FrameLayout 布局

（一）

1.效果图：颜色一直在改变，实现霓虹灯的效果

2.activity_main.xml

<?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.app2.MainActivity">

    <TextView
        android:id="@+id/tv1"
        android:background="@color/colorPrimaryDark"
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:text="Hello1"
        android:layout_gravity="center"
        />
    <TextView
        android:id="@+id/tv2"
        android:background="@color/colorAccent"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:text="Hello2"
        android:gravity="center"
        android:layout_gravity="center"/>
    <TextView
        android:id="@+id/tv3"
        android:background="@color/color1"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:text="Hello3"
        android:layout_gravity="center"/>
    <TextView
        android:id="@+id/tv4"
        android:background="@color/color2"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:text="Hello4"
        android:layout_gravity="center"/>
</FrameLayout>

2.MianActivity.java

package com.example.app2;

import android.os.Handler;
import android.os.Message;
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[] names = {R.id.tv1,R.id.tv2,R.id.tv3,R.id.tv4};
    private int currecolor=0;
    private int[] colors = {R.color.color1,R.color.color2,R.color.colorAccent,R.color.colorPrimaryDark};
    private TextView[] textViews=new TextView[names.length];
    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            if (msg.what==0x123){
                for (int i=0;i<names.length;i++){
                    textViews[i].setBackgroundResource(colors[(i+currecolor)%names.length]);
                }
                currecolor++;

            }
            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++){
            textViews[i]=(TextView)findViewById(names[i]);
        }

        new Timer().schedule(new TimerTask() {
            @Override
            public void run() {
                handler.sendEmptyMessage(0x123);
            }
        },0,300);
    }
}

2.color.xml增加了自己想添加的颜色

<?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="color1">#8080</color>
    <color name="color2">#7908</color>
</resources>