GameScreen.java

package com.arretadogames.pilot.screens;

import com.arretadogames.pilot.MainActivity;
import com.arretadogames.pilot.render.opengl.GLCanvas;

/**
 * GameScreen class represents a Screen in the Game<br>
 * It has all operations that support a screen
 */
public abstract class GameScreen {
    // For now this class is abstract because we are going to add some
    // Common content for all of them in the future...

    /**
     * Gets a dimension from the resources
     *
     * @param resId The resource id
     * @return Dimension
     */
    public float getDimension(int resId) {
        return MainActivity.getContext().getResources().getDimension(resId);
    }

    /**
     * Gets a string from resources
     *
     * @param resId The resource id
     * @return String
     */
    public String getString(int resId) {
        return MainActivity.getContext().getString(resId);
    }

    /**
     * Renders the Screen
     *
     * @param gl GL Interface to Draw
     * @param timeElapsed Time Elapsed from last frame
     */
    public abstract void render(GLCanvas canvas, float timeElapsed);

    /**
     * Performs a Step in the Screen's logic
     *
     * @param timeElapsed Time Elapsed from last frame
     */
    public abstract void step(float timeElapsed);

    /**
     * Handles the input into the Screen
     *
     * @param event MotionEvent / Input Event to be handled
     */
    public abstract void input(InputEventHandler event);

    /**
     * Handles the pause event, when the user receives a call or locks the
     * screen
     */
    public abstract void onPause();

    // Asynchronous method. Called when the screen should be unloaded
    public void onLoading() {
        // TODO Auto-generated method stub
    }

    // Asynchronous method. Called when the screen should unloaded
    public void onUnloading() {
        // TODO Auto-generated method stub
    }

    /**
     * Handles the physical back button
     */
    public void onBackPressed() {
    }

}