Android TV开发:实现3D仿Gallery效果的实例代码

本文讲述了Android TV开发:实现3D仿Gallery效果的实例代码。分享给大家供大家参考，具体如下：

1.实现效果：

滚动翻页+ 页面点击+页码指示器+焦点控制

2.实现这个效果之前必须要了解

Android高级图片滚动控件实现3D版图片轮播器这篇文章，我是基于他的代码进行修改的，主要为了移植到电视上做了按键事件和焦点控制。

3.具体代码：

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>

4.自己的成长点：

①响应遥控器按键事件：重写Image3DSwitchView类的dispatchKeyEvent()函数

@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;
 }

注意:要能响应点击事件的前提必须是控件可以获得焦点，所以在构造函数中加上

setFocusable(true);

②回调机制：类似Android TV开发：使用RecycleView实现横向的Listview并响应点击事件的代码的原理。 越来越发现回调技术的好用：轻松通过接口函数里面的参数把动态变化的变量传递到mainActivity

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;
<a target="_blank" href="http://www.zzvips.com/article/140153.htm">www.zzvips.com/article/140153.htm</a>}
@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;
}

在acitivity中调用

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
 }
 });

5.源码+apk下载地址

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/meetings/article/details/52950204