基于Android 实现图片平移、缩放、旋转同时进行

} /**

* 图片居中显示、判断旋转角度小于（90 * x + 45）度图片旋转（90 * x）度大于则旋转（90 * (x+1)） */

private void centerAndRotate() { RectF rect = new RectF(0, 0, imgWidth, imgHeight);

matrix.mapRect(rect); float width = rect.width();

float height = rect.height(); float dx = 0;

float dy = 0; if (width 2 - width / 2 - rect.left;

} else if (rect.left > 0) { dx = -rect.left;

} else if (rect.right if (height 2 - height / 2 - rect.top; } else if (rect.top > 0) {

dy = -rect.top; } else if (rect.bottom if (rotation != 0) {

int rotationNum = (int) (rotation / 90); float rotationAvai = new BigDecimal(rotation % 90).setScale(1, BigDecimal.ROUND_HALF_UP).floatValue();

float realRotation = 0; if (rotation > 0) {

realRotation = rotationAvai > 45 ? (rotationNum + 1) * 90 : rotationNum * 90; } else if (rotation 0) {

realRotation = rotationAvai 45 ? (rotationNum - 1) * 90 : rotationNum * 90; }

System.out.println("realRotation: " + realRotation); matrix.postRotate(realRotation, displayWidth / 2, displayHeight / 2);

rotation = 0; }

} /**

* 显示网络图片时使用 */

private class MyTask extends AsyncTaskFile, File, Bitmap> { Bitmap bitmap;

String path; int scale = 1;

long size; @Override

protected Bitmap doInBackground(File... params) { // TODO Auto-generated method stub

try { size = params[0].length();