AndEngine学习笔记--2--自定义button

其实自定义button很简单,AndEngine不是开源的吗？ 对，既然是开源的，当然看源码才是王道，理解了作者的实现原理，写自己的自然就容易多了。

我属于比较菜，又兼比较懒得类型，所以就直接打开源码copy了，下面是直接贴出的源码。

public class ButtonSprite extends TiledSprite {// ===========================================================// Constants// ===========================================================// ===========================================================// Fields// ===========================================================private final int mStateCount;private OnClickListener mOnClickListener;private boolean mEnabled = true;private State mState;// ===========================================================// Constructors// ===========================================================public ButtonSprite(final float pX, final float pY, final ITextureRegion pNormalTextureRegion, final VertexBufferObjectManager pVertexBufferObjectManager) {this(pX, pY, pNormalTextureRegion, pVertexBufferObjectManager, (OnClickListener) null);}public ButtonSprite(final float pX, final float pY, final ITextureRegion pNormalTextureRegion, final VertexBufferObjectManager pVertexBufferObjectManager, final OnClickListener pOnClickListener) {this(pX, pY, new TiledTextureRegion(pNormalTextureRegion.getTexture(), pNormalTextureRegion), pVertexBufferObjectManager, pOnClickListener);}public ButtonSprite(final float pX, final float pY, final ITextureRegion pNormalTextureRegion, final ITextureRegion pPressedTextureRegion, final VertexBufferObjectManager pVertexBufferObjectManager) {this(pX, pY, pNormalTextureRegion, pPressedTextureRegion, pVertexBufferObjectManager, (OnClickListener) null);}public ButtonSprite(final float pX, final float pY, final ITextureRegion pNormalTextureRegion, final ITextureRegion pPressedTextureRegion, final VertexBufferObjectManager pVertexBufferObjectManager, final OnClickListener pOnClickListener) {this(pX, pY, new TiledTextureRegion(pNormalTextureRegion.getTexture(), pNormalTextureRegion, pPressedTextureRegion), pVertexBufferObjectManager, pOnClickListener);}public ButtonSprite(final float pX, final float pY, final ITextureRegion pNormalTextureRegion, final ITextureRegion pPressedTextureRegion, final ITextureRegion pDisabledTextureRegion, final VertexBufferObjectManager pVertexBufferObjectManager) {this(pX, pY, pNormalTextureRegion, pPressedTextureRegion, pDisabledTextureRegion, pVertexBufferObjectManager, (OnClickListener) null);}public ButtonSprite(final float pX, final float pY, final ITextureRegion pNormalTextureRegion, final ITextureRegion pPressedTextureRegion, final ITextureRegion pDisabledTextureRegion, final VertexBufferObjectManager pVertexBufferObjectManager, final OnClickListener pOnClickListener) {this(pX, pY, new TiledTextureRegion(pNormalTextureRegion.getTexture(), pNormalTextureRegion, pPressedTextureRegion, pDisabledTextureRegion), pVertexBufferObjectManager, pOnClickListener);}public ButtonSprite(final float pX, final float pY, final ITiledTextureRegion pTiledTextureRegion, final VertexBufferObjectManager pVertexBufferObjectManager) {this(pX, pY, pTiledTextureRegion, pVertexBufferObjectManager, (OnClickListener) null);}public ButtonSprite(final float pX, final float pY, final ITiledTextureRegion pTiledTextureRegion, final VertexBufferObjectManager pVertexBufferObjectManager, final OnClickListener pOnClickListener) {super(pX, pY, pTiledTextureRegion, pVertexBufferObjectManager);this.mOnClickListener = pOnClickListener;this.mStateCount = pTiledTextureRegion.getTileCount();switch(this.mStateCount) {case 1:Debug.w("No " + ITextureRegion.class.getSimpleName() + " supplied for " + State.class.getSimpleName() + "." + State.PRESSED + ".");case 2:Debug.w("No " + ITextureRegion.class.getSimpleName() + " supplied for " + State.class.getSimpleName() + "." + State.DISABLED + ".");break;case 3:break;default:throw new IllegalArgumentException("The supplied " + ITiledTextureRegion.class.getSimpleName() + " has an unexpected amount of states: '" + this.mStateCount + "'.");}this.changeState(State.NORMAL);}// ===========================================================// Getter & Setter// ===========================================================public boolean isEnabled() {return this.mEnabled;}public void setEnabled(final boolean pEnabled) {this.mEnabled = pEnabled;if(this.mEnabled && this.mState == State.DISABLED) {this.changeState(State.NORMAL);} else if(!this.mEnabled) {this.changeState(State.DISABLED);}}public boolean isPressed() {return this.mState == State.PRESSED;}public State getState() {return this.mState;}public void setOnClickListener(final OnClickListener pOnClickListener) {this.mOnClickListener = pOnClickListener;}// ===========================================================// Methods for/from SuperClass/Interfaces// ===========================================================@Overridepublic boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {if(!this.isEnabled()) {this.changeState(State.DISABLED);} else if(pSceneTouchEvent.isActionDown()) {this.changeState(State.PRESSED);} else if(pSceneTouchEvent.isActionCancel() || !this.contains(pSceneTouchEvent.getX(), pSceneTouchEvent.getY())) {this.changeState(State.NORMAL);} else if(pSceneTouchEvent.isActionUp() && this.mState == State.PRESSED) {this.changeState(State.NORMAL);if(this.mOnClickListener != null) {this.mOnClickListener.onClick(this, pTouchAreaLocalX, pTouchAreaLocalY);}}return true;}@Overridepublic boolean contains(final float pX, final float pY) {if(!this.isVisible()) {return false;} else {return super.contains(pX, pY);}}// ===========================================================// Methods// ===========================================================private void changeState(final State pState) {if(pState == this.mState) {return;}this.mState = pState;final int stateTiledTextureRegionIndex = this.mState.getTiledTextureRegionIndex();if(stateTiledTextureRegionIndex >= this.mStateCount) {this.setCurrentTileIndex(0);Debug.w(this.getClass().getSimpleName() + " changed its " + State.class.getSimpleName() + " to " + pState.toString() + ", which doesn't have a " + ITextureRegion.class.getSimpleName() + " supplied. Applying default " + ITextureRegion.class.getSimpleName() + ".");} else {this.setCurrentTileIndex(stateTiledTextureRegionIndex);}}// ===========================================================// Inner and Anonymous Classes// ===========================================================public interface OnClickListener {// ===========================================================// Constants// ===========================================================// ===========================================================// Methods// ===========================================================public void onClick(final ButtonSprite pButtonSprite, final float pTouchAreaLocalX, final float pTouchAreaLocalY);}public static enum State {// ===========================================================// Elements// ===========================================================NORMAL(0),PRESSED(1),DISABLED(2);// ===========================================================// Constants// ===========================================================// ===========================================================// Fields// ===========================================================private final int mTiledTextureRegionIndex;// ===========================================================// Constructors// ===========================================================private State(final int pTiledTextureRegionIndex) {this.mTiledTextureRegionIndex = pTiledTextureRegionIndex;}// ===========================================================// Getter & Setter// ===========================================================public int getTiledTextureRegionIndex() {return this.mTiledTextureRegionIndex;}// ===========================================================// Methods for/from SuperClass/Interfaces// ===========================================================// ===========================================================// Methods// ===========================================================// ===========================================================// Inner and Anonymous Classes// ===========================================================}}

看看源码，其实按钮就是精灵而已，自定义button很容易，只需要按照源码中的touch的监听方式，复制一遍，改一点就好了。这里写一个我感觉最实用的透明按钮。当然不能和源码一样继承TiledSprite。这里我选择了继承Rectangle，下面上代码：

public class RectButton extends Rectangle{private OnRectClickListener mOnClickListener;private boolean mEnabled = true;private State mState;public RectButton(float pX, float pY,float width,float height,VertexBufferObjectManager pVertexBufferObjectManager) {super(pX, pY, width, height, pVertexBufferObjectManager);this.setAlpha(0);}public boolean isEnabled() {return this.mEnabled;}public void setEnabled(final boolean pEnabled) {this.mEnabled = pEnabled;if(this.mEnabled && this.mState == State.DISABLED) {this.changeState(State.NORMAL);} else if(!this.mEnabled) {this.changeState(State.DISABLED);}}public boolean isPressed() {return this.mState == State.PRESSED;}public State getState() {return this.mState;}public void setOnRectClickListener(final OnRectClickListener pOnClickListener) {this.mOnClickListener = pOnClickListener;}@Overridepublic boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {if(!this.isEnabled()) {this.changeState(State.DISABLED);} else if(pSceneTouchEvent.isActionDown()) {this.changeState(State.PRESSED);} else if(pSceneTouchEvent.isActionCancel() || !this.contains(pSceneTouchEvent.getX(), pSceneTouchEvent.getY())) {this.changeState(State.NORMAL);} else if(pSceneTouchEvent.isActionUp() && this.mState == State.PRESSED) {this.changeState(State.NORMAL);if(this.mOnClickListener != null) {this.mOnClickListener.onClick(this, pTouchAreaLocalX, pTouchAreaLocalY);}}return true;}@Overridepublic boolean contains(final float pX, final float pY) {if(!this.isVisible()) {return false;} else {return super.contains(pX, pY);}}private void changeState(final State pState) {if(pState == this.mState) {return;}this.mState = pState;if(this.mState == State.NORMAL){}else if(this.mState == State.PRESSED){}else if(this.mState == State.DISABLED){}}public interface OnRectClickListener {public void onClick(final RectButton pRectButton, final float pTouchAreaLocalX, final float pTouchAreaLocalY);}public static enum State {NORMAL(0),PRESSED(1),DISABLED(2);private final int mTiledTextureRegionIndex;private State(final int pTiledTextureRegionIndex) {this.mTiledTextureRegionIndex = pTiledTextureRegionIndex;}public int getTiledTextureRegionIndex() {return this.mTiledTextureRegionIndex;}}}

用法和ButtonSprite一样，当然还可以添加个文字什么的变成文字按钮，添加个图片什么的就是图片按钮了。文笔不好，只能纯贴代码了。恩，就这样了。