Android notes: image reflection, ReflectionImage

ReflectionImage class code:

Import android. content. context; import android. graphics. bitmap; import android. graphics. bitmap. config; import android. graphics. bitmapFactory; import android. graphics. canvas; import android. graphics. linearGradient; import android. graphics. matrix; import android. graphics. paint; import android. graphics. porterDuff. mode; import android. graphics. porterduxfermode; import android. graphics. shader. tileMode; import android. graphics. drawable. bitmapDrawable; import android. util. attributeSet; import android. widget. imageView; // image Reflection public class ReflectionImage extends ImageView {// whether the Reflection mode is private boolean mReflectionMode = true; public ReflectionImage (Context context) {super (context );} public ReflectionImage (Context context, AttributeSet attrs) {super (context, attrs); // obtain bitmap of the original image and draw BitmapDrawable bd = (BitmapDrawable) this. getDrawable (); Bitmap originalImage = bd. getBitmap (); DoReflection (originalImage);} public ReflectionImage (Context context, AttributeSet attrs, int defStyle) {super (context, attrs, defStyle); Bitmap originalImage = (BitmapDrawable) this. getDrawable ()). getBitmap (); DoReflection (originalImage);} public void setReflectionMode (boolean isRef) {mReflectionMode = isRef;} public boolean getReflectionMode () {return mReflectionMode;} // only expires, the same thing as in the constructor @ Override public void setImageResource (int resId) {Bitmap originalImage = BitmapFactory. decodeResource (getResources (), resId); DoReflection (originalImage); // super. setImageResource (resId);} private void DoReflection (Bitmap originalImage) {final int reflectionGap = 4; // the spacing between the original image and the reflected image int width = originalImage. getWidth (); int height = originalImage. getHeight (); // reverse the Matrix matrix = new Matrix (); matrix. preScale (1,-1); // reflectionImage is the transparent part below. You can set its height to 3/4 of the original height, which improves Bitmap reflectionImage = Bitmap. createBitmap (originalImage, 0, 0, width, height, matrix, false); // create a new bitmap, which is twice the original Bitmap bitmapWithReflection = Bitmap. createBitmap (width, (height + height), Config. ARGB_8888); Canvas canvasRef = new Canvas (bitmapWithReflection); // draw the original image canvasRef first. drawBitmap (originalImage, 0, 0, null); // painting interval Paint deafaultPaint = new Paint (); canvasRef. drawRect (0, height, width, height + reflectionGap, deafaultPaint); // canvasRef of the image after the image is reversed. drawBitmap (reflectionImage, 0, height + reflectionGap, null); // create a gradient mask and put it on the reversed image below Paint = new paint (); linearGradient shader = new LinearGradient (0, originalImage. getHeight (), 0, bitmapWithReflection. getHeight () + reflectionGap, 0x80ffffff, 0x00ffffff, TileMode. CLAMP); // Set the paint to use this shader (linear gradient) paint. setShader (shader); // Set the Transfer mode to be porter duff and destination in paint. setXfermode (new porterduduxfermode (Mode. DST_IN); // Draw a rectangle using the paint with our linear gradient canvasRef. drawRect (0, height, width, bitmapWithReflection. getHeight () + reflectionGap, paint); // call setImageBitmap in ImageView this. setImageBitmap (bitmapWithReflection );}}

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