PopupWindow 模拟通知弹出

最近遇到一个需求，下面记录下实现方法 以及遇到的一些坑

需求如下：当app在后台时 收到push消息用系统的Notification进行通知；当app在前台时 收到push后采用自定义风格弹出通知

效果如下：


第一种情况这里不探究  第二种情况这里采用PopWindow实现

步骤：

一 、实现自定义PopWindow类

public class TuyaPopWindow extends PopupWindow {

    private Activity mContext;

    private View view;

    //private ImageView iv_icon;
    private TextView tv_title;
    private TextView tv_content;

    private Handler mHandler;

    public TuyaPopWindow(View contentView, final Activity mContext) {
        super(contentView, WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.WRAP_CONTENT, true);
        this.view = contentView;
        this.mContext = mContext;
        L.d("huohuo", "mContext:" + mContext);
        mHandler = new Handler(mContext.getMainLooper());
        //this.iv_icon= (ImageView) contentView.findViewById(R.id.iv_push_icon);
        this.tv_title = (TextView) contentView.findViewById(R.id.tv_push_title);
        this.tv_content = (TextView) contentView.findViewById(R.id.tv_push_msg);

        tv_title.setText("设备：客厅插座");
        tv_content.setText("xxxxx");


        // 设置外部可点击

        // mMenuView添加OnTouchListener监听判断获取触屏位置如果在选择框外面则销毁弹出框
        this.view.setOnTouchListener(new View.OnTouchListener() {

            public boolean onTouch(View v, MotionEvent event) {

                //int height = view.findViewById(R.id.pop_layout).getTop();

                // int y = (int) event.getY();
                if (event.getAction() == MotionEvent.ACTION_UP) {
                    //if (y < height) {
                    dismiss();
                    //}
                }
                return true;
            }
        });

        this.setFocusable(false);
        this.setTouchable(true);
        this.setOutsideTouchable(false);
        this.update();

        // 实例化一个ColorDrawable颜色为半透明
        this.setBackgroundDrawable(new BitmapDrawable());        // 设置弹出窗体的背景

        this.setAnimationStyle(R.style.take_photo_anim);
        this.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);

    }


    public void show() {
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                //适配8.0系统
                TuyaPopWindow.this.showAtLocation((mContext.findViewById(android.R.id.content)), Gravity.NO_GRAVITY, 0, 0);
                //TuyaPopWindow.this.showAsDropDown(view, 0, 0);
            }
        });

        //2s 消失
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                TuyaPopWindow.this.dismiss();
            }
        }, 2000);

    }
}

二 、 定义PopWindow弹出位置

           TuyaPopWindow.this.showAtLocation((mContext.findViewById(android.R.id.content)), Gravity.NO_GRAVITY, 0, 0);

这里要注意的是不要用这个方法，因为在8.0系统上这样会显示在布局底部，具体原因待探究

TuyaPopWindow.this.showAsDropDown(view, 0, 0);

     
还有一点在设置popupWindow属性的时候 需要执行设置这个属性

this.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);

因为在4.0系统上会把状态栏算入布局中 这样会导致popupWindow覆盖掉状态栏

三、定义PopWindow 弹出动画
通过设置PopWindow的属性来实现

 this.setAnimationStyle(R.style.take_photo_anim);

这里要用到的是style属性

首先我们需要声明 进入和离开的动画

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">

    <translate
        android:duration="500"
        android:fromYDelta="-100%"
        android:toYDelta="0" />
    <alpha
        android:duration="500"
        android:fromAlpha="0.5"
        android:toAlpha="1.0" />
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="500"
        android:fromYDelta="0"
        android:toYDelta="-100%" />
    <alpha
        android:duration="500"
        android:fromAlpha="1.0"
        android:toAlpha="0.5" />
</set>

申明style

<style name="take_photo_anim" parent="android:Animation">
        <item name="android:windowEnterAnimation">@anim/pop_enter_anim</item>
        <item name="android:windowExitAnimation">@anim/pop_exit_anim</item>
    </style>

四、由于PopupWindow是依赖于Activity的，所以我们需要记录前台Activity

public class Constant {
     //前台 activity 栈
    private static LinkedList<Activity> foreActivityStack = new LinkedList<>();
   
    public static void attachForeActivity(Activity activity) {
        if (foreActivityStack.indexOf(activity) == -1) foreActivityStack.push(activity);
        //Log.e("huohuo","attachForeActivity  size："+foreActivityStack.size()+"  push:"+activity);

    }

    public static void detachForeActivity(Activity activity) {

        foreActivityStack.remove(activity);
        //foreActivityStack.pop();
        //Log.e("huohuo","detachForeActivity size:"+foreActivityStack.size()+"  pop:"+activity);
    }

    public static Activity getForeActivity(){
        if(foreActivityStack.isEmpty())
            return null;
        //return foreActivityStack.peek().get();
        return foreActivityStack.peek();
    }
}

我们在每个Activity的onStart() onStop()方法中都调用

Constant.attachForeActivity(this);
Constant.detachForeActivity(this);

五、调用

if (Constant.getForeActivity() != null) {
            //应用在前台
            L.d(TAG, "getForeActivity true");
            View contentView = LayoutInflater.from(Constant.getForeActivity()).inflate(R.layout.push_custom_layout, null);
            TuyaPopWindow popWindow = new TuyaPopWindow(contentView,Constant.getForeActivity(), notify);
            popWindow.show();
        }