Array of Buttons in Android

Question

I want to map the buttons to an array of buttons and the code has no errors while compiling but there is force close when i run it: ``` Button buttons[]; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.game_board_view); // Set OnClick listeners Button buttons[] = null; buttons[0] = (Button)findViewById(R.id.buttonOne); buttons[1] = (Button)findViewById(R.id.buttonTwo); buttons[2] = (Button)findViewById(R.id.buttonThree); buttons[3] = (Button)findViewById(R.id.buttonFour); buttons[4] = (Button)findViewById(R.id.buttonFive); buttons[5] = (Button)findViewById(R.id.buttonSix); buttons[6] = (Button)findViewById(R.id.buttonSeven); buttons[7] = (Button)findViewById(R.id.buttonEight); buttons[8] = (Button)findViewById(R.id.buttonMid); } ``` LogCat: ``` 03-26 21:42:51.455: D/dalvikvm(1156): GC_EXTERNAL_ALLOC freed 55K, 53% free 2566K/5379K, external 1625K/2137K, paused 98ms 03-26 21:42:54.323: D/AndroidRuntime(1156): Sh…

Accepted Answer

Your array is null and you're trying to get an index into it. That is what's causing the `NullPointerException`. Your array must be initialized before you can use it to store your buttons.

If you want an array of nine buttons then change this line:

```
Button buttons[] = null; 
```

To this:

```
Button buttons[] = new Button[9];
```

Also, you have a class member `Button buttons[]` and a local function variable that is also named `Button buttons[]`. If this is intentional then by all means carry on. Otherwise, you'll want to further change your line to this:

```
buttons[] = new Button[9];
```

Array of Buttons in Android

Solution

Problem