无法显示吐司

Question

我的代码出了什么问题？每次运行代码时都会出现此错误。尝试下载.txt文件，然后在toast中显示文本。这就是我想要的！

                                                              : FATAL EXCEPTION: main    Process: nnsoft.nsomuhtest, PID: 18706
                                                                  java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
                                                                      at android.widget.Toast.<init>(Toast.java:138)
                                                                      at android.widget.Toast.makeText(Toast.java:385)

代码：

 @Override
    protected void onPostExecute(String unused) {
        StringBuilder text = new StringBuilder();
        try {
            BufferedReader br = new BufferedReader(new FileReader(AnnouncementsDirectory));
            String line;
            while ((line = br.readLine()) != null) {
                text.append(line);
                text.append('\n');
            }
            br.close();
            Toast.makeText(context, text, Toast.LENGTH_LONG).show();
        } catch (IOException e) {
            Toast.makeText(context, "error reading ver file", Toast.LENGTH_LONG).show();
        }
    }