Droid Code Fix

[Null Pointer]

I just started developing droif apps, but nothing will display, even though the dev center says IT WILL. can you guys take a look? I know the code may be disgusting.... but if you can help me..

publicvoid onCreate(Bundle savedInstanceState) {
System.out.println("Hallo"); // Things like this were for tests--none fired
super.onCreate(savedInstanceState);
Button button = new Button (this);
button.setText(" Click me! ");
button.setBackgroundColor(8);
button.setWidth(50);
button.setHeight(50);
button.setOnClickListener(new View.OnClickListener() {
publicvoid onClick(View v) {
System.out.println("Here!");
}
});
setContentView(button);

After all that (No errors), I still got only the blank android emulator diplaying "ANDROID". Any suggestions? I'm a newbie to Droid structure..


EDIT: It IS "public void", not "publicvoid"

[Samstag]

You need to define an Activity to get anything to display in Android. Take a look at the hello world tutorial to get started.

[mjones1052]

I don't think publicvoid should be one word should it?

NVM mind saw your edit

[Null Pointer]

That was just some.. Here is all the code:

package

com.steve.personal;

import

android.app.Activity;

import

android.os.Bundle;

import

android.view.View;

import

android.widget.Button;

public

class App1 extends Activity {



publicvoid onCreate(Bundle savedInstanceState) {
System.out.println("Hallo");
super.onCreate(savedInstanceState);
Button button = new Button (this);
button.setText(" Click me! ");
button.setBackgroundColor(8);
button.setWidth(50);
button.setHeight(50);
button.setOnClickListener(new View.OnClickListener() {
publicvoid onClick(View v) {
System.out.println("Here!");
}
});
setContentView(button);


}

}


I just modified the Hello World tutorial (Which also did nothing)

[Samstag]

If the hello world tutorial didn't work, then you've got a problem with your installation. You might want to go through the whole tutorial again and be careful about setting everything up exactly as directed.

[Null Pointer]

Could you try it out and tell me what happens?

[jnev]

you need to create an xml file in res/layout/ that will define the look of your app. you cannot make system calls to print; rather everything you display is created through the xml file. creating a Button object does not automatically display it on the screen. for example, you never call setContentView() to dispaly your activity.

go through some basic android development tutorials and it will show you the layout of an android project.