CODEWITHSUNDEEP
javaandroidxmleclipse
Missy Zewdie
Missy Zewdie

Reputation: 231

Why can't my android application find Text View or Buttons declared in the XML file?

I was following the tutorials online on Android Programming using Eclipse by New Boston and I am stuck at a particular point. So,everything was working fine, I had a button and a TextView in my GUI interface. Now, when i went to my java file and tried to locate it by using the R.Id..... it can't recognize the Button id or TextView Id declared in the XML file. Why am i getting this error? Can someone please correct my mistake. I am using Minimum SDK - API8- Android 2.2 ,Target SDK-API 13-Android 3.2 and Compiling with SDK- API 19- Android 4.4.

I checked the following article on Stack Overflow My Android application cannot find buttons declared in the XML file. As per the solution, I should delete the imports android.R from my java file and i dont have that import at all. So, i am kind of confused.

Main Activity.java

package com.example.androidprogram1;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {
    TextView display;
    Button show;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        show = (Button)findViewById(R.id.button1);
        display = (TextView)findViewById(R.id.textView1);

//Error message:- Create field Button1 in type id (Suggestions) /create Constant TextView1 in type id.....This is the error i get. It seems that the id of the button and textView is not adding to the R.java file

    }

    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/tvView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.androidprogram1.MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="65dp"
        android:layout_toRightOf="@+id/textView1"
        android:text="@string/hello_world" />

</RelativeLayout>

Thanks a lot.!!

Upvotes: 0

Views: 831

Answers (1)

pez
pez

Reputation: 4235

You need to instantiate the TextView and Button

@Override
protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    show = (Button) findViewById(R.id.button1);
    display = (TextView) findViewById(R.id.textView1);
}

Edit: Your error message seems to be an Eclipse problem, rather than something you've done, unless you went in and made changes to R.java, which you shouldn't do. Save your project, close it, re-open and re-build it. Also, if you happen to have import android.R in your class, remove it.

Upvotes: 1

Related Questions