當(dāng)我在瀏覽器中打開該鏈接時，我正在使用該鏈接，它會生成一個 json.txt 文件并下載它。我想在 android 應(yīng)用程序中獲取這個 txt 文件，并想從這個 txt 文件中獲取 JSON 數(shù)據(jù)。
1 回答
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TA貢獻(xiàn)1853條經(jīng)驗(yàn) 獲得超9個贊
new DownloadFileFromURL().execute("your_file_downloadable_url");
class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Before starting background thread
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
System.out.println("Starting download");
}
/**
* Downloading file in background thread
* */
@Override
protected String doInBackground(String... f_url) {
int count;
try {
String root = Environment.getExternalStorageDirectory().toString();
System.out.println("Downloading");
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(), 8192);
// Output stream to write file
OutputStream output = new FileOutputStream(root+"/downloadedfile.txt");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
/**
* After completing background task
* **/
@Override
protected void onPostExecute(String file_url) {
System.out.println("Downloaded");
pDialog.dismiss();
}
}
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