ImageView旋轉後從兩側切割

Question

我有一個自定義的ImageView。我想以某種角度旋轉我的圖像視圖。下面是它的onDraw（）方法：

canvas.save(); 
canvas.rotate(currentAngle,getWidth()/2,getHeight()/2); 
super.onDraw(canvas); 

的圖像是旋轉，但問題是旋轉之後，圖像是從側面切割。如何避免這種切割的東西？

樣品截圖：

Answer 1

嘗試下面的代碼：

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); 
    } 
    } 

Answer 2

曾經我有一個類似的問題。我決定了這個問題，即 的方式。我在放大圖像，使其看起來像

---

| _ __ | | | | | | | _ | | | _ __ _ |

半寬圖像左右添加。一半高度增加了頂部和底部。新的空間填充一些顏色，或做alapha運河等於+ 0.當你旋轉圖像，你需要削減多餘。我沒有這樣做，但我希望這可以幫助你。