Question

我想在Activity中设置FrameLayout。这是我的代码：

FrameLayout fl = new FrameLayout(this);
fl = (FrameLayout ) findViewById(R.id.actioncontent);           
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);           
View myview =LayoutInflater.from(this).inflate(R.layout.wallpaper, null);
fl.removeAllViews();
fl.addView(myview);

我收到错误 NullPointerException 。

Answer 1

您需要使用inflator代替LayoutInflater.from(this)

LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            View myview =LayoutInflater.from(this).inflate(R.layout.wallpaper, null);
            fl.removeAllViews();
                fl.addView(myview);

将以上代码替换为以下

LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            View myview =inflater .inflate(R.layout.wallpaper, null);
            fl.removeAllViews();
                fl.addView(myview);

Answer 2

你没有说明'这个'是什么，或NPE正在发生的地方 - 但可能是'这个'提出了错误的背景。请尝试使用您的活动名称？例如，MainActivity.this

另外，如下所述，请从View myview =LayoutInflater.from(this).inflate替换为View myview = inflater.inflate

Answer 3

更改

LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

到

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

android中的layoutinflater nullpointerexception

3 个答案: