学到一个android小应用-霓虹灯闪烁效果界面
16lz
2022-04-05
代码如下:使用的是帧布局
java 代码:
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文件代码:
<?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>
其中用到颜色资源,color.xml代码:
<?xml version="1.0" encoding="utf-8"?><resources> <color name="colorPrimary">#3F51B5color> <color name="colorPrimaryDark">#303F9Fcolor> <color name="colorAccent">#FF4081color> <color name="color6">#0ffcolor> <color name="color5">#f0fcolor> <color name="color4">#ff0color> <color name="color3">#00fcolor> <color name="color2">#0f0color> <color name="color1">#f00color>resources>
很好玩哦,刚开始学android ,蛮好玩的!!!
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