底部弹出PopupWindow并且背景变为半透明效果

来源：互联网发布：阿里云华北5是哪里编辑：程序博客网时间：2024/05/15 02:16

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="http://schemas.android.com/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="http://schemas.android.com/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() {            @Override            public 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="http://schemas.android.com/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);}

原文地址：

http://blog.csdn.NET/LANG791534167/article/details/48985101

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