在android上渐变按钮颜色变化

我想逐渐改变按钮颜色,点击它之后.我的意思是,按钮必须具有,例如下一组颜色：默认情况下 – 深蓝色,然后是深蓝色,然后是蓝色,然后是浅蓝色,最后是最亮的蓝色.这只是一个例子,我真的想在循环中更改按钮颜色,就像在下一个代码中一样.但是,我无法理解,为什么它不显示中间色.它仅显示第一种颜色,最后一种颜色显示.

如何改善这个？

public class ActivityExample extends Activity {
private changeColorBtn;

@Override
protected void onCreate(Bundle savedInstanceStatE) {

    super.onCreate(savedInstanceStatE);
    setContentView(R.layout.activity_animations);

    changeColorBtn = (Button) findViewById(R.id.btn_change_color);

    changeColorBtn.setBACkgroundColor(Color.bLACK);
    changeColorBtn.setOnClickListener(new View.onClickListener() {

        @Override
        public void onClick(View v) {
            changeButtonColor(v);

        }
    });

}

private void changeButtonColor(View v) {
    // How many intermediate color will be,and delay in millisecond between them
    int count = 20,delay = 100;
    for (int i = 0; i < count; i++) {
        try {

            int color = ((ColorDrawablE) changeColorBtn.getBACkground())
                    .getColor();
            int blue = Color.blue(color),red = Color.red(color),green = Color.green(color);
            changeColorBtn.setBACkgroundColor(Color.rgb(red+10,green+5,blue+3));

            Thread.sleep(delay);
        } catch (InterruptedException inE) {
        }
    }

}

@Override
protected void onSaveInstanceState(Bundle outStatE) {
    super.onSaveInstanceState(outStatE);
}

@Override
public Boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main,menu);
    return true;
}

}

<?xml version="1.0" encoding="UTF-8"?>
<transition xmlns:android="http://scheR_734_11845@as.android.com/apk/res/android">
    <item android:drawable="@color/color1" />
    <item android:drawable="@color/color2" />
</transition>

<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <color name="color1">#990000</color>
    <color name="color2">#cc3311</color>
</resources>

int durationMillis = 2000;
TransitionDrawable transition = (TransitionDrawablE) changeColorBtn.getBACkground();
transition.startTransition(durationMillis);