当按下后退按钮或使用SharedPreferences和onCheckChangeListener退出应用程序时，保存选中的按钮状态

Question

I am trying to make an android app that allows users to block apps for a specific period of time. So I have a listview of installed apps in a fragment with a switch button next to it.

I want it to stay checked when the user checks its or unchecks it after they press back and exit the app.

I am trying to achieve this using setOnCheckedChangeListener and Shared Preferences; however; I am having trouble saving the button state in my BaseAdapter class.

    holder.ck1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            if (holder.ck1.isChecked()) {
                //itemChecked[position] = true;
                b = true;
                holder.ck1.setChecked(b);
                Log.i("This is", " checked: " + position);
                SharedPreferences.Editor editor = context.getSharedPreferences("com.ibc.android.demo.appslist.app", Context.MODE_PRIVATE).edit();
                editor.putBoolean("checkBox1", b);
                editor.commit();

            } else {
                //itemChecked[position] = false;
                b= false;
                holder.ck1.setChecked(b);
                Log.i("This is", " not checked: " + position);
                SharedPreferences.Editor editor = context.getSharedPreferences("com.ibc.android.demo.appslist.app", Context.MODE_PRIVATE).edit();
                editor.putBoolean("checkBox1", b);
                editor.commit();

            }
        }

    });
    sharedPrefs = context.getSharedPreferences("PACKAGE_NAME", Context.MODE_PRIVATE);
    holder.ck1.setChecked(sharedPrefs.getBoolean("checkBox1",false));

    // I think that maybe instead of false I should put the boolean b I defined in the method but I am not sure how to get it .


    return convertView;

}

How I do I modify this to reach to desired result?

Answer 1

I think whenever the activity created it automatically calls onCheckedChange and your SharedPreferences overwrite by default values. so I think you can use onStop to update the SharedPreferences.

Answer 2

holder.ck1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

    @Override
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) 
        { 
                SharedPreferences.Editor editor = context.getSharedPreferences("PACKAGE_NAME", Context.MODE_PRIVATE).edit();
                editor.putBoolean(pakagename, b);
                editor.commit();
        }

});

sharedPrefs = context.getSharedPreferences("PACKAGE_NAME", Context.MODE_PRIVATE);
holder.ck1.setChecked(sharedPrefs.getBoolean(pakagename,false));
return convertView;

}

pakagename holds the package name of that particular listitem. Otherwise if you are targeting above api level 11, you can use a set in sharedpreferences to store all the checked package names. This is the easy way. Otherwise you can save the list of checked applications in a database.

Answer 3

I have achieved the requested feature. Check my code:

final SharedPreferences sharedPreferences = getSharedPreferences("conditionCheck", MODE_PRIVATE); 
switchCompat.setChecked(sharedPreferences.getBoolean("switchCondition",false));        
switchCompat.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {            
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        final SharedPreferences sharedPreferences = getSharedPreferences("conditionCheck", MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        if (switchCompat.isChecked()) {
            Toast.makeText(getApplicationContext(), "Checked Condition True", Toast.LENGTH_LONG).show();
            editor.putBoolean("switchCondition",switchCompat.isChecked());
            editor.commit();    
        } else {
            Toast.makeText(getApplicationContext(), "Checked Condition False", Toast.LENGTH_LONG).show();
            editor.putBoolean("switchCondition",switchCompat.isChecked());
            editor.commit();
        }
    }
});