Unfortunately hello has stopped

Question

1.00/5 (1 vote)

See more:

Hello everyone, I have a problem that is every time I try to run an android code on the emulator an error message appears and i don't know what to do which is Unfortunately hello has stopped (hello is the name of the application) which consists of a button that when clicked a textview is filled with the world hello. the code used is as follows

Java

package com.example.hello;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
    Button btn = (Button) findViewById(R.id.button1);
    TextView tv = (TextView)findViewById(R.id.textView1);
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                tv.setText("Hello Welcome");	
            }
        });
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

The computer is Pentium Dual core 2GB Ram 1.65 usable 32 bit operating System windows 7 and the emulator is Android 4.4 Api Level 19 512 Ram 16 heap and 200 internal storage

Posted 6-Apr-14 9:24am

eng_sammy

Updated 6-Apr-14 10:18am

Maarten Kools

v2

Add a Solution

Comments

Peter Leow 6-Apr-14 22:08pm

You should show your menu xml in your question using the improve question widget.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Peter Leow · Accepted Answer · 2014-04-06T19:02:00

Solution 1

You have to place the btn and tv initialization after the setContentView inside the onCreate
also to add final to the tv as you are using it in an inner class

setContentView(R.layout.activity_main);
		
Button btn = (Button) findViewById(R.id.button1);
final TextView tv = (TextView)findViewById(R.id.textView1);

The End.

Posted 6-Apr-14 19:02pm

Peter Leow

v2

Comments

eng_sammy 7-Apr-14 4:01am

Thank you very much it worked