Before Snow Falling Effect
Create new Android Project
2. code of main activity:
Project Name: PlayingwithBitmaps
Build Target: Android 2.3.3 //or greater than that
Application Name: PlayingwithBitmaps
Package Name: com.hamad.playingwithbitmaps
Create Activity: Main
Min SDK: 10 // or greater than that
- create main layout:
- One image view to display the image.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#000000" android:id="@+id/rlMain" > <ImageView android:id="@+id/imViewAndroid" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/car" /> </RelativeLayout>
2. code of main activity:
package com.shaikhhamadali.blogspot.playingwithbitmaps; import java.util.Random; import android.os.Bundle; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Color; import android.widget.ImageView; public class Main extends Activity { ImageView imViewAndroid; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); imViewAndroid = (ImageView) findViewById(R.id.imViewAndroid); imViewAndroid.setImageBitmap(applySnowFallingEffect(BitmapFactory.decodeResource(getResources(), R.drawable.beautiful))); } public Bitmap applySnowFallingEffect(Bitmap source) { // get source image size int width = source.getWidth(); int height = source.getHeight(); int[] pixels = new int[width * height]; // get pixel array from source source.getPixels(pixels, 0, width, 0, 0, width, height); // create random object Random random = new Random(); int R, G, B, index = 0, thresHold = 50; // iteration through pixels for(int y = 0; y < height; ++y) { for(int x = 0; x < width; ++x) { // get current index in 2D-matrix index = y * width + x; // get RGB colors R = Color.red(pixels[index]); G = Color.green(pixels[index]); B = Color.blue(pixels[index]); // generate threshold thresHold = random.nextInt(255); if(R > thresHold && G > thresHold && B > thresHold) { pixels[index] = Color.rgb(255, 255,255); } } } // create output bitmap Bitmap bmOut = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); bmOut.setPixels(pixels, 0, width, 0, 0, width, height); return bmOut; } }
3. note that:
- With the help of this,applySnowFallingEffect() method you can apply Snow Falling Filter Effect on image on click,on action_down etc.
- also the algorithm is to generate a threshold number (0-255), if all R,G,B values of a pixel are greater than the threshold, then set the pixel to white.
4. conclusion:
- Some deep information about Snow Falling Filter effect .
- Know how to apply Snow Falling Filter Effect on image bitmap from drawables.
5. About the post:
- By Using the Approach of Randomizing Image pixel, another filter is created,named White/Snow Falling filter.
- The code seems to explain itself due to comments, and is very easy to understand.
- Don’t mind to write a comment whatever you like to ask, to know,to suggest or recommend.
- Hope you enjoy it!
6. Source Code:
you can download the source code here
you can download the source code here
Cheers,
Hamad Ali Shaikh