我如何保存从URL的形象？(How can I save an image from a url?)

我设置使用的ImageView setImageBitmap与外部图像的URL。 我想保存图像，以便它可以在以后即使没有互联网连接使用。 在哪里以及如何保存呢？

Answer 1:

你必须将它保存在SD卡或在您的包数据，因为在运行时，你只能访问这些。 要做到这一点，这是一个很好的例子

URL url = new URL ("file://some/path/anImage.png");
InputStream input = url.openStream();
try {
//The sdcard directory e.g. '/sdcard' can be used directly, or 
//more safely abstracted with getExternalStorageDirectory()
File storagePath = Environment.getExternalStorageDirectory();
OutputStream output = new FileOutputStream (storagePath + "/myImage.png");
try {
    byte[] buffer = new byte[aReasonableSize];
    int bytesRead = 0;
    while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
        output.write(buffer, 0, bytesRead);
    }
} finally {
    output.close();
}
} finally {
input.close();
}

来源： 如何将图像从它的URL转移到SD卡？

Answer 2:

URL imageurl = new URL("http://mysite.com/me.jpg"); 
Bitmap bitmap = BitmapFactory.decodeStream(imageurl.openConnection().getInputStream()); 

此代码将帮助您从图像生成URL的位图。

这个问题回答的第二部分。

Answer 3:

你可以保存图像中的SD卡，你可以使用图像中的未来没有互联网。

请参阅本教程将介绍如何存储图像，然后再次读取。

希望对你有帮助.....！

Answer 4:

可能是它会帮助别人像我一天

 new SaveImage().execute(mViewPager.getCurrentItem());//calling function

private void saveImage(int currentItem) {
    String stringUrl = Site.BASE_URL + "socialengine/" + allImages.get(currentItem).getMaster();
    Utils.debugger(TAG, stringUrl);

    HttpURLConnection urlConnection = null;
    try {
        URL url = new URL(stringUrl);
        urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod("GET");
        urlConnection.setDoOutput(true);
        urlConnection.connect();
        File sdCardRoot = Environment.getExternalStorageDirectory().getAbsoluteFile();

        String fileName = stringUrl.substring(stringUrl.lastIndexOf('/') + 1, stringUrl.length());
        String fileNameWithoutExtn = fileName.substring(0, fileName.lastIndexOf('.'));

        File imgFile = new File(sdCardRoot, "IMG" + System.currentTimeMillis() / 100 + fileName);
        if (!sdCardRoot.exists()) {
            imgFile.createNewFile();
        }

        InputStream inputStream = urlConnection.getInputStream();
        int totalSize = urlConnection.getContentLength();
        FileOutputStream outPut = new FileOutputStream(imgFile);

        int downloadedSize = 0;
        byte[] buffer = new byte[2024];
        int bufferLength = 0;
        while ((bufferLength = inputStream.read(buffer)) > 0) {
            outPut.write(buffer, 0, bufferLength);
            downloadedSize += bufferLength;
            Utils.debugger("Progress:", "downloadedSize:" + Math.abs(downloadedSize*100/totalSize));
        }
        outPut.close();
        //if (downloadedSize == totalSize);
            //Toast.makeText(context, "Downloaded" + imgFile.getPath(), Toast.LENGTH_LONG).show();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

 private class SaveImage extends AsyncTask<Integer, Void, String> {

    @Override
    protected String doInBackground(Integer... strings) {
        saveImage(strings[0]);
        return "saved";
    }

    @Override
    protected void onPostExecute(String s) {
        Toast.makeText(context, "" + s, Toast.LENGTH_SHORT).show();
    }
}

文章来源: How can I save an image from a url?