廢話不多說了,直接給大家貼代碼了,具體代碼如下所示:

public class BounceBackViewPager extends ViewPager {
private int currentPosition = 0;
private Rect mRect = new Rect();//用來記錄初始位置
private boolean handleDefault = true;
private float preX = 0f;
private static final float RATIO = 0.5f;//摩擦系數(shù)
private static final float SCROLL_WIDTH = 10f;
public BounceBackViewPager(Context context) {
super(context);
}
public BounceBackViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
return super.dispatchKeyEvent(event);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
preX = ev.getX();//記錄起點(diǎn)
currentPosition = getCurrentItem();
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_UP:
onTouchActionUp();
break;
case MotionEvent.ACTION_MOVE:
if (getAdapter().getCount() == 1) {
float nowX = ev.getX();
float offset = nowX - preX;
preX = nowX;
if (offset > SCROLL_WIDTH) {//手指滑動的距離大于設(shè)定值
whetherConditionIsRight(offset);
} else if (offset < -SCROLL_WIDTH) {
whetherConditionIsRight(offset);
} else if (!handleDefault) {//這種情況是已經(jīng)出現(xiàn)緩沖區(qū)域了,手指慢慢恢復(fù)的情況
if (getLeft() + (int) (offset * RATIO) != mRect.left) {
layout(getLeft() + (int) (offset * RATIO), getTop(), getRight() + (int) (offset * RATIO), getBottom());
}
}
} else if ((currentPosition == 0 || currentPosition == getAdapter().getCount() - 1)) {
float nowX = ev.getX();
float offset = nowX - preX;
preX = nowX;
if (currentPosition == 0) {
if (offset > SCROLL_WIDTH) {//手指滑動的距離大于設(shè)定值
whetherConditionIsRight(offset);
} else if (!handleDefault) {//這種情況是已經(jīng)出現(xiàn)緩沖區(qū)域了,手指慢慢恢復(fù)的情況
if (getLeft() + (int) (offset * RATIO) >= mRect.left) {
layout(getLeft() + (int) (offset * RATIO), getTop(), getRight() + (int) (offset * RATIO), getBottom());
}
}
} else {
if (offset < -SCROLL_WIDTH) {
whetherConditionIsRight(offset);
} else if (!handleDefault) {
if (getRight() + (int) (offset * RATIO) <= mRect.right) {
layout(getLeft() + (int) (offset * RATIO), getTop(), getRight() + (int) (offset * RATIO), getBottom());
}
}
}
} else {
handleDefault = true;
}
if (!handleDefault) {
return true;
}
break;
default:
break;
}
return super.onTouchEvent(ev);
}
private void whetherConditionIsRight(float offset) {
if (mRect.isEmpty()) {
mRect.set(getLeft(), getTop(), getRight(), getBottom());
}
handleDefault = false;
layout(getLeft() + (int) (offset * RATIO), getTop(), getRight() + (int) (offset * RATIO), getBottom());
}
private void onTouchActionUp() {
if (!mRect.isEmpty()) {
recoveryPosition();
}
}
private void recoveryPosition() {
TranslateAnimation ta = new TranslateAnimation(getLeft(), mRect.left, 0, 0);
ta.setDuration(300);
startAnimation(ta);
layout(mRect.left, mRect.top, mRect.right, mRect.bottom);
mRect.setEmpty();
handleDefault = true;
}
}
當(dāng)前名稱:Android實現(xiàn)ViewPager邊界回彈效果實例代碼-創(chuàng)新互聯(lián)
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