转载请标明出处：https://blog.csdn.net/hj_key/article/details/102812987
最近项目中变态需求，要在滑动列表中加入滑动缩放效果；
上滑顶部缩小，底部放大；下滑底部缩小，顶部放大。
所以自定义GridView，实现动画效果
package com.test.gridview.ui.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.GridView;
import android.widget.ImageView;
import android.view.MotionEvent;
import android.widget.AdapterView;
import android.content.Intent;
public class XunGridView extends GridView {
private static final String TAG = "zhj";
private int width;
private int height;
private int gridViewHeight;
private int diff;
private int bdiff;
private int visibleCount;
private int sourceWidth = 113;
private View topView1, topView2, topView3, bottomView1, bottomView2, bottomView3;
private int lastView1Left, lastView1Right, lastView2Left, lastView2Right, lastView3Left, lastView3Right;
private View tempLastView2, tempLastView3;
private boolean isAlreadMove;//防止点击的时候滑动
boolean isTopTop = false;
boolean CouldDismiss = false;
private Context mContext;
private boolean isScroll = false;
private int mScrollState = -1;
public XunGridView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
initListener();
}
public XunGridView(Context context) {
super(context);
mContext = context;
initListener();
}
/**private void toTellAppStoreUIDismiss(){
Intent intent = new Intent();
intent.setAction("com.xiaoxun.appstore.task.dismiss_self");
intent.setPackage("com.xxun.xunlauncher");
mContext.sendBroadcast(intent);
}*/
public boolean CouldDismiss(){
if(diff == 0 && getFirstVisiblePosition() == 0 && !isScroll){
CouldDismiss = true;
}
if(diff < 0){
CouldDismiss = false;
}
return CouldDismiss;
}
private void initListener() {
setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
//Log.d("zhj","isTopTop = "+ isTopTop + ", 33 scrollState = " + scrollState);
if(scrollState == 1){
isScroll = true;
}else{
isScroll = false;
}
mScrollState = scrollState;
if(isTopTop && scrollState == 0){
//toTellAppStoreUIDismiss();
CouldDismiss = true;
}else{
CouldDismiss = false;
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
visibleCount = visibleItemCount;
int position = 0;
View view1 = getChildAt(position);
if (view1 != null && height != 0) {
int top = view1.getTop();
diff = (int)top /2;
//Log.d(TAG, "onScroll: top = " + top + " height = " + height + " diff = " + diff);
}
if (diff > 0) {
diff = 0;
}
//Log.d("zhj","diff = " + diff);
if(firstVisibleItem == 0){
isTopTop = true;
}
if(visibleItemCount + firstVisibleItem == totalItemCount){
isTopTop = false;
}
int half = (int)sourceWidth / 3;
if(-diff >= half){
diff = -half;
}
View view2 = getChildAt(visibleCount - 1);
if (view2 != null && gridViewHeight != 0) {
int bottom = view2.getBottom();
bdiff = gridViewHeight - bottom;
//Log.i(TAG, "onScroll: getBottom = " + bottom + " getHeight() = " + gridViewHeight + " bdiff = " + bdiff);
}
if (bdiff > 0) {
bdiff = 0;
}
if(-bdiff >= half){
bdiff = -half;
}
requestLayout();
}
});
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
isAlreadMove = false;
doOnMeasure();
}
private void doOnMeasure() {
if (gridViewHeight == 0) {
gridViewHeight = getHeight();
}
// ===== first line ======//
int tw = width + diff;
int th = height + diff;
for (int i = 0; i < 3; i++) {
View view = getChildAt(i);
if (view != null && (width == 0 || height == 0)) {
width = view.getMeasuredWidth();
height = view.getMeasuredHeight();
tw = width + diff;
th = height + diff;
}
//更改高度
updateWidth(view, tw, th, true);
//恢复上一个控件的高宽 用于快速滑动时恢复
/**if (i == 0) {
resetWidth(view, topView1, true);
} else if (i == 1) {
resetWidth(view, topView2, true);
} else {
resetWidth(view, topView3, true);
}*/
}
// ===== last line ======//
int lastLineCount = visibleCount % 3;
if (lastLineCount == 0) {
lastLineCount = 3;
}
int bw = width + bdiff;
int bh = height + bdiff;
for (int i = 1; i <= lastLineCount; i++) {
View view = getChildAt(visibleCount - i);
updateWidth(view, bw, bh, false);
/**if (lastLineCount == 3) {
if (i == 1) {
resetWidth(view, bottomView3, false);
} else if (i == 2) {
resetWidth(view, bottomView2, false);
} else {
resetWidth(view, bottomView1, false);
}
} else if (lastLineCount == 2) {
if (i == 1) {
resetWidth(view, bottomView2, false);
} else {
resetWidth(view, bottomView1, false);
}
resetWidth(view, tempLastView3, false);
} else {
resetWidth(view, bottomView1, false);
resetWidth(view, tempLastView2, false);
resetWidth(view, tempLastView3, false);
}*/
}
resetAllViewWidth();
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
//Log.d("zhj","======= **** onLayout **** ========= ");
//doOnMeasure();
// ===== modify first line && first view place======//
View view1 = getChildAt(0);
if (view1 != null) {
if (lastView1Left == 0 || lastView1Right == 0) {
lastView1Left = view1.getLeft();
lastView1Right = view1.getRight();
}
int lf = lastView1Left - 2 * Math.round(diff / 2f);
if (lf <= lastView1Left) {
lf = lastView1Left;
}
int rg = lastView1Right - 2 * Math.round(diff / 2f);
if (rg <= lastView1Right) {
rg = lastView1Right;
}
//Log.d(TAG, "onLayout: 1111 lf = " + lf + ", rg = " + rg + ", width = " + view1.getMeasuredWidth());
view1.layout(lf, view1.getTop(), rg, view1.getBottom());
}else{
Log.d("zhj","view1 is exception null ");
}
/**if (topView1 != null && topView1 != view1) {
Log.d(TAG, "onLayout: topView11 lastView1Left = " + lastView1Left + ", lastView1Right = " + lastView1Right);
topView1.layout(lastView1Left, topView1.getTop(), lastView1Right, topView1.getBottom());
}
topView1 = view1;*/
// ===== modify first line && second view place======//
View view2 = getChildAt(1);
if (view2 != null) {
if (lastView2Left == 0 || lastView2Right == 0) {
lastView2Left = view2.getLeft();
lastView2Right = view2.getRight();
}
//Log.d(TAG, "onLayout: 222 lastView2Left = " + lastView2Left + ", lastView2Right =" + lastView2Right);
int lf = lastView2Left - Math.round(diff / 2f);
if (lf >= lastView2Left) {
lf = lastView2Left;
}
int rg = lastView2Right + Math.round(diff / 2f);
if (rg >= lastView2Right) {
rg = lastView2Right;
}
//Log.d(TAG, "onLayout: 222 lf = " + lf + ", rg = " + rg + ", width = " + view2.getMeasuredWidth());
view2.layout(lf, view2.getTop(), rg, view2.getBottom());
}else{
Log.d("zhj","view2 is exception null ");
}
/**if (topView2 != null && topView2 != view2) {
topView2.layout(lastView2Left, topView2.getTop(), lastView2Right, topView2.getBottom());
}
topView2 = view2;*/
// ===== modify first line && third view place======//
View view3 = getChildAt(2);
if(view3 == view2){
Log.d("zhj","is exception " + view3.getLeft());
}
if (view3 != null) {
if (lastView3Left == 0 || lastView3Right == 0) {
lastView3Left = view3.getLeft();
lastView3Right = view3.getRight();
}
//Log.d(TAG, "onLayout: 333 lastView3Left = " + lastView3Left + ", lastView3Right =" + lastView3Right);
int lf = lastView3Left + 2 * Math.round(diff / 2f);
if (lf >= lastView3Left) {
lf = lastView3Left;
}
int rg = lastView3Right + 2 * Math.round(diff / 2f);
if (rg >= lastView3Right) {
rg = lastView3Right;
}
//Log.d(TAG, "onLayout: 333 lf = " + lf + ", rg = " + rg + ", width = " + view3.getMeasuredWidth());
view3.layout(lf, view3.getTop(), rg, view3.getBottom());
}else{
Log.d("zhj","view3 is exception null ");
}
/**if (topView3 != null && topView3 != view3) {
Log.d(TAG, "onLayout: topView3 lastView3Left = " + lastView3Left + ", lastView3Right = " + lastView3Right);
topView3.layout(lastView3Left, topView3.getTop(), lastView3Right, topView3.getBottom());
}
topView3 = view3;*/
///==================================================================================================
int lastLineCount = visibleCount % 3;
//Log.d(TAG, "onLayout: lastLineCount = " + lastLineCount);
if (lastLineCount == 0) {
lastLineCount = 3;
}
for (int i = 1; i <= lastLineCount; i++) {
View view = getChildAt(visibleCount - i);
if (lastLineCount == 1) {
if (view != null) {
int x = 2 * Math.round(bdiff / 2f);
int lf = lastView1Left - x;
if (lf <= lastView1Left) {
lf = lastView1Left;
}
int rg = lastView1Right - x;
if (rg <= lastView1Right) {
rg = lastView1Right;
}
view.layout(lf, view.getTop(), rg, view.getBottom());
}
/**if (bottomView1 != null && bottomView1 != view) {
bottomView1.layout(lastView1Left, bottomView1.getTop(), lastView1Right, bottomView1.getBottom());
}
bottomView1 = view;*/
} else if (lastLineCount == 2) {
if (i == 1) {
if (view != null) {
int x = Math.round(bdiff / 2f);
int lf = lastView2Left - x;
if (lf <= lastView2Left) {
lf = lastView2Left;
}
int rg = lastView2Right + x;
if (rg <= lastView2Right) {
rg = lastView2Right;
}
view.layout(lf, view.getTop(), rg, view.getBottom());
}
/**if (bottomView2 != null && bottomView2 != view) {
bottomView2.layout(lastView2Left, bottomView2.getTop(), lastView2Right, bottomView2.getBottom());
}
bottomView2 = view;*/
} else if (i == 2) {
if (view != null) {
int x = 2 * Math.round(bdiff / 2f);
int lf = lastView1Left - x;
if (lf <= lastView1Left) {
lf = lastView1Left;
}
int rg = lastView1Right - x;
if (rg <= lastView1Right) {
rg = lastView1Right;
}
view.layout(lf, view.getTop(), rg, view.getBottom());
}
/**if (bottomView1 != null && bottomView1 != view) {
bottomView1.layout(lastView1Left, bottomView1.getTop(), lastView1Right, bottomView1.getBottom());
}
bottomView1 = view;*/
}
/**if (bottomView3 != null && bottomView3 != view) {
bottomView3.layout(lastView3Left, bottomView3.getTop(), lastView3Right, bottomView3.getBottom());
}*/
} else {
if (i == 1) {
if (view != null) {
int x = 2 * Math.round(bdiff / 2f);
int lf = lastView3Left + x;
if (lf >= lastView3Left) {
lf = lastView3Left;
}
int rg = lastView3Right + x;
if (rg >= lastView3Right) {
rg = lastView3Right;
}
//Log.d(TAG, "bottomView3 x =" + x + ", lf = " + lf + ", rg =" + rg);
view.layout(lf, view.getTop(), rg, view.getBottom());
}
/**if (bottomView3 != null && bottomView3 != view) {
bottomView3.layout(lastView3Left, bottomView3.getTop(), lastView3Right, bottomView3.getBottom());
}
bottomView3 = view;*/
tempLastView3 = view;
} else if (i == 2) {
if (view != null) {
int x = Math.round(bdiff / 2f);
int lf = lastView2Left - x;
if (lf >= lastView2Left) {
lf = lastView2Left;
}
int rg = lastView2Right + x;
if (rg >= lastView2Right) {
rg = lastView2Right;
}
//Log.d(TAG, "bottomView2 x =" + x + ", lf = " + lf + ", rg =" + rg);
view.layout(lf, view.getTop(), rg, view.getBottom());
}
/**if (bottomView2 != null && bottomView2 != view) {
bottomView2.layout(lastView2Left, bottomView2.getTop(), lastView2Right, bottomView2.getBottom());
}
bottomView2 = view;*/
tempLastView2 = view;
} else {
if (view != null) {
int x = 2 * Math.round(bdiff / 2f);
int lf = lastView1Left - x;
if (lf <= lastView1Left) {
lf = lastView1Left;
}
int rg = lastView1Right - x;
if (rg <= lastView1Right) {
rg = lastView1Right;
}
view.layout(lf, view.getTop(), rg, view.getBottom());
}
/**if (bottomView1 != null && bottomView1 != view) {
bottomView1.layout(lastView1Left, bottomView1.getTop(), lastView1Right, bottomView1.getBottom());
}
bottomView1 = view;*/
}
}
}
resetAllViewLayout();
}
public void resetAllViewWidth() {
int count = getChildCount();
if (count > 0) {
for (int i = 0; i < count; i++) {
int lastLineCount = count % 3;
if (lastLineCount == 0) {
lastLineCount = 3;
}
View view = getChildAt(i);
if (i != 0 && i != 1 && i != 2 && lastLineSureReset(i, lastLineCount, count)) {
updateWidth(view, 112, 112, true);
}
}
}
}
public void resetAllViewLayout() {
int count = getChildCount();
if (count > 0) {
for (int i = 0; i < count; i++) {
int lastLineCount = count % 3;
if (lastLineCount == 0) {
lastLineCount = 3;
}
View view = getChildAt(i);
int diff = view.getTop();
//Log.d("zhj","Lauout view diff = " + diff );
if (i != 0 && i != 1 && i != 2 && lastLineSureReset(i, lastLineCount, count)) {
//Log.d("zhj","count = " + count + ", i = " + i + " , i % 3 = " + (i % 3));
if(i % 3 == 0){
view.layout(5, view.getTop(), 117, view.getBottom());
}else if(i % 3 == 1){
view.layout(127, view.getTop(), 239, view.getBottom());
}else if(i % 3 == 2){
view.layout(249, view.getTop(), 361, view.getBottom());
}
}
}
}
}
private boolean lastLineSureReset(int index, int lastLineCount, int count) {
//Log.d("zhj","index = " + index + ", lastLineCount = " + lastLineCount + ", count = " + count);
if (lastLineCount == 3) {
if(count < 3) return false;
if (index != (count - 1) && index != (count - 2) && index != (count - 3)) {
return true;
}
} else if (lastLineCount == 2) {
if(count < 2) return false;
if (index != (count - 1) && index != (count - 2)) {
return true;
}
} else {
if (index != (count - 1)) {
return true;
}
}
return false;
}
@Override
protected void layoutChildren() {
// TODO Auto-generated method stub
if(!isAlreadMove){
super.layoutChildren();
}
isAlreadMove = true;
}
/**
* 重置恢复控件大小
*
* @param view 当前行控件
* @param lastView 需要恢复大小的控件
*/
private void resetWidth(View view, View lastView, boolean isTop) {
if (lastView != null && lastView != view) {
//Log.d("zhj"," ===== resetWidth ====");
updateWidth(lastView, width, height, isTop);
}
}
/**
* 更新控件大小
*
* @param view 需要更新的控件
* @param width 更新宽度
*/
private void updateWidth(View view, int width, int height, boolean isTop) {
if (view == null) {
//Log.d("zhj","==== updateWidth view is null =======");
return;
}
ImageView tempView = (ImageView)view.findViewById(R.id.mAppImage);
if (tempView == null) {
return;
}
if(isTop){
tempView.setScaleType(ImageView.ScaleType.FIT_END);
}else{
tempView.setScaleType(ImageView.ScaleType.FIT_START);
}
ViewGroup.LayoutParams lp = tempView.getLayoutParams();
//lp.height = height;
//Log.d("zhj","updateWidth >>> width = " + width);
if (width > this.width) {
width = this.width;
} else if (width < 0) {
width = this.width;
}
lp.width = width;
tempView.setLayoutParams(lp);
}
}