Before highlight effect
After highlight effect
Create new Android Project
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
1. 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/beautiful" /> </RelativeLayout>
package com.shaikhhamadali.blogspot.playingwithbitmaps; import android.os.Bundle; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.BlurMaskFilter; import android.graphics.PorterDuff; import android.graphics.BlurMaskFilter.Blur; import android.graphics.Canvas; import android.graphics.Paint; 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(highlightImage(BitmapFactory.decodeResource(getResources(), R.drawable.android_droid))); } public Bitmap highlightImage(Bitmap src) { // create new bitmap, which will be painted and becomes result image Bitmap bmOut = Bitmap.createBitmap(src.getWidth() + 96, src.getHeight() + 96, Bitmap.Config.ARGB_8888); // setup canvas for painting Canvas canvas = new Canvas(bmOut); // setup default color canvas.drawColor(0, PorterDuff.Mode.CLEAR); // create a blur paint for capturing alpha Paint ptBlur = new Paint(); ptBlur.setMaskFilter(new BlurMaskFilter(15, Blur.NORMAL)); int[] offsetXY = new int[2]; // capture alpha into a bitmap Bitmap bmAlpha = src.extractAlpha(ptBlur, offsetXY); // create a color paint Paint ptAlphaColor = new Paint(); ptAlphaColor.setColor(0xFFFFFFFF); // paint color for captured alpha region (bitmap) canvas.drawBitmap(bmAlpha, offsetXY[0], offsetXY[1], ptAlphaColor); // free memory bmAlpha.recycle(); // paint the image source canvas.drawBitmap(src, 0, 0, null); // return out final image return bmOut; } }
3. note that:
- with the help of this,highlightImage() method you can highlight image on click,on action_down etc
4. conclusion:
- Know how to highlight an image bitmap from drawables.
5. about the post:
- 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
Cheers,
you can download the source code here
Hamad Ali Shaikh