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Zoom in doesn't check trans.
I guess there is a reset image trans after Zoom in:
/**
* 重置图片位置
* */
float dx = 0;
float dy = 0;
float width = getWidth();
float height = getHeight();
mCurrentMatrix.set(getImageMatrix());//初始化Matrix
float[] values = new float[9];
mCurrentMatrix.getValues(values);
if (values[Matrix.MTRANS_X] > 0) {
dx = -values[Matrix.MTRANS_X];
} else if (values[Matrix.MTRANS_X] < -(mImageWidth * values[Matrix.MSCALE_X] - width)) {
dx = -(mImageWidth * values[Matrix.MSCALE_X] - width) - values[Matrix.MTRANS_X];
}
if (values[Matrix.MTRANS_Y] > 0) {
dy = -values[Matrix.MTRANS_Y];
} else if (values[Matrix.MTRANS_Y] < -(mImageHeight * values[Matrix.MSCALE_Y] - height)) {
dy = -(mImageHeight * values[Matrix.MSCALE_Y] - height) - values[Matrix.MTRANS_Y];
}
mCurrentMatrix.postTranslate(dx, dy);
setImageMatrix(mCurrentMatrix);
Doing this is for reset picture trans which out of bounds during zoom in.
源码研究了一下, 兼容性问题还是挺多的.
getSupportedPreviewSize 不同手机 有的是 小到大, 有的是 大到小, 有的是 乱序
setDisplayOrientation(90) 这种写法是错误的,
不是 所有手机 竖屏 拍照 就一定是 90.
我的 LG Nexus 5X 就是 270.
Camera.parameter.setRotation() 也是同理.
等等.... 
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