Android 图像处理（类型转换，比例缩放，倒影，圆角）

Java代码





/** 
* 1.放大缩小图片 
*  
* @param bitmap 
* @param w 
* @param h 
* @return 
*/
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {    
int width = bitmap.getWidth();    
int height = bitmap.getHeight();    
    Matrix matrix = new Matrix();    
float scaleWidht = ((float) w / width);    
float scaleHeight = ((float) h / height);    
    matrix.postScale(scaleWidht, scaleHeight);    
    Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,    
            matrix, true);    
return newbmp;    
}    

/** 
* 2.获得圆角图片的方法 
*  
* @param bitmap 
* @param roundPx 
* @return 
*/
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {    
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap    
            .getHeight(), Config.ARGB_8888);    
    Canvas canvas = new Canvas(output);    
final int color = 0xff424242;    
final Paint paint = new Paint();    
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());    
final RectF rectF = new RectF(rect);    
    paint.setAntiAlias(true);    
    canvas.drawARGB(0, 0, 0, 0);    
    paint.setColor(color);    
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);    
    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));    
    canvas.drawBitmap(bitmap, rect, rect, paint);    
return output;    
}    

/** 
* 3.获得带倒影的图片方法 
*  
* @param bitmap 
* @return 
*/
public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {    
final int reflectionGap = 4;    
int width = bitmap.getWidth();    
int height = bitmap.getHeight();    
    Matrix matrix = new Matrix();    
    matrix.preScale(1, -1);    
    Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2,    
            width, height / 2, matrix, false);    
    Bitmap bitmapWithReflection = Bitmap.createBitmap(width,    
            (height + height / 2), Config.ARGB_8888);    
    Canvas canvas = new Canvas(bitmapWithReflection);    
    canvas.drawBitmap(bitmap, 0, 0, null);    
    Paint deafalutPaint = new Paint();    
    canvas    
            .drawRect(0, height, width, height + reflectionGap,    
                    deafalutPaint);    
    canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);    
    Paint paint = new Paint();    
    LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,    
            bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,    
0x00ffffff, TileMode.CLAMP);    
    paint.setShader(shader);    
// Set the Transfer mode to be porter duff and destination in  
    paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));    
// Draw a rectangle using the paint with our linear gradient  
    canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()    
            + reflectionGap, paint);    
return bitmapWithReflection;    
}    

/** 
* 4.将Drawable转化为Bitmap 
*  
* @param drawable 
* @return 
*/
public static Bitmap drawableToBitmap(Drawable drawable) {    
int width = drawable.getIntrinsicWidth();    
int height = drawable.getIntrinsicHeight();    
    Bitmap bitmap = Bitmap.createBitmap(width, height, drawable    
            .getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888    
            : Bitmap.Config.RGB_565);    
    Canvas canvas = new Canvas(bitmap);    
    drawable.setBounds(0, 0, width, height);    
    drawable.draw(canvas);    
return bitmap;    
}   
/**
* 1.放大缩小图片
*
* @param bitmap
* @param w
* @param h
* @return
*/
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidht = ((float) w / width);
float scaleHeight = ((float) h / height);
matrix.postScale(scaleWidht, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,
matrix, true);
return newbmp;
}

/**
* 2.获得圆角图片的方法
*
* @param bitmap
* @param roundPx
* @return
*/
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}

/**
* 3.获得带倒影的图片方法
*
* @param bitmap
* @return
*/
public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
final int reflectionGap = 4;
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2,
width, height / 2, matrix, false);
Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
(height + height / 2), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmapWithReflection);
canvas.drawBitmap(bitmap, 0, 0, null);
Paint deafalutPaint = new Paint();
canvas
.drawRect(0, height, width, height + reflectionGap,
deafalutPaint);
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,
0x00ffffff, TileMode.CLAMP);
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
// Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);
return bitmapWithReflection;
}

/**
* 4.将Drawable转化为Bitmap
*
* @param drawable
* @return
*/
public static Bitmap drawableToBitmap(Drawable drawable) {
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(width, height, drawable
.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, width, height);
drawable.draw(canvas);
return bitmap;
}