instanceof ImageViewAware)) {
      throw new IllegalArgumentException("ImageAware should
    wrap ImageView. ImageViewAware is expected.");
     }
     imageAware.setImageDrawable(new RoundedDrawable(bitmap, cornerRadius, margin));
     if ((animateFromNetwork && loadedFrom == LoadedFrom.NETWORK) || (animateFromDisk && loadedFrom == LoadedFrom.DISC_CACHE) ||
       (animateFromMemory && loadedFrom == LoadedFrom.MEMORY_CACHE)) {
      animate(imageAware.getWrappedView(), durationMillis);
     }
    }
   
   
    /**
     * Animates {@link ImageView} with "fade-in" effect
     *
     * @param imageView {@link ImageView} which display image in
     * @param durationMillis The length of the animation in milliseconds
     */
    public static void animate(View imageView, int durationMillis) {
     if (imageView != null) {
      AlphaAnimation fadeImage = new AlphaAnimation(0, 1);
      fadeImage.setDuration(durationMillis);
      fadeImage.setInterpolator(new DecelerateInterpolator());
      imageView.startAnimation(fadeImage);
     }
    }
   
    //=========================RoundedDrawable=======================
    public static class RoundedDrawable extends Drawable {
     protected final float cornerRadius;
     protected final int margin;
     protected final RectF mRect = new RectF(),
       mBitmapRect;
     protected final BitmapShader bitmapShader;
     protected final Paint paint;
     public RoundedDrawable(Bitmap bitmap, int cornerRadius, int margin) {
      this.cornerRadius = cornerRadius;
      this.margin = margin;
      bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
      mBitmapRect = new RectF (margin, margin, bitmap.getWidth() - margin, bitmap.getHeight() - margin);
      paint = new Paint();
      paint.setAntiAlias(true);
      paint.setShader(bitmapShader);
     }
     @Override
     protected void onBoundsChange(Rect bounds) {
      super.onBoundsChange(bounds);
      mRect.set(margin, margin, bounds.width() - margin, bounds.height() - margin);
      // Resize the original bitmap to fit the new bound
      Matrix shaderMatrix = new Matrix();
      shaderMatrix.setRectToRect(mBitmapRect, mRect, Matrix.ScaleToFit.FILL);
      bitmapShader.setLocalMatrix(shaderMatrix);
     }
     @Override
     public void draw(Canvas canvas) {
      canvas.drawRoundRect(mRect, cornerRadius, cornerRadius, paint);
     }
     @Override
     public int getOpacity() {
      return PixelFormat.TRANSLUCENT;
     }
     @Override
     public void setAlpha(int alpha) {
      paint.setAlpha(alpha);
     }
     @Override
     public void setColorFilter(ColorFilter cf) {
      paint.setColorFilter(cf);
     }
    }
   }
   
   

2. Copy and paste above code
3. Call from activity / adapter as below
   

   defaultOptions = new DisplayImageOptions.Builder().cacheOnDisk(true).cacheInMemory(false).imageScaleType(ImageScaleType.EXACTLY).resetViewBeforeLoading(true)
       .displayer(new TwoDisplayer(10, 1000))
   

Dynamically set screen orientation android

Set following code before setting activity layout as follow

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(r.layout.yourlayout);

Remove / Disable activity header android

Just before setting contentview add the following line

requestWindowFeature(Window.FEATURE_NO_TITLE);

Slide ViewPager on button click

You have changed ViewPager's page by sliding it. You can also change page by click on next and previous button.

1. Add two button so called NEXT and PREV in xml.
2. Instantiate these buttons in your activity. And create a global counter as follow

   int globalPosition = 0;

3. Now set next click listener. as follow

   // checking if pager can scroll or not
   boolean can = mPager.canScrollHorizontally(1);
   
   if(can)
   {
    mPager.setCurrentItem(++globalPosition,true);
   }
   
   

4. Set previous button click listener

   boolean can = mPager.canScrollHorizontally(-1);
   if(can)
   {
    mPager.setCurrentItem(--globalPosition,true);
   }
   

5. Dont forget to update globalPosition on ViewPager page sliding.

   mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
    @Override
    public void onPageSelected(int position) {
     globalPosition = position;
    }
   });
   

Android ViewPager

ViewPager is nothing but horizontal scroller for entire screens.

1. Lets begin from xml. Add ViewPager in your xml file. You can copy following code.

   <android.support.v4.view.ViewPager
       xmlns:android="http://schemas.android.com/apk/res/android"
       android:id="@+id/your_pager"
       android:layout_width="match_parent"
       android:layout_height="match_parent" />
       

2. Now move to java file(Activity) create instance for ViewPager added in xml. Make sure this Activity extending FragmentActivity not Activity

   mPager = (ViewPager) findViewById(R.id.your_pager);

3. Now create adapter for pager, create pager instance

   ViewPager mPager;
   PagerAdapter mPagerAdapter;
   public static String [] pageItem = new String[]{"Page 1","Page 2","Page 3"};
    

4. Initialize adapter object and set adapter to ViewPager.

   mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
   mPager.setAdapter(mPagerAdapter);

5. Create slider class which should extend FragmentStatePagerAdapter or FragmentPagerAdapter.

   private class ScreenSlidePagerAdapter extends 
       FragmentStatePagerAdapter 
   {
   public ScreenSlidePagerAdapter(FragmentManager fm) {
    super(fm);
   }
   
   @Override
   public Fragment getItem(int position) {
           //
    return new MyFragment(position);
   }
   
   @Override
   public int getCount() {
    return pageItem.length;
   }
   }

6. Create fragment which will display each screen. It will be slided horizontally.

   public class MyFragment extends Fragment {
    TextView textView;
    int position = 0;
    public MyFragment(int position)
    {
     this.position = position;
    }
           @Override
           public View onCreateView(LayoutInflater inflater, ViewGroup container,
               Bundle savedInstanceState) {
           ViewGroup rootView = (ViewGroup) inflater.inflate(
                   R.layout.my_screen_fragment, container, false);
           
           textView = (TextView)rootView.findViewById(R.id.my_page_tv);
           textView.setText(activityClassObject.pageItem[position]);
           return rootView;
       }
   }