Android 不依賴activity的全局懸浮窗實現

Android懸浮窗實現
實現基礎

Android懸浮窗實現使用WindowManager ，WindowManager介紹　　

通過Context.getSystemService(Context.WINDOW_SERVICE)可以獲得 WindowManager對象。
每一個WindowManager對象都和一個特定的 Display綁定。
想要獲取一個不同的display的WindowManager，可以用 createDisplayContext(Display)來獲取那個display的 Context，之后再使用：Context.getSystemService(Context.WINDOW_SERVICE)來獲取WindowManager。
使用WindowManager可以在其他應用最上層，甚至手機桌面最上層顯示窗口。
調用的是WindowManager繼承自基類的addView方法和removeView方法來顯示和隱藏窗口。具體見后面的實例。

 另：API 17推出了Presentation，它將自動獲取display的Context和WindowManager，可以方便地在另一個display上顯示窗口。

WindowManager介紹

　　通過Context.getSystemService(Context.WINDOW_SERVICE)可以獲得 WindowManager對象。

　　每一個WindowManager對象都和一個特定的 Display綁定。

　　想要獲取一個不同的display的WindowManager，可以用 createDisplayContext(Display)來獲取那個display的 Context，之后再使用：

Context.getSystemService(Context.WINDOW_SERVICE)來獲取WindowManager。


　　使用WindowManager可以在其他應用最上層，甚至手機桌面最上層顯示窗口。

　　調用的是WindowManager繼承自基類的addView方法和removeView方法來顯示和隱藏窗口。具體見后面的實例。


　　另：API 17推出了Presentation，它將自動獲取display的Context和WindowManager，可以方便地在另一個display上顯示窗口。


WindowManager實現懸浮窗例子

聲明權限

　　首先在manifest中添加如下權限：

    <!-- 顯示頂層浮窗 -->
    <uses-permissionandroid:name="android.permission.SYSTEM_ALERT_WINDOW"/>

注意：在MIUI上需要在設置中打開本應用的”顯示懸浮窗”開關，並且重啟應用，否則懸浮窗只能顯示在本應用界面內，不能顯示在手機桌面上。

服務獲取和基本參數設置

    // 獲取應用的Context
    mContext= context.getApplicationContext();
    // 獲取WindowManager
    mWindowManager=(WindowManager) mContext
    .getSystemService(Context.WINDOW_SERVICE);

參數設置：

    final WindowManager.LayoutParams params = new WindowManager.LayoutParams();
            // 類型
            params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
            // WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
            // 設置flag
            int flags = WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
            // | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
            // 如果設置了WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE，彈出的View收不到Back鍵的事件
            params.flags = flags;
            // 不設置這個彈出框的透明遮罩顯示為黑色
            params.format = PixelFormat.TRANSLUCENT;
            // FLAG_NOT_TOUCH_MODAL不阻塞事件傳遞到后面的窗口
            // 設置 FLAG_NOT_FOCUSABLE 懸浮窗口較小時，后面的應用圖標由不可長按變為可長按
            // 不設置這個flag的話，home頁的划屏會有問題
            params.width = LayoutParams.MATCH_PARENT;
            params.height = LayoutParams.MATCH_PARENT;
            params.gravity = Gravity.CENTER;

點擊和按鍵事件

　　除了View中的各個控件的點擊事件之外，彈窗View的消失控制需要一些處理。

　　點擊彈窗外部可隱藏彈窗的效果，首先，懸浮窗是全屏的，只不過最外層的是透明或者半透明的：

　　布局如下：

    <?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:layout_gravity="center"
        android:background="@color/darken_background"
        android:gravity="center"
        android:orientation="vertical" >
        <RelativeLayout
            android:id="@+id/popup_window"
            android:layout_width="@dimen/dialog_window_width"
            android:layout_height="@dimen/dialog_window_height"
            android:background="@color/white"
            android:orientation="vertical" >
            <TextView
                android:id="@+id/title"
                android:layout_width="match_parent"
                android:layout_height="@dimen/dialog_title_height"
                android:gravity="center"
                android:text="@string/default_title"
                android:textColor="@color/dialog_title_text_color"
                android:textSize="@dimen/dialog_title_text_size" />
            <View
                android:id="@+id/title_divider"
                android:layout_width="match_parent"
                android:layout_height="2dp"
                android:layout_below="@id/title"
                android:background="@drawable/dialog_title_divider" />
            <TextView
                android:id="@+id/content"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/title_divider"
                android:gravity="center"
                android:padding="@dimen/dialog_content_padding_side"
                android:text="@string/default_content"
                android:textColor="@color/dialog_content_text_color"
                android:textSize="@dimen/dialog_content_text_size" />
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:orientation="horizontal"
                android:paddingBottom="@dimen/dialog_content_padding_bottom"
                android:paddingLeft="@dimen/dialog_content_padding_side"
                android:paddingRight="@dimen/dialog_content_padding_side" >
                <Button
                    android:id="@+id/negativeBtn"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:background="@drawable/promote_window_negative_btn_selector"
                    android:focusable="true"
                    android:padding="@dimen/dialog_button_padding"
                    android:text="@string/default_btn_cancel"
                    android:textColor="@color/dialog_negative_btn_text_color"
                    android:textSize="@dimen/dialog_button_text_size" />
                <Button
                    android:id="@+id/positiveBtn"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginLeft="18dp"
                    android:layout_weight="1"
                    android:background="@drawable/promote_window_positive_btn_selector"
                    android:focusable="true"
                    android:padding="@dimen/dialog_button_padding"
                    android:text="@string/default_btn_ok"
                    android:textColor="@color/dialog_positive_btn_text_color"
                    android:textSize="@dimen/dialog_button_text_size" />
            </LinearLayout>
        </RelativeLayout>
    </LinearLayout>
    popupwindow.xml

點擊外部可消除設置：

    // 點擊窗口外部區域可消除
            // 這點的實現主要將懸浮窗設置為全屏大小，外層有個透明背景，中間一部分視為內容區域
            // 所以點擊內容區域外部視為點擊懸浮窗外部
            final View popupWindowView = view.findViewById(R.id.popup_window);// 非透明的內容區域
            view.setOnTouchListener(new OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    LogUtil.i(LOG_TAG, "onTouch");
                    int x = (int) event.getX();
                    int y = (int) event.getY();
                    Rect rect = new Rect();
                    popupWindowView.getGlobalVisibleRect(rect);
                    if (!rect.contains(x, y)) {
                        WindowUtils.hidePopupWindow();
                    }
                    LogUtil.i(LOG_TAG, "onTouch : " + x + ", " + y + ", rect: "
                            + rect);
                    return false;
                }
            });

點擊Back鍵可隱藏彈窗：

　　注意Flag不能設置WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE。

     點擊back鍵可消除
            view.setOnKeyListener(new OnKeyListener() {
                @Override
                public boolean onKey(View v, int keyCode, KeyEvent event) {
                    switch (keyCode) {
                    case KeyEvent.KEYCODE_BACK:
                        WindowUtils.hidePopupWindow();
                        return true;
                    default:
                        return false;
                    }
                }
            });

完整效果


　　完整代碼：

MainActivity

    package com.example.hellowindow;
    import android.app.Activity;
    import android.os.Bundle;
    import android.os.Handler;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    public class MainActivity extends Activity {
        private Handler mHandler = null;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            mHandler = new Handler();
            Button button = (Button) findViewById(R.id.button);
            button.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    mHandler.postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            WindowUtils.showPopupWindow(MainActivity.this);
                        }
                    }, 1000 * 3);
                }
            });
        }
    }

WindowUtils

    package com.example.hellowindow;
    import android.content.Context;
    import android.graphics.PixelFormat;
    import android.graphics.Rect;
    import android.view.Gravity;
    import android.view.KeyEvent;
    import android.view.LayoutInflater;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.View.OnKeyListener;
    import android.view.View.OnTouchListener;
    import android.view.WindowManager;
    import android.view.View.OnClickListener;
    import android.view.WindowManager.LayoutParams;
    import android.widget.Button;
    /**
     * 彈窗輔助類
     *
     * @ClassName WindowUtils
     *
     *
     */
    public class WindowUtils {
        private static final String LOG_TAG = "WindowUtils";
        private static View mView = null;
        private static WindowManager mWindowManager = null;
        private static Context mContext = null;
        public static Boolean isShown = false;
        /**
         * 顯示彈出框
         *
         * @param context
         * @param view
         */
        public static void showPopupWindow(final Context context) {
            if (isShown) {
                LogUtil.i(LOG_TAG, "return cause already shown");
                return;
            }
            isShown = true;
            LogUtil.i(LOG_TAG, "showPopupWindow");
            // 獲取應用的Context
            mContext = context.getApplicationContext();
            // 獲取WindowManager
            mWindowManager = (WindowManager) mContext
                    .getSystemService(Context.WINDOW_SERVICE);
            mView = setUpView(context);
            final WindowManager.LayoutParams params = new WindowManager.LayoutParams();
            // 類型
            params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
            // WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
            // 設置flag
            int flags = WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
            // | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
            // 如果設置了WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE，彈出的View收不到Back鍵的事件
            params.flags = flags;
            // 不設置這個彈出框的透明遮罩顯示為黑色
            params.format = PixelFormat.TRANSLUCENT;
            // FLAG_NOT_TOUCH_MODAL不阻塞事件傳遞到后面的窗口
            // 設置 FLAG_NOT_FOCUSABLE 懸浮窗口較小時，后面的應用圖標由不可長按變為可長按
            // 不設置這個flag的話，home頁的划屏會有問題
            params.width = LayoutParams.MATCH_PARENT;
            params.height = LayoutParams.MATCH_PARENT;
            params.gravity = Gravity.CENTER;
            mWindowManager.addView(mView, params);
            LogUtil.i(LOG_TAG, "add view");
        }
        /**
         * 隱藏彈出框
         */
        public static void hidePopupWindow() {
            LogUtil.i(LOG_TAG, "hide " + isShown + ", " + mView);
            if (isShown && null != mView) {
                LogUtil.i(LOG_TAG, "hidePopupWindow");
                mWindowManager.removeView(mView);
                isShown = false;
            }
        }
        private static View setUpView(final Context context) {
            LogUtil.i(LOG_TAG, "setUp view");
            View view = LayoutInflater.from(context).inflate(R.layout.popupwindow,
                    null);
            Button positiveBtn = (Button) view.findViewById(R.id.positiveBtn);
            positiveBtn.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    LogUtil.i(LOG_TAG, "ok on click");
                    // 打開安裝包
                    // 隱藏彈窗
                    WindowUtils.hidePopupWindow();
                }
            });
            Button negativeBtn = (Button) view.findViewById(R.id.negativeBtn);
            negativeBtn.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    LogUtil.i(LOG_TAG, "cancel on click");
                    WindowUtils.hidePopupWindow();
                }
            });
            // 點擊窗口外部區域可消除
            // 這點的實現主要將懸浮窗設置為全屏大小，外層有個透明背景，中間一部分視為內容區域
            // 所以點擊內容區域外部視為點擊懸浮窗外部
            final View popupWindowView = view.findViewById(R.id.popup_window);// 非透明的內容區域
            view.setOnTouchListener(new OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    LogUtil.i(LOG_TAG, "onTouch");
                    int x = (int) event.getX();
                    int y = (int) event.getY();
                    Rect rect = new Rect();
                    popupWindowView.getGlobalVisibleRect(rect);
                    if (!rect.contains(x, y)) {
                        WindowUtils.hidePopupWindow();
                    }
                    LogUtil.i(LOG_TAG, "onTouch : " + x + ", " + y + ", rect: "
                            + rect);
                    return false;
                }
            });
            // 點擊back鍵可消除
            view.setOnKeyListener(new OnKeyListener() {
                @Override
                public boolean onKey(View v, int keyCode, KeyEvent event) {
                    switch (keyCode) {
                    case KeyEvent.KEYCODE_BACK:
                        WindowUtils.hidePopupWindow();
                        return true;
                    default:
                        return false;
                    }
                }
            });
            return view;
        }
    }


參考文章

http://blog.csdn.net/robertcpp/article/details/51628643
---------------------
作者：hubertlou
來源：CSDN
原文：https://blog.csdn.net/qq_28273051/article/details/75461159
版權聲明：本文為博主原創文章，轉載請附上博文鏈接！