如何调整我从 android 库中挑选的图像的大小？
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How to resize an image i picked from the gallery in android?
提问by user1420042
I am building an android where. Inside of one activity I have an image button. When I click on it the gallery opens up and I can choose an image. Then I set that image as the new image for the image button. The problem is the image appears way too big inside my activity. How can I make it fit into my image button?
我正在构建一个android。在一项活动中，我有一个图像按钮。当我点击它时，画廊会打开，我可以选择一个图像。然后我将该图像设置为图像按钮的新图像。问题是图像在我的活动中显得太大了。我怎样才能让它适合我的图像按钮？
protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
switch(requestCode) {
case SELECT_PHOTO:
if(resultCode == RESULT_OK){
Uri selectedImage = imageReturnedIntent.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String filePath = cursor.getString(columnIndex);
cursor.close();
Bitmap yourSelectedImage = BitmapFactory.decodeFile(filePath);
mImageButton.setImageBitmap(yourSelectedImage);
}
}
}
回答by droid8421
You can use this method to get a resized image. This way you can avoid OutOfMemoryError
您可以使用此方法获取调整大小的图像。这样你就可以避免 OutOfMemoryError
public static Bitmap decodeUri(Context c, Uri uri, final int requiredSize)
throws FileNotFoundException {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(c.getContentResolver().openInputStream(uri), null, o);
int width_tmp = o.outWidth
, height_tmp = o.outHeight;
int scale = 1;
while(true) {
if(width_tmp / 2 < requiredSize || height_tmp / 2 < requiredSize)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(c.getContentResolver().openInputStream(uri), null, o2);
}
回答by Shankar Agarwal
Refer this LINK
参考这个链接
Use: Bitmap.createScaledBitmap(Bitmap src, int dstWidth, int dstHeight, boolean filter)
使用：Bitmap.createScaledBitmap(Bitmap src, int dstWidth, int dstHeight, boolean filter)
or use these method::
或使用这些方法::
public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// create a matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
