Android PopupMenu 与 PopupWindow(的区别)
平常的开发可能经常碰到PopupMenu和PopupWindow,但是不小心的话总是比较容易搞混淆了这两者,下面通过一个实例简单介绍下它们各自的使用方式。
实例的代码使用了Android Annotations,但是代码读起来应该是没有障碍的,如果不太了解AA的话,可以参考下此文。
1.PopupMenu和PopupWindow
PopupMenu显示效果类似上下文菜单(Menu),而PopupWindow的显示效果实际上类似对话框(Dialog),两者效果如下图所示:
PopupMenu显示效果
PopupWindow显示效果
2.实例基础代码
我们要实现的界面就是上面所示的界面,上下各有两个按钮,点击按钮分别在正确的位置弹出PopupMenu或者PopupWindow,下面是界面代码:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="hujiawei.xiaojian.ui.PopupwindowActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:orientation="vertical">
<Button
android:id="@+id/window"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="show popup window"/>
<Button
android:id="@+id/menu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/window"
android:text="show popup menu"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="vertical">
<Button
android:id="@+id/bottomwindow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="show popup window"/>
<Button
android:id="@+id/bottommenu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/window"
android:text="show popup menu"/>
</LinearLayout>
</RelativeLayout>
3.实现PopupMenu
PopupMenu的实现稍微简单点,因为它就是普通的菜单!
(1)在res/menu文件夹下新建文件menu_popupmenu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/item_movies"
android:title="Movies"
android:visible="true"
app:showAsAction="ifRoom|withText"/>
<item
android:id="@+id/item_music"
android:title="Music"
android:visible="true"
app:showAsAction="ifRoom|withText"/>
<item
android:id="@+id/item_photo"
android:title="Photo"
android:visible="true"
app:showAsAction="ifRoom|withText"/>
</menu>
(2)然后在Activity中创建Menu并处理MenuItem的点击事件
@Click({R.id.menu, R.id.bottommenu})
void menu(View view) {
PopupMenu popupMenu = new PopupMenu(this, view);
popupMenu.setOnMenuItemClickListener(this);
popupMenu.inflate(R.menu.menu_popupmenu);
popupMenu.show();
}
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.item_photo:
toastUtil.showShortToast("Photo");
return true;
case R.id.item_movies:
toastUtil.showShortToast("Movies");
return true;
case R.id.item_music:
toastUtil.showShortToast("Music");
return true;
}
return false;
}
从上面的代码可以看出,不论是点击上面的还是下面的show popup menu按钮,结果都是弹出在当前按钮附近显示PopupMenu (因为这里设置了button view为anchor view),而且它会自适应位置,在按钮的左下角或者左上角显示。
4.实现PopupWindow
实现PopupWindow稍微复杂些,但是自定义性更强,它可以将任意界面设置为PopupWindow。
(1)新建布局文件layout/window_popup.xml,作为PopupWindow,其中只有4个按钮,最后一个是取消按钮,用于关闭PopupWindow
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:layout_marginRight="@dimen/activity_horizontal_margin"
android:background="@android:color/background_dark"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:id="@+id/music"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Music"/>
<Button
android:id="@+id/movie"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Movie"/>
<Button
android:id="@+id/photo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Photo"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="vertical">
<Button
android:id="@+id/cancel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Cancel"/>
</LinearLayout>
</LinearLayout>
(2)在Activity中控制PopupWindow的显示和事件处理
@Click
void window(View view) {
if (popupWindow != null && popupWindow.isShowing()) {
return;
}
LinearLayout layout = (LinearLayout) getLayoutInflater().inflate(R.layout.window_popup, null);
popupWindow = new PopupWindow(layout,
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
popupWindow.setAnimationStyle(R.style.Popupwindow);//包括进入和退出两个动画
popupWindow.showAtLocation(view, Gravity.LEFT | Gravity.BOTTOM, 0, 0);
//popupWindow.showAsDropDown(view);
setButtonListeners(layout);
}
@Click
void bottomwindow(View view) {
if (popupWindow != null && popupWindow.isShowing()) {
return;
}
LinearLayout layout = (LinearLayout) getLayoutInflater().inflate(R.layout.window_popup, null);
popupWindow = new PopupWindow(layout,
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
popupWindow.setAnimationStyle(R.style.Popupwindow);
int\[\] location = new int\[2\];
view.getLocationOnScreen(location);
popupWindow.showAtLocation(view, Gravity.LEFT | Gravity.BOTTOM, 0, -location\[1\]);
//popupWindow.showAsDropDown(view);
setButtonListeners(layout);
}
private void setButtonListeners(LinearLayout layout) {
Button music = (Button) layout.findViewById(R.id.music);
music.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (popupWindow != null && popupWindow.isShowing()) {
toastUtil.showShortToast("music");
popupWindow.dismiss();
}
}
});
Button movie = (Button) layout.findViewById(R.id.movie);
movie.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (popupWindow != null && popupWindow.isShowing()) {
toastUtil.showShortToast("movie");
popupWindow.dismiss();
}
}
});
Button photo = (Button) layout.findViewById(R.id.photo);
photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (popupWindow != null && popupWindow.isShowing()) {
toastUtil.showShortToast("photo");
popupWindow.dismiss();
}
}
});
Button cancel = (Button) layout.findViewById(R.id.cancel);
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (popupWindow != null && popupWindow.isShowing()) {
popupWindow.dismiss();
}
}
});
}
从上面代码可以看出,点击上面和下面的按钮代码略微不同,因为这里我希望PopupWindow一直是从界面的底部慢慢滑入进入的,所以要控制下位置。关于PopupWindow的显示位置,它既提供了showAtLocation方法精确控制,也提供了showAsDropDown(view)方法简单控制。
滑入滑出的动画效果代码如下,需要注意的是,PopupWindow需要两个动画:一个进入,一个退出,如果只给定一个动画,可能会看不到动画的效果。
/res/values/styles.xml
<style name="Popupwindow">
<item name="android:windowEnterAnimation">@anim/slide_in_bottom</item>
<item name="android:windowExitAnimation">@anim/slide_out_bottom</item>
</style>
/res/anim/slide_in_bottom.xml
<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/decelerate_interpolator"
android:fromYDelta="100%" android:toYDelta="0"
android:duration="400"/>
/res/anim/slide_out_bottom.xml
<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/accelerate_interpolator"
android:fromYDelta="0" android:toYDelta="100%"
android:duration="200"/>
(3)使用PopupWindow还有不少需要注意的地方,例如你上面看到的代码中很多判断popupwindow是否为null或者是否正在显示等,有一个情况是,如果用户点击返回键,默认情况下Activity就要退出了,这个时候PopupWindow没有dismiss,容易出现内存泄露的报错,所以我们要处理下这个问题,如果用户点击返回键的时候PopupWindow正在显示的话那么就dismiss PopupWindow就好了。
@Override
public void onBackPressed() {
if (popupWindow != null && popupWindow.isShowing()) {
popupWindow.dismiss();
}else{
super.onBackPressed();
}
}
OK,差不多就是这些了,希望会有帮助,Enjoy!:-)
来源:http://hujiaweibujidao.github.io/blog/2015/07/04/android-popupmenu-and-popupwindow/
Written by hujiawei Posted at http://hujiaweibujidao.github.io