最近需要做幻燈片效果，仔細想想其實就是viewpage的自動切換而已，於是想到了viewpager.pagertransformer來實現，使用方法很簡單，網上也一大把，這裏不做記錄，僅僅記錄下自己用到的自定義pagertransfomer，以後如果用到可以直接用。
1.旋轉動畫
public class RotateDownPageTransformer implements ViewPager.PageTransformer {
private static final float ROT_MAX = 360.0f;
private float mRot;
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setRotation(0);
} else if (position <= 1) // a頁滑動至b頁 ； a頁從 0.0 ~ -1 ；b頁從1 ~ 0.0
{ // [-1,1]
// Modify the default slide transition to shrink the page as well
if (position < 0) {
mRot = (ROT_MAX * position);
view.setPivotX(view.getMeasuredWidth() * 0.5f);
view.setPivotY(view.getMeasuredHeight() * 0.5f);
view.setRotation(mRot);
view.setAlpha(1 + position);
view.setTranslationX(-view.getWidth()*position);
} else {
view.setAlpha(1 - position);
view.setTranslationX(-view.getWidth()*position);
mRot = (ROT_MAX * position);
view.setPivotX(view.getMeasuredWidth() * 0.5f);
view.setPivotY(view.getMeasuredHeight() * 0.5f);
view.setRotation(mRot);
}
// Scale the page down (between MIN_SCALE and 1)
// Fade the page relative to its size.
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setRotation(0);
}
}public class ZoomOutPageTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.85f;
private static final float MIN_ALPHA = 0.5f;
@SuppressLint("NewApi")
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
int pageHeight = view.getHeight();
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) { //a頁滑動至b頁 ； a頁從 0.0 -1 ；b頁從1 ~ 0.0
// [-1,1]
// Modify the default slide transition to shrink the page as well
float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
float vertMargin = pageHeight * (1 - scaleFactor) / 2;
float horzMargin = pageWidth * (1 - scaleFactor) / 2;
if (position < 0) {
view.setTranslationX(horzMargin - vertMargin / 2);
} else {
view.setTranslationX(-horzMargin + vertMargin / 2);
}
// Scale the page down (between MIN_SCALE and 1)
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
// Fade the page relative to its size.
view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE)
/ (1 - MIN_SCALE) * (1 - MIN_ALPHA));
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}3.延着Y軸進行旋轉(可以自己修改成X軸)
public class RotateCenterYPagerTransformer implements ViewPager.PageTransformer {
private static final int MAX_ROTATE = 180;
@Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 0) { // [-1,0] 控制左邊view的 靜止時他就是當前view
if (position < -0.5) {
view.setAlpha(0);
} else {
view.setAlpha(1);
}
if (position == 0) {
view.setRotationY(0);
} else {
view.setRotationY(MAX_ROTATE * position);
}
view.setTranslationX(-view.getWidth() * position);
} else if (position <= 1) { // (0,1] 1---0.5不出現
if (position >= 0.5) {
view.setTranslationX(view.getWidth() * position);
view.setAlpha(0);
} else {
view.setTranslationX(-view.getWidth() * position);
view.setAlpha(1);
}
view.setRotationY(MAX_ROTATE * position);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}4.立體空間旋轉縮放
public class DepthScaleRotatePagerTransformer implements ViewPager.PageTransformer {
private static final int MAX_ROTATE = 180;
@Override
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 0) { // [-1,0] 控制左邊view的 靜止時他就是當前view
// Use the default slide transition when moving to the left page
view.setRotationY(MAX_ROTATE * position);
view.setPivotX(pageWidth / 2);
view.setPivotY(view.getHeight() / 2);
if (position > -0.5) {
view.setTranslationX(0);
view.setScaleX(1 + position);
view.setScaleY(1 + position);
view.setAlpha(1 + position);
} else if (position == -1.0) {
view.setTranslationX(0);
view.setScaleX(1);
view.setScaleY(1);
view.setAlpha(1);
} else {
view.setScaleX(-position - 0.3f);
view.setScaleY(-position - 0.3f);
view.setTranslationX(-pageWidth * (position + 0.5f) * 2);
view.setAlpha(1 + position);
}
} else if (position <= 1) { // (0,1]
view.setPivotX(pageWidth / 2);
view.setPivotY(view.getHeight() / 2);
view.setRotationY(MAX_ROTATE * position);
if (position == 1.0f) {
view.setTranslationX(0);
view.setScaleX(1);
view.setScaleY(1);
view.setAlpha(1);
} else if (position > 0.5) {//開始滑動
view.setTranslationX(-pageWidth * (position - 0.5f) * 2);
view.setScaleX(position - 0.3f);
view.setScaleY(position - 0.3f);
view.setAlpha(1 - position);
} else {
view.setTranslationX(0);
view.setScaleX(1 - position);
view.setScaleY(1 - position);
view.setAlpha(1 - position);
}
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
5.
public class DepthPageTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.75f;
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 0) { // [-1,0] 控制左邊view的 靜止時他就是當前view
// Use the default slide transition when moving to the left page
view.setAlpha(1);
// view.setTranslationX(pageWidth*position);
view.setTranslationX(0);
view.setScaleX(1);
view.setScaleY(1);
} else if (position <= 1) { // (0,1]
// // Fade the page out.
// Log.e("TAG", "transformPage: " + position);
view.setAlpha(1 - position);
// Counteract the default slide transition
view.setTranslationX(pageWidth * -position);
// Scale the page down (between MIN_SCALE and 1)
float scaleFactor = MIN_SCALE
+ (1 - MIN_SCALE) * (1 - Math.abs(position));
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
public class AlphaChangeTransformer implements ViewPager.PageTransformer {
@Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 0) { // [-1,0] 控制左邊view的 靜止時他就是當前view
view.setAlpha(1 + position);
view.setTranslationX(-view.getWidth()*position);
} else if (position <= 1) { // (0,1]
view.setAlpha(1 - position);
view.setTranslationX(-view.getWidth()*position);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}7.
@TargetApi(18)
public class TransPageTransformer implements ViewPager.PageTransformer {
@Override
public void transformPage(View view, float position) {
int width = view.getWidth();
int height = view.getHeight();
if (position < -1) { // [-Infinity,-1)
view.setTranslationX(0);
} else if (position <= 0) { // [-1,0] 控制左邊view的 靜止時他就是當前view
if (position == -1.0f) {
view.setTranslationX(0);
} else {
view.setTranslationX(-width * position);
Rect rect = new Rect(0, 0, (int) (width * (1 + position)), height);
view.setClipBounds(rect);
}
} else if (position <= 1) { // (0,1]
if (position == 1.0f) {
view.setTranslationX(0);
} else {
view.setTranslationX(-width * position);
Rect rect = new Rect((int) (width * position), 0, width, height);
view.setClipBounds(rect);
}
} else { // (1,+Infinity]
view.setTranslationX(0);
}
}
}另外記錄一下改變自動輪播的速度的方法：
private void setViewPagerScrollSpeed(ViewPager viewPager, int speed) {
try {
Field field = ViewPager.class.getDeclaredField("mScroller");
field.setAccessible(true);
ViewPagerScroller viewPagerScroller = new ViewPagerScroller(viewPager.getContext(), new LinearInterpolator());
field.set(viewPager, viewPagerScroller);
viewPagerScroller.setDuration(speed);
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}public class ViewPagerScroller extends Scroller {
private int mDuration;
public ViewPagerScroller(Context context) {
super(context);
}
public ViewPagerScroller(Context context, Interpolator interpolator) {
super(context, interpolator);
}
public void setDuration(int mDuration) {
this.mDuration = mDuration;
}
@Override
public void startScroll(int startX, int startY, int dx, int dy) {
super.startScroll(startX, startY, dx, dy, this.mDuration);
}
@Override
public void startScroll(int startX, int startY, int dx, int dy, int duration) {
super.startScroll(startX, startY, dx, dy, this.mDuration);
}
}
