Hello, community. I'm a fresh, brand new developer hoping to jump
straight into application development, specifically for a personal
project of mine. I have no idea what I'm doing, but I'm a fast learner
and self-motivated into researching everything I need to know. The
problem I'm experiencing on this note is the fact that I have no clue
about what I should be looking for, reading, or seeing in the way of
sources on the topic. I've built a basic application with a single
button that closes the application cleanly, and nothing else. Now I
want that button to cause the phone to vibrate for 2000ms, to get a
feel for calling various classes within my application.
Here's what I've written so far in the .java:
package com.example.helloformstuff;
import android.app.Activity;
import android.os.*;
import android.os.Vibrator;
import android.widget.Button;
import android.view.View;
public class HelloFormStuff extends Activity {
/** Called when the activity is first created. */
Vibrator vib;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
long milliseconds = 2000;
vib.vibrate(milliseconds);
}
});
}
}
--------------------
Layout XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello, I am a TextView"
/>
<Button android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Vibrate"
android:onClick="viBrate"
/>
</LinearLayout>
--------------------
The application opens, but the button causes a null exception and
force-closes the application. Any ideas on tutorials or examples I can
look at? Or maybe someone could tell me exactly what's wrong, why, and
how I can fix it?
- A new dev, WhiteWolf128
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