Android巧用DecorView實(shí)現(xiàn)對話框功能

更新時間：2017年04月08日 10:03:39 作者：大批

本篇文章主要介紹了Android巧用DecorView實(shí)現(xiàn)對話框功能，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

如果還不知道DecorView，那也沒有什么關(guān)系 ^_^

先來看看實(shí)現(xiàn)的效果

實(shí)現(xiàn)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。其實(shí)android的activity界面整個就是一個控件樹，DecorView是根節(jié)點(diǎn)，DecorView的孩子節(jié)點(diǎn)就是一個LinearLayout，這個LinearLayout的孩子系節(jié)點(diǎn)就包括狀態(tài)欄 + 和我們自己寫的布局
DecorView是FramLayout的子類（可以從源碼中看到）
既然DecorView是根節(jié)點(diǎn)，而且還是FrameLayout，所以我們可以把我們自己的布局添加到DecorView 或者從DecorView移除，這樣就模擬出了一個Dialog的效果~~ ，當(dāng)然這個Dialog的樣式，動畫就可以自己想怎么寫就怎么寫了撒
通過activity.getWindow().getDecorView()可以獲得DecorView

[下面大量代碼 ]

第一個對話框的實(shí)現(xiàn)

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;
  }
}

其實(shí)就是show的時候?qū)⒉季痔砑拥紻ecorView上面去，dismiss的時候?qū)⒉季謴腄ecorView上面移除

提示的實(shí)現(xiàn)（沒有處理完善~~ 僅僅就是說明哈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內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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