3状态切换按钮？

Question

要求是实现这样一个三路开关按钮..

[插入交换机无状态]

几乎无处不在我查过，只是有2状态开关按钮和我发现的唯一3路选项是切换。

任何人都已经使用/知道如何解决这种情况？

Answer 1

• 你必须限定延伸复选框

• 限定用于检查状态变量

• 覆盖所述的onClick或的oncheck方法来改变3个状态之间可变代替拨动器isChecked的类变量。

static private final int CHECKED = 1; 
 
private int state; 
 

 
public CheckBoxTriStates(Context context) { 
 
    super(context); 
 
    init(); 
 
} 
 

 
public CheckBoxTriStates(Context context, AttributeSet attrs) { 
 
    super(context, attrs); 
 
    init(); 
 
} 
 

 
public CheckBoxTriStates(Context context, AttributeSet attrs, int defStyleAttr) { 
 
    super(context, attrs, defStyleAttr); 
 
    init(); 
 
} 
 

 
private void init() 
 
{ 
 
    state = UNKNOW; 
 
    updateBtn(); 
 

 
    setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
 

 
     // checkbox status is changed from uncheck to checked. 
 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
 
     { 
 
      switch (state) 
 
      { 
 
       case UNKNOW: 
 
        state = UNCHECKED; 
 
        break; 
 
       case UNCHECKED: 
 
        state = CHECKED; 
 
        break; 
 
       case CHECKED: 
 
        state = UNKNOW; 
 
        break; 
 
      } 
 
      updateBtn(); 
 
     } 
 
    }); 
 

 
} 
 

 
private void updateBtn() 
 
{ 
 
    int btnDrawable = R.drawable.ic_checkbox_indeterminate_black; 
 
    switch (state) 
 
    { 
 
     case UNKNOW: 
 
      btnDrawable = R.drawable.ic_checkbox_indeterminate_black; 
 
      break; 
 
     case UNCHECKED: 
 
      btnDrawable = R.drawable.ic_checkbox_unchecked_black; 
 
      break; 
 
     case CHECKED: 
 
      btnDrawable = R.drawable.ic_checkbox_checked_black; 
 
      break; 
 
    } 
 
    setButtonDrawable(btnDrawable); 
 

 
} 
 
public int getState() 
 
{ 
 
    return state; 
 
} 
 

 
public void setState(int state) 
 
{ 
 
    this.state = state; 
 
    updateBtn(); 
 
} 
 

 
}