非活动类中的弹出窗口Android

Question

我想在我的活动中打开一个弹出窗口，但我想实现另一个类的弹出窗口。我使用这个tutorial，但我的应用程序崩溃。我所说的方法init（）和popupInit（）从我的活动和其他一切是在这里：

package com.example.victwo; 

import android.app.ActionBar.LayoutParams; 
import android.content.Context; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.PopupWindow; 
import android.widget.TextView; 

public class PopupAudio implements OnClickListener { 

    LinearLayout layoutOfPopup; 
    PopupWindow popupMessage; 
    Button popRecord, popStopRecord, popPlay, popStopPlaying; 
    TextView popupText; 

    public void popupInit() { 
     popRecord.setOnClickListener(this); 
     popStopRecord.setOnClickListener(this); 
     popupMessage = new PopupWindow(layoutOfPopup, LayoutParams.WRAP_CONTENT, 
       LayoutParams.WRAP_CONTENT); 
     popupMessage.setContentView(layoutOfPopup); 
    } 

    public void init(Context context) { 
     popRecord = new Button(context); 
     popRecord.setId(112); 
     layoutOfPopup = new LinearLayout(context); 
     popRecord.setText("REC"); 
     layoutOfPopup.setOrientation(1); 
     layoutOfPopup.addView(popRecord); 
    } 

    @Override 
    public void onClick(View v) { 
     // TODO Auto-generated method stub 
     switch(v.getId()) { 
     case 112: 

      break; 
     } 
    } 

} 

这就是在给定的logcat中：

04-14 21:22:43.095: E/AndroidRuntime(575): FATAL EXCEPTION: main 
04-14 21:22:43.095: E/AndroidRuntime(575): java.lang.NullPointerException 
04-14 21:22:43.095: E/AndroidRuntime(575): at com.example.victwo.PopupAudio.popupInit(PopupAudio.java:21) 
04-14 21:22:43.095: E/AndroidRuntime(575): at com.example.victwo.NoteActivity.onOptionsItemSelected(NoteActivity.java:172) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.app.Activity.onMenuItemSelected(Activity.java:2205) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:372) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v7.app.ActionBarActivity.superOnMenuItemSelected(ActionBarActivity.java:244) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v7.app.ActionBarActivityDelegateBase.onMenuItemSelected(ActionBarActivityDelegateBase.java:352) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v7.app.ActionBarActivity.onMenuItemSelected(ActionBarActivity.java:130) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v7.app.ActionBarActivityDelegateBase.onMenuItemSelected(ActionBarActivityDelegateBase.java:357) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:777) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:158) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:922) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v7.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:544) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.support.v7.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:105) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.view.View.performClick(View.java:2485) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.view.View$PerformClick.run(View.java:9080) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.os.Handler.handleCallback(Handler.java:587) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.os.Handler.dispatchMessage(Handler.java:92) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.os.Looper.loop(Looper.java:123) 
04-14 21:22:43.095: E/AndroidRuntime(575): at android.app.ActivityThread.main(ActivityThread.java:3683) 
04-14 21:22:43.095: E/AndroidRuntime(575): at java.lang.reflect.Method.invokeNative(Native Method) 
04-14 21:22:43.095: E/AndroidRuntime(575): at java.lang.reflect.Method.invoke(Method.java:507) 
04-14 21:22:43.095: E/AndroidRuntime(575): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
04-14 21:22:43.095: E/AndroidRuntime(575): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
04-14 21:22:43.095: E/AndroidRuntime(575): at dalvik.system.NativeStart.main(Native Method) 

我不知道是什么问题，我会非常感激，如果你帮我:)

Answer 1

检查你的代码popStopRecord是null。您没有实例化它

popStopRecord.setOnClickListener(this); 

这是行崩溃。