java - 使用 Runnable Thread Android 创建弹出窗口

Question

我正在尝试创建可运行的弹出窗口，但我做不到。我总是得到 "NULLPOINTEREXPEXTIONS" 我几乎完成了我的 android 应用程序，唯一剩下的就是一段时间后显示弹出窗口，我使用 runnable 来显示弹出窗口

这是我的代码，错误生成这一行

View layout = inflater.inflate(R.layout.popup_layout,(ViewGroup) findViewById(R.id.popup_element));

注意:popup_element 是弹出布局 xml 文件的 ID

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/popup_element"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#444444"
android:orientation="vertical"
android:padding="10sp" >


 public void run() {
             //Do something after 100ms
              initiatePopupWindow();
           }

           private void initiatePopupWindow() {
           try {
           // We need to get the instance of the LayoutInflater
           LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
           View layout = inflater.inflate(R.layout.popup_layout,(ViewGroup) findViewById(R.id.popup_element));
            pwindo = new PopupWindow(layout, 300, 370, true);
           pwindo.showAtLocation(layout, Gravity.CENTER, 0, 0);

           Button btnClosePopup = (Button) layout.findViewById(R.id.btn_close_popup);
           btnClosePopup.setOnClickListener(cancel_button_click_listener);

           } catch (Exception e) {
           e.printStackTrace();
           }
        }

           private OnClickListener cancel_button_click_listener = new OnClickListener() {
           public void onClick(View v) {

        pwindo.dismiss();

           }
           };

         }, 700);
        }
     }

错误日志

 D/gralloc_goldfish(906): Emulator without GPU emulation detected.
 W/System.err(906): java.lang.NullPointerException
 W/System.err(906): 	at com.example.runnable_with_popup.MainActivity$1.initiatePopupWindow(MainActivity.java:43)
 W/System.err(906): 	at com.example.runnable_with_popup.MainActivity$1.run(MainActivity.java:34)
 W/System.err(906): 	at android.os.Handler.handleCallback(Handler.java:730)
 W/System.err(906): 	at android.os.Handler.dispatchMessage(Handler.java:92)
 W/System.err(906): 	at android.os.Looper.loop(Looper.java:137)
 W/System.err(906): 	at android.app.ActivityThread.main(ActivityThread.java:5103)
 W/System.err(906): 	at java.lang.reflect.Method.invokeNative(Native Method)
 W/System.err(906): 	at java.lang.reflect.Method.invoke(Method.java:525)
 W/System.err(906): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
 W/System.err(906): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
 W/System.err(906): 	at dalvik.system.NativeStart.main(Native Method)

请帮我解决这个问题。我在互联网上搜索但没有找到与我的问题相关的示例或问题帮助将不胜感激

谢谢

Answer 1

父级可能丢失，在最后一部分放假

View layout = inflater.inflate(R.layout.popup_layout,(ViewGroup) findViewById(R.id.popup_element),false);