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本文實例為大家分享了android popupwindow的用法，供大家參考，具體內容如下
一、基本用法
一般做法，新建類繼承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是沒有animation
initView(view);
}
private void initView(View view) {
dbp_text = (TextView) view.findViewById(R.id.dbp_text);
}
}
研究下popupwindow源碼，以showAsDropDown來講
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, xoff, yoff));
if (mHeightMode < 0) p.height = mLastHeight = mHeightMode;
if (mWidthMode < 0) p.width = mLastWidth = mWidthMode;
p.windowAnimations = computeAnimationResource();
invokePopup(p);
}
第11行創建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則不為空，則會用PopupViewContainer作為mPopupView（即內容view）。而PopupViewContainer的dispatchKeyEvent對返回鍵做了處理，按返回鍵后其中調用dismiss（）方法。其onTouchEvent對觸摸事件做了處理，其源碼：
public boolean onTouchEvent(MotionEvent event) {
final int x = (int) event.getX();
final int y = (int) event.getY();
<span >//點擊外部隱藏</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);
}
}
系統做了這些處理，隨之而來一個問題，如果我們要監聽物理返回鍵該怎么辦。看了上面的過程，我們可以想到將
setBackgroundDrawable(null);然后通過設置view的key監聽，監聽到后做相應的處理。
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;
}
});
效果圖：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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