CODEWITHSUNDEEP
javaandroid
fatmanming
fatmanming

Reputation: 185

Bundle losing values

I'm new to java. I'm trying to save variables from OnSaveInstanceState, to OnCreate when the screen rotates. I've logged the values saved into the savedInstanceState Bundle. When the screen rotates the Bundle values in OnCreate(Bundle savedInstanceState) show on the log as 0's, but show as the correct values in the log for OnSaveInstanceState.

My Activity Java is 

package com.hfad.stopwatch;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

public class StopwatchActivity extends Activity {

    private static final String TAG = StopwatchActivity.class.getSimpleName();
    private int seconds;
    private boolean running;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_stopwatch);
        if(savedInstanceState != null){
            Log.d(TAG, "onCreate() Restoring previous state");
            /* restore state */
            seconds = savedInstanceState.getInt("seconds");
            running = savedInstanceState.getBoolean("running");
            String tmpStr = String.valueOf(seconds);
            Log.d(TAG,tmpStr);
            Log.d(TAG, "onCreate() ending");
        } else {
            Log.d(TAG, "onCreate() No saved state available");
            /* initialize app */
        }
        runTimer();
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState){
        super.onSaveInstanceState(savedInstanceState);
        Log.d(TAG,"onSaveInstanceState() saving state");
        savedInstanceState.putInt("Seconds", seconds);
        savedInstanceState.putBoolean("running", running);
        String tmpStr = String.valueOf(savedInstanceState.getInt("Seconds"));
        Log.d(TAG,tmpStr);
        Log.d(TAG,"onSaveInstanceState() ending");
    }

    //Start the stopwatch running when the start button is clicked
    public void onClickStart(View view){
        running = true;
    }

    //Stop the stopwatch running when the stop button is clicked
    public void onClickStop(View view){
        running = false;
    }

    //Start the stopwatch running when the start button is clicked
    public void onClickReset(View view){
        running = false;
        seconds = 0;
    }

    private void runTimer(){
        final TextView timeView = (TextView)findViewById(R.id.time_view);
        final Handler handler = new Handler();
        handler.post(new Runnable(){
            @Override
            public void run(){
                int hours = seconds/3600;
                int minutes = (seconds%3600)/60;
                int secs = seconds%60;
                String time = String.format("%d:%02d:%02d",hours,minutes,secs);
                timeView.setText(time);
                if(running){
                    seconds++;
                }
                handler.postDelayed(this, 1000);
            }
        });
    }

}

This is the Log.

07-26 21:02:19.880 6124-6124/com.hfad.stopwatch D/StopwatchActivity: onSaveInstanceState() saving state

07-26 21:02:19.880 6124-6124/com.hfad.stopwatch D/StopwatchActivity: 11

07-26 21:02:19.880 6124-6124/com.hfad.stopwatch D/StopwatchActivity: onSaveInstanceState() ending

07-26 21:02:19.940 6124-6124/com.hfad.stopwatch D/StopwatchActivity: onCreate() Restoring previous state

07-26 21:02:19.940 6124-6124/com.hfad.stopwatch D/StopwatchActivity: 0

07-26 21:02:19.940 6124-6124/com.hfad.stopwatch D/StopwatchActivity: onCreate() ending

I'm following lessons in a book, but this does not work as explained, and I can't find a solution online.

Upvotes: 0

Views: 63

Answers (3)

headsvk
headsvk

Reputation: 2826

Bundle is case-sensitive. You are putting in "Seconds" and retrieving "seconds". Good practice is to define the keys as constants so you don't experience such a mistake.

Bundle - is key case sensitive?

Upvotes: 1

gsb
gsb

Reputation: 5640

You're using a wrong key to find the value. There is a capital S in your key. Keys in a Bundle are case sensitive.

A good practice here would be to declare the key string as a final static and use them to store and retrieve. E.g.

public static final String SECONDS_KEY = "seconds";
public static final String RUNNING_KEY = "running"

Upvotes: 3

Diego Malone
Diego Malone

Reputation: 1052

You should call super.onSaveInstanceState(savedInstanceState) after set the values you want to save.

You can see more in the documentations

Upvotes: 1

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