Question

是的，我可以将值从父类传递给asynctask，但我只是在摆弄AsyncTask，它无法读取共享首选项，它正在读取null ..是的我用谷歌搜索它并在另一个线程上找到它stackoverflow，将那些共享首选项放在onPreexecute中，我已经完成了......但没有用这是我的代码

 public class Destination extends Activity {

EditText destinationPoint;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_destination);
    destinationPoint=(EditText)findViewById(R.id.dest);
    Parse.initialize(this, "PyCnNKLWz4XAJAroDgLYy7GEi", "nDOBi74l8eGbGXQKBsteGLIkHKEnHkpAVMQ");

}

public void ridenow(View view){
    SharedPreferences sharedPreferences =getSharedPreferences("AutoRaja",Context.MODE_PRIVATE);
    SharedPreferences.Editor edit=sharedPreferences.edit();
    edit.putString("destination", destinationPoint.getText().toString());
    edit.commit();
    String name=sharedPreferences.getString("customerName", "jj");
    Log.d("name",name);
    String phoneNumber=sharedPreferences.getString("customerNumber", "900");
    Log.d("phone",phoneNumber);
    String pickup=sharedPreferences.getString("pick", null);
    Log.d("pickup",pickup);
    String destination=sharedPreferences.getString("destination", null);
    Log.d("destination",destination);
    // sending to parse
    ParseObject ob=new ParseObject("Customer");
    ob.put("Name",name);
    ob.put("phone", phoneNumber);
    ob.put("pickup", pickup);
    ob.put("destination", destination);
    ob.saveInBackground();
    Intent i=new Intent(this,Confirmation.class);
    AsyncTaskRunner asyncTaskRunner=new AsyncTaskRunner();
    asyncTaskRunner.execute();
    startActivity(i);
    finish();



}




@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.destination, menu);
    return true;
}


private class AsyncTaskRunner extends AsyncTask<Void,Void,Void>{

    String customername;
    String pickup;
    String destination;
    String message;
    @Override
     protected void onPreExecute() {
          super.onPreExecute();
          SharedPreferences sharedPreferences=getSharedPreferences("Autoraja",Context.MODE_PRIVATE);
         customername=sharedPreferences.getString("customerName", null);
         pickup=sharedPreferences.getString("pick", null);
        destination=sharedPreferences.getString("destination", null);
         message="hi "+customername+", you have successfully booked Auto from "+pickup+" to "+destination +"" ; 

       }

    @Override
    protected Void doInBackground(Void... params) {



        String authkey = "5rBdfU2BhE53008ff8";
        //Multiple mobiles numbers seperated by comma
        String mobiles = "9788506486";
        //Sender ID,While using route4 sender id should be 6 characters long.
        String senderId = "AutoRJ";
        //Your message to send, Add URL endcoding here.

        //define route
        String route="4";

        //Prepare Url
        URLConnection myURLConnection=null;
        URL myURL=null;
        BufferedReader reader=null;

        //encoding message 
        String encoded_message=URLEncoder.encode(message);

        //Send SMS API
        String mainUrl="https://control.msg91.com/sendhttp.php?";

        String url;
        //Prepare parameter string 
        StringBuilder sbPostData= new StringBuilder();  
        sbPostData.append("authkey="+authkey); 
        sbPostData.append("&mobiles="+mobiles);
        sbPostData.append("&message="+encoded_message);
        sbPostData.append("&route="+route);
        sbPostData.append("&sender="+senderId);

        //final string
        mainUrl += sbPostData.toString();
        try
        {
            //prepare connection
            myURL = new URL(mainUrl);
            myURLConnection = myURL.openConnection();
            myURLConnection.connect();
            reader= new BufferedReader(new InputStreamReader(myURLConnection.getInputStream()));
            //reading response 
            String response;
            while ((response = reader.readLine()) != null) 
            //print response 
            System.out.println(response);

            //finally close connection
            reader.close();
        } 
        catch (IOException e) 
        { 
            e.printStackTrace();
        } 

        return null;
        // TODO Auto-generated method stub

    }
}

}

编辑：我使用了错误的共享首选项名称，但是这个问题可能对那些无法从异步任务访问共享首选项的人有用，doInBackground方法

Answer 1

getSharedPreferences("Autoraja",Context.MODE_PRIVATE);

与

getSharedPreferences("AutoRaja",Context.MODE_PRIVATE);

找出差异：）

为什么异步任务无法读取共享首选项

1 个答案: