在Android中合并两个位图 [英] Merge two bitmaps in android

问题描述

我想合并两个位图，这里是我的代码

  //相机arg转换为Bitmap 
位图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（）; 
} 
  

相机图像应为背景，前景为顶部图像。我试过从
在Android使用Canvas组合2图片，但它没有帮助我。任何想法。？感谢

解决方案

在您的示例中，您忘记添加以下行：

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

在上面的例子中，你不会在画布上绘制你的图像，这是问题。
你可以认为你的画布我的写生。现在你没有画任何东西，你问自己，我看不到任何颜色。

所以，我的建议，首先创建两个位图，然后，做下一件事：

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

您也可以通过首先从位图创建drawable对象，

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

然后当你有drawable对象时，你可以设置边界，您想显示该图片。

  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：
 
 
 
这是一个例子，用这个来理解你的实现：
  Bitmap bitmap = null; 
 try {
 
 bitmap = Bitmap.createBitmap（500，500，Config.ARGB_8888）; 
 Canvas c = new Canvas（bitmap）; 
 resources res = getResources（）; 
 
 
位图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：
 
 
 
 > 
 
I want to merge two bitmaps, here is my code
// 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();
                    }   
The camera image should become background, and foreground as top image. I've tried from 
Combining 2 Images in Android using Canvas  but it didn't help me. Any idea.? Thanks
解决方案
From your example, you forgot to add the next lines:
 comboImage.drawBitmap(c, 0f, 0f, null); 
 comboImage.drawBitmap(s, 0f, c.getHeight(), null);
In your example above you don't draw your image in the canvas, and that is the problem.
You can think that your canvas i your sketchbook. For now you didn't paint anything, and you ask yourself, way I can't see any colors.

So, for my advice, first create the two bitmaps, then, do the next thing:
c.drawBitmap(cameraBitmap, top point, left point, null);
c.drawBitmap(foreground, top point, left point, null); 
You can also do this by first create the drawable objects from your bitmaps, like in the next code: 
Drawable cameraBitmap = BitmapDrawable(cameraBitmap);
Drawable foreground= BitmapDrawable(foreground);
Then when you have the drawable objects, you can set thier bounds, and that way you set where do you want to show that image.
cameraBitmap.setBounds(left, top, right, bottom);
foreground.setBounds(left, top, right, bottom);
and finally draw that on the canvas:
cameraBitmap.draw(canvas);
foreground.draw(canvas);
EDIT:

This is an example, use this to understand your implementation:
    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;
This is what I get from the code above:



                        
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