Question

在我的一个应用程序中，我需要进行屏蔽（将1个图像重叠到另一个图像）

在我的应用程序中，我必须将1个图像（位图）加载到imageview然后必须将一些fram应用于该图像我已经使用了另一个imageview ...这是完全正常工作

我的问题是...... 当我要保存位图时...... 使用这段代码

public static Bitmap overlay(Bitmap bmp1, Bitmap bmp2) {
        Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth(), bmp1.getHeight(), bmp1.getConfig());
        Canvas canvas = new Canvas(bmOverlay);
        canvas.drawBitmap(bmp1, new Matrix(), null);
        canvas.drawBitmap(bmp2, 0, 0, null);

        ByteArrayOutputStream bytes = new ByteArrayOutputStream();

        bmOverlay.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
        File f = new File(Environment.getExternalStorageDirectory()
                + File.separator
                + "test.jpg");
        try {
            f.createNewFile();
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());
        } catch (IOException e) {
            e.printStackTrace();
        }

        return bmOverlay;
    }

我收到了 this

但我需要它像

This

Answer 1

到目前为止，我发现的最好的是这一个：

public Bitmap overlay(Bitmap bmp1, Bitmap bmp2) {
        Bitmap bmOverlay = Bitmap.createBitmap(bmp2.getWidth(), bmp2.getHeight(), bmp1.getConfig());
        float left =(bmp2.getWidth() - (bmp1.getWidth()*((float)bmp2.getHeight()/(float)bmp1.getHeight())))/(float)2.0;
        float bmp1newW = bmp1.getWidth()*((float)bmp2.getHeight()/(float)bmp1.getHeight());
        Bitmap bmp1new = getResizedBitmap(bmp1, bmp2.getHeight(), (int)bmp1newW);
        Canvas canvas = new Canvas(bmOverlay);
        canvas.drawBitmap(bmp1new, left ,0 , null);
        canvas.drawBitmap(bmp2, new Matrix(), null);
        return bmOverlay;
    }

    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;
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
        return resizedBitmap;
    }

Answer 2

public static Bitmap overlay(Bitmap bmp1, Bitmap bmp2) {
    Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth(), bmp1.getHeight(), bmp1.getConfig());
    Canvas canvas = new Canvas(bmOverlay);
    canvas.drawBitmap(bmp1, new Matrix(), null);

    // determine the width of the canvas
    int canvasWidth = canvas.getWidth();
    int canvasHeight = canvas.getHeight();  

    //resize your bmp2
    Bitmap resized = Bitmap.createScaledBitmap(bmp2, canvasWidth, canvasHeight, true);

    // determine the centre of the canvas
    int centreX = (canvasWidth  - resized .getWidth()) /2;
    int centreY = (canvasHeight - resized .getHeight()) /2 

   // This code can be used to alter the opacity of the image being overlayed.
   //http://stackoverflow.com/a/12235235/1635441
   //http://stackoverflow.com/a/5119093/1635441        
   //Paint p = new Paint();
   //p.setXfermode(new PorterDuffXfermode(Mode.DST_ATOP)); //http://stackoverflow.com/a/17553502/1635441
   //p.setAlpha(180);
   //p.setARGB(a, r, g, b);

   //canvas.drawBitmap(resized, centreX, centreY, p);  

    //canvas.drawBitmap(bmp2, 0, 0, null);
    canvas.drawBitmap(resized, centreX, centreY, null);

    ByteArrayOutputStream bytes = new ByteArrayOutputStream();

    bmOverlay.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
    File f = new File(Environment.getExternalStorageDirectory()
            + File.separator
            + "test.jpg");
    try {
        f.createNewFile();
        FileOutputStream fo = new FileOutputStream(f);
        fo.write(bytes.toByteArray());
    } catch (IOException e) {
        e.printStackTrace();
    }

    return bmOverlay;
}

android覆盖1位图到另一个图像没有得到正确的输出

2 个答案: