AndEngine Example(2):RectangleExample

目标：

1.場景截屏對象 ScreenCapture ,

2.場景截屏回調接口IScreenCaptureCallback 

3.場景截屏回調方法 onScreenCaptured / onScreenCaptureFailed

4.場景點選事件 

5.了解如何建立實體:組(group)

package org.andengine.examples;

import org.andengine.engine.camera.Camera;
import org.andengine.engine.options.EngineOptions;
import org.andengine.engine.options.ScreenOrientation;
import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
import org.andengine.entity.Entity;
import org.andengine.entity.primitive.Rectangle;
import org.andengine.entity.scene.IOnSceneTouchListener;
import org.andengine.entity.scene.Scene;
import org.andengine.entity.scene.background.Background;
import org.andengine.entity.util.FPSLogger;
import org.andengine.entity.util.ScreenCapture;
import org.andengine.entity.util.ScreenCapture.IScreenCaptureCallback;
import org.andengine.input.touch.TouchEvent;
import org.andengine.ui.activity.SimpleBaseGameActivity;
import org.andengine.util.FileUtils;

import android.widget.Toast;

/**
 * (c) 2010 Nicolas Gramlich 
 * (c) 2011 Zynga Inc.
 * 
 * @author Nicolas Gramlich
 * @since 11:54:51 - 03.04.2010
 */
public class RectangleExample extends SimpleBaseGameActivity {
	// ===========================================================
	// Constants
	// ===========================================================

	private static final int CAMERA_WIDTH = 720;
	private static final int CAMERA_HEIGHT = 480;

	// ===========================================================
	// Fields
	// ===========================================================

	// ===========================================================
	// Constructors
	// ===========================================================

	// ===========================================================
	// Getter & Setter
	// ===========================================================

	// ===========================================================
	// Methods for/from SuperClass/Interfaces
	// ===========================================================

	@Override
	public EngineOptions onCreateEngineOptions() {
		final Camera camera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

		return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), camera);
	}

	@Override
	public void onCreateResources() {

	}

	@Override
	public Scene onCreateScene() {
		this.mEngine.registerUpdateHandler(new FPSLogger());

		final Scene scene = new Scene();
		final ScreenCapture screenCapture = new ScreenCapture();
		scene.attachChild(screenCapture);
		scene.setOnSceneTouchListener(new IOnSceneTouchListener() {
			@Override
			public boolean onSceneTouchEvent(final Scene pScene, final TouchEvent pSceneTouchEvent) {
				if(pSceneTouchEvent.isActionDown()) {
					screenCapture.capture(180, 60, 360, 360, FileUtils.getAbsolutePathOnExternalStorage(RectangleExample.this, "Screen_" + System.currentTimeMillis() + ".png"), new IScreenCaptureCallback() {
						@Override
						public void onScreenCaptured(final String pFilePath) {
							RectangleExample.this.runOnUiThread(new Runnable() {
								@Override
								public void run() {
									Toast.makeText(RectangleExample.this, "Screenshot: " + pFilePath + " taken!", Toast.LENGTH_SHORT).show();
								}
							});
						}

						@Override
						public void onScreenCaptureFailed(final String pFilePath, final Exception pException) {
							RectangleExample.this.runOnUiThread(new Runnable() {
								@Override
								public void run() {
									Toast.makeText(RectangleExample.this, "FAILED capturing Screenshot: " + pFilePath + " !", Toast.LENGTH_SHORT).show();
								}
							});
						}
					});
				}
				return true;
			}
		});

		scene.setBackground(new Background(0, 0, 0));

		/* Create the rectangles. */
		final Rectangle rect1 = this.makeColoredRectangle(-180, -180, 1, 0, 0);
		final Rectangle rect2 = this.makeColoredRectangle(0, -180, 0, 1, 0);
		final Rectangle rect3 = this.makeColoredRectangle(0, 0, 0, 0, 1);
		final Rectangle rect4 = this.makeColoredRectangle(-180, 0, 1, 1, 0);

		final Entity rectangleGroup = new Entity(CAMERA_WIDTH / 2, CAMERA_HEIGHT / 2);

		rectangleGroup.attachChild(rect1);
		rectangleGroup.attachChild(rect2);
		rectangleGroup.attachChild(rect3);
		rectangleGroup.attachChild(rect4);

		scene.attachChild(rectangleGroup);

		return scene;
	}

	private Rectangle makeColoredRectangle(final float pX, final float pY, final float pRed, final float pGreen, final float pBlue) {
		final Rectangle coloredRect = new Rectangle(pX, pY, 180, 180, this.getVertexBufferObjectManager());
		coloredRect.setColor(pRed, pGreen, pBlue);
		return coloredRect;
	}

	// ===========================================================
	// Methods
	// ===========================================================

	// ===========================================================
	// Inner and Anonymous Classes
	// ===========================================================
}
           

這篇介紹了觸摸事件，這個可能會要經常用到。

但是螢幕截取這個功能可能不常用，是以就不介紹了。