SharedPreferences 不适用于 setTextSize

Question

Hello i want to implement different text sizes for my app i tried with sharedpreferences here's my code

Declaring SharedPreferences

final  SharedPreferences savedFields;

    savedFields = this.getSharedPreferences("stoixeiaios", 0);
    stoixeia.setText(savedFields.getString("stoixeiadieth", ""));
    stoixeia2.setText(savedFields.getString("stoixeiaonoma", ""));

    logos1.setTextSize(savedFields.getFloat("megethos1",12));
    logos2.setTextSize(savedFields.getFloat("megethos2",12));
    logos3.setTextSize(savedFields.getFloat("megethos3",12));
    logos4.setTextSize(savedFields.getFloat("megethos4",12));
    logos5.setTextSize(savedFields.getFloat("megethos5",12));
    logos6.setTextSize(savedFields.getFloat("megethos6",12));

The button which changes the text size and saves the value to sharedpreferences

**    button4.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                SharedPreferences.Editor preferencesEditor = savedFields.edit();
                logos1.setTextSize(TypedValue.COMPLEX_UNIT_PX,24));
                logos2.setTextSize(TypedValue.COMPLEX_UNIT_PX,24);
                logos3.setTextSize(TypedValue.COMPLEX_UNIT_PX,24);
                logos4.setTextSize(TypedValue.COMPLEX_UNIT_PX,24);
                logos5.setTextSize(TypedValue.COMPLEX_UNIT_PX,24);
                logos6.setTextSize(TypedValue.COMPLEX_UNIT_PX,24);


                preferencesEditor.putFloat("megethos1", logos1.getTextSize());
                preferencesEditor.putFloat("megethos2", logos2.getTextSize());
                preferencesEditor.putFloat("megethos3", logos3.getTextSize());
                preferencesEditor.putFloat("megethos4", logos4.getTextSize());
                preferencesEditor.putFloat("megethos5", logos5.getTextSize());
                preferencesEditor.putFloat("megethos6", logos6.getTextSize());

                preferencesEditor.commit();
            }
        });**

I don't know what i am doing wrong

Thank you for your time

Edit : I forgot to post the problem

The problem is that the saved values after the app terminates are ALWAYS wrong for example when i click the button to change the text size , the text size changes then i terminate the app reopen it and the text size is bigger than it's supposed to be

Answer 1

The problem is that you are setting the text size in pixels. What you need to do is to convert it into density pixels.

To do this you can use this method

public int pxToDp(float px) {
    return (int) (px / Resources.getSystem().getDisplayMetrics().density);
}

So when you set the text size you should call

float textSize = savedFields.getFloat("megethos1",12);
logos1.setTextSize(pxToDp(textSize));

for every TextView.