Android中處理圖像是一件很常見的事情，這里記錄備忘一些親身使用過的處理圖片數據的方法。
轉為Bitmap
RGB值轉Bitmap
private Bitmap createColorBitmap(String rgb, int width, int height) {
Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
int color = Color.parseColor(rgb);
bmp.eraseColor(color);
return bmp;
}
//Usage
Bitmap bmp = createColorBitmap("#cce8cf", 200, 50);
Color值轉Bitmap
private Bitmap createColorBitmap(int color, int width, int height) {
Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bmp.eraseColor(color);
return bmp;
}
//Usage
Bitmap bmp = createColorBitmap(Color.BLUE, 200, 50);
字節數組轉Bitmap
private Bitmap getBitmapFromByteArray(byte[] array) {
return BitmapFactory.decodeByteArray(array, 0, array.length);
}
讀取文件轉Bitmap
private Bitmap getBitmapFromFile(String pathName) {
return BitmapFactory.decodeFile(pathName);
}
讀取資源轉Bitmap
private Bitmap getBitmapFromResource(Resources res, int resId) {
return BitmapFactory.decodeResource(res, resId);
}
輸入流轉Bitmap
private Bitmap getBitmapFromStream(InputStream inputStream) {
return BitmapFactory.decodeStream(inputStream);
}
Drawable轉Bitmap
Bitmap icon = BitmapFactory.decodeResource(context.getResources(),R.drawable.icon_resource);
轉為Drawable
資源轉Drawable
Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);
Bitmap轉Drawable
Drawable d = new BitmapDrawable(getResources(),bitmap);
圖片圓角展示
通過對圖片數據bitmap進行處理即可，其中pixels為邊角的半徑。
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
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);
final float roundPx = pixels;
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;
}
