android popupwindow用法详解

概述android popupwindow用法详解 本文实例为大家分享了android popupwindow的用法,供大家参考,具体内容如下 一.基本用法 一般做法,新建类继承popupwindow.例 /** * popupwindow基本用法 * Created by Administrator on 2015/11/25. */ public class DemoBasePop extends PopupWindow { private LinearLayout linear_layout; private TextView dbp_te

本文实例为大家分享了androID popupwindow的用法，供大家参考，具体内容如下

一、基本用法

一般做法，新建类继承popupwindow。例

/** * popupwindow基本用法 * Created by administrator on 2015/11/25. */public class DemoBasePop extends PopupWindow {  private linearLayout linear_layout;  private TextVIEw dbp_text;  private Context context;  public DemoBasePop(final Activity context) {    super(context);    this.context = context;    VIEw vIEw = LayoutInflater.from(context).inflate(R.layout.demo_base_pop,null);    setContentVIEw(vIEw);    setWIDth(VIEwGroup.LayoutParams.MATCH_PARENT);    setHeight(200);//    setHeight(VIEwGroup.LayoutParams.MATCH_PARENT);    setFocusable(true);    setBackgroundDrawable(new BitmapDrawable());    settouchable(true);    setoutsIDetouchable(true);    setAnimationStyle(R.style.popwin_anim_style);//    setAnimationStyle(0);   0是没有animation    initVIEw(vIEw);  }  private voID initVIEw(VIEw vIEw) {    dbp_text = (TextVIEw) vIEw.findVIEwByID(R.ID.dbp_text);  }}

研究下popupwindow源码，以showAsDropDown来讲

public voID showAsDropDown(VIEw anchor,int xoff,int yoff) {    if (isShowing() || mContentVIEw == null) {      return;    }    registerForScrollChanged(anchor,xoff,yoff);    mIsShowing = true;    mIsDropdown = true;    WindowManager.LayoutParams p = createPopupLayout(anchor.getwindowToken());    preparePopup(p);    updateAboveAnchor(findDropDownposition(anchor,p,yoff));    if (mHeightmode < 0) p.height = mLastHeight = mHeightmode;    if (mWIDthMode < 0) p.wIDth = mLastWIDth = mWIDthMode;    p.windowAnimations = computeAnimationResource();    invokePopup(p);  }

第11行创建WindowManager.LayoutParams。第12行preparePopup（）中：

if (mBackground != null) {      final VIEwGroup.LayoutParams layoutParams = mContentVIEw.getLayoutParams();      int height = VIEwGroup.LayoutParams.MATCH_PARENT;      if (layoutParams != null &&          layoutParams.height == VIEwGroup.LayoutParams.WRAP_CONTENT) {        height = VIEwGroup.LayoutParams.WRAP_CONTENT;      }      // when a background is available,we embed the content vIEw      // within another vIEw that owns the background drawable      PopupVIEwContainer popupVIEwContainer = new PopupVIEwContainer(mContext);      PopupVIEwContainer.LayoutParams ListParams = new PopupVIEwContainer.LayoutParams(          VIEwGroup.LayoutParams.MATCH_PARENT,height      );      popupVIEwContainer.setBackgroundDrawable(mBackground);      popupVIEwContainer.addVIEw(mContentVIEw,ListParams);      mPopupVIEw = popupVIEwContainer;    } else {      mPopupVIEw = mContentVIEw;    }

如果做了setBackgroundDrawable(new BitmapDrawable());那么mBackground则不为空，则会用PopupVIEwContainer作为mPopupVIEw（即内容vIEw）。而PopupVIEwContainer的dispatchKeyEvent对返回键做了处理，按返回键后其中调用dismiss（）方法。其ontouchEvent对触摸事件做了处理，其源码：

public boolean ontouchEvent(MotionEvent event) {      final int x = (int) event.getX();      final int y = (int) event.getY();      <span >//点击外部隐藏</span>      if ((event.getAction() == MotionEvent.ACTION_DOWN)          && ((x < 0) || (x >= getWIDth()) || (y < 0) || (y >= getHeight()))) {        dismiss();        return true;      } else if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {        dismiss();        return true;      } else {        return super.ontouchEvent(event);      }    }

系统做了这些处理，随之而来一个问题，如果我们要监听物理返回键该怎么办。看了上面的过程，我们可以想到将

setBackgroundDrawable(null);然后通过设置vIEw的key监听，监听到后做相应的处理。vIEw.setonKeyListener(new VIEw.OnKeyListener() {      @OverrIDe      public boolean onKey(VIEw v,int keyCode,KeyEvent event) {        if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {          if (event.getAction() == KeyEvent.ACTION_DOWN              && event.getRepeatCount() == 0) {            outAnimator.start();            return true;          }        }        return false;      }    });

效果图：

@H_301_30@

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我们。

总结

以上是内存溢出为你收集整理的android popupwindow用法详解全部内容，希望文章能够帮你解决android popupwindow用法详解所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。