ImageView旋转后从两侧切割
问题描述:
我有一个自定义的ImageView。我想以某种角度旋转我的图像视图。下面是它的onDraw()方法:ImageView旋转后从两侧切割
canvas.save();
canvas.rotate(currentAngle,getWidth()/2,getHeight()/2);
super.onDraw(canvas);
的图像是旋转,但问题是旋转之后,图像是从侧面切割。如何避免这种切割的东西?
样品截图:
答
尝试下面的代码:
public class bitmaptest extends Activity {
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
LinearLayout linLayout = new LinearLayout(this);
// load the origial BitMap (500 x 500 px)
Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.android);
int width = bitmapOrg.width();
int height = bitmapOrg.height();
int newWidth = 200;
int newHeight = 200;
// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) newWidth)/width;
float scaleHeight = ((float) newHeight)/height;
// createa matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// rotate the Bitmap
matrix.postRotate(45);
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
width, height, matrix, true);
// make a Drawable from Bitmap to allow to set the BitMap
// to the ImageView, ImageButton or what ever
BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);
ImageView imageView = new ImageView(this);
// set the Drawable on the ImageView
imageView.setImageDrawable(bmd);
// center the Image
imageView.setScaleType(ScaleType.CENTER);
// add ImageView to the Layout
linLayout.addView(imageView,
new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT
)
);
// set LinearLayout as ContentView
setContentView(linLayout);
}
}
答
曾经我有一个类似的问题。我决定了这个问题,即 的方式。我在放大图像,使其看起来像
| _ __ | | | | | | | _ | | | _ __ _ |
半宽图像左右添加。一半高度增加了顶部和底部。新的空间填充一些颜色,或做alapha运河等于+ 0.当你旋转图像,你需要削减多余。我没有这样做,但我希望这可以帮助你。
你可以通过动画或矩阵做到这一点。 检查此链接出 http://stackoverflow.com/questions/8981845/androidrotate-image-in-imageview-by-an-angle – Gyonder 2013-02-26 14:19:42