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I’m stuck with a problem that seems very easy.. I’ve seen lot of threads concerning my problem, but none of them helped me. It’s about getting Shared Prefferences..
The thing is I want to get result from calculations in doInBackground method, but I just don’t know how to use method getSharedPreferences.
I have my main activity called MainActivity. I also created new Java Class that should do something in the background. Here’s the code:
package com.example.pablo.zad3;
import android.content.SharedPreferences;
import android.os.AsyncTask;
public class Background extends AsyncTask<Integer,Void,String>{
@Override
protected String doInBackground(Integer... params) {
Integer n = params[0];
StringBuilder sb=new StringBuilder();
for(int i=1;i<250;i++)
{
sb.append(i+ " ");
sb.append(n*i+"n");
}
return sb.toString();
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
SharedPreferences prefs = //WHAT NOW??
}
}
Yet, there’s clearly something I don’t understand, cause I don’t know how to use it. Please provide me with some example code that would work in my case.
Answer
Your code needs to be modified like following:
package com.example.pablo.zad3;
import android.content.SharedPreferences;
import android.content.Context;
import android.os.AsyncTask;
public class Background extends AsyncTask<Integer,Void,String>{
private Context context;
public Background(Context context) {
this.context = context;
}
@Override
protected String doInBackground(Integer... params) {
Integer n = params[0];
StringBuilder sb=new StringBuilder();
for(int i=1;i<250;i++)
{
sb.append(i+ " ");
sb.append(n*i+"n");
}
return sb.toString();
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this.context);
}
}
Based on the questions you have asked (in main question along with those in comments), I guess you have never used SharedPreferences. Here is the link for your reference.
http://developer.android.com/reference/android/content/SharedPreferences.html
http://developer.android.com/training/basics/data-storage/shared-preferences.html
http://www.pcsalt.com/android/storing-data-in-sharedpreferences-android/