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>