Error checking if Bluetooth is enabled in Android (REQUEST_ENABLE_BT cannot be resolved to a variable)

Question

I'm trying to do this:

    BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
    if (bt == null){
        //Does not support Bluetooth
        status.setText("Your device does not support Bluetooth");
    }else{
        //Magic starts. Let's check if it's enabled
        if (!bt.isEnabled()){
            Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
        }   
    }

But I get this error:

REQUEST_ENABLE_BT cannot be resolved to a variable

How can I fix it?

Answer 1

REQUEST_ENABLE_BT is a request code that you provide. It's really just a number that you provide for onActivityResult. It will be the requestCode (first parameter) of onActivityResult when the activity returns. You could put any number you want as long as it's consistent in the return method.

In other words, put a line like this in the top of your Activity:

private final static int REQUEST_ENABLE_BT = 1;

Answer 2

The document says The REQUEST_ENABLE_BT constant passed to startActivityForResult() is a locally defined integer (which must be greater than 0), that the system passes back to you in your onActivityResult() implementation as the requestCode parameter.

You can pass any integer value > 0 there.

Answer 3

override method startActivityForResult as bellow.

private void startActivityForResult(Intent enableBtIntent,Object rEQUEST_ENABLE_BT2) {
}