前言
在H5火熱的時代，許多框架都出了底部彈窗的控件，在H5被稱為彈出菜單ActionSheet，今天我們也來模仿一個ios的底部彈窗，取材于蘋果QQ的選擇頭像功能。
正文
廢話不多說，先來個今天要實現的效果圖
整個PopupWindow的開啟代碼
private void openPopupWindow(View v) { //防止重復按按鈕 if (popupWindow != null && popupWindow.isShowing()) { return; } //設置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); //設置背景,這個沒什么效果，不添加會報錯 popupWindow.setBackgroundDrawable(new BitmapDrawable()); //設置點擊彈窗外隱藏自身 popupWindow.setFocusable(true); popupWindow.setOutsideTouchable(true); //設置動畫 popupWindow.setAnimationStyle(R.style.PopupWindow); //設置位置 popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, navigationHeight); //設置消失監聽 popupWindow.setOnDismissListener(this); //設置PopupWindow的View點擊事件 setOnPopupViewClick(view); //設置背景色 setBackgroundAlpha(0.5f);}步驟分析：
PopupWindow的布局
PopupWindow的創建
PopupWindow添加動畫效果
PopupWindow設置背景陰影
PopupWindow監聽點擊事件
獲取NavigationBar的高度
PopupWindow的布局：在Layout中，設計我們需要的布局
<?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="你可以將照片上傳至照片墻" 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="從手機相冊選擇" 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="從空間相冊選擇" 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的創建：這個創建與我們普通的控件創建方法是一樣的
//設置PopupWindow的ViewView view = LayoutInflater.from(this).inflate(R.layout.view_popupwindow, null);popupWindow = new PopupWindow(view, RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
PopupWindow添加動畫效果：我們創建一個anim文件夾，創建我們的out和in動畫效果，然后在style添加我們的動畫
<?xml version="1.0" encoding="utf-8"?><!--進入動畫--><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"?><!--退出動畫--><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"/><!--彈窗動畫--><style name="PopupWindow"> <item name="android:windowEnterAnimation">@anim/window_in</item> <item name="android:windowExitAnimation">@anim/window_out</item> </style>
//設置動畫
popupWindow.setAnimationStyle(R.style.PopupWindow);
PopupWindow設置背景陰影：彈窗打開時設置透明度為0.5，彈窗消失時設置透明度為1
//設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監聽點擊事件：監聽我們PopupWindow里面控件的點擊事件
//設置PopupWindow的View點擊事件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);} 獲取NavigationBar的高度：這里需要適配有些手機沒有NavigationBar有些手機有，這里以存在NavigationBar來演示
int resourceId = getResources().getIdentifier("navigation_bar_height", "dimen", "android");
navigationHeight = getResources().getDimensionPixelSize(resourceId);
對存在NavigationBar的手機上，設置其PopupWindow的出現位置
//設置位置
popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, navigationHeight);
對沒有NavigationBar的手機上，設置其PopupWindow的出現位置
//設置位置
popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, 0);
源碼
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, "從手機相冊選擇", Toast.LENGTH_SHORT).show(); popupWindow.dismiss(); break; case R.id.tv_pick_zone: Toast.makeText(this, "從空間相冊選擇", Toast.LENGTH_SHORT).show(); popupWindow.dismiss(); break; case R.id.tv_cancel: popupWindow.dismiss(); break; } } private void openPopupWindow(View v) { //防止重復按按鈕 if (popupWindow != null && popupWindow.isShowing()) { return; } //設置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); //設置背景,這個沒什么效果，不添加會報錯 popupWindow.setBackgroundDrawable(new BitmapDrawable()); //設置點擊彈窗外隱藏自身 popupWindow.setFocusable(true); popupWindow.setOutsideTouchable(true); //設置動畫 popupWindow.setAnimationStyle(R.style.PopupWindow); //設置位置 popupWindow.showAtLocation(v, Gravity.BOTTOM, 0, navigationHeight); //設置消失監聽 popupWindow.setOnDismissListener(this); //設置PopupWindow的View點擊事件 setOnPopupViewClick(view); //設置背景色 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); } //設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); }}以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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