Android - 拟合位图到屏幕

Question

我有这个项目，其中我有一个大于屏幕尺寸的位图。我想调整它以准确地适应屏幕。我没有标题栏，而且处于全屏模式。这是我的非工作代码：

public class ScopView extends View 
{ 
    private Scop thescop; 

    public ScopView(Context context, Scop newscop) 
    { 
     super(context); 
     this.thescop = newscop; 
    } 

    @Override 
    public void onDraw(Canvas canvas) 
    { 
     Bitmap scopeBitmap; 
     BitmapFactory.Options bfOptions = new BitmapFactory.Options(); 
     bfOptions.inDither = false; 
     bfOptions.inPurgeable = true; 
     bfOptions.inInputShareable = true; 
     bfOptions.inTempStorage = new byte[32 * 1024]; 

     scopeBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.scope, bfOptions); 
     scopeBitmap.createScaledBitmap(scopeBitmap, SniperActivity.Width, SniperActivity.Height, false); 
     canvas.drawBitmap(scopeBitmap, SniperActivity.scopx, SniperActivity.scopy, null); 
    } 
} 

虽然在这里createScaledBitmap方法，我使用本身作为源，并从用于检索屏首窗口的高度和宽度的活动有一定变数。

Answer 1

您可以使用下面的代码来调整位图的大小。

int h = 320; // Height in pixels 
int w = 480; // Width in pixels  
Bitmap scaled = Bitmap.createScaledBitmap(largeBitmap, h, w, true); 

Answer 2

此外，您可以使用下面的代码片段。

public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) { 
    int width = bm.getWidth(); 
    int height = bm.getHeight(); 
    float scaleWidth = ((float) newWidth)/width; 
    float scaleHeight = ((float) newHeight)/height; 

    // Create a matrix for the manipulation 
    Matrix matrix = new Matrix(); 

    // Resize the bit map 
    matrix.postScale(scaleWidth, scaleHeight); 

    // Recreate the new Bitmap 
    Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false); 

    return resizedBitmap; 
} 

Answer 3

此代码是帮助你试试这个

int REQ_WIDTH = 0; 
int REQ_HEIGHT = 0; 
REQ_WIDTH =imageView.getWidth(); 
vREQ_HEIGHT =imageView.getHeight(); 
mImageView.setImageBitmap(Bitmap.createScaledBitmap(BitmapFactory.decodeFile(imageURI, options), REQ_HEIGHT, REQ_WIDTH, true));