从 WebView 保存图像
2022-09-01 14:47:48
我会尽量简短 - 所以我正在做这个应用程序,其中图像上传到自定义,绘制画布并保存它。现在我成功地执行了所有内容,直到保存它为止。我尝试了很多不同的方法,但没有一个有效。Webview
我使用以下位置保存未编辑的图像:Url
public void DownloadFromUrl(String fileName) { //this is the downloader method
try {
URL url = new URL(wv2.getUrl()); //you can write here any link
File file = new File(fileName);
Canvas canvas = new Canvas();
wv2.draw(canvas );
long startTime = System.currentTimeMillis();
Log.d("ImageManager", "download begining");
Log.d("ImageManager", "download url:" + url);
Log.d("ImageManager", "downloaded file name:" + fileName);
URLConnection ucon = url.openConnection();
InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayBuffer baf = new ByteArrayBuffer(50);
int current = 0;
while ((current = bis.read()) != -1) {
baf.append((byte) current);
}
FileOutputStream fos = new FileOutputStream(file);
fos.write(baf.toByteArray());
fos.close();
Log.d("ImageManager", "download ready in"
+ ((System.currentTimeMillis() - startTime) / 1000)
+ " sec");
} catch (IOException e) {
Log.d("ImageManager", "Error: " + e);
}
}
我在自定义中的绘制函数如下所示:webview
@Override
protected void onDraw(Canvas canvas) {
super.onDraw (canvas);
/*code that draws different stuff*/
}
要显示编辑后的图像,我认为我需要使用这个:
canvas = new Canvas(mutableBitmap);
wv2.draw(canvas);
tstImage.setImageBitmap(mutableBitmap);
但同样,我不知道如何将画布合并到图像中。我应该使用图形缓存吗?如果是,那么如何?
[更新]
好的,所以我设法使用此代码保存了编辑后的图像
wv2.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(wv2.getDrawingCache());
wv2.setDrawingCacheEnabled(false);
tstImage.setImageBitmap(bitmap);
SaveImage(bitmap);
其中保存图像:
private void SaveImage(Bitmap finalBitmap) {
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/Pictures/");
myDir.mkdirs();
String fname = "Image-"+ count +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
我唯一的问题是,我得到的图像是当时在网络视图中显示的图像。因此,如果我缩放图像,它只会保存其中的一部分。
[更新 2]
我修改了其中一个答案以寻找解决方案,这就是我写的。未显示任何图像。
File imageFile = new File("file://" +
Environment.getExternalStorageDirectory() + "/Pictures/" + count + ".jpg");
String location = new String("file://" + Environment.getExternalStorageDirectory() + "/Pictures/" + count + ".jpg");
if(imageFile.exists()){
Bitmap myBitmap = BitmapFactory.decodeFile(location);
Bitmap mutableBitmap = myBitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(mutableBitmap);
wv2.draw(canvas);
tstImage.setImageBitmap(mutableBitmap);
}