MainActivity.java

package com.example.nino.firstapp;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.util.Random;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.textView);
        final EditText edit = (EditText) findViewById(R.id.editText);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Random randomcolor = new Random();
                int color = Color.argb(255, randomcolor.nextInt(256), randomcolor.nextInt(256), randomcolor.nextInt(256));
                edit.setTextColor(color);


            }
        });
    }
}