DragUtility.java

package eoc.studio.voicecard.utils;

import android.content.ClipData;
import android.content.Context;
import android.content.res.Resources;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.View.DragShadowBuilder;

public class DragUtility
{
	public static final String LABLE_STAMP = "I am stamp";
	public static final String LABLE_TO_TRASH = "Try to trash";
	
	public static  void dragView(View view, String dragKey, String dragContext)
	{
		ClipData data = ClipData.newPlainText(dragKey, dragContext);
		DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
		view.startDrag(data, shadowBuilder, view, 0);
	}
	
	/**
	 * This method converts dp unit to equivalent pixels, depending on device density. 
	 * 
	 * @param dp A value in dp (density independent pixels) unit. Which we need to convert into pixels
	 * @param context Context to get resources and device specific display metrics
	 * @return A float value to represent px equivalent to dp depending on device density
	 */
	public static float convertDpToPixel(float dp, Context context){
	    Resources resources = context.getResources();
	    DisplayMetrics metrics = resources.getDisplayMetrics();
	    float px = dp * (metrics.densityDpi / 160f);
	    return px;
	}

	/**
	 * This method converts device specific pixels to density independent pixels.
	 * 
	 * @param px A value in px (pixels) unit. Which we need to convert into db
	 * @param context Context to get resources and device specific display metrics
	 * @return A float value to represent dp equivalent to px value
	 */
	public static float convertPixelsToDp(float px, Context context){
	    Resources resources = context.getResources();
	    DisplayMetrics metrics = resources.getDisplayMetrics();
	    float dp = px / (metrics.densityDpi / 160f);
	    return dp;
	}


}