自定义控件中如何实现按钮之间的共轭？

问题：布局如图

控件BottomLayout为下方的三个ImageButton

意图：将下方的三个按钮实现为时刻有且只有一个被选中（类似微博）

最简单的解决方法：

 1 package com.example.weibo;
 2 
 3 import android.content.Context;
 4 import android.util.AttributeSet;
 5 import android.view.LayoutInflater;
 6 import android.view.View;
 7 import android.widget.ImageButton;
 8 import android.widget.LinearLayout;
 9 
10 
11 public class BottomLayout extends LinearLayout {
12     private ImageButton main;
13     private ImageButton add;
14     private ImageButton account;
15     
16     final int home_b = R.drawable.ic_home_black_48dp;
17     final int home_g = R.drawable.ic_home_grey600_48dp;
18     final int add_b = R.drawable.ic_add_circle_black_48dp;
19     final int add_g = R.drawable.ic_add_circle_grey600_48dp;
20     final int account_b = R.drawable.ic_account_box_black_48dp;
21     final int account_g = R.drawable.ic_account_box_grey600_48dp;
22     
23     public BottomLayout(Context context,AttributeSet attrs){
24         super(context,attrs);
25         LayoutInflater.from(context).inflate(R.layout.bottom,this);
26         main = (ImageButton)findViewById(R.id.bottom_main);
27         add = (ImageButton)findViewById(R.id.bottom_add);
28         account = (ImageButton)findViewById(R.id.bottom_account);
29         main.setTag("g");
30         add.setTag("g");
31         account.setTag("g");
32     
33         
34         
35         
36         main.setOnClickListener(new OnClickListener(){
37             @Override
38             public void onClick(View v){
39                 if (v.getTag()=="g")
40                 {
41                     ((ImageButton)v).setImageResource(home_b);
42                     v.setTag("b");
43                     add.setImageResource(add_g);
44                     add.setTag("g");
45                     account.setImageResource(account_g);
46                     account.setTag("g");
47                 }
48             }
49         });
50         add.setOnClickListener(new OnClickListener(){
51             @Override
52             public void onClick(View v){
53                 if (v.getTag()=="g")
54                 {
55                     ((ImageButton)v).setImageResource(add_b);
56                     v.setTag("b");
57                     main.setImageResource(home_g);
58                     main.setTag("g");
59                     account.setImageResource(account_g);
60                     account.setTag("g");
61                 }
62             }
63         });
64         account.setOnClickListener(new OnClickListener(){
65             @Override
66             public void onClick(View v){
67                 if (v.getTag()=="g")
68                 {
69                     ((ImageButton)v).setImageResource(account_b);
70                     v.setTag("b");
71                     add.setImageResource(add_g);
72                     add.setTag("g");
73                     main.setImageResource(home_g);
74                     main.setTag("g");
75                 }
76             }
77         });
78     
79     }
80 }

View Code

结果如图：

不过好像没什么意思，明日看看有什么好的方案没有

 修改了一下实现方法，用flag标记，为什么就不能切换了……

错误代码：

  1 package com.example.weibo;
  2 
  3 import android.content.Context;
  4 import android.util.AttributeSet;
  5 import android.view.LayoutInflater;
  6 import android.view.View;
  7 import android.view.View.OnClickListener;
  8 import android.widget.ImageButton;
  9 import android.widget.LinearLayout;
 10 
 11 
 12 public class BottomLayout extends LinearLayout implements OnClickListener {
 13 //    private ImageButton main;
 14 //    private ImageButton add;
 15 //    private ImageButton account;
 16     
 17     private ImageButton ib[]=new ImageButton[3];
 18     int flag = 0;
 19     
 20     final int home_b = R.drawable.ic_home_black_48dp;
 21     final int home_g = R.drawable.ic_home_grey600_48dp;
 22     final int add_b = R.drawable.ic_add_circle_black_48dp;
 23     final int add_g = R.drawable.ic_add_circle_grey600_48dp;
 24     final int account_b = R.drawable.ic_account_box_black_48dp;
 25     final int account_g = R.drawable.ic_account_box_grey600_48dp;
 26     
 27     public BottomLayout(Context context,AttributeSet attrs){
 28         super(context,attrs);
 29         LayoutInflater.from(context).inflate(R.layout.bottom,this);
 30 /*        main = (ImageButton)findViewById(R.id.bottom_main);
 31         add = (ImageButton)findViewById(R.id.bottom_add);
 32         account = (ImageButton)findViewById(R.id.bottom_account);
 33         main.setTag("g");
 34         add.setTag("g");
 35         account.setTag("g");
 36         
 37         main.setOnClickListener(new OnClickListener(){
 38             @Override
 39             public void onClick(View v){
 40                 if (v.getTag()=="g")
 41                 {
 42                     ((ImageButton)v).setImageResource(home_b);
 43                     v.setTag("b");
 44                     add.setImageResource(add_g);
 45                     add.setTag("g");
 46                     account.setImageResource(account_g);
 47                     account.setTag("g");
 48                 }
 49             }
 50         });
 51         add.setOnClickListener(new OnClickListener(){
 52             @Override
 53             public void onClick(View v){
 54                 if (v.getTag()=="g")
 55                 {
 56                     ((ImageButton)v).setImageResource(add_b);
 57                     v.setTag("b");
 58                     main.setImageResource(home_g);
 59                     main.setTag("g");
 60                     account.setImageResource(account_g);
 61                     account.setTag("g");
 62                 }
 63             }
 64         });
 65         account.setOnClickListener(new OnClickListener(){
 66             @Override
 67             public void onClick(View v){
 68                 if (v.getTag()=="g")
 69                 {
 70                     ((ImageButton)v).setImageResource(account_b);
 71                     v.setTag("b");
 72                     add.setImageResource(add_g);
 73                     add.setTag("g");
 74                     main.setImageResource(home_g);
 75                     main.setTag("g");
 76                 }
 77             }
 78         });
 79 */    
 80         ib[0] = (ImageButton)findViewById(R.id.bottom_main);
 81         ib[1] = (ImageButton)findViewById(R.id.bottom_add);
 82         ib[2] = (ImageButton)findViewById(R.id.bottom_account);
 83     }
 84     @Override
 85     public void onClick(View v)
 86     {
 87         switch(v.getId()){
 88         case R.id.bottom_main:
 89             ((ImageButton)v).setImageResource(home_b);
 90             if (flag == 2) ib[1].setImageResource(add_g);
 91             else if (flag == 4) ib[2].setImageResource(account_g);
 92             else ;
 93             flag = 1;
 94             break;
 95         case R.id.bottom_add:
 96             ((ImageButton)v).setImageResource(add_b);
 97             if (flag == 1) ib[0].setImageResource(home_g);
 98             else if (flag == 4) ib[2].setImageResource(account_g);
 99             else ;
100             flag = 2;
101             break;
102         case R.id.bottom_account:
103             ((ImageButton)v).setImageResource(account_b);
104             if (flag == 1) ib[0].setImageResource(home_g);
105             else if (flag == 4) ib[2].setImageResource(account_g);
106             else ;
107             flag = 4;
108             break;
109         default: ;
110         }
111     }
112 }

Wrong Code