Thanks for the suggestions San and Fllip. I have tried the example
that San gave but still errors. Here's the revised code in the
main.xml file:
package com.HelloWorld;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class Hello extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// start code here
tv = (TextView) findViewById(R.id.TextView01);
tv.setText("This is sample.");
Button button = (Button) findViewById(R.id.Button01);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(Hello.this, "Hello World",
Toast.LENGTH_SHORT).show();
tv.setText("Button Clicked");
}
});
}
}
Errors are:
for the line: tv = (TextView) findViewById(R.id.TextView01);
-------- tv can not be resolved to a variable
for the line: tv.setText("This is sample."); -------- tv can not be
resolved
for the line: tv.setText("Button Clicked"); -------- tv can not be
resolved
Any ideas why the errors?
On Aug 31, 4:56 pm, San <[email protected]> wrote:
> As Havlicek said, create thetextviewusing findViewByID and set the
> text when button is clicked.
>
> Sample code:
>
> tv = (TextView) findViewById(R.id.TextView01);
> tv.setText("This is sample.");
> Button button = (Button) findViewById(R.id.Button01);
> button.setOnClickListener(new OnClickListener() {
> public void onClick(View v) {
> tv.setText("Button Clicked");
>
> }
> });
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