Android TV开发:实现3D仿Gallery效果的实例代码

public class Image3DSwitchView extends LinearLayout {  private int currentPage =0;//定义当前第几页  /**  * 图片左右两边的空白间距  */  public static final int IMAGE_PADDING = 5;  private static final int TOUCH_STATE_REST = 0;  private static final int TOUCH_STATE_SCROLLING = 1;  /**  * 滚动到下一张图片的速度  */  private static final int SNAP_VELOCITY = 600;   /**  * 表示滚动到下一张图片这个动作  */  private static final int SCROLL_NEXT = 0;  /**  * 表示滚动到上一张图片这个动作  */  private static final int SCROLL_PREVIOUS = 1;  /**  * 表示滚动回原图片这个动作  */  private static final int SCROLL_BACK = 2;  private static Handler handler = new Handler();  /**  * 控件宽度  */  public static int mWidth;  private VelocityTracker mVelocityTracker;//主要用跟踪触摸屏事件(flinging事件和其他gestures手势事件)的速率  private Scroller mScroller;  /**  * 图片滚动监听器，当图片发生滚动时回调这个接口  */  private OnImageSwitchListener mListener;  /**  * 记录当前的触摸状态  */  private int mTouchState = TOUCH_STATE_REST;  /**  * 记录被判定为滚动运动的最小滚动值  */  private int mTouchSlop;  /**  * 记录控件高度  */  private int mHeight;  /**  * 记录每张图片的宽度  */  private int mImageWidth;  /**  * 记录图片的总数量  */  private int mCount;  /**  * 记录当前显示图片的坐标  */  private int mCurrentImage;  /**  * 记录上次触摸的横坐标值  */  private float mLastMotionX;  /**  * 是否强制重新布局  */  private boolean forceToRelayout;  private int[] mItems;  public Image3DSwitchView(Context context, AttributeSet attrs) {  super(context, attrs);  mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();  mScroller = new Scroller(context);  //设置可以获得焦点  setFocusable(true);  }  @Override  protected void onLayout(boolean changed, int l, int t, int r, int b) {  if (changed || forceToRelayout) {  mCount = getChildCount();  // 图片数量必须大于5，不然无法正常显示  if (mCount < 5) {  return;  }  mWidth = getMeasuredWidth();  mHeight = getMeasuredHeight();  // 每张图片的宽度设定为控件宽度的百分之六十  mImageWidth = (int) (mWidth * 0.6);  if (mCurrentImage >= 0 && mCurrentImage < mCount) {  mScroller.abortAnimation();  setScrollX(0);  int left = -mImageWidth * 2 + (mWidth - mImageWidth) / 2;  // 分别获取每个位置上应该显示的图片下标  int[] items = {getIndexForItem(1), getIndexForItem(2),  getIndexForItem(3), getIndexForItem(4),  getIndexForItem(5)};  mItems = items;  // 通过循环为每张图片设定位置  for (int i = 0; i < items.length; i++) {  Image3DView childView = (Image3DView) getChildAt(items[i]);  childView.layout(left + IMAGE_PADDING, 0, left  + mImageWidth - IMAGE_PADDING, mHeight);  childView.initImageViewBitmap();  left = left + mImageWidth;  }  refreshImageShowing();  }  forceToRelayout = false;  }  }  public interface OnFocusListener{  void onFocus();  void setValue(String value);  }  private OnFocusListener onFocusListener;  public void setonFocusListener(OnFocusListener onFocusListener){  this.onFocusListener = onFocusListener;  }  @Override  public boolean dispatchKeyEvent(KeyEvent event) {  if (event.getAction() == KeyEvent.ACTION_DOWN){  switch (event.getKeyCode()){  //按下键 响应回调  case KeyEvent.KEYCODE_DPAD_DOWN:  if (onFocusListener != null){onFocusListener.onFocus();}  break;  //按确定键  case KeyEvent.KEYCODE_DPAD_CENTER:  Toast.makeText(getContext(),"点击了图片"+(currentPage%7+1),Toast.LENGTH_SHORT).show();  break;  //右键  case KeyEvent.KEYCODE_DPAD_RIGHT:  scrollToNext();  if (onFocusListener !=null){  onFocusListener.setValue((currentPage%7+1)+"");  }  break;  //左键  case KeyEvent.KEYCODE_DPAD_LEFT:  scrollToPrevious();  if (onFocusListener !=null){  onFocusListener.setValue((currentPage%7+1)+"");  }  break;  }  }  return true;  }  @Override  public boolean onTouchEvent(MotionEvent event) {  if (mScroller.isFinished()) {  if (mVelocityTracker == null) {  mVelocityTracker = VelocityTracker.obtain();  }  mVelocityTracker.addMovement(event);  int action = event.getAction();  float x = event.getX();  switch (action) {  case MotionEvent.ACTION_DOWN:  // 记录按下时的横坐标  mLastMotionX = x;  break;  case MotionEvent.ACTION_MOVE:  int disX = (int) (mLastMotionX - x);  mLastMotionX = x;  scrollBy(disX, 0);  // 当发生移动时刷新图片的显示状态  refreshImageShowing();  break;  case MotionEvent.ACTION_UP:  mVelocityTracker.computeCurrentVelocity(1000);  int velocityX = (int) mVelocityTracker.getXVelocity();  if (shouldScrollToNext(velocityX)) {  // 滚动到下一张图  scrollToNext();  } else if (shouldScrollToPrevious(velocityX)) {  // 滚动到上一张图  scrollToPrevious();  } else {  // 滚动回当前图片  scrollBack();  }  if (mVelocityTracker != null) {  mVelocityTracker.recycle();  mVelocityTracker = null;  }  break;  }  }  return true;  }  /**  * 根据当前的触摸状态来决定是否屏蔽子控件的交互能力。  */  @Override  public boolean onInterceptTouchEvent(MotionEvent ev) {  int action = ev.getAction();  if ((action == MotionEvent.ACTION_MOVE)  && (mTouchState != TOUCH_STATE_REST)) {  return true;  }  float x = ev.getX();  switch (action) {  case MotionEvent.ACTION_DOWN:  mLastMotionX = x;  mTouchState = TOUCH_STATE_REST;  break;  case MotionEvent.ACTION_MOVE:  int xDiff = (int) Math.abs(mLastMotionX - x);  if (xDiff > mTouchSlop) {  mTouchState = TOUCH_STATE_SCROLLING;  }  break;  case MotionEvent.ACTION_UP:  default:  mTouchState = TOUCH_STATE_REST;  break;  }  return mTouchState != TOUCH_STATE_REST;  }  @Override  public void computeScroll() {  if (mScroller.computeScrollOffset()) {  scrollTo(mScroller.getCurrX(), mScroller.getCurrY());  refreshImageShowing();  postInvalidate();  }  }  /**  * 设置图片滚动的监听器，每当有图片滚动时会回调此接口。  *  * @param listener 图片滚动监听器  */  public void setOnImageSwitchListener(OnImageSwitchListener listener) {  mListener = listener;  }  /**  * 设置当前显示图片的下标，注意如果该值小于零或大于等于图片的总数量，图片则无法正常显示。  *  * @param currentImage 图片的下标  */  public void setCurrentImage(int currentImage) {  mCurrentImage = currentImage;  requestLayout();  }  /**  * 滚动到下一张图片。  */  public void scrollToNext() {  if (mScroller.isFinished()) {  currentPage++;  int disX = mImageWidth - getScrollX();  checkImageSwitchBorder(SCROLL_NEXT);  if (mListener != null) {  mListener.onImageSwitch(mCurrentImage);  }  beginScroll(getScrollX(), 0, disX, 0, SCROLL_NEXT);  }  }  /**  * 滚动到上一张图片。  */  public void scrollToPrevious() {  if (mScroller.isFinished()) {  if (currentPage ==0){  currentPage = 7;  }else  currentPage--;  int disX = -mImageWidth - getScrollX();  checkImageSwitchBorder(SCROLL_PREVIOUS);  if (mListener != null) {  mListener.onImageSwitch(mCurrentImage);  }  beginScroll(getScrollX(), 0, disX, 0, SCROLL_PREVIOUS);  }  }  /**  * 滚动回原图片。  */  public void scrollBack() {  if (mScroller.isFinished()) {  beginScroll(getScrollX(), 0, -getScrollX(), 0, SCROLL_BACK);  }  }  /**  * 回收所有图片对象，释放内存。  */  public void clear() {  for (int i = 0; i < mCount; i++) {  Image3DView childView = (Image3DView) getChildAt(i);  childView.recycleBitmap();  }  }  /**  * 让控件中的所有图片开始滚动。  */  private void beginScroll(int startX, int startY, int dx, int dy,  final int action) {  int duration = (int) (700f / mImageWidth * Math.abs(dx));  mScroller.startScroll(startX, startY, dx, dy, duration);  invalidate();  handler.postDelayed(new Runnable() {  @Override  public void run() {  if (action == SCROLL_NEXT || action == SCROLL_PREVIOUS) {  forceToRelayout = true;  requestLayout();  }  }  }, duration);  }  /**  * 根据当前图片的下标和传入的item参数，来判断item位置上应该显示哪张图片。  *  * @param item 取值范围是1-5  * @return 对应item位置上应该显示哪张图片。  */  private int getIndexForItem(int item) {  int index = -1;  index = mCurrentImage + item - 3;  while (index < 0) {  index = index + mCount;  }  while (index > mCount - 1) {  index = index - mCount;  }  return index;  }  /**  * 刷新所有图片的显示状态，包括当前的旋转角度。  */  private void refreshImageShowing() {  for (int i = 0; i < mItems.length; i++) {  Image3DView childView = (Image3DView) getChildAt(mItems[i]);  childView.setRotateData(i, getScrollX());  childView.invalidate();  }  }  /**  * 检查图片的边界，防止图片的下标超出规定范围。  */  private void checkImageSwitchBorder(int action) {  if (action == SCROLL_NEXT && ++mCurrentImage >= mCount) {  mCurrentImage = 0;  } else if (action == SCROLL_PREVIOUS && --mCurrentImage < 0) {  mCurrentImage = mCount - 1;  }  }  /**  * 判断是否应该滚动到下一张图片。  */  private boolean shouldScrollToNext(int velocityX) {  return velocityX < -SNAP_VELOCITY || getScrollX() > mImageWidth / 2;  }  /**  * 判断是否应该滚动到上一张图片。  */  private boolean shouldScrollToPrevious(int velocityX) {  return velocityX > SNAP_VELOCITY || getScrollX() < -mImageWidth / 2;  }  /**  * 图片滚动的监听器  */  public interface OnImageSwitchListener {  /**  * 当图片滚动时会回调此方法  *  * @param currentImage 当前图片的坐标  */  void onImageSwitch(int currentImage);  } } 

public class Image3DView extends ImageView {  /**  * 旋转角度的基准值  */  private static final float BASE_DEGREE = 50f;  /**  * 旋转深度的基准值  */  private static final float BASE_DEEP = 150f;  private Camera mCamera;  private Matrix mMaxtrix;  private Bitmap mBitmap;  /**  * 当前图片对应的下标  */  private int mIndex;  /**  * 在前图片在X轴方向滚动的距离  */  private int mScrollX;  /**  * Image3DSwitchView控件的宽度  */  private int mLayoutWidth;  /**  * 当前图片的宽度  */  private int mWidth;  /**  * 当前旋转的角度  */  private float mRotateDegree;  /**  * 旋转的中心点  */  private float mDx;  /**  * 旋转的深度  */  private float mDeep;  public Image3DView(Context context, AttributeSet attrs) {  super(context, attrs);  mCamera = new Camera();  mMaxtrix = new Matrix();  //设置可获焦 & 可点击  setFocusable(true);  setClickable(true);  }  /**  * 初始化Image3DView所需要的信息，包括图片宽度，截取背景图等。  */  public void initImageViewBitmap() {  if (mBitmap == null) {  //我们要获取cache首先要通过setDrawingCacheEnable方法开启cache，然后再调用getDrawingCache方法就可以获得view的cache图片了。  setDrawingCacheEnabled(true);  buildDrawingCache();  mBitmap = getDrawingCache();  }  mLayoutWidth = Image3DSwitchView.mWidth;  mWidth = getWidth() + Image3DSwitchView.IMAGE_PADDING * 2;  }  /**  * 设置旋转角度。  *  * @param index 当前图片的下标  * @param scrollX 当前图片在X轴方向滚动的距离  */  public void setRotateData(int index, int scrollX) {  mIndex = index;  mScrollX = scrollX;  }  /**  * 回收当前的Bitmap对象，以释放内存。  */  public void recycleBitmap() {  if (mBitmap != null && !mBitmap.isRecycled()) {  mBitmap.recycle();  }  }  @Override  public void setImageResource(int resId) {  super.setImageResource(resId);  mBitmap = null;  initImageViewBitmap();  }  @Override  public void setImageBitmap(Bitmap bm) {  super.setImageBitmap(bm);  mBitmap = null;  initImageViewBitmap();  }  @Override  public void setImageDrawable(Drawable drawable) {  super.setImageDrawable(drawable);  mBitmap = null;  initImageViewBitmap();  }  @Override  public void setImageURI(Uri uri) {  super.setImageURI(uri);  mBitmap = null;  initImageViewBitmap();  }  @Override  protected void onDraw(Canvas canvas) {  if (mBitmap == null) {  // 如果Bitmap对象还不存在，先使用父类的onDraw方法进行绘制  super.onDraw(canvas);  } else {  if (isImageVisible()) {  // 绘图时需要注意，只有当图片可见的时候才进行绘制，这样可以节省运算效率  computeRotateData();  mCamera.save();  mCamera.translate(0.0f, 0.0f, mDeep);  mCamera.rotateY(mRotateDegree);  mCamera.getMatrix(mMaxtrix);  mCamera.restore();  mMaxtrix.preTranslate(-mDx, -getHeight() / 2);  mMaxtrix.postTranslate(mDx, getHeight() / 2);  canvas.drawBitmap(mBitmap, mMaxtrix, null);  }  }  }  /**  * 在这里计算所有旋转所需要的数据。  */  private void computeRotateData() {  float degreePerPix = BASE_DEGREE / mWidth;  float deepPerPix = BASE_DEEP / ((mLayoutWidth - mWidth) / 2);  switch (mIndex) {  case 0:  mDx = mWidth;  mRotateDegree = 360f - (2 * mWidth + mScrollX) * degreePerPix;  if (mScrollX < -mWidth) {  mDeep = 0;  } else {  mDeep = (mWidth + mScrollX) * deepPerPix;  }  break;  case 1:  if (mScrollX > 0) {  mDx = mWidth;  mRotateDegree = (360f - BASE_DEGREE) - mScrollX * degreePerPix;  mDeep = mScrollX * deepPerPix;  } else {  if (mScrollX < -mWidth) {  mDx = -Image3DSwitchView.IMAGE_PADDING * 2;  mRotateDegree = (-mScrollX - mWidth) * degreePerPix;  } else {  mDx = mWidth;  mRotateDegree = 360f - (mWidth + mScrollX) * degreePerPix;  }  mDeep = 0;  }  break;  case 2:  if (mScrollX > 0) {  mDx = mWidth;  mRotateDegree = 360f - mScrollX * degreePerPix;  mDeep = 0;  if (mScrollX > mWidth) {  mDeep = (mScrollX - mWidth) * deepPerPix;  }  } else {  mDx = -Image3DSwitchView.IMAGE_PADDING * 2;  mRotateDegree = -mScrollX * degreePerPix;  mDeep = 0;  if (mScrollX < -mWidth) {  mDeep = -(mWidth + mScrollX) * deepPerPix;  }  }  break;  case 3:  if (mScrollX < 0) {  mDx = -Image3DSwitchView.IMAGE_PADDING * 2;  mRotateDegree = BASE_DEGREE - mScrollX * degreePerPix;  mDeep = -mScrollX * deepPerPix;  } else {  if (mScrollX > mWidth) {  mDx = mWidth;  mRotateDegree = 360f - (mScrollX - mWidth) * degreePerPix;  } else {  mDx = -Image3DSwitchView.IMAGE_PADDING * 2;  mRotateDegree = BASE_DEGREE - mScrollX * degreePerPix;  }  mDeep = 0;  }  break;  case 4:  mDx = -Image3DSwitchView.IMAGE_PADDING * 2;  mRotateDegree = (2 * mWidth - mScrollX) * degreePerPix;  if (mScrollX > mWidth) {  mDeep = 0;  } else {  mDeep = (mWidth - mScrollX) * deepPerPix;  }  break;  }  }  /**  * 判断当前图片是否可见。  *  * @return 当前图片可见返回true，不可见返回false。  */  private boolean isImageVisible() {  boolean isVisible = false;  switch (mIndex) {  case 0:  if (mScrollX < (mLayoutWidth - mWidth) / 2 - mWidth) {  isVisible = true;  } else {  isVisible = false;  }  break;  case 1:  if (mScrollX > (mLayoutWidth - mWidth) / 2) {  isVisible = false;  } else {  isVisible = true;  }  break;  case 2:  if (mScrollX > mLayoutWidth / 2 + mWidth / 2  || mScrollX < -mLayoutWidth / 2 - mWidth / 2) {  isVisible = false;  } else {  isVisible = true;  }  break;  case 3:  if (mScrollX < -(mLayoutWidth - mWidth) / 2) {  isVisible = false;  } else {  isVisible = true;  }  break;  case 4:  if (mScrollX > mWidth - (mLayoutWidth - mWidth) / 2) {  isVisible = true;  } else {  isVisible = false;  }  break;  }  return isVisible;  } } 

public class MainActivity extends AppCompatActivity {  private Button btn;  private Image3DSwitchView image3DSwitchView;  @Override  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  btn = (Button) findViewById(R.id.btn);  image3DSwitchView = (Image3DSwitchView) findViewById(R.id.image_switch_view);  btn.setOnKeyListener(new View.OnKeyListener() {  @Override  public boolean onKey(View v, int keyCode, KeyEvent event) {  if (keyCode == KeyEvent.KEYCODE_DPAD_UP && event.getAction()== KeyEvent.ACTION_DOWN)  image3DSwitchView.requestFocus();  return true;  }  });  //设置监听，并实现接口  image3DSwitchView.setonFocusListener(new Image3DSwitchView.OnFocusListener() {  @Override  public void onFocus() {  btn.requestFocus();  }  @Override  public void setValue(String value) {  btn.setText(value+"/7");  }   });  } } 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#000000">  <com.example.rotate3d.Image3DSwitchView  android:layout_marginTop="100dp"  android:id="@+id/image_switch_view"  android:layout_width="wrap_content"  android:layout_height="470dp" >  <com.example.rotate3d.Image3DView  android:id="@+id/image1"  android:focusable="true"  android:focusableInTouchMode="true"  android:clickable="true"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:scaleType="fitXY"  android:src="@drawable/image1" />  <com.example.rotate3d.Image3DView  android:id="@+id/image2"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:scaleType="fitXY"  android:src="@drawable/image2" />  <com.example.rotate3d.Image3DView  android:id="@+id/image3"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:scaleType="fitXY"  android:src="@drawable/image3" />  <com.example.rotate3d.Image3DView  android:id="@+id/image4"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:scaleType="fitXY"  android:src="@drawable/image4" />  <com.example.rotate3d.Image3DView  android:id="@+id/image5"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:scaleType="fitXY"  android:src="@drawable/image5" />  <com.example.rotate3d.Image3DView  android:id="@+id/image6"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:scaleType="fitXY"  android:src="@drawable/image6" />  <com.example.rotate3d.Image3DView  android:id="@+id/image7"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:scaleType="fitXY"  android:src="@drawable/image7" />  </com.example.rotate3d.Image3DSwitchView>  <Button  android:id="@+id/btn"  android:text="1/7"  android:textSize="32dp"  android:textColor="#ffffff"  android:layout_below="@+id/image_switch_view"  android:background="@drawable/button_style"  android:layout_width="match_parent"  android:layout_height="100dp" />  </RelativeLayout> 

@Override  public boolean dispatchKeyEvent(KeyEvent event) {  if (event.getAction() == KeyEvent.ACTION_DOWN){  switch (event.getKeyCode()){  //按下键 响应回调  case KeyEvent.KEYCODE_DPAD_DOWN:  if (onFocusListener != null){onFocusListener.onFocus();}  break;  //按确定键  case KeyEvent.KEYCODE_DPAD_CENTER:  Toast.makeText(getContext(),"点击了图片"+(currentPage%7+1),Toast.LENGTH_SHORT).show();  break;  //右键  case KeyEvent.KEYCODE_DPAD_RIGHT:  scrollToNext();  if (onFocusListener !=null){  onFocusListener.setValue((currentPage%7+1)+"");  }  break;  //左键  case KeyEvent.KEYCODE_DPAD_LEFT:  scrollToPrevious();  if (onFocusListener !=null){  onFocusListener.setValue((currentPage%7+1)+"");  }  break;  }  }  return true;  } 

setFocusable(true); 

public interface OnFocusListener{  void onFocus();//处理焦点  void setValue(String value);//处理当前页码 } private OnFocusListener onFocusListener; public void setonFocusListener(OnFocusListener onFocusListener){  this.onFocusListener = onFocusListener; } @Override public boolean dispatchKeyEvent(KeyEvent event) {  if (event.getAction() == KeyEvent.ACTION_DOWN){  switch (event.getKeyCode()){  //按下键 响应回调  case KeyEvent.KEYCODE_DPAD_DOWN:  if (onFocusListener != null){onFocusListener.onFocus();}  break;  //按确定键  case KeyEvent.KEYCODE_DPAD_CENTER:  Toast.makeText(getContext(),"点击了图片"+(currentPage%7+1),Toast.LENGTH_SHORT).show();  break;  //右键  case KeyEvent.KEYCODE_DPAD_RIGHT:  scrollToNext();  if (onFocusListener !=null){  onFocusListener.setValue((currentPage%7+1)+"");  }  break;  //左键  case KeyEvent.KEYCODE_DPAD_LEFT:  scrollToPrevious();  if (onFocusListener !=null){  onFocusListener.setValue((currentPage%7+1)+"");  }  break;  }  }  return true; } 

image3DSwitchView.setonFocusListener(new Image3DSwitchView.OnFocusListener() {  @Override  public void onFocus() {  btn.requestFocus();//让Image3DSwitchView控件下的按钮获得焦点  }  @Override  public void setValue(String value) {  btn.setText(value+"/7");//给按钮设置 第几页/共几页  }  });