我正在處理兩個問題,試圖在Android應用程序中顯示Gallery中的照片。我想要做的很簡單:從畫廊獲取一張照片,並將其放入MainActivity中的ImageView(100dp * 100dp)中。如何正確顯示位圖?
第一個問題是,在某些電話上,如索尼Xperia,照片在ImageView上設置時會旋轉。爲了解決這個問題,我發現這是一段代碼蘇答案:
public Bitmap decodeFile(String path)
{
int orientation;
try {
if (path == null) {
return null;
}
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 70;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 0;
while (true) {
if (width_tmp/2 < REQUIRED_SIZE
|| height_tmp/2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale++;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
Bitmap bm = BitmapFactory.decodeFile(path, o2);
Bitmap bitmap = bm;
ExifInterface exif = new ExifInterface(path);
orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
Log.e("ExifInteface .........", "rotation =" + orientation);
// exif.setAttribute(ExifInterface.ORIENTATION_ROTATE_90, 90);
Log.e("orientation", "" + orientation);
Matrix m = new Matrix();
if ((orientation == ExifInterface.ORIENTATION_ROTATE_180)) {
m.postRotate(180);
// m.postScale((float) bm.getWidth(), (float) bm.getHeight());
// if(m.preRotate(90)){
Log.e("in orientation", "" + orientation);
bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),
bm.getHeight(), m, true);
return bitmap;
} else if (orientation == ExifInterface.ORIENTATION_ROTATE_90) {
m.postRotate(90);
Log.e("in orientation", "" + orientation);
bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),
bm.getHeight(), m, true);
return bitmap;
} else if (orientation == ExifInterface.ORIENTATION_ROTATE_270) {
m.postRotate(270);
Log.e("in orientation", "" + orientation);
bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),
bm.getHeight(), m, true);
return bitmap;
}
return bitmap;
} catch (Exception e) {
return null;
}
}
完美的作品,但我也希望圖像是一個正方形,這是不是這樣的了。
爲了做到這一點,我用我的位圖的第一個方法後,我也叫一個:
public static Bitmap cropToSquare(Bitmap bitmap)
{
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int newWidth = (height > width) ? width : height;
int newHeight = (height > width)? height - (height - width) : height;
int crop = (width - height)/2;
crop = (crop < 0)? 0: crop;
Bitmap cropImg = Bitmap.createBitmap(bitmap, crop, 0, newWidth, newHeight);
return cropImg;
}
它確實開啓了位圖成正方形,但問題是它削減照片,而不是重新調整它。 (基本上一半的圖像丟失)
我很確定我想要做的事很簡單,我該怎麼做?
它完美,謝謝。 – Kritias 2015-04-04 13:42:14