Two ways to rotate bitmap Android

Method 1. Using Bitmap.createbitmap

Bitmap Adjustphotorotation (Bitmap BM, final int orientationdegree) {

Matrix M = new Matrix ();
M.setrotate (Orientationdegree, (float) bm.getwidth ()/2, (float) bm.getheight ()/2);

try {

Bitmap BM1 = bitmap.createbitmap (BM, 0, 0, bm.getwidth (), Bm.getheight (), M, true);

return BM1;

} catch (OutOfMemoryError ex) {
}

return null;

}

Method 2. Using Canvas.drawbitmap

Bitmapadjustphotorotation (Bitmap BM, final int orientationdegree) {

Matrix M = new Matrix ();
M.setrotate (Orientationdegree, (float) bm.getwidth ()/2, (float) bm.getheight ()/2);
float Targetx, targety;
if (Orientationdegree = = 90) {
Targetx = Bm.getheight ();
targety = 0;
} else {
Targetx = Bm.getheight ();
Targety = Bm.getwidth ();
}

Final float[] values = new float[9];
M.getvalues (values);

float x1 = values[matrix.mtrans_x];
float y1 = values[matrix.mtrans_y];

M.posttranslate (targetx-x1, targety-y1);

Bitmap bm1 = Bitmap.createbitmap (Bm.getheight (), Bm.getwidth (), Bitmap.Config.ARGB_8888);

Paint paint = new paint ();
Canvas canvas = new canvas (BM1);
Canvas.drawbitmap (BM, m, paint);

return BM1;
}

Performance test:

1. Mobile phone

cpu:mtk6575, 1G Hz

Mem:512mb

Os:andoid 2.3.7

2. Picture size 1632 * 1224

Results:

1. Method 1 in 280-350 milliseconds, Method 2 is around 110 milliseconds.

2. Method 2 is better than Method 1

Two ways to rotate bitmap Android