android - Android - 使位图适合屏幕

Question

我有这个项目，其中我的位图大于屏幕尺寸。我想调整它的大小以完全适合屏幕。我没有标题栏，并且处于全屏模式。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);
    }
}

虽然在这里使用 createScaledBitmap 方法，但我将其自身用作源，并且活动中的一些变量用于从屏幕首选项中检索窗口高度和宽度。

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

此代码可帮助您尝试此操作

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));