Question

可能重复：
Android: How to overlay-a-bitmap/draw-over a bitmap?

我在amy应用程序中实现了android Camera功能。

现在我想将任何transperent图像与之前捕获的相机Image相结合，将图像保存到图库中，然后如何完成？

任何代码都会得到真正的回复。感谢。

编辑：我正在使用此代码捕获并保存图像所以，我必须如何实施这些事情。

takePhotoBtn.setOnClickListener(new OnClickListener() {
        public void onClick(View v) { // <5>

            ImageCaptureCallback iccb = null;

            try {
                String filename = timeStampFormat.format(new Date());
                ContentValues values = new ContentValues();
                values.put(Media.TITLE, filename);
                values.put(Media.DESCRIPTION, "Image capture by camera");
                Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);

                iccb = new ImageCaptureCallback( getContentResolver().openOutputStream(uri));

                // to put the Image on captured image.
                Canvas canvas = new Canvas();
                Bitmap kangoo = BitmapFactory.decodeResource(getResources(),
                        R.drawable.icon);
                canvas.drawColor(Color.argb(160, 21, 140, 21));
                canvas.drawBitmap(kangoo, 130, 10, null);


            } catch(Exception ex ){
                ex.printStackTrace();
                Log.e(getClass().getSimpleName(), ex.getMessage(), ex);
            }
          camera.takePicture(mShutterCallback, mPictureCallbackRaw, iccb);
        }
      });


Camera.PictureCallback mPictureCallbackRaw = new Camera.PictureCallback() {
    public void onPictureTaken(byte[] data, Camera c) {
        Log.e(getClass().getSimpleName(), "PICTURE CALLBACK RAW: " + data);
            System.out.println("\n\n\n\nThe Data in mPictureCallbackRaw is :"+data);
        //camera.startPreview(); // Added StastPreview();
    }
};

Camera.PictureCallback mPictureCallbackJpeg= new Camera.PictureCallback() {
    public void onPictureTaken(byte[] data, Camera c) {
        Log.e(getClass().getSimpleName(), "PICTURE CALLBACK JPEG: data.length = " + data);
        System.out.println("\n\n\n\nThe Data in mPictureCallbackJPEG is :"+data);
        camera.startPreview();
    }
};

Camera.ShutterCallback mShutterCallback = new Camera.ShutterCallback() {
    public void onShutter() {
        Log.e(getClass().getSimpleName(), "SHUTTER CALLBACK");
    }
};




public class ImageCaptureCallback implements PictureCallback  {

private OutputStream filoutputStream;
public ImageCaptureCallback(OutputStream filoutputStream) {
    this.filoutputStream = filoutputStream;
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
    try {
        Log.v(getClass().getSimpleName(), "onPictureTaken=" + data + " length = " + data.length);

        filoutputStream.write(data);
        filoutputStream.flush();
        filoutputStream.close();


    } catch(Exception ex) {
        ex.printStackTrace();
    }
}

}

Answer 1

尝试将两个位图组合成相机图像和透明图像。这是SDCard中图像和存储的结合。

public Bitmap combineImages(Bitmap c, Bitmap s) {

        Bitmap cs = null;
        int width, height = 0;

        if (c.getWidth() > s.getWidth()) {
            width = c.getWidth();
            height = c.getHeight();
        } else {
            width = s.getWidth() + s.getWidth();
            height = c.getHeight();
        }

        cs = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

        Canvas comboImage = new Canvas(cs);

        comboImage.drawBitmap(c, 0, 0, null);
        comboImage.drawBitmap(s, 100, 300, null);

        /******
         * 
         *   Write file to SDCard
         * 
         * ****/

        String tmpImg = String.valueOf(System.currentTimeMillis()) + ".png";
        OutputStream os = null;
        try {
            os = new FileOutputStream(Environment.getExternalStorageDirectory()
                    + "/"+tmpImg);
            cs.compress(CompressFormat.PNG, 100, os);
        } catch (IOException e) {
            Log.e("combineImages", "problem combining images", e);
        }
        return cs;
    }

Answer 2

Android实现了多种图像合成算法。这是一种使用它们的简单方法。我没有在这台计算机上进行eclipse，因此以下代码未经测试（但应该可以工作或至少接近工作）。

img1和img2都是位图，其中一个是从相机中捕获的。

1）创建一个新的空位图。我假设img1和img2的大小相同。如果没有，您可以调整它们的大小，或者使这个新的位图具有最大的位图大小。

Bitmap compositeImage = Bitmap.createBitmap(img1.getWidth(),
  img1.getWidth(), img1.getContig());

2）创建一个用于在位图上绘图的画布

Canvas canvas = new Canvas(compositeImage);

3）将第一张图片绘制到新位图

上

Paint paint = new Paint();
canvas.drawBitmap(img1, 0.0f, 0.0f, paint);

4）Android在SDK中有一组合成算法。这些方法以Porter和Duff命名，他写了一篇描述合成图像算法的论文。 Android将此设置称为“transfermode”。要查看可用的Porter-Duff传输模式，请转到http://developer.android.com/reference/android/graphics/PorterDuff.Mode.html或谷歌搜索。根据您的需要，我建议您选择Multiply，Darken和Lighten。

paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.MULTIPLY));

5）现在设置了transfermode，只需绘制第二张图像即可获得想要的效果

canvas.drawBitmap(img2, 0.0f, 0.0f, paint);

现在，compositeImage Bitmap包含组合图像。

编辑。好的，这里是代码放在一起，也许你可以把它放在你的PictureCallback（jpeg一个，而不是原始的）。同样，它没有经过测试，但应该是好的或接近好的：

public void onPictureTaken(byte[] data, Camera camera) {
  Bitmap img1 = BitmapFactory.decodeResource(getResources(), 
    R.drawable.icon); // assuming you really want to use the icon
  Bitmap img2 = BitmapFactory.decodeByteArray(data, 0, data.length);
  Bitmap composite = Bitmap.createBitmap(img2.getWidth(), img2.getHeight(), 
    img2.getConfig());
  Canvas canvas = new Canvas(composite);
  Paint paint = new Paint();
  canvas.drawBitmap(img2, 0.0f, 0.0f, paint);
  paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.MULTIPLY));
  canvas.drawBitmap(img1, 0.0f, 0.0f, paint);

  // It seems you want to insert the new image into the gallery
  ContentValues values = ...
  try {
    Uri imageFileUri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);
    composite.compress(Bitmap.CompressFormat.JPEG, 90, 
      getContentResolver().openOutputStream(imageFileUri));
  } catch(Exception) {
    ...
  }
}

如何在保存之前将任何图像与捕获的相机图像绑定？

2 个答案: