学到一个android小应用-霓虹灯闪烁效果界面

package com.example.home.nihongdeng;

import android.os.Handler;
import android.os.Message;
import android.os.PersistableBundle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

private int currentColor=0;
//定义一个颜色组
final int[] colors=new int[]{
R.color.color1,
R.color.color2,
R.color.color3,
R.color.color4,
R.color.color5,
R.color.color6
};
final int[] names=new int[]{
R.id.tv0,
R.id.tv1,
R.id.tv2,
R.id.tv3,
R.id.tv4,
R.id.tv5
};
TextView[] views=new TextView[names.length];
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
//表明消息来自本程序所发送的
if (msg.what==0x123)
{
for (int i=0;i<names.length;i++)
{
views[i].setBackgroundResource(colors[(i+currentColor)%names.length]);
}
currentColor++;
}
super.handleMessage(msg);
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
for (int i=0;i<names.length;i++){
views[i]= (TextView) findViewById(names[i]);
}
//定义一个线程周期性的改变verrentColor的变量值
new Timer().schedule(new TimerTask() {
@Override
public void run() {
//发送一条空消息通知系统改变6个TextView的背景颜色
handler.sendEmptyMessage(0x123);
}
},0,200);//每0.2秒执行一次
}
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.home.nihongdeng.MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv0"
android:layout_gravity="center"
android:width="240pt"
android:height="240pt"
android:background="#f00"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv1"
android:layout_gravity="center"
android:width="200pt"
android:height="200pt"
android:background="#0f0"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv2"
android:layout_gravity="center"
android:width="160pt"
android:height="160pt"
android:background="#00f"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv3"
android:layout_gravity="center"
android:width="120pt"
android:height="120pt"
android:background="#ff0"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv4"
android:layout_gravity="center"
android:width="80pt"
android:height="80pt"
android:background="#f0f"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv5"
android:layout_gravity="center"
android:width="40pt"
android:height="40pt"
android:background="#0ff"/>
</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryDark">#303F9F</color>
<color name="colorAccent">#FF4081</color>
<color name="color6">#0ff</color>
<color name="color5">#f0f</color>
<color name="color4">#ff0</color>
<color name="color3">#00f</color>
<color name="color2">#0f0</color>
<color name="color1">#f00</color>
</resources>