Hi, I have a custom Dialog on my app and I have a problem to do what I would like.

I explain. My Dialog have had 4 Buttons. (Back, Valid, Modify and Restore)

When user click on Modify or Valid I would like to call another activity. So I use Intent but it crash.

The error Log :

05-19 13:29:21.495: ERROR/DEBUGTAG(974): java.lang.NullPointerException 05-19 13:29:21.495: ERROR/DEBUGTAG(974):
at android.content.ComponentName.(ComponentName.java:75) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.content.Intent.(Intent.java:2551) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at com.android.booztermobile.activity.HeaderMailDisplayActivity.onClick(HeaderMailDisplayActivity.java:571) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.View.performClick(View.java:2364) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.View.onTouchEvent(View.java:4179) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.widget.TextView.onTouchEvent(TextView.java:6540) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.View.dispatchTouchEvent(View.java:3709) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.app.Dialog.dispatchTouchEvent(Dialog.java:643) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.os.Handler.dispatchMessage(Handler.java:99) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.os.Looper.loop(Looper.java:123) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at android.app.ActivityThread.main(ActivityThread.java:4363) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at java.lang.reflect.Method.invokeNative(Native Method) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at java.lang.reflect.Method.invoke(Method.java:521) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 05-19 13:29:21.495: ERROR/DEBUGTAG(974): at dalvik.system.NativeStart.main(Native Method)

My custom Dialog :

package com.android.booztermobile.services;

import com.android.booztermobile.R;

import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;


public class MailDialog extends Dialog {

    private Button btnValid;
    private Button btnBack;
    private Button btnRestore;
    private Button btnModify;
    private Context context;


    public MailDialog(Context cont) {
        super(cont);
        context = cont;
        }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d("TestApp", "Dialog created");
            setContentView(R.layout.dialog_classement);     

            btnValid = (Button) findViewById(R.id.btnValidClassement);
            btnBack = (Button) findViewById(R.id.btnBackClassement);    
            btnRestore = (Button) findViewById(R.id.btnRestoreClassement);
            btnModify = (Button) findViewById(R.id.btnModifyClassement);

    }
}

and the activity (cut because too long):

        //create dialog
 public void getMailInformations(View v, Context context){

  currentMail = (MailHeader) v.getTag();

  dial = new MailDialog(context);

  dial.setTitle("Classement");
  dial.show();

  btnValidClassement = (Button) dial.findViewById(R.id.btnValidClassement);
  btnValidClassement.setOnClickListener(this);

 }

/** the Onclick : */

public void onClick(View view) {

    if(view == btnValidClassement){

   try{

    ClassementHandlerCall classement = new               ClassementHandlerCall();
       boolean mailClassify = classement.classifyMail(AuthentificationActivity.uidh, 
         String.valueOf(currentMail.getSeqnum()), null, null);

       dial.dismiss();

       if (mailClassify == true){

        // create Intent
        Intent defineIntentDisplayPreviousMails = new Intent(HeaderMailDisplayActivity.this, ClassementActivity.class);


       }

   }catch(Exception e){
    // TODO Auto-generated catch block
    Log.e("DEBUGTAG","Error occured", e);
    e.printStackTrace();
   }



  }

}