本篇文章主要介绍了Android巧用DecorView实现对话框功能，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
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
- 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
- DecorView是FramLayout的子类（可以从源码中看到）
- 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
- 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Android巧用DecorView实现对话框功能的详细内容，更多请关注0133技术站其它相关文章！
