Increasing And Decreasing The Font Sizes Of The Android Application By User Selection

Actually i want to specify the custom text size in my application by user selection. Below is a figure that demonstrate the idea/theme So, for that i have an idea to achieve this.

Solution 1:

you can check

btnTextDeSave.setOnClickListener(onClickEven);
btnTextInSave.setOnClickListener(onClickEven);

publicOnClickListeneronClickEven=newOnClickListener() {

    @OverridepublicvoidonClick(View v) {
        // TODO Auto-generated method stubswitch (v.getId()) {
            break;
        case R.id.btTextDeSave:
            txtDescriptionSave.setTextSize(TypedValue.COMPLEX_UNIT_PX, (txtDescriptionSave.getTextSize() - 2f));
            break;
        case R.id.btTextInSave:
            txtDescriptionSave.setTextSize(TypedValue.COMPLEX_UNIT_PX, (txtDescriptionSave.getTextSize() + 2f));
            break;

        default:
            break;
        }

    }
};

Solution 2:

To increase the size of your textView you can use

_percentField.setTextSize(values[0]*2);

where values is an array.

And to decrease you can try

 _percentField.setTextSize(values[0]/2);

Solution 3:

You can try this-

    textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, <font-size value in integer> );

    // to update your changes
    textView.invalidate();

Solution 4:

do it this way

float fs = prefs.getFloat("fontsize", 12);
seekbar.setProgress((int)fs);
layout.setTextSize(TypedValue.COMPLEX_UNIT_PX,seekbar.getProgress());

and don't forget onProgressChanged:

layout.setTextSize(TypedValue.COMPLEX_UNIT_PX,progress);

Solution 5:

You can do this simply by:

//Adjust values with whatever your need isintSIZE_LARGE=24; 
int SIZE_SMALL= 16;

btnLargeText.setOnClickListener(newOnClickListener() {
    
    @OverridepublicvoidonClick(View arg0) {
        textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, LARGE_SIZE);
    }
});

btnSmallText.setOnClickListener(newOnClickListener() {
    
    @OverridepublicvoidonClick(View arg0) {
        textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, SIZE_SMALL);
    }
});