Android中帧布局FrameLayout 霓虹灯效果 color数组报错问题

最新推荐文章于 2021-05-26 02:54:28 发布

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最新推荐文章于 2021-05-26 02:54:28 发布

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分类专栏： Android Android开发文章标签： Android 数组报错问题

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在实现Android帧布局FrameLayout的霓虹灯效果时，开发者遇到color数组报错的问题。尽管activity.xml布局文件无误，但MainActivity.java中的color数组在编译时出现红色错误提示。代码显示每行的color都标记为错误，问题原因尚未明确。

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《疯狂Android讲义》中用帧布局FrameLayout 来制造霓虹灯效果，布局文件activity.xml文件没有问题，但是在编写java程序的MainActivity.java文件的时候，写到color数组的时候，总是显示红色的错号，但是始终不知道如何的解决这些错号，这里先把MainActivity.java代码文件贴出来，如下所示

package com.example.framelayout;

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

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {

	private int currentColor=0;

        //定义一个颜色数组，编到这里的时候几乎每一行的color处都会显示红色的错号，百思不得其解？？？？？？？？？？？

        //按常理，既然用到了R.color.color1，则gen/R.java中应该有color这样的一个类，类中有color1到color6这些常量

         //但是始终找不到，这是为什么呢，想办法往R.java里边加color，没法加，因为这个文件本身就是自己自动生成的

               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.view01,
			R.id.view02,
			R.id.view03,
			R.id.view04,
			R.id.view05,
			R.id.view06		
	};
	
	TextView[] views = new TextView[names.length];
	Handler handler = new Handler(){
		public void handleMessage(Message msg){
			
			//表明消息来自本程序发送
			if(msg.what == 0x123){
				for(int i=0;i<names.length;i++){
					views[i].setBackgroundResource(colors[(i+currentColor)%names.length]);
				}
				currentColor++;
			}
			super.handleMessage(msg);
		}
	};

	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currentcolor变量值
		new Timer().schedule(new TimerTask(){
		  public void run(){
			handler.sendEmptyMessage(0x123);
		  }
    	},0,200);
     }

}

定义一个颜色数组，编到这里的时候几乎每一行的color处都会显示红色的错号，百思不得其解？？？？？？？？？？？

按照常理来讲，既然用到了R.color.color1，则在gen/R.java文件当中，必定会有color这样的一个类，类中有color1到color6这些常量但是始终找不到，这是为什么呢，想办法往R.java里边加color，没法加，因为这个文件本身就是自己自动生成的。那就想办法在其他的地方造一个关于color的文件，该文件中有上述java程序中的数组中所对应的6中颜色，于是就在res/values目录下加入一个color.xml文件，文件的内容如下：

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <color name="color1">#f00</color>
   <color name="color2">#0f0</color>
   <color name="color3">#00f</color>
   <color name="color4">#ff0</color>
   <color name="color5">#f0f</color>
   <color name="color6">#0ff</color>
</resources>

<span style="font-size:18px;color:#ff0000;"><strong>布局文件activity.xml中的程序如下</strong></span>

<pre class="java" name="code"><?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

    <!-- 依次定义6个TextView，先定义的TextView位于底层，后定义的TextView位于上层 -->
    <TextView
        android:id="@+id/view01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="320px"
        android:height="320px"
        android:background="#f00"
     />
    
    <TextView
        android:id="@+id/view02"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="280px"
        android:height="280px"
        android:background="#0f0"
     />
    
    <TextView
        android:id="@+id/view03"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="240px"
        android:height="240px"
        android:background="#00f"
     />
    
    <TextView
        android:id="@+id/view04"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="200px"
        android:height="200px"
        android:background="#ff0"
     />
    
    <TextView
        android:id="@+id/view05"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="160px"
        android:height="160px"
        android:background="#f0f"
     />
    
    <TextView
        android:id="@+id/view06"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:width="120px"
        android:height="120px"
        android:background="#0ff"
     />

</FrameLayout>

<strong><span style="font-size:18px;color:#ff0000;">完事之后，再去看gen/R.java程序，可以看到，里边出现了color类，类中有6个不同的颜色变量，具体的R.java代码如下：</span></strong>

<pre class="java" name="code">/* AUTO-GENERATED FILE.  DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found.  It
 * should not be modified by hand.
 */

package com.example.framelayout;

public final class R {
    public static final class attr {
    }
    public static final class color {
        public static final int color1=0x7f040000;
        public static final int color2=0x7f040001;
        public static final int color3=0x7f040002;
        public static final int color4=0x7f040003;
        public static final int color5=0x7f040004;
        public static final int color6=0x7f040005;
    }
    public static final class drawable {
        public static final int ic_launcher=0x7f020000;
    }
    public static final class id {
        public static final int menu_settings=0x7f080006;
        public static final int view01=0x7f080000;
        public static final int view02=0x7f080001;
        public static final int view03=0x7f080002;
        public static final int view04=0x7f080003;
        public static final int view05=0x7f080004;
        public static final int view06=0x7f080005;
    }
    public static final class layout {
        public static final int activity_main=0x7f030000;
    }
    public static final class menu {
        public static final int activity_main=0x7f070000;
    }
    public static final class string {
        public static final int app_name=0x7f050000;
        public static final int hello_world=0x7f050001;
        public static final int menu_settings=0x7f050002;
    }
    public static final class style {
        /** 
        Base application theme, dependent on API level. This theme is replaced
        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
    

            Theme customizations available in newer API levels can go in
            res/values-vXX/styles.xml, while customizations related to
            backward-compatibility can go here.
        

        Base application theme for API 11+. This theme completely replaces
        AppBaseTheme from res/values/styles.xml on API 11+ devices.
    
 API 11 theme customizations can go here. 

        Base application theme for API 14+. This theme completely replaces
        AppBaseTheme from BOTH res/values/styles.xml and
        res/values-v11/styles.xml on API 14+ devices.
    
 API 14 theme customizations can go here. 
         */
        public static final int AppBaseTheme=0x7f060000;
        /**  Application theme. 
 All customizations that are NOT specific to a particular API-level can go here. 
         */
        public static final int AppTheme=0x7f060001;
    }
}