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 }
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 }