在android中组合两个png文件
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combining two png files in android
提问by John
I have two png image files that I would like my android app to combine programmatically into one png image file and am wondering if it is possible to do so? if so, what I would like to do is just overlay them on each other to create one file.
我有两个 png 图像文件，我希望我的 android 应用程序以编程方式将它们组合成一个 png 图像文件，我想知道是否可以这样做？如果是这样，我想做的就是将它们相互叠加以创建一个文件。
the idea behind this is that I have a handful of png files, some with a portion of the image on the left with the rest transparent and the others with an image on the right and the rest transparent. and based on user input it will combine the two to make one file to display. (and i cant just display the two images side by side, they need to be one file)
这背后的想法是，我有一些 png 文件，其中一些图像的一部分在左侧，其余部分透明，而其他图像在右侧，其余部分透明。并根据用户输入将两者结合起来制作一个文件来显示。（我不能只是并排显示两个图像，它们需要是一个文件）
is this possible to do programmatically in android and how so?
这是否可以在 android 中以编程方式进行？
回答by Ehxor
I've been trying to figure this out for a little while now.
我一直试图弄清楚这一点。
Here's (essentially) the code I used to make it work.
这是（基本上）我用来使它工作的代码。
// Get your images from their files
Bitmap bottomImage = BitmapFactory.decodeFile("myFirstPNG.png");
Bitmap topImage = BitmapFactory.decodeFile("myOtherPNG.png");
// 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);
// comboImage 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");
comboImage.compress(CompressFormat.PNG, 50, os)
} catch(IOException e) {
e.printStackTrace();
}
EDIT :
编辑 ：
there was a typo, So, I've changed
有一个错字，所以，我已经改变了
image.compress(CompressFormat.PNG, 50, os)
image.compress(CompressFormat.PNG, 50, os)
to
到
bottomImage.compress(CompressFormat.PNG, 50, os)
bottomImage.compress(CompressFormat.PNG, 50, os)
回答by Viet
You can do blending. This is not particular to Android. It's just universal image processing.
你可以做混合。这不是 Android 特有的。它只是通用的图像处理。
EDIT:
编辑：
You may find these articles & samples & code useful:
您可能会发现这些文章、示例和代码很有用：
http://kfb-android.blogspot.com/2009/04/image-processing-in-android.html
http://kfb-android.blogspot.com/2009/04/image-processing-in-android.html
http://code.google.com/p/jjil/
回答by abolfazl bazghandi
I use this code
我用这个代码
private class PhotoComposition extends AsyncTask<Object, Void, Boolean> {
private String pathSave;//path save combined images
@Override
protected Boolean doInBackground(Object... objects) {
List<String> images = (List<String>) objects[0]; //lsit of path iamges
pathSave = (String) objects[1];//path save combined images
if (images.size() == 0) {
return false;
}
List<Bitmap> bitmaps = new ArrayList<>();
for (int i = 0; i < images.size(); i++) {
bitmaps.add(BitmapFactory.decodeFile( images.get(i)));
}
int width = findWidth(bitmaps);//Find the width of the composite image
int height = findMaxHeight(bitmaps);//Find the height of the composite image
Bitmap combineBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);//create bitmap of composite image
combineBitmap.eraseColor(Color.parseColor("#00000000")); //bcakgraound color of composite image
Bitmap mutableCombineBitmap = combineBitmap.copy(Bitmap.Config.ARGB_8888, true);//create mutable bitmap to create canvas
Canvas canvas = new Canvas(mutableCombineBitmap);// create canvas to add bitmaps
float left = 0f;
for (int i = 0; i < bitmaps.size(); i++) {
canvas.drawBitmap(bitmaps.get(i), left, 0f, null);//Taking photos horizontally
left += bitmaps.get(i).getWidth();//Take right to the size of the previous photo
}
OutputStream outputStream = null;
try {
outputStream = new FileOutputStream(pathSave);//path of save composite image
mutableCombineBitmap.compress(Bitmap.CompressFormat.PNG, 80, outputStream);
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}
@Override
protected void onPostExecute(Boolean isSave) {
if (isSave) {
//iamge save on pathSave
Log.i("PhotoComposition", "onPostExecute: " + pathSave);
}
super.onPostExecute(isSave);
}
private int findMaxHeight(List<Bitmap> bitmaps) {
int maxHeight = Integer.MIN_VALUE;
for (int i = 0; i < bitmaps.size(); i++) {
if (bitmaps.get(i).getHeight() > maxHeight) {
maxHeight = bitmaps.get(i).getHeight();
}
}
return maxHeight;
}
private int findWidth(List<Bitmap> bitmaps) {
int width = 0;
for (int i = 0; i < bitmaps.size(); i++) {
width += bitmaps.get(i).getWidth();
}
return width;
}
USAGE
用法
List<String> images = new ArrayList<>();
images.add("/storage/emulated/0/imageOne.png");//path of image in storage
images.add("/storage/emulated/0/imageTwo.png");
// images.add("/storage/emulated/0/imageThree");
// ... //add more images
String pathSaveCombinedImage = "/storage/emulated/0/CombinedImage.png";//path save result image
new PhotoComposition().execute(images, pathSaveCombinedImage);
And the result of using the above code will be as follows
使用上述代码的结果如下
回答by Daniel Nyamasyo
Try this .
尝试这个 。
public Bitmap mergeBitmap(Bitmap frame, Bitmap img){
Bitmap bmOverlay = Bitmap.createBitmap(frame.getWidth(), frame.getHeight(), frame.getConfig());
Canvas canvas = new Canvas(bmOverlay);
canvas.drawBitmap(img, 0, 0, null);
canvas.drawBitmap(frame, new Matrix(), null);
return bmOverlay;
}
Returns a bitmap image
返回位图图像
Pass two bitmap images to your function as shown below
将两个位图图像传递给您的函数，如下所示
Bitmap img= mergeBitmap(imgone, imagetwo);
See the entire postor also see merge multiple imagesin android programmatically
回答by Steve Pomeroy
回答by Brad Hein
If they have transparent sections, then if you draw one on top of the other, only the non-transparent portions will overlap. It will be up to you to arrange the bitmaps however you like.
如果它们有透明部分，那么如果您在另一个之上绘制一个部分，则只有非透明部分会重叠。您可以根据自己的喜好安排位图。
For the separate issue of re-saving your image to a png, use bitmap.compress().
对于将图像重新保存为 png 的单独问题，请使用 bitmap.compress()。
