本篇文章給大家分享的是有關怎么在Android 中實現3D仿Gallery效果,小編覺得挺實用的,因此分享給大家學習,希望大家閱讀完這篇文章后可以有所收獲,話不多說,跟著小編一起來看看吧。
1.實現效果:
滾動翻頁+ 頁面點擊+頁碼指示器+焦點控制
2.實現這個效果之前必須要了解
Android高級圖片滾動控件實現3D版圖片輪播器這篇文章,我是基于他的代碼進行修改的,主要為了移植到電視上做了按鍵事件和焦點控制。
3.具體代碼:
public class Image3DSwitchView extends LinearLayout {
private int currentPage =0;//定義當前第幾頁
/**
* 圖片左右兩邊的空白間距
*/
public static final int IMAGE_PADDING = 5;
private static final int TOUCH_STATE_REST = 0;
private static final int TOUCH_STATE_SCROLLING = 1;
/**
* 滾動到下一張圖片的速度
*/
private static final int SNAP_VELOCITY = 600;
/**
* 表示滾動到下一張圖片這個動作
*/
private static final int SCROLL_NEXT = 0;
/**
* 表示滾動到上一張圖片這個動作
*/
private static final int SCROLL_PREVIOUS = 1;
/**
* 表示滾動回原圖片這個動作
*/
private static final int SCROLL_BACK = 2;
private static Handler handler = new Handler();
/**
* 控件寬度
*/
public static int mWidth;
private VelocityTracker mVelocityTracker;//主要用跟蹤觸摸屏事件(flinging事件和其他gestures手勢事件)的速率
private Scroller mScroller;
/**
* 圖片滾動監聽器,當圖片發生滾動時回調這個接口
*/
private OnImageSwitchListener mListener;
/**
* 記錄當前的觸摸狀態
*/
private int mTouchState = TOUCH_STATE_REST;
/**
* 記錄被判定為滾動運動的最小滾動值
*/
private int mTouchSlop;
/**
* 記錄控件高度
*/
private int mHeight;
/**
* 記錄每張圖片的寬度
*/
private int mImageWidth;
/**
* 記錄圖片的總數量
*/
private int mCount;
/**
* 記錄當前顯示圖片的坐標
*/
private int mCurrentImage;
/**
* 記錄上次觸摸的橫坐標值
*/
private float mLastMotionX;
/**
* 是否強制重新布局
*/
private boolean forceToRelayout;
private int[] mItems;
public Image3DSwitchView(Context context, AttributeSet attrs) {
super(context, attrs);
mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
mScroller = new Scroller(context);
//設置可以獲得焦點
setFocusable(true);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
if (changed || forceToRelayout) {
mCount = getChildCount();
// 圖片數量必須大于5,不然無法正常顯示
if (mCount < 5) {
return;
}
mWidth = getMeasuredWidth();
mHeight = getMeasuredHeight();
// 每張圖片的寬度設定為控件寬度的百分之六十
mImageWidth = (int) (mWidth * 0.6);
if (mCurrentImage >= 0 && mCurrentImage < mCount) {
mScroller.abortAnimation();
setScrollX(0);
int left = -mImageWidth * 2 + (mWidth - mImageWidth) / 2;
// 分別獲取每個位置上應該顯示的圖片下標
int[] items = {getIndexForItem(1), getIndexForItem(2),
getIndexForItem(3), getIndexForItem(4),
getIndexForItem(5)};
mItems = items;
// 通過循環為每張圖片設定位置
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()){
//按下鍵 響應回調
case KeyEvent.KEYCODE_DPAD_DOWN:
if (onFocusListener != null){onFocusListener.onFocus();}
break;
//按確定鍵
case KeyEvent.KEYCODE_DPAD_CENTER:
Toast.makeText(getContext(),"點擊了圖片"+(currentPage%7+1),Toast.LENGTH_SHORT).show();
break;
//右鍵
case KeyEvent.KEYCODE_DPAD_RIGHT:
scrollToNext();
if (onFocusListener !=null){
onFocusListener.setValue((currentPage%7+1)+"");
}
break;
//左鍵
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:
// 記錄按下時的橫坐標
mLastMotionX = x;
break;
case MotionEvent.ACTION_MOVE:
int disX = (int) (mLastMotionX - x);
mLastMotionX = x;
scrollBy(disX, 0);
// 當發生移動時刷新圖片的顯示狀態
refreshImageShowing();
break;
case MotionEvent.ACTION_UP:
mVelocityTracker.computeCurrentVelocity(1000);
int velocityX = (int) mVelocityTracker.getXVelocity();
if (shouldScrollToNext(velocityX)) {
// 滾動到下一張圖
scrollToNext();
} else if (shouldScrollToPrevious(velocityX)) {
// 滾動到上一張圖
scrollToPrevious();
} else {
// 滾動回當前圖片
scrollBack();
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
break;
}
}
return true;
}
/**
* 根據當前的觸摸狀態來決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();
}
}
/**
* 設置圖片滾動的監聽器,每當有圖片滾動時會回調此接口。
*
* @param listener 圖片滾動監聽器
*/
public void setOnImageSwitchListener(OnImageSwitchListener listener) {
mListener = listener;
}
/**
* 設置當前顯示圖片的下標,注意如果該值小于零或大于等于圖片的總數量,圖片則無法正常顯示。
*
* @param currentImage 圖片的下標
*/
public void setCurrentImage(int currentImage) {
mCurrentImage = currentImage;
requestLayout();
}
/**
* 滾動到下一張圖片。
*/
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);
}
}
/**
* 滾動到上一張圖片。
*/
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);
}
}
/**
* 滾動回原圖片。
*/
public void scrollBack() {
if (mScroller.isFinished()) {
beginScroll(getScrollX(), 0, -getScrollX(), 0, SCROLL_BACK);
}
}
/**
* 回收所有圖片對象,釋放內存。
*/
public void clear() {
for (int i = 0; i < mCount; i++) {
Image3DView childView = (Image3DView) getChildAt(i);
childView.recycleBitmap();
}
}
/**
* 讓控件中的所有圖片開始滾動。
*/
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);
}
/**
* 根據當前圖片的下標和傳入的item參數,來判斷item位置上應該顯示哪張圖片。
*
* @param item 取值范圍是1-5
* @return 對應item位置上應該顯示哪張圖片。
*/
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;
}
/**
* 刷新所有圖片的顯示狀態,包括當前的旋轉角度。
*/
private void refreshImageShowing() {
for (int i = 0; i < mItems.length; i++) {
Image3DView childView = (Image3DView) getChildAt(mItems[i]);
childView.setRotateData(i, getScrollX());
childView.invalidate();
}
}
/**
* 檢查圖片的邊界,防止圖片的下標超出規定范圍。
*/
private void checkImageSwitchBorder(int action) {
if (action == SCROLL_NEXT && ++mCurrentImage >= mCount) {
mCurrentImage = 0;
} else if (action == SCROLL_PREVIOUS && --mCurrentImage < 0) {
mCurrentImage = mCount - 1;
}
}
/**
* 判斷是否應該滾動到下一張圖片。
*/
private boolean shouldScrollToNext(int velocityX) {
return velocityX < -SNAP_VELOCITY || getScrollX() > mImageWidth / 2;
}
/**
* 判斷是否應該滾動到上一張圖片。
*/
private boolean shouldScrollToPrevious(int velocityX) {
return velocityX > SNAP_VELOCITY || getScrollX() < -mImageWidth / 2;
}
/**
* 圖片滾動的監聽器
*/
public interface OnImageSwitchListener {
/**
* 當圖片滾動時會回調此方法
*
* @param currentImage 當前圖片的坐標
*/
void onImageSwitch(int currentImage);
}
}public class Image3DView extends ImageView {
/**
* 旋轉角度的基準值
*/
private static final float BASE_DEGREE = 50f;
/**
* 旋轉深度的基準值
*/
private static final float BASE_DEEP = 150f;
private Camera mCamera;
private Matrix mMaxtrix;
private Bitmap mBitmap;
/**
* 當前圖片對應的下標
*/
private int mIndex;
/**
* 在前圖片在X軸方向滾動的距離
*/
private int mScrollX;
/**
* Image3DSwitchView控件的寬度
*/
private int mLayoutWidth;
/**
* 當前圖片的寬度
*/
private int mWidth;
/**
* 當前旋轉的角度
*/
private float mRotateDegree;
/**
* 旋轉的中心點
*/
private float mDx;
/**
* 旋轉的深度
*/
private float mDeep;
public Image3DView(Context context, AttributeSet attrs) {
super(context, attrs);
mCamera = new Camera();
mMaxtrix = new Matrix();
//設置可獲焦 & 可點擊
setFocusable(true);
setClickable(true);
}
/**
* 初始化Image3DView所需要的信息,包括圖片寬度,截取背景圖等。
*/
public void initImageViewBitmap() {
if (mBitmap == null) {
//我們要獲取cache首先要通過setDrawingCacheEnable方法開啟cache,然后再調用getDrawingCache方法就可以獲得view的cache圖片了。
setDrawingCacheEnabled(true);
buildDrawingCache();
mBitmap = getDrawingCache();
}
mLayoutWidth = Image3DSwitchView.mWidth;
mWidth = getWidth() + Image3DSwitchView.IMAGE_PADDING * 2;
}
/**
* 設置旋轉角度。
*
* @param index 當前圖片的下標
* @param scrollX 當前圖片在X軸方向滾動的距離
*/
public void setRotateData(int index, int scrollX) {
mIndex = index;
mScrollX = scrollX;
}
/**
* 回收當前的Bitmap對象,以釋放內存。
*/
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對象還不存在,先使用父類的onDraw方法進行繪制
super.onDraw(canvas);
} else {
if (isImageVisible()) {
// 繪圖時需要注意,只有當圖片可見的時候才進行繪制,這樣可以節省運算效率
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);
}
}
}
/**
* 在這里計算所有旋轉所需要的數據。
*/
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;
}
}
/**
* 判斷當前圖片是否可見。
*
* @return 當前圖片可見返回true,不可見返回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;
}
});
//設置監聽,并實現接口
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.自己的成長點:
①響應遙控器按鍵事件:重寫Image3DSwitchView類的dispatchKeyEvent()函數
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN){
switch (event.getKeyCode()){
//按下鍵 響應回調
case KeyEvent.KEYCODE_DPAD_DOWN:
if (onFocusListener != null){onFocusListener.onFocus();}
break;
//按確定鍵
case KeyEvent.KEYCODE_DPAD_CENTER:
Toast.makeText(getContext(),"點擊了圖片"+(currentPage%7+1),Toast.LENGTH_SHORT).show();
break;
//右鍵
case KeyEvent.KEYCODE_DPAD_RIGHT:
scrollToNext();
if (onFocusListener !=null){
onFocusListener.setValue((currentPage%7+1)+"");
}
break;
//左鍵
case KeyEvent.KEYCODE_DPAD_LEFT:
scrollToPrevious();
if (onFocusListener !=null){
onFocusListener.setValue((currentPage%7+1)+"");
}
break;
}
}
return true;
}注意:要能響應點擊事件的前提必須是控件可以獲得焦點,所以在構造函數中加上
setFocusable(true);
②回調機制:類似Android TV開發:使用RecycleView實現橫向的Listview并響應點擊事件的代碼的原理。 越來越發現回調技術的好用:輕松通過接口函數里面的參數把動態變化的變量傳遞到mainActivity
public interface OnFocusListener{
void onFocus();//處理焦點
void setValue(String value);//處理當前頁碼
}
private OnFocusListener onFocusListener;
public void setonFocusListener(OnFocusListener onFocusListener){
this.onFocusListener = onFocusListener;
www.jb51.net/article/140153.htm}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN){
switch (event.getKeyCode()){
//按下鍵 響應回調
case KeyEvent.KEYCODE_DPAD_DOWN:
if (onFocusListener != null){onFocusListener.onFocus();}
break;
//按確定鍵
case KeyEvent.KEYCODE_DPAD_CENTER:
Toast.makeText(getContext(),"點擊了圖片"+(currentPage%7+1),Toast.LENGTH_SHORT).show();
break;
//右鍵
case KeyEvent.KEYCODE_DPAD_RIGHT:
scrollToNext();
if (onFocusListener !=null){
onFocusListener.setValue((currentPage%7+1)+"");
}
break;
//左鍵
case KeyEvent.KEYCODE_DPAD_LEFT:
scrollToPrevious();
if (onFocusListener !=null){
onFocusListener.setValue((currentPage%7+1)+"");
}
break;
}
}
return true;
}在acitivity中調用
image3DSwitchView.setonFocusListener(new Image3DSwitchView.OnFocusListener() {
@Override
public void onFocus() {
btn.requestFocus();//讓Image3DSwitchView控件下的按鈕獲得焦點
}
@Override
public void setValue(String value) {
btn.setText(value+"/7");//給按鈕設置 第幾頁/共幾頁
}
});以上就是怎么在Android 中實現3D仿Gallery效果,小編相信有部分知識點可能是我們日常工作會見到或用到的。希望你能通過這篇文章學到更多知識。更多詳情敬請關注億速云行業資訊頻道。
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