来自：/LANG791534167/article/details/48985101
先来看看运行效果图
[方式一]实现从底部弹出PopupWindow
原理：定义一个高度为wrap_content的PopupWindow布局文件，根据屏幕底部的位置显示在Bottom
1.首先定义一个高度为wrap_content的PopupWindow布局文件
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"android:padding="8dp"android:orientation="vertical" ><LinearLayout android:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"android:orientation="vertical"android:background="@drawable/shape_info_bg"><TextView android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="8dp"android:gravity="center"android:textColor="@color/theme_blue"android:text="拍照"/><View android:layout_width="match_parent" android:layout_height="0.2dp"android:background="@color/theme_blue"/><TextView android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="8dp"android:gravity="center"android:textColor="@color/theme_blue"android:text="相冊"/></LinearLayout><RelativeLayout android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="5dp"android:padding="1dp"><Button android:id="@+id/btn_cancle"android:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"android:padding="8dp"android:textColor="@color/theme_blue"android:background="@drawable/shape_info_bg"android:text="取消" /></RelativeLayout></LinearLayout>
2.在PopupWindow所在的Activity根布局中声明id（在弹出PopupWindow作为位置参考的相对View）
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"android:id="@+id/root_main"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" android:background="@color/white"><Button android:layout_width="match_parent"android:layout_height="wrap_content"android:text="底部弹出PopupWindow"android:onClick="openPop"/><Button android:layout_width="match_parent"android:layout_height="wrap_content"android:text="半透明底部PopupWindow"android:onClick="openPop2"/></LinearLayout>
3.MainActivity中点击按钮弹出PopupWindow
/** 弹出底部对话框 */public void openPop(View view) {View popView = LayoutInflater.from(mContext).inflate(R.layout.pop_bottom, null);View rootView = findViewById(R.id.root_main); // 當前頁面的根佈局final PopupWindow popupWindow = new PopupWindow(popView, LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);setBackgroundAlpha(0.5f);//设置屏幕透明度popupWindow.setBackgroundDrawable(new BitmapDrawable());popupWindow.setFocusable(true);// 点击空白处时，隐藏掉pop窗口// 顯示在根佈局的底部popupWindow.showAtLocation(rootView, Gravity.BOTTOM | Gravity.LEFT, 0,0);}
4.设置背景变为半透明效果，由于PopupWindow中并未设置背景色，所以弹出时PopupWindow以外的部分显示当前Acitivity的内容，设置背景色原理通过设置当前Activity所在屏幕的透明度来达到背景透明的效果！在退出时popupWindow时，需要恢复屏幕原有透明度
popupWindow.setOnDismissListener(new OnDismissListener() {@Overridepublic void onDismiss() {// popupWindow隐藏时恢复屏幕正常透明度setBackgroundAlpha(1.0f);}});
/*** 设置添加屏幕的背景透明度* * @param bgAlpha* 屏幕透明度0.0-1.0 1表示完全不透明*/public void setBackgroundAlpha(float bgAlpha) {WindowManager.LayoutParams lp = ((Activity) mContext).getWindow().getAttributes();lp.alpha = bgAlpha;((Activity) mContext).getWindow().setAttributes(lp);}
[方式二]全屏PopupWindow实现底部弹出，背景半透明
原理：弹出一个全屏popupWindow，高度为match_parent,将根布局的Gravity属性设置bottom,根布局背景设置为一个半透明的颜色#36000000， 弹出时全屏的popupWindow半透明效果背景覆盖了在Activity之上 给人感觉上是popupWindow弹出后，背景变成半透明
布局文件
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:padding="8dp"android:orientation="vertical" android:background="#36000000"android:gravity="bottom"><LinearLayout android:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"android:orientation="vertical"android:background="@drawable/shape_info_bg"><TextView android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="8dp"android:gravity="center"android:textColor="@color/theme_blue"android:text="拍照"/><View android:layout_width="match_parent" android:layout_height="0.2dp"android:background="@color/theme_blue"/><TextView android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="8dp"android:gravity="center"android:textColor="@color/theme_blue"android:text="相冊"/></LinearLayout><RelativeLayout android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="5dp"android:padding="1dp"><Button android:id="@+id/btn_cancle"android:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"android:padding="8dp"android:textColor="@color/theme_blue"android:background="@drawable/shape_info_bg"android:text="取消" /></RelativeLayout></LinearLayout>
弹出方法和方式一相似，不过不用再监听popupWindow的退出事件
/*** 弹出底部对话框，达到背景背景透明效果* * 实现原理：弹出一个全屏popupWindow,将Gravity属性设置bottom,根背景设置为一个半透明的颜色，* 弹出时popupWindow的半透明效果背景覆盖了在Activity之上 给人感觉上是popupWindow弹出后，背景变成半透明*/public void openPop2(View view) {View popView = LayoutInflater.from(mContext).inflate(R.layout.pop_bottom_alpha, null);View rootView = findViewById(R.id.root_main); // 當前頁面的根佈局final PopupWindow popupWindow = new PopupWindow(popView,LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);// 设置弹出动画popupWindow.setAnimationStyle(R.style.AnimationFadeBottom);popupWindow.setBackgroundDrawable(new BitmapDrawable());// 顯示在根佈局的底部popupWindow.showAtLocation(rootView, Gravity.BOTTOM | Gravity.LEFT, 0,0);}
