android - 如何从 sdcard 中选择一个图像文件，然后如何将它发送到服务器？

Question

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//下面

在我的应用程序中，我有一个按钮从 SD 卡中选择图像，单击它后，我想浏览所有图像，然后用户将选择任何图像，之后所选图像文件将上传到服务器.

而且我还有一个按钮 from camera 单击它，首先我想拍摄快照，然后上传到服务器，请通过示例告诉我任何方式？

Answer 1

这是我用来查询手机的 MediaStore 并返回包含所有图像的游标对象的代码。之后您可以将它们上传到您的服务器，但我建议您在 AsyncTask 中处理这第一部分。

class LoadImagesFromSDCard extends AsyncTask<Object, LoadedImage, Object> {

   //Load images from SDCARD and display
    @Override
    protected Object doInBackground(Object... params) {
        //setProgressBarIndeterminateVisibility(true); 
        Bitmap bitmap = null;
        Bitmap newBitmap = null;
        Uri uri = null;            

        // Set up an array of the Thumbnail Image ID column we want
        String[] projection = {MediaStore.Images.Thumbnails._ID};
        // Create the cursor pointing to the SDCard
        Cursor cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
                projection, // Which columns to return
                null,       // Return all rows
                null,       
                null); 
        int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
        int size = cursor.getCount();
        // If size is 0, there are no images on the SD Card.
        if (size == 0) {
            //No Images available, post some message to the user
        }
        int imageID = 0;
        for (int i = 0; i < size; i++) {
            cursor.moveToPosition(i);
            imageID = cursor.getInt(columnIndex);
            uri = Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID);
            try {
                bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
                if (bitmap != null) {
                    newBitmap = Bitmap.createScaledBitmap(bitmap, 70, 70, true);
                    bitmap.recycle();
                    if (newBitmap != null) {
                        publishProgress(new LoadedImage(newBitmap));
                    }
                }
            } catch (IOException e) {
                //Error fetching image, try to recover
            }
        }
        cursor.close();
        return null;
    }