Android合并两张图片

发布于 2024-11-27 16:57:31 字数 1374 浏览 1 评论 0原文

我想合并两张图像，然后将它们保存在 Android SDCard 上。一张来自相机，一张来自资源文件夹。问题是我收到此错误： Caused by: java.lang.IllegalStateException: 不可变位图传递给 Canvas 构造函数。谢谢。

        Bitmap bottomImage = BitmapFactory.decodeResource(getResources(),R.drawable.blink);
        Bitmap topImage = (Bitmap) data.getExtras().get("data");  

        // As described by Steve Pomeroy in a previous comment, 
        // use the canvas to combine them.
        // Start with the first in the constructor..
        Canvas comboImage = new Canvas(bottomImage);
        // Then draw the second on top of that
        comboImage.drawBitmap(topImage, 0f, 0f, null);

        // bottomImage is now a composite of the two. 

        // To write the file out to the SDCard:
        OutputStream os = null;

        try {
            os = new FileOutputStream("/sdcard/DCIM/Camera/" + "myNewFileName.png");
            bottomImage.compress(CompressFormat.PNG, 50, os);

            //Bitmap image.compress(CompressFormat.PNG, 50, os);
        } catch(IOException e) {
            Log.v("error saving","error saving");
            e.printStackTrace();
        }

设法通过简单地进行此更改来修复它：

        int w = bottomImage.getWidth();
        int h = bottomImage.getHeight(); 
        Bitmap new_image = Bitmap.createBitmap(w, h ,bottomImage.getConfig());

现在的问题是它不保存图像。你知道为什么吗？

原文

I want to merge two images and then save them on the Android SDCard.One is from the camera and one from the resources folder. The problem is that i get this error: Caused by: java.lang.IllegalStateException: Immutable bitmap passed to Canvas constructor. Thanks.

        Bitmap bottomImage = BitmapFactory.decodeResource(getResources(),R.drawable.blink);
        Bitmap topImage = (Bitmap) data.getExtras().get("data");  

        // As described by Steve Pomeroy in a previous comment, 
        // use the canvas to combine them.
        // Start with the first in the constructor..
        Canvas comboImage = new Canvas(bottomImage);
        // Then draw the second on top of that
        comboImage.drawBitmap(topImage, 0f, 0f, null);

        // bottomImage is now a composite of the two. 

        // To write the file out to the SDCard:
        OutputStream os = null;

        try {
            os = new FileOutputStream("/sdcard/DCIM/Camera/" + "myNewFileName.png");
            bottomImage.compress(CompressFormat.PNG, 50, os);

            //Bitmap image.compress(CompressFormat.PNG, 50, os);
        } catch(IOException e) {
            Log.v("error saving","error saving");
            e.printStackTrace();
        }

Managed to fix it by simply doing this change:

        int w = bottomImage.getWidth();
        int h = bottomImage.getHeight(); 
        Bitmap new_image = Bitmap.createBitmap(w, h ,bottomImage.getConfig());

The problem now is that it doesn't saves the image. Do you know why?

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盗琴音 2024-12-04 16:57:31

这会对您有帮助=）

编辑：（嵌入来自链接）

返回可变位图的唯一静态“构造函数”是：

（类：位图） public static Bitmap createBitmap(int width, int
高度，布尔值 hasAlpha)
返回：具有指定宽度和高度的可变位图。

所以你可以使用 getPixels/setPixels 或像这样：

位图 bitmapResult = bm.createBitmap(widthOfOld, heightOfOld, hasAlpha);
画布 c = new Canvas();
c.setDevice(bitmapResult); // drawXY 将在该位图上生成
c.drawBitmap(位图旧，左，上，油漆);

如何从 Bitmap 获取可绘制对象：通过使用扩展了可绘制对象的 BitmapDrawable 子类，如下所示：
```
位图 myBitmap = BitmapFactory.decode(path);
Drawable bd = new BitmapDrawable(myBitmap);
```

This will help you =)

Edit: (embed answer from link)

the only static "constructor" for Bitmap returning a mutable one is:

(Class: Bitmap) public static Bitmap createBitmap(int width, int
height, boolean hasAlpha)
Returns: a mutable bitmap with the specified width and height.

So you could work with getPixels/setPixels or like this:

Bitmap bitmapResult = bm.createBitmap(widthOfOld, heightOfOld, hasAlpha);
Canvas c = new Canvas();
c.setDevice(bitmapResult); // drawXY will result on that Bitmap
c.drawBitmap(bitmapOld, left, top, paint);

how to get the drawable from Bitmap: by using the BitmapDrawable-Subclass which extends Drawable, like this:
```
Bitmap myBitmap = BitmapFactory.decode(path);
Drawable bd = new BitmapDrawable(myBitmap);
```

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