android DatePicker 隐藏头部

android5.0及以上的版本中,DatePicker 在 calendar 模式下,自带了一个快速切换年份和日期的头部:


android DatePicker 隐藏头部_第1张图片
带头部的DatePicker

隐藏这个头部的原理就是找到相应的 View 并设置 Visibility 为 Gone.
在 DatePicker 源码中,如果 mode 使用的是 Calendar 则会调用 createCalendarUIDelegate 方法。

switch (mode) {    
    case MODE_CALENDAR:        
        mDelegate = createCalendarUIDelegate(context, attrs, defStyleAttr, defStyleRes);        
        break;    
    case MODE_SPINNER:    
    default:        
        mDelegate = createSpinnerUIDelegate(context, attrs, defStyleAttr, defStyleRes);        
        break;
}

createCalendarUIDelegate 则会返回一个 DatePickerSpinnerDelegate

private DatePickerDelegate createCalendarUIDelegate(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {    
    return new DatePickerCalendarDelegate(this, context, attrs, defStyleAttr, defStyleRes);
}

其中 DatePickerCalendarDelegate 使用的布局文件为 R.layout.date_picker_material

final int layoutResourceId = a.getResourceId(R.styleable.DatePicker_internalLayout, R.layout.date_picker_material);
// Set up and attach container.
mContainer = (ViewGroup) inflater.inflate(layoutResourceId, mDelegator, false);
mDelegator.addView(mContainer);

R.layout.date_picker_material 的内容为

    
        
    

第一个 include 的布局就是头部了,接下来要做的就是找到这个 View 然后隐藏掉。

ViewGroup rootView = (ViewGroup) datePicker.getChildAt(0);
if (rootView == null) {    
    return;
}
View headerView = rootView.getChildAt(0);
if (headerView == null) {    
    return;
}
headerView.setVisibility(View.GONE);

考虑到安全性,为了保证隐藏掉的 View 就是想要隐藏的头部,可以加上 id 的判断。

  • 5.0中,头部根布局的 id 为 day_picker_selector_layout
  • 6.0及以上,头部根布局的 id 为 date_picker_header

设置为 gone 之后还要动态的调整一下布局,所以最后的方法为:

private void hideDatePickerHeader(DatePicker datePicker) {    
    ViewGroup rootView = (ViewGroup) datePicker.getChildAt(0);    
    if (rootView == null) {        
        return;    
    }    
    View headerView = rootView .getChildAt(0);    
    if (headerView == null) {       
        return;    
    }    
    //5.0+   
    int headerId = context.getResources().getIdentifier("day_picker_selector_layout", "id", "android");    
    if (headerId == headerView.getId()) {        
        headerView.setVisibility(View.GONE);        
        
        ViewGroup.LayoutParams layoutParamsRoot = rootView.getLayoutParams();        
        layoutParamsRoot.width = ViewGroup.LayoutParams.WRAP_CONTENT;  
        rootView.setLayoutParams(layoutParamsRoot);        
        
        ViewGroup animator = (ViewGroup) rootView.getChildAt(1);        
        ViewGroup.LayoutParams layoutParamsAnimator = animator.getLayoutParams();        
        layoutParamsAnimator.width = ViewGroup.LayoutParams.WRAP_CONTENT;
        animator.setLayoutParams(layoutParamsAnimator);        

        View child = animator.getChildAt(0);        
        ViewGroup.LayoutParams layoutParamsChild = child.getLayoutParams();        
        layoutParamsChild.width = ViewGroup.LayoutParams.WRAP_CONTENT;        
        child.setLayoutParams(layoutParamsChild );       
        return;   
     }    
    //6.0+   
    headerId = context.getResources().getIdentifier("date_picker_header", "id", "android");    
    if (headerId == headerView.getId()) {        
        headerView.setVisibility(View.GONE);    
    }
}

最终效果:


android DatePicker 隐藏头部_第2张图片
隐藏头部的DatePicker

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