Question

In this method I return a value of the type Double, but there is an error saying “Method

Must return value of type Double”???

Code:

public class Gyro extends Activity {

Double gyro_X;
Double gyro_Y;
Double gyro_Z;

public Double getGyro_X() {
    if (this.gyro_X == null) {
        Toast.makeText(this, ""+gyro_XIsNullText, ToastdurationShort).show();
    } else { 
    return this.gyro_X;
    }
}

Answer 1

If this.gyro_x is null you don’t return anything…
Your code should be something like

public Double getGyro_X() {
    if (this.gyro_X == null) {
        Toast.makeText(this, ""+gyro_XIsNullText, ToastdurationShort).show();
        return null;
        //Or maybe: throw new NullPointerException();
    } else { 
    return this.gyro_X;
    }
}