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POcant call function from inside thread or asyntask
 

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  1. POcant call function from inside thread or asyntask
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    <p>I am using a thread and a handler in android. The app works fine as long as i dont any function from outside the activity. But if i call some funcyion from outside the activity from inside a thread, it gives NullPointerException.</p> <pre><code>package com.prog; import com.API.TextBoxCheck; import android.app.Activity; import android.app.ProgressDialog; import android.os.Bundle; import android.os.Handler; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class ProgressBarExample extends Activity { private Handler handler = new Handler(); int i; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button btn=(Button)findViewById(R.id.button1); btn.setOnClickListener(new OnClickListener(){ TextView tv=(TextView)findViewById(R.id.textView1); @Override public void onClick(View v) { // TODO Auto-generated method stub Thread thread = new Thread(null, doBackgroundThreadProcessing, "Background"); thread.start(); }}); Button stopBtn=(Button)findViewById(R.id.button2); stopBtn.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub finish(); }}); } private Runnable doBackgroundThreadProcessing = new Runnable() { public void run() { try { backgroundThreadProcessing(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }; private void backgroundThreadProcessing() throws InterruptedException { TextView tv=(TextView)findViewById(R.id.textView1); i=0; while(i&lt;100) { handler.post(doUpdateGUI); Thread.sleep(50); i++; } EditText et=(EditText)findViewById(R.id.editText1); TextBoxCheck tbc = new com.API.TextBoxCheck(); String reply=tbc.TextBoxChecker(et.getText().toString(),10); Log.d("thread", reply); } private Runnable doUpdateGUI = new Runnable() { public void run() { updateGUI(); } private void updateGUI() { // TODO Auto-generated method stub TextView tv=(TextView)findViewById(R.id.textView1); tv.setText(i+"%"); } }; } </code></pre> <p>I have left out the code of textBoxCheck becoz i think it may be unnecesarry here. Please help me on this.</p> <p>PS. : I also tried using AsyncTask but the same problem occurs.</p>
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