如何在android中获取Imageview像素

Question

在我的项目中,我希望pick image from gallery用户可以触摸该图像pixel color store into my db.

问题:

它会给我例外: y must be <bitmap.height()

logcat的:

07-22 16:38:59.406: E/AndroidRuntime(6139): java.lang.IllegalArgumentException: y must be < bitmap.height()
07-22 16:38:59.406: E/AndroidRuntime(6139):     at android.graphics.Bitmap.checkPixelAccess(Bitmap.java:788)
07-22 16:38:59.406: E/AndroidRuntime(6139):     at android.graphics.Bitmap.getPixel(Bitmap.java:740)
07-22 16:38:59.406: E/AndroidRuntime(6139):     at com.example.mycolorreader.PhotoActivity$2.onTouch(PhotoActivity.java:121)
07-22 16:38:59.406: E/AndroidRuntime(6139):     at android.view.View.dispatchTouchEvent(View.java:3762)
07-22 16:38:59.406: E/AndroidRuntime(6139):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
07-22 16:38:59.406: E/AndroidRuntime(6139):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
07-22 16:38:59.406: E/AndroidRuntime(6139):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
07-22 16:38:59.406: E/AndroidRuntime(6139):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
07-22 16:38:59.406: E/AndroidRuntime(6139):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1671)

码:

final Bitmap bitmap = ((BitmapDrawable) ivPhoto.getDrawable()).getBitmap();
ivPhoto.setOnTouchListener(new OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
        int x = (int) event.getX();
        int y = (int) event.getY();
        int pixel = bitmap.getPixel(x, y);

我尝试更多的事情,如设置填充,设置图像布局动态,但总是得到这个例外.

我在Stack溢出和谷歌搜索很多但没有获得积极的回应.

请给我一些想法.

Answer 1

事件的x/y是触摸坐标.要获得触摸位图的像素,我们应该首先将它们转换为位图坐标.这个程序在这里描述得非常好.