I am trying to show **Checkbox Status** by showing *Toast* whenever user do **Click** on *button* for that i am using AlertDialog, but getting Null Pointer Exception,

Complete Logcat:

```
07-12 06:32:44.851: E/AndroidRuntime(783): FATAL EXCEPTION: main
07-12 06:32:44.851: E/AndroidRuntime(783): java.lang.NullPointerException
07-12 06:32:44.851: E/AndroidRuntime(783):  at com.example.UploadActivity$2.onClick(UploadActivity.java:271)
07-12 06:32:44.851: E/AndroidRuntime(783):  at android.view.View.performClick(View.java:4204)
07-12 06:32:44.851: E/AndroidRuntime(783):  at android.view.View$PerformClick.run(View.java:17355)
07-12 06:32:44.851: E/AndroidRuntime(783):  at android.os.Handler.handleCallback(Handler.java:725)
07-12 06:32:44.851: E/AndroidRuntime(783):  at android.os.Handler.dispatchMessage(Handler.java:92)
07-12 06:32:44.851: E/AndroidRuntime(783):  at android.os.Looper.loop(Looper.java:137)
07-12 06:32:44.851: E/AndroidRuntime(783):  at android.app.ActivityThread.main(ActivityThread.java:5041)
07-12 06:32:44.851: E/AndroidRuntime(783):  at java.lang.reflect.Method.invokeNative(Native Method)
07-12 06:32:44.851: E/AndroidRuntime(783):  at java.lang.reflect.Method.invoke(Method.java:511)
07-12 06:32:44.851: E/AndroidRuntime(783):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-12 06:32:44.851: E/AndroidRuntime(783):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-12 06:32:44.851: E/AndroidRuntime(783):  at dalvik.system.NativeStart.main(Native Method)
07-12 06:32:50.332: E/Trace(1213): error opening trace file: No such file or directory (2)

```

loginbutton.setOnClickListener(new View.OnClickListener() {

```
                @Override
                    public void onClick(View v) {
                    SaveData();     
                    alertDialog.dismiss();

                    chkSubscribe = (CheckBox)findViewById(R.id.chkSubscribe);
                    if (chkSubscribe.isChecked())
                    {
                    Toast.makeText(UploadActivity.this,"You have Subscribed for Newsletter",
                    Toast.LENGTH_LONG).show();
                    }       
                    else {
                    Toast.makeText(UploadActivity.this,"You have Un-subscribed for Newsletter",
                    Toast.LENGTH_LONG).show();
                    }

                }

```

**Error Line:**

```
com.example.UploadActivity$2.onClick(UploadActivity.java:271)

```

**(i.e.):**

```
if (chkSubscribe.isChecked())

```