ImageView旋转后从两侧切割

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: enter image description here

+0

你可以通过动画或矩阵做到这一点。 检查此链接出 http://*.com/questions/8981845/androidrotate-image-in-imageview-by-an-angle – Gyonder 2013-02-26 14:19:42

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); 
    } 
    } 

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


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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。