12

我想合并两个位图，这是我的代码

// Camera arg conversion to Bitmap
                    Bitmap cameraBitmap = BitmapFactory.decodeByteArray(arg0, 0,
                            arg0.length);
                    Bitmap back = Bitmap.createBitmap(cameraBitmap.getWidth(),
                        cameraBitmap.getHeight(), Bitmap.Config.ARGB_8888);
                    Canvas cam = new Canvas(back);
                    cam.drawBitmap(cameraBitmap, matrix, null);


                    // FrameLayout to Bitmap
                    FrameLayout mainLayout = (FrameLayout) findViewById(R.id.frame);
                    Bitmap foreground = Bitmap.createBitmap(mainLayout.getWidth(),
                            mainLayout.getHeight(), Bitmap.Config.ARGB_8888);
                    Canvas c = new Canvas(foreground);
                    mainLayout.draw(c);

                    Bitmap cs = null;
                    cs = Bitmap.createBitmap(foreground.getWidth(), cameraBitmap.getHeight(), Bitmap.Config.ARGB_8888); 

                    Canvas comboImage = new Canvas(cs); 
                    comboImage.drawBitmap(cameraBitmap, 0f, 0f, null); 
                    comboImage.drawBitmap(foreground, 0f, cameraBitmap.getHeight(), null); 

                    FileOutputStream fos = null;
                    try {
                        fos = new FileOutputStream(file);
                        if (fos != null) {
                            cs.compress(Bitmap.CompressFormat.PNG, 90, fos);
                            fos.close();
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

相机图像应成为背景，前景为顶部图像。我已经尝试 使用 Canvas 在 Android 中组合 2 个图像， 但它没有帮助我。任何的想法。？谢谢

4

4 回答 4

31

在您的示例中，您忘记添加下一行：

 comboImage.drawBitmap(c, 0f, 0f, null); 
 comboImage.drawBitmap(s, 0f, c.getHeight(), null);

在上面的示例中，您没有在画布中绘制图像，这就是问题所在。你可以认为你的画布就是你的速写本。现在你什么都没画，你问自己，我看不到任何颜色。

因此，根据我的建议，首先创建两个位图，然后执行以下操作：

c.drawBitmap(cameraBitmap, top point, left point, null);
c.drawBitmap(foreground, top point, left point, null);

你也可以通过首先从你的位图中创建可绘制对象来做到这一点，就像在下面的代码中一样：

Drawable cameraBitmap = BitmapDrawable(cameraBitmap);
Drawable foreground= BitmapDrawable(foreground);

然后，当您拥有可绘制对象时，您可以设置它们的边界，这样您就可以设置要在哪里显示该图像。

cameraBitmap.setBounds(left, top, right, bottom);
foreground.setBounds(left, top, right, bottom);

最后在画布上绘制：

cameraBitmap.draw(canvas);
foreground.draw(canvas);

编辑：

这是一个示例，使用它来了解您的实现：

    Bitmap bitmap = null;
    try {

        bitmap = Bitmap.createBitmap(500, 500, Config.ARGB_8888);
        Canvas c = new Canvas(bitmap);
        Resources res = getResources();


        Bitmap bitmap1 = BitmapFactory.decodeResource(res, R.drawable.test1); //blue

        Bitmap bitmap2 = BitmapFactory.decodeResource(res, R.drawable.test2); //green
        Drawable drawable1 = new BitmapDrawable(bitmap1);
        Drawable drawable2 = new BitmapDrawable(bitmap2);


        drawable1.setBounds(100, 100, 400, 400);
        drawable2.setBounds(150, 150, 350, 350);
        drawable1.draw(c);
        drawable2.draw(c);


    } catch (Exception e) {
    }
    return bitmap;

这是我从上面的代码中得到的：

在此处输入图像描述

于 2012-07-31T12:59:23.467 回答
1

一个大，一个小，垂直合并两个位图
按照这个方法

 public Bitmap finalcombieimage(Bitmap c, Bitmap s) {
    Bitmap cs = null;
    DisplayMetrics metrics = getBaseContext().getResources().getDisplayMetrics();
    int width = metrics.widthPixels;
    int height = metrics.heightPixels;
    cs = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas comboImage = new Canvas(cs);
    Rect dest1 = new Rect(0, 0, width, height); // left,top,right,bottom
    comboImage.drawBitmap(c, null, dest1, null);
    Rect dest2 = new Rect(0, height-400 / 2, width, height);
    comboImage.drawBitmap(s, null, dest2, null);
    return cs;
}

在此处输入图像描述

于 2017-12-07T13:13:33.623 回答
0

请注意，BitmapDrawable(Bitmap) 已被弃用。Kinldy 检查此替代方案。

BitmapDrawable(Bitmap bitmap) 此构造函数在 API 级别 4 中已弃用。BitmapDrawable(Resources, Bitmap)用于确保可绘制对象已正确设置其目标密度。

于 2013-05-06T07:24:08.537 回答
0

将水印图像调整为与原始图像相同的大小 

Uri bmpUri1 = getLocalBitmapUri(ivImage);
Uri bmpUri2 = getLocalBitmapUri(watermark_imageview);

try {
    bm1 = BitmapFactory.decodeStream(
            getContentResolver().openInputStream(bmpUri1));
    bm2 = BitmapFactory.decodeStream(
            getContentResolver().openInputStream(bmpUri2));

    Bitmap bmOverlay = Bitmap.createBitmap(bm1.getWidth(), bm1.getHeight(), bm1.getConfig());
    bm2 = Bitmap.createScaledBitmap(bm2, bm1.getWidth(), bm1.getHeight(),
            true);

    Canvas canvas = new Canvas(bmOverlay);
    canvas.drawBitmap(bm1, 0,0, null);
    canvas.drawBitmap(bm2, 0,0, null);
    watermarkimage.setVisibility(View.GONE);
    im =new ImageView(ImageClick.this);
    im.setImageBitmap(bmOverlay);
    bmpUri = getLocalBitmapUri(im);
} catch (FileNotFoundException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

private Uri getLocalBitmapUri(ImageView imageView) {
    Drawable drawable = imageView.getDrawable();
    Bitmap bmp = null;
    if (drawable instanceof BitmapDrawable){
        bmp = ((BitmapDrawable) imageView.getDrawable()).getBitmap();
    } else {
        return null;
    }
    // Store image to default external storage directory
    Uri bmpUri = null;
    try {
        File file =  new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_DOWNLOADS), "share_image_" + System.currentTimeMillis() + ".png");
        file.getParentFile().mkdirs();
        FileOutputStream out = new FileOutputStream(file);
        bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
        out.close();
        bmpUri = Uri.fromFile(file);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return bmpUri;
}
于 2014-12-12T11:12:16.897 回答