PopupWindow在android.widget包下，弹出窗口的形式展示。官方文档对该控件的描述是：“一个弹出窗口控件，可以用来显示任意视图(View)，而且会浮动在当前 活动(activity)的顶部”。PopupWindow可以让我们实现多种自定义控件，例如：menu、alertdialog等弹窗似的View。
一、PopupWindow的简单用法
在这个例子中，popupwindow在onCreate时初始化、通过触发事件展示出来。
java代码：public class ShowPopupWindow extends Activity implements View.OnClickListener {
View view;
PopupWindow pop;
Button btnShowAsDrawDown;
Button btnShowAsDrawDown1;
Button btnShowAtLocation;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.popup_activity);
btnShowAsDrawDown = (Button) findViewById(R.id.btnShowAsDrawDown);
btnShowAsDrawDown.setOnClickListener(this);
btnShowAsDrawDown1 = (Button) findViewById(R.id.btnShowAsDrawDown1);
btnShowAsDrawDown1.setOnClickListener(this);
btnShowAtLocation = (Button) findViewById(R.id.btnShowAt);
btnShowAtLocation.setOnClickListener(this);
initPopupWindow();
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.btnShowAsDrawDown:
if (pop.isShowing()){
pop.dismiss();
}
else{
pop.showAsDropDown(v);
}
break;
case R.id.btnShowAsDrawDown1:
if (pop.isShowing()){
pop.dismiss();
}
else{
pop.showAsDropDown(v, 0, -160);
}
break;
default:
if (pop.isShowing()){
pop.dismiss();
}
else{
pop.showAtLocation(findViewById(R.id.main),
Gravity.CENTER_HORIZONTAL, 0, 0);
}
break;
}
}
private void initPopupWindow(){
view = this.getLayoutInflater().inflate(R.layout.popup_window, null);
pop = new PopupWindow(view, ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
pop.setOutsideTouchable(true);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
pop.dismiss();
}
});
}
}
布局文件：popup_activity.xml<?xml version="1.0" encoding="utf-8"?>
android:orientation="vertical"
android:id="@+id/main"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="pop demo!"
/>
android:id="@+id/btnShowAsDrawDown"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Show as drawndown(one parameter)"
/>
android:id="@+id/btnShowAsDrawDown1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Show as drawndown(three parameters)"
/>
android:id="@+id/btnShowAt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Show At Location"
/>
布局文件：popup_window.xml<?xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="center_horizontal"
android:background="#d3d3d3">
android:id="@+id/btn_pop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Close"
android:layout_margin="10dip" />
二、一个能在自适应位置的PopupWindow
分享一个实例。看效果：
实现中使用的 PopupWindow。这里做了简单封装，其中有三个类组成：PopuItem、PopuJar、PopupWindows。public class PopuItem {
private Drawable icon;
private Bitmap thumb;
private String title;
private int actionId = -1;
private boolean selected;
private boolean sticky;
/**
* Constructor
*
* @param actionId Action id for case statements
* @param title Title
* @param icon Icon to use
*/
public PopuItem(int actionId, String title, Drawable icon) {
this.title = title;
this.icon = icon;
this.actionId = actionId;
}
/**
* Constructor
*/
public PopuItem() {
this(-1, null, null);
}
/**
* Constructor
*
* @param actionId Action id of the item
* @param title Text to show for the item
*/
public PopuItem(int actionId, String title) {
this(actionId, title, null);
}
/**
* Constructor
*
* @param icon [email protected] Drawable} action icon
*/
public PopuItem(Drawable icon) {
this(-1, null, icon);
}
/**
* Constructor
*
* @param actionId Action ID of item
* @param icon [email protected] Drawable} action icon
*/
public PopuItem(int actionId, Drawable icon) {
this(actionId, null, icon);
}
/**
* Set action title
*
* @param title action title
*/
public void setTitle(String title) {
this.title = title;
}
/**
* Get action title
*
* @return action title
*/
public String getTitle() {
return this.title;
}
/**
* Set action icon
*
* @param icon [email protected] Drawable} action icon
*/
public void setIcon(Drawable icon) {
this.icon = icon;
}
/**
* Get action icon
* @return [email protected] Drawable} action icon
*/
public Drawable getIcon() {
return this.icon;
}
/**
* Set action id
*
* @param actionId Action id for this action
*/
public void setActionId(int actionId) {
this.actionId = actionId;
}
/**
* @return Our action id
*/
public int getActionId() {
return actionId;
}
/**
* Set sticky status of button
*
* @param sticky true for sticky, pop up sends event but does not disappear
*/
public void setSticky(boolean sticky) {
this.sticky = sticky;
}
/**
* @return true if button is sticky, menu stays visible after press
*/
public boolean isSticky() {
return sticky;
}
/**
* Set selected flag;
*
* @param selected Flag to indicate the item is selected
*/
public void setSelected(boolean selected) {
this.selected = selected;
}
/**
* Check if item is selected
*
* @return true or false
*/
public boolean isSelected() {
return this.selected;
}
/**
* Set thumb
*
* @param thumb Thumb image
*/
public void setThumb(Bitmap thumb) {
this.thumb = thumb;
}
/**
* Get thumb image
*
* @return Thumb image
*/
public Bitmap getThumb() {
return this.thumb;
}
}
public class PopuJar extends PopupWindows implements OnDismissListener {
private View mRootView;
private ImageView mArrowUp;
private ImageView mArrowDown;
private LayoutInflater mInflater;
private ViewGroup mTrack;
private ScrollView mScroller;
private OnPopuItemClickListener mItemClickListener;
private OnDismissListener mDismissListener;
private List PopuItems = new ArrayList();
private boolean mDidAction;
private int mChildPos;
private int mInsertPos;
private int mAnimStyle;
private int mOrientation;
private int rootWidth=0;
public static final int HORIZONTAL = 0;
public static final int VERTICAL = 1;
public static final int ANIM_GROW_FROM_LEFT = 1;
public static final int ANIM_GROW_FROM_RIGHT = 2;
public static final int ANIM_GROW_FROM_CENTER = 3;
public static final int ANIM_REFLECT = 4;
public static final int ANIM_AUTO = 5;
/**
* Constructor for default vertical layout
*
* @param context Context
*/
public PopuJar(Context context) {
this(context, VERTICAL);
}
/**
* Constructor allowing orientation override
*
* @param context Context
* @param orientation Layout orientation, can be vartical or horizontal
*/
public PopuJar(Context context, int orientation) {
super(context);
mOrientation = orientation;
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (mOrientation == HORIZONTAL) {
setRootViewId(R.layout.popup_horizontal);
} else {
setRootViewId(R.layout.popup_vertical);
}
mAnimStyle = ANIM_AUTO;
mChildPos = 0;
}
/**
* Get action item at an index
*
* @param index Index of item (position from callback)
*
* @return Action Item at the position
*/
public PopuItem getPopuItem(int index) {
return PopuItems.get(index);
}
/**
* Set root view.
*
* @param id Layout resource id
*/
public void setRootViewId(int id) {
mRootView = (ViewGroup) mInflater.inflate(id, null);
mTrack = (ViewGroup) mRootView.findViewById(R.id.tracks);
mArrowDown = (ImageView) mRootView.findViewById(R.id.arrow_down);
mArrowUp = (ImageView) mRootView.findViewById(R.id.arrow_up);
mScroller = (ScrollView) mRootView.findViewById(R.id.scroller);
//This was previously defined on show() method, moved here to prevent force close that occured
//when tapping fastly on a view to show quickaction dialog.
//Thanx to zammbi (github.com/zammbi)
mRootView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
setContentView(mRootView);
}
/**
* Set animation style
*
* @param mAnimStyle animation style, default is set to ANIM_AUTO
*/
public void setAnimStyle(int mAnimStyle) {
this.mAnimStyle = mAnimStyle;
}
/**
* Set listener for action item clicked.
*
* @param listener Listener
*/
public void setOnPopuItemClickListener(OnPopuItemClickListener listener) {
mItemClickListener = listener;
}
/**
* Add action item
*
* @param action [email protected] PopuItem}
*/
public void addPopuItem(PopuItem action) {
PopuItems.add(action);
String title = action.getTitle();
Drawable icon = action.getIcon();
View container;
if (mOrientation == HORIZONTAL) {
container = mInflater.inflate(R.layout.action_item_horizontal, null);
} else {
container = mInflater.inflate(R.layout.action_item_vertical, null);
}
ImageView img = (ImageView) container.findViewById(R.id.iv_icon);
TextView text = (TextView) container.findViewById(R.id.tv_title);
if (icon != null) {
img.setImageDrawable(icon);
} else {
img.setVisibility(View.GONE);
}
if (title != null) {
text.setText(title);
} else {
text.setVisibility(View.GONE);
}
final int pos = mChildPos;
final int actionId = action.getActionId();
container.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (mItemClickListener != null) {
mItemClickListener.onItemClick(PopuJar.this, pos, actionId);
}
if (!getPopuItem(pos).isSticky()) {
mDidAction = true;
dismiss();
}
}
});
container.setFocusable(true);
container.setClickable(true);
if (mOrientation == HORIZONTAL && mChildPos != 0) {
View separator = mInflater.inflate(R.layout.horiz_separator, null);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT);
separator.setLayoutParams(params);
separator.setPadding(5, 0, 5, 0);
mTrack.addView(separator, mInsertPos);
mInsertPos++;
}
mTrack.addView(container, mInsertPos);
mChildPos++;
mInsertPos++;
}
/**
* Show quickaction popup. Popup is automatically positioned, on top or bottom of anchor view.
*
*/
public void show (View anchor) {
preShow();
int xPos, yPos, arrowPos;
mDidAction = false;
int[] location = new int[2];
anchor.getLocationOnScreen(location);
Rect anchorRect = new Rect(location[0], location[1], location[0] + anchor.getWidth(), location[1]
+ anchor.getHeight());
//mRootView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
mRootView.measure(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
int rootHeight = mRootView.getMeasuredHeight();
if (rootWidth == 0) {
rootWidth = mRootView.getMeasuredWidth();
}
int screenWidth = mWindowManager.getDefaultDisplay().getWidth();
int screenHeight = mWindowManager.getDefaultDisplay().getHeight();
//automatically get X coord of popup (top left)
if ((anchorRect.left + rootWidth) > screenWidth) {
xPos = anchorRect.left - (rootWidth-anchor.getWidth());
xPos = (xPos < 0) ? 0 : xPos;
arrowPos = anchorRect.centerX()-xPos;
} else {
if (anchor.getWidth() > rootWidth) {
xPos = anchorRect.centerX() - (rootWidth/2);
} else {
xPos = anchorRect.left;
}
arrowPos = anchorRect.centerX()-xPos;
}
int dyTop = anchorRect.top;
int dyBottom = screenHeight - anchorRect.bottom;
boolean onTop = (dyTop > dyBottom) ? true : false;
if (onTop) {
if (rootHeight > dyTop) {
yPos = 15;
LayoutParams l = mScroller.getLayoutParams();
l.height = dyTop - anchor.getHeight();
} else {
yPos = anchorRect.top - rootHeight;
}
} else {
yPos = anchorRect.bottom;
if (rootHeight > dyBottom) {
LayoutParams l = mScroller.getLayoutParams();
l.height = dyBottom;
}
}
showArrow(((onTop) ? R.id.arrow_down : R.id.arrow_up), arrowPos);
setAnimationStyle(screenWidth, anchorRect.centerX(), onTop);
mWindow.showAtLocation(anchor, Gravity.NO_GRAVITY, xPos, yPos);
}
/**
* Set animation style
*
* @param screenWidth screen width
* @param requestedX distance from left edge
* @param onTop flag to indicate where the popup should be displayed. Set TRUE if displayed on top of anchor view
* and vice versa
*/
private void setAnimationStyle(int screenWidth, int requestedX, boolean onTop) {
int arrowPos = requestedX - mArrowUp.getMeasuredWidth()/2;
switch (mAnimStyle) {
case ANIM_GROW_FROM_LEFT:
mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Left : R.style.Animations_PopDownMenu_Left);
break;
case ANIM_GROW_FROM_RIGHT:
mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Right : R.style.Animations_PopDownMenu_Right);
break;
case ANIM_GROW_FROM_CENTER:
mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Center : R.style.Animations_PopDownMenu_Center);
break;
case ANIM_REFLECT:
mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Reflect : R.style.Animations_PopDownMenu_Reflect);
break;
case ANIM_AUTO:
if (arrowPos <= screenWidth/4) {
mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Left : R.style.Animations_PopDownMenu_Left);
} else if (arrowPos > screenWidth/4 && arrowPos < 3 * (screenWidth/4)) {
mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Center : R.style.Animations_PopDownMenu_Center);
} else {
mWindow.setAnimationStyle((onTop) ? R.style.Animations_PopUpMenu_Right : R.style.Animations_PopDownMenu_Right);
}
break;
}
}
/**
* Show arrow
*
* @param whichArrow arrow type resource id
* @param requestedX distance from left screen
*/
private void showArrow(int whichArrow, int requestedX) {
final View showArrow = (whichArrow == R.id.arrow_up) ? mArrowUp : mArrowDown;
final View hideArrow = (whichArrow == R.id.arrow_up) ? mArrowDown : mArrowUp;
final int arrowWidth = mArrowUp.getMeasuredWidth();
showArrow.setVisibility(View.VISIBLE);
ViewGroup.MarginLayoutParams param = (ViewGroup.MarginLayoutParams)showArrow.getLayoutParams();
param.leftMargin = requestedX - arrowWidth / 2;
hideArrow.setVisibility(View.INVISIBLE);
}
/**
* Set listener for window dismissed. This listener will only be fired if the quicakction dialog is dismissed
* by clicking outside the dialog or clicking on sticky item.
*/
public void setOnDismissListener(PopuJar.OnDismissListener listener) {
setOnDismissListener(this);
mDismissListener = listener;
}
@Override
public void onDismiss() {
if (!mDidAction && mDismissListener != null) {
mDismissListener.onDismiss();
}
}
/**
* Listener for item click
*
*/
public interface OnPopuItemClickListener {
public abstract void onItemClick(PopuJar source, int pos, int actionId);
}
/**
* Listener for window dismiss
*
*/
public interface OnDismissListener {
public abstract void onDismiss();
}
}public class PopupWindows {
protected Context mContext;
protected PopupWindow mWindow;
protected View mRootView;
protected Drawable mBackground = null;
protected WindowManager mWindowManager;
/**
* Constructor.
*
* @param context Context
*/
public PopupWindows(Context context) {
mContext = context;
mWindow = new PopupWindow(context);
mWindow.setTouchInterceptor(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
mWindow.dismiss();
return true;
}
return false;
}
});
mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
}
/**
* On dismiss
*/
protected void onDismiss() {
}
/**
* On show
*/
protected void onShow() {
}
/**
* On pre show
*/
protected void preShow() {
if (mRootView == null)
throw new IllegalStateException("setContentView was not called with a view to display.");
onShow();
if (mBackground == null)
mWindow.setBackgroundDrawable(new BitmapDrawable());
else
mWindow.setBackgroundDrawable(mBackground);
mWindow.setWidth(WindowManager.LayoutParams.WRAP_CONTENT);
mWindow.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);
mWindow.setTouchable(true);
mWindow.setFocusable(true);
mWindow.setOutsideTouchable(true);
mWindow.setContentView(mRootView);
}
/**
* Set background drawable.
*
* @param background Background drawable
*/
public void setBackgroundDrawable(Drawable background) {
mBackground = background;
}
/**
* Set content view.
*
* @param root Root view
*/
public void setContentView(View root) {
mRootView = root;
mWindow.setContentView(root);
}
/**
* Set content view.
*
* @param layoutResID Resource id
*/
public void setContentView(int layoutResID) {
LayoutInflater inflator = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
setContentView(inflator.inflate(layoutResID, null));
}
/**
* Set listener on window dismissed.
*
* @param listener
*/
public void setOnDismissListener(PopupWindow.OnDismissListener listener) {
mWindow.setOnDismissListener(listener);
}
/**
* Dismiss the popup window.
*/
public void dismiss() {
mWindow.dismiss();
}
}
Popu调用时在onCreate使用如下：PopuItem userItem = new PopuItem(ID_USER, "用户", getResources().getDrawable(R.drawable.child_image));
PopuItem grounpItem = new PopuItem(ID_GROUNP, "群组", getResources().getDrawable(R.drawable.user_group));
//use setSticky(true) to disable PopuJar dialog being dismissed after an item is clicked
userItem.setSticky(true);
//create PopuJar. Use PopuJar.VERTICAL or PopuJar.HORIZONTAL param to define layout
final PopuJar mPopu = new PopuJar(this, PopuJar.VERTICAL);
//add action items into PopuJar
mPopu.addPopuItem(userItem);
mPopu.addPopuItem(grounpItem);
显示popu：mPopu.show(v); //v表示显示在那个view下面
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