iOS实现底部弹出PopupWindow效果 iOS改变背景透明效
底部弹出PopupWindow,背景变为半透明效果,采用两种方式实现
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); }
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