Android巧用DecorView实现对话框功能

如果还不知道decorview，那也没有什么关系 ^_^

先来看看实现的效果

实现的大致思路

1. 首先需要明白什么是decorview，他是android中界面的根布局。其实android的activity界面整个就是一个控件树，decorview是根节点，decorview的孩子节点就是一个linearlayout，这个linearlayout的孩子系节点就包括状态栏 + 和我们自己写的布局
2. decorview是framlayout的子类（可以从源码中看到）
3. 既然decorview是根节点，而且还是framelayout，所以我们可以把我们自己的布局 添加到decorview 或者 从decorview移除，这样就模拟出了一个dialog的效果~~ ，当然这个dialog的样式，动画就可以自己想怎么写就怎么写了撒
4. 通过activity.getwindow().getdecorview()可以获得decorview

[下面大量 代码 ]

第一个对话框的实现

public class tipsdialog {
  private activity activity;
  private view rootview;
  private textview confirmtextview;
  private textview canceltextview;
  private textview contenttextview;

  private boolean isshowing;

  public tipsdialog(activity activity) {
    this.activity = activity;
    isshowing = false;
    rootview = layoutinflater.from(activity).inflate(r.layout.view_tips_dialog,null);
    confirmtextview = (textview) rootview.findviewbyid(r.id.view_tips_dialog_tv_confirm);
    canceltextview = (textview) rootview.findviewbyid(r.id.view_tips_dialog_tv_cancel);
    contenttextview = (textview) rootview.findviewbyid(r.id.view_tips_dialog_tv_content);

  }

  public void show(){
    if(activity == null){
      return;
    }
    if(isshowing){
      return;
    }
    viewgroup decorview = (viewgroup) activity.getwindow().getdecorview();
    framelayout.layoutparams params = new framelayout.layoutparams(viewgroup.layoutparams.match_parent, viewgroup.layoutparams.match_parent);
    params.gravity = gravity.center;
    rootview.setlayoutparams(params);
    decorview.addview(rootview);
    rootview.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        dismiss();
      }
    });

    rotateanimation rotateanimation = new rotateanimation(0,720f,rotateanimation.relative_to_self,0.5f,rotateanimation.relative_to_self,0.5f);
    rotateanimation.setduration(2000);
    contenttextview.startanimation(rotateanimation);

    isshowing = true;
  }

  public void dismiss(){
    if(!isshowing){
      return;
    }
    isshowing = false;
    if(rootview.getparent() == null){
      return;
    }
    viewgroup parent = (viewgroup) rootview.getparent();
    parent.removeview(rootview);

  }

  public int getrandomcolor(){
    random random = new random();
    return color.argb(random.nextint(200),random.nextint(240),random.nextint(240),random.nextint(240));
  }

  public boolean isshowing() {
    return isshowing;
  }
}

其实就是show的时候将布局添加到decorview上面去，dismiss的时候将布局从decorview上面移除

提示的实现（没有处理完善~~ 仅仅就是说明哈decorview）

public class toptipdialog {
  private activity activity;
  private view rootview;
  private boolean isshowing;
  private static final int view_height = 64;//px

  public toptipdialog(activity activity) {
    this.activity = activity;
    rootview = layoutinflater.from(activity).inflate(r.layout.view_top_tip_dialog,null);
  }


  public void show(){

    if(isshowing){
      return;
    }
    viewgroup decorview = (viewgroup) activity.getwindow().getdecorview();
    framelayout.layoutparams params = new framelayout.layoutparams(viewgroup.layoutparams.match_parent, view_height);
    params.gravity = gravity.top;
    params.setmargins(0,0,0,-view_height);
    rootview.setlayoutparams(params);

    translateanimation translateanimation = new translateanimation(0,0,-view_height,0);
    translateanimation.setduration(1500);
    translateanimation.setfillafter(true);
    decorview.addview(rootview);
    rootview.startanimation(translateanimation);

    rootview.postdelayed(new runnable() {
      @override
      public void run() {
        translateanimation translateanimation1 = new translateanimation(0,0,0,-view_height);
        translateanimation1.setduration(1500);
        translateanimation1.setfillafter(true);
        rootview.startanimation(translateanimation1);
      }
    },3000);

  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。