Android巧用DecorView实现对话框功能

2019-12-12 03:09:39

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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);  }}

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