本文实例为大家分享了android自定义滚动上下回弹scollView的具体代码，供大家参考，具体内容如下
这是一个自定义view，在xml布局中用这个view嵌套要使之可以上下回弹的view
就能实现布局可以滚动上下回弹了，自定义view代码如下：
package com.loopfire.meitaotao.view.scrollView;
import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.TranslateAnimation;
import android.widget.ScrollView;
/**
* 上下回弹 scollView
*
* @author Administrator
*
*/
public class MyScrollView extends ScrollView {
private View inner;
private float y;
private Rect normal = new Rect();
private boolean animationFinish = true;
public MyScrollView(Context context) {
super(context);
}
public MyScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onFinishInflate() {
if (getChildCount() > 0) {
inner = getChildAt(0);
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (inner == null) {
return super.onTouchEvent(ev);
} else {
commOnTouchEvent(ev);
}
return super.onTouchEvent(ev);
}
private void commOnTouchEvent(MotionEvent ev) {
if (animationFinish) {
int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
// System.out.println("ACTION_DOWN");
y = ev.getY();
super.onTouchEvent(ev);
break;
case MotionEvent.ACTION_UP:
// System.out.println("ACTION_UP");
y = 0;
if (isNeedAnimation()) {
animation();
}
super.onTouchEvent(ev);
break;
case MotionEvent.ACTION_MOVE:
// System.out.println("ACTION_MOVE");
final float preY = y == 0 ? ev.getY() : y;
float nowY = ev.getY();
int deltaY = (int) (preY - nowY);
// 滚动
// scrollBy(0, deltaY);
y = nowY;
// 当滚动到最上或者最下时就不会再滚动，这时移动布局
if (isNeedMove()) {
if (normal.isEmpty()) {
// 保存正常的布局位置
normal.set(inner.getLeft(), inner.getTop(), inner.getRight(), inner.getBottom());
}
// 移动布局
inner.layout(inner.getLeft(), inner.getTop() - deltaY / 2, inner.getRight(), inner.getBottom() - deltaY / 2);
} else {
super.onTouchEvent(ev);
}
break;
default:
break;
}
}
}
// 开启动画移动
private void animation() {
// 开启移动动画
TranslateAnimation ta = new TranslateAnimation(0, 0, 0, normal.top - inner.getTop());
ta.setDuration(200);
ta.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
animationFinish = false;
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
inner.clearAnimation();
// 设置回到正常的布局位置
inner.layout(normal.left, normal.top, normal.right, normal.bottom);
normal.setEmpty();
animationFinish = true;
}
});
inner.startAnimation(ta);
}
// 是否需要开启动画
private boolean isNeedAnimation() {
return !normal.isEmpty();
}
// 是否需要移动布局
private boolean isNeedMove() {
int offset = inner.getMeasuredHeight() - getHeight();
int scrollY = getScrollY();
if (scrollY == 0 || scrollY == offset) {
return true;
}
return false;
}
}
在xml中使用如下：
<com.loopfire.meitaotao.view.scrollView.MyScrollView>
<TextView
style="@style/form_left_text_style"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/text_margin_left2"
android:text="@string/about" />
</com.loopfire.meitaotao.view.scrollView.MyScrollView>
那么包含的这个textview可以上下滚动并且回弹了
