Unable to add window？ 解决PopupWi

本着因为项目中需要做半透明的引导层, git上也有相应的TourGuide开源项目，但是功能需求不符。为了定制所需要的界面所以我想到了用PopupWindow弹窗 半透明来实现了界面的引导层。

LayoutInflater mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

View view = mInflater.inflate(R.layout.layout_guild_worker,null);

//        view.startAnimation(AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fade_ins));

popupWindow=newPopupWindow(view, LinearLayoutCompat.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT,true);

//在PopupWindow里面就加上下面代码，让键盘弹出时，不会挡住pop窗口。

popupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);

popupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);

popupWindow.setFocusable(true);

ColorDrawable dw =newColorDrawable(0x00000000);

popupWindow.setBackgroundDrawable(dw);

backgroundAlpha(0.5f);

popupWindow.showAtLocation(findViewById(R.id.layout), Gravity.BOTTOM

,0,0);

popupWindow.setOnDismissListener(newPopupWindow.OnDismissListener() {

@Override

public voidonDismiss() {

backgroundAlpha(1f);

}

});
view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (popupWindow.isShowing()) {
                    popupWindow.dismiss();
                }

            }
        });

很快问题就来了，debug运行后，一打开界面就在

popupWindow.showAtLocation(findViewById(R.id.layout), Gravity.BOTTOM,0,0); 处报错误了，

百度这个问题，说的都是什么上下文生命周期的问题， 并不适用我们今天碰到的问题

解决：

findViewById(R.id.layout).post(newRunnable() {

public voidrun() {

popupWindow.showAtLocation(findViewById(R.id.layout), Gravity.BOTTOM

,0,0);

}

});

顺便粘出设置背景透明度backgroundAlpha（）代码：

public voidbackgroundAlpha(floatbgAlpha) {

WindowManager.LayoutParams lp = getWindow().getAttributes();

lp.alpha= bgAlpha;//0.0-1.0

getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);

getWindow().setAttributes(lp);

}