How to use com.jme3.system

/**
 * Displays an error message to the user in whichever way the context
 * feels is appropriate. If this is a headless or an offscreen surface
 * context, this method should do nothing.
 *
 * @param message The error message to display. May contain new line
 * characters.
 */
public static void showErrorDialog(String message){
  checkDelegate();
  systemDelegate.showErrorDialog(message);
}

  @Override
  public void invoke(final long window, final int width, final int height) {
    settings.setResolution(width, height);
    listener.reshape(width, height);
  }
});

/**
 * Displays or hides the onscreen soft keyboard
 * @param show If true, the keyboard is displayed, if false, the screen is hidden.
 */
public static void showSoftKeyboard(boolean show) {
  checkDelegate();
  systemDelegate.showSoftKeyboard(show);
}

public void setSettings(AppSettings settings) {
  this.settings.copyFrom(settings);
  this.settings.setRenderer(AppSettings.LWJGL_OPENGL2);
  if (actualContext != null){
    actualContext.setSettings(settings);
  }
}

  @Override
  public void invoke(final long window, final boolean focus) {
    if (wasActive != focus) {
      if (!wasActive) {
        listener.gainFocus();
        timer.reset();
      } else {
        listener.loseFocus();
      }
      wasActive = !wasActive;
    }
  }
});

public static AssetManager newAssetManager() {
  checkDelegate();
  return systemDelegate.newAssetManager();
}

public static boolean isLowPermissions() {
  checkDelegate();
  return systemDelegate.isLowPermissions();
}

public static boolean showSettingsDialog(AppSettings sourceSettings, final boolean loadFromRegistry) {
  checkDelegate();
  return systemDelegate.showSettingsDialog(sourceSettings, loadFromRegistry);
}

public static String getFullName() {
  checkDelegate();
  return systemDelegate.getFullName();
}

public static AudioRenderer newAudioRenderer(AppSettings settings) {
  checkDelegate();
  return systemDelegate.newAudioRenderer(settings);
}

public static void initialize(AppSettings settings) {
  checkDelegate();
  systemDelegate.initialize(settings);
}

public static URL getResource(String name) {
  checkDelegate();
  return systemDelegate.getResource(name);
}

public static InputStream getResourceAsStream(String name) {
  checkDelegate();
  return systemDelegate.getResourceAsStream(name);
}

public static Platform getPlatform() {
  checkDelegate();
  return systemDelegate.getPlatform();
}

public static SoftTextDialogInput getSoftTextDialogInput() {
  checkDelegate();
  return systemDelegate.getSoftTextDialogInput();
}

public static synchronized File getStorageFolder(StorageFolderType type) {
  checkDelegate();
  return systemDelegate.getStorageFolder(type);
}

public static URL getPlatformAssetConfigURL() {
  checkDelegate();
  return systemDelegate.getPlatformAssetConfigURL();
}
 

public static boolean trackDirectMemory() {
  checkDelegate();
  return systemDelegate.trackDirectMemory();
}

  @Override
  public void invoke(final long window, final int width, final int height) {
    settings.setResolution(width, height);
    listener.reshape(width, height);
  }
});

public static AssetManager newAssetManager(URL configFile) {
  checkDelegate();
  return systemDelegate.newAssetManager(configFile);
}