Question

我的网址是JsonObectRequest的响应。我想要做的是将这些图像直接保存到我的外部存储器上的文件夹中，这样我就不必再从互联网上加载它们了。请注意，下载可能还包括视频......

//这是检索网址的排球码

private static final String endpoint = "http://api.androidhive.info/json/glide.json";

//提取图片网址的代码

JsonArrayRequest req = new JsonArrayRequest(endpoint,
            new Response.Listener<JSONArray>() {
                @Override
                public void onResponse(JSONArray response) {
                    Log.d(TAG, response.toString());
                    pDialog.hide();

                    images.clear();
                    for (int i = 0; i < response.length(); i++) {
                        try {
                            JSONObject object = response.getJSONObject(i);
                            Image image = new Image();
                            image.setName(object.getString("name"));

                            JSONObject url = object.getJSONObject("url");
                            image.setSmall(url.getString("small"));
                            image.setMedium(url.getString("medium"));
                            image.setLarge(url.getString("large"));
                            image.setTimestamp(object.getString("timestamp"));

                        } catch (JSONException e) {
                            Log.e(TAG, "Json parsing error: " + e.getMessage());
                        }
                    }

                    mAdapter.notifyDataSetChanged();
                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.e(TAG, "Error: " + error.getMessage());
            pDialog.hide();
        }
    });

现在，我如何请求下载，以便使用齐射将文件保存在我的外部。谢谢

Answer 1

 public boolean storeImages(Bitmap imageBitmap, String fileName, String dirName, int index) {
    File file;
    if (isExternalStorageWritable() && isExternalStorageReadable()) {
        file = storeImageExternalMemory(dirName, albumName, String.valueOf(index));
    }
    try {
        assert file != null;
        FileOutputStream out = new FileOutputStream(file);
        imageBitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
        out.flush();
        out.close();
        updateImageTable(file, index);  // Implement Your own method to update ur DB table, U can access file location from DB table for future use of images
        return true;
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
}

将下载的图像转换为位图，并将其保存到手机中的所需位置。然后你可以重复使用图像。

     private File storeImageExternalMemory(String dirName, String mediaName) {
    String packageName = mContext.getPackageName();
    File mediaStorageDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath()
            + "/Android/data/" + packageName + dirName);

    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            return null;
        }
    }
    File mediaFile;
    mediaFile = new File(mediaStorageDir.getPath(), mediaName + ".jpeg");
    return mediaFile;
}

/* Checks if external storage is available for read and write */
public boolean isExternalStorageWritable() {
    String state = Environment.getExternalStorageState();
    return Environment.MEDIA_MOUNTED.equals(state);
}

/* Checks if external storage is available to at least read */
public boolean isExternalStorageReadable() {
    String state = Environment.getExternalStorageState();
    return Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state);
}

使用Volley将图像/视频下载到外部存储（Android）

1 个答案: