Android控件PopupWindow模仿ios底部弹窗

前言

在H5火热的时代，许多框架都出了底部弹窗的控件，在H5被称为弹出菜单ActionSheet，今天我们也来模仿一个ios的底部弹窗，取材于苹果QQ的选择头像功能。

正文

废话不多说，先来个今天要实现的效果图

整个PopupWindow的开启代码

private void openPopupWindow(View v) {
 //防止重复按按钮
 if (popupWindow != null && popupWindow.isShowing()) {
   return;
 }
 //设置PopupWindow的View
 View view = LayoutInflater.from(this).inflate(R.layout.view_popupwindow, null);
 popupWindow = new PopupWindow(view, RelativeLayout.LayoutParams.MATCH_PARENT,
     RelativeLayout.LayoutParams.WRAP_CONTENT);
 //设置背景,这个没什么效果，不添加会报错
 popupWindow.setBackgroundDrawable(new BitmapDrawable());
 //设置点击弹窗外隐藏自身
 popupWindow.setFocusable(true);
 popupWindow.setOutsideTouchable(true);
 //设置动画
 popupWindow.setAnimationStyle(R.style.PopupWindow);
 //设置位置
 popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, navigationHeight);
 //设置消失监听
 popupWindow.setOnDismissListener(this);
 //设置PopupWindow的View点击事件
 setOnPopupViewClick(view);
 //设置背景色
 setBackgroundAlpha(0.5f);
}

步骤分析：

PopupWindow的布局
PopupWindow的创建
PopupWindow添加动画效果
PopupWindow设置背景阴影
PopupWindow监听点击事件
获取NavigationBar的高度

PopupWindow的布局：在Layout中，设计我们需要的布局

<?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="wrap_content" android:orientation="vertical">

<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="8dp" android:background="@drawable/popup_shape" android:orientation="vertical">

<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="16dp" android:text="你可以将照片上传至照片墙" android:textColor="#666" android:textSize="14sp" />

<View android:layout_width="match_parent" android:layout_height="0.1px" android:background="#888" />

<TextView android:id="@+id/tv_pick_phone" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="16dp" android:text="从手机相册选择" android:textColor="#118" android:textSize="18sp" />

<View android:layout_width="match_parent" android:layout_height="0.1px" android:background="#888" />

<TextView android:id="@+id/tv_pick_zone" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="16dp" android:text="从空间相册选择" android:textColor="#118" android:textSize="18sp" />
 </LinearLayout>

<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="8dp" android:background="@drawable/popup_shape">

<TextView android:id="@+id/tv_cancel" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="16dp" android:text="取消" android:textColor="#118" android:textSize="18sp" android:textStyle="bold" />
 </LinearLayout>
</LinearLayout>

其效果是：

PopupWindow的创建：这个创建与我们普通的控件创建方法是一样的

//设置PopupWindow的View
View view = LayoutInflater.from(this).inflate(R.layout.view_popupwindow, null);
popupWindow = new PopupWindow(view, RelativeLayout.LayoutParams.MATCH_PARENT,
       RelativeLayout.LayoutParams.WRAP_CONTENT);

PopupWindow添加动画效果：我们创建一个anim文件夹，创建我们的out和in动画效果，然后在style添加我们的动画

<?xml version="1.0" encoding="utf-8"?>
<!--进入动画-->
<translate xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator" android:fromYDelta="100％" android:toYDelta="0" android:duration="200"/>

<?xml version="1.0" encoding="utf-8"?>
<!--退出动画-->
<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"/>

<!--弹窗动画-->
<style name="PopupWindow"> <item name="android:windowEnterAnimation">@anim/window_in</item> <item name="android:windowExitAnimation">@anim/window_out</item> </style>

//设置动画
popupWindow.setAnimationStyle(R.style.PopupWindow);

PopupWindow设置背景阴影：弹窗打开时设置透明度为0.5，弹窗消失时设置透明度为1

//设置屏幕背景透明效果
public void setBackgroundAlpha(float alpha) {
 WindowManager.LayoutParams lp = getWindow().getAttributes();
 lp.alpha = alpha;
 getWindow().setAttributes(lp);
}

PopupWindow监听点击事件：监听我们PopupWindow里面控件的点击事件

//设置PopupWindow的View点击事件
setOnPopupViewClick(view);

private void setOnPopupViewClick(View view) {
 TextView tv_pick_phone, tv_pick_zone, tv_cancel;
 tv_pick_phone = (TextView) view.findViewById(R.id.tv_pick_phone);
 tv_pick_zone = (TextView) view.findViewById(R.id.tv_pick_zone);
 tv_cancel = (TextView) view.findViewById(R.id.tv_cancel);
 tv_pick_phone.setOnClickListener(this);
 tv_pick_zone.setOnClickListener(this);
 tv_cancel.setOnClickListener(this);
}

获取NavigationBar的高度：这里需要适配有些手机没有NavigationBar有些手机有，这里以存在NavigationBar来演示
int resourceId = getResources().getIdentifier("navigation_bar_height", "dimen", "android");
navigationHeight = getResources().getDimensionPixelSize(resourceId);

对存在NavigationBar的手机上，设置其PopupWindow的出现位置
//设置位置
popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, navigationHeight);

对没有NavigationBar的手机上，设置其PopupWindow的出现位置
//设置位置
popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, 0);

源码

Github：https://github.com/AndroidHensen/IOSPopupWindow

public class MainActivity extends AppCompatActivity implements View.OnClickListener, PopupWindow.OnDismissListener {

private Button bt_open;
 private PopupWindow popupWindow;
 private int navigationHeight;

@Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);

bt_open = (Button) findViewById(R.id.bt_open);
   bt_open.setOnClickListener(this);

int resourceId = getResources().getIdentifier("navigation_bar_height", "dimen", "android");
   navigationHeight = getResources().getDimensionPixelSize(resourceId);
 }

@Override
 public void onClick(View v) {
   switch (v.getId()) {
     case R.id.bt_open:
       openPopupWindow(v);
       break;
     case R.id.tv_pick_phone:
       Toast.makeText(this, "从手机相册选择", Toast.LENGTH_SHORT).show();
       popupWindow.dismiss();
       break;
     case R.id.tv_pick_zone:
       Toast.makeText(this, "从空间相册选择", Toast.LENGTH_SHORT).show();
       popupWindow.dismiss();
       break;
     case R.id.tv_cancel:
       popupWindow.dismiss();
       break;
   }
 }

private void openPopupWindow(View v) {
   //防止重复按按钮
   if (popupWindow != null && popupWindow.isShowing()) {
     return;
   }
   //设置PopupWindow的View
   View view = LayoutInflater.from(this).inflate(R.layout.view_popupwindow, null);
   popupWindow = new PopupWindow(view, RelativeLayout.LayoutParams.MATCH_PARENT,
       RelativeLayout.LayoutParams.WRAP_CONTENT);
   //设置背景,这个没什么效果，不添加会报错
   popupWindow.setBackgroundDrawable(new BitmapDrawable());
   //设置点击弹窗外隐藏自身
   popupWindow.setFocusable(true);
   popupWindow.setOutsideTouchable(true);
   //设置动画
   popupWindow.setAnimationStyle(R.style.PopupWindow);
   //设置位置
   popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, navigationHeight);
   //设置消失监听
   popupWindow.setOnDismissListener(this);
   //设置PopupWindow的View点击事件
   setOnPopupViewClick(view);
   //设置背景色
   setBackgroundAlpha(0.5f);
 }

private void setOnPopupViewClick(View view) {
   TextView tv_pick_phone, tv_pick_zone, tv_cancel;
   tv_pick_phone = (TextView) view.findViewById(R.id.tv_pick_phone);
   tv_pick_zone = (TextView) view.findViewById(R.id.tv_pick_zone);
   tv_cancel = (TextView) view.findViewById(R.id.tv_cancel);
   tv_pick_phone.setOnClickListener(this);
   tv_pick_zone.setOnClickListener(this);
   tv_cancel.setOnClickListener(this);
 }

//设置屏幕背景透明效果
 public void setBackgroundAlpha(float alpha) {
   WindowManager.LayoutParams lp = getWindow().getAttributes();
   lp.alpha = alpha;
   getWindow().setAttributes(lp);
 }

@Override
 public void onDismiss() {
   setBackgroundAlpha(1);
 }
}