佈局程式碼

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="轉吧！蜻蜓隊長跑馬燈"
        android:id="@+id/mytext"/>
    <Button
        android:layout_width="100px"
        android:layout_height="50px"
        android:id="@+id/myButton"
        android:text="轉"
        android:layout_x="110px"
        android:layout_y="180px"/>
</AbsoluteLayout>
 

java程式碼

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.TextView;

public class MainActivity extends AppCompatActivity {
    private Button mButton;
    private TextView mText;
    private int[] mColors;
    private int colornum;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mButton=(Button)findViewById(R.id.myButton);
        mText=(TextView)findViewById(R.id.mytext);
        mColors=new int[]
                {
                        Color.BLACK,Color.RED,Color.BLUE,
                        Color.GREEN,Color.MAGENTA,Color.YELLOW
                };
        colornum=0;
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(colornum<mColors.length)
                {
                    mText.setTextColor(mColors[colornum]);
                    colornum++;
                }
                else colornum=0;
            }
        });
    }
}