Starting With Android Studio Part-V || Adjust text size and color on button click

 

•     Hello friends welcome to Tech Punch.
  In this blog we will learn to adjust text size or color on button click
•          Create new project
•        Go to activity xml file
•      Drag and drop textView on canvas
•        Drag and drop three buttons on canvas
•         Give name to first button as Increment or  ‘+’.
•         Give name to second button as decrement or ‘-’.

 

•        Now go to java file
•         Write onclick method for ‘+’ button as increment
•         Inside that method get current size of text by using getTextSize() method.
•         As shown in code below.
•         After that increase text size using setTextSize() method.
•         Write same function for ‘– ‘as decrement
•         Inside that method do same this as we write in increment and instead of increasing size decrease the size.
•         For color method firstly declare three integer variables as ‘r’, ’g’, ’b’.
•         Set color to text by using setTextColor() method.
•         And increase the value of both ‘r’, ’g’, ’b’.

public class MainActivity extends AppCompatActivity {
    TextView t1;
    int r=0,g=0,b=0;
    float size;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        t1=findViewById(R.id.textView2);
    }
    public void increment(View v){
        size=t1.getTextSize();
        if(size<=150){
            t1.setTextSize(TypedValue.COMPLEX_UNIT_PX,size+4);
        }
    }
    public void decrement(View v){
        size=t1.getTextSize();
        if(size>=20){
            t1.setTextSize(TypedValue.COMPLEX_UNIT_PX,size-4);
        }

    }
    public void col(View v){
        t1.setTextColor(Color.rgb(r,g,b));
        r+=15;
        g+=30;
        b+=45;
    }

}