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POThe value of a variable in one class is recieved as null in another when called in java
 

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  1. POThe value of a variable in one class is recieved as null in another when called in java
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    <p>I want to use the value of a string variable in one class into another...</p> <p>But when i do so by creating an object in the calling class of the called class, i get the value as null.</p> <p>I tried searching on the net and stack overflow and went through some similar answers,but the solutions to them were specific to those questions.So m asking again.</p> <p>here are the 2 classes -</p> <p>1st one is the class from which i want to use the variable. class is - SelectedClass variable i want to use in another class - SelectedClass( a string)</p> <p>2nd class is FEa.I want to use the value of the variable "SelectedClass" from the 1st class.</p> <p>CLASS 1(SelectedClass)-</p> <pre><code>package com.attendance_trial.nirmik; import android.app.ListActivity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Toast; public class SelectClass extends ListActivity { public String classes2[] = {"FEa","FEb","SEa","SEb"}; String SelectedClass; @Override public void onListItemClick(ListView l, View v, int position, long id) { // TODO Auto-generated method stub super.onListItemClick(l, v, position, id); String SelectedClass = classes2[position]; try { Class MyClass = Class.forName("com.attendance_trial.nirmik." + SelectedClass); Intent myintent = new Intent(SelectClass.this,MyClass); startActivity(myintent); } catch(ClassNotFoundException cnf) { cnf.printStackTrace(); } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // TODO Auto-generated method stub setListAdapter(new ArrayAdapter&lt;String&gt;(SelectClass.this, android.R.layout.simple_list_item_1, classes2)); } </code></pre> <p>}</p> <p>CLASS 2 (FEa) -</p> <pre><code>package com.attendance_trial.nirmik; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class FEa extends Activity implements View.OnClickListener { SelectClass sc = new SelectClass(); //Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,bSend; Button bSend; TextView tvDisp; String acc=""; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.fea); initialise(); } private void initialise()//initialise all buttons etc { bSend = (Button) findViewById (R.id.BtnSendMsg); bSend.setOnClickListener(this); tvDisp=(TextView) findViewById (R.id.TxtViewDisplay); } public void onButtonClick(View v) { // TODO Auto-generated method stub Button theButton = (Button)v; String chk = theButton.getText().toString(); if(chk.contentEquals("1")||chk.contentEquals("2")||chk.contentEquals("3")||chk.contentEquals("4")||chk.contentEquals("5") ||chk.contentEquals("6")||chk.contentEquals("7")||chk.contentEquals("8")||chk.contentEquals("9")) { acc = acc + "0" + chk; } else { acc = acc +chk; } tvDisp.setText("String Is:" + acc); }//method end @Override public void onClick(View v2) { // TODO Auto-generated method stub int retid = v2.getId(); if(retid == R.id.BtnSendMsg ) //send button clicked { String msg = sc.SelectedClass + "2210"+ acc; Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND); emailIntent.setType("plain/text"); emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, msg); startActivity(emailIntent); } } </code></pre> <p>}//main end</p>
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    1. USmah
    1. USNirmik
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    1. PO
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    2. PO
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      1. POThe value of a variable in one class is recieved as null in another when called in java
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    2. VO
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    1. COyour question has nothing to do with android. First form a relevant short example.
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      1. POThe value of a variable in one class is recieved as null in another when called in java
      1. USNarendra Pathai
    2. COinitialization error dude , the class being accessed here must be initialised
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      1. USHussain Akhtar Wahid 'Ghouri'
    3. CO@NarendraPathai ...thats a code from an android app m making as trial! how can u say its not?
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      1. USNirmik
 

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