网易美聊效果的仿照实现
来源：互联网 发布：node v4.5.0 x64.msi 编辑：程序博客网 时间：2024/05/09 11:28
实现思路：自定义一个ScrollView，在scroll的时候将滑动到的位置，当前的手势回传处理：滑动的过程判断滑到那两个View之间，上边的View压缩（设置LayoutParams，其高为当前标准高*放大倍数-滑动距离+之前滑过View的总高度），下边的view拉伸（设置LayoutParams，其高为当前标准高+滑动距离-之前滑过的View的总高度）
记录在探索ScrollView控件使用过程的问题
关于如何判断是否在Scroll的顶部和底部
LinearLayout ll;//ll为ScrollView的唯一子控件public void onWindowFocusChanged(boolean hasWindowFocus) { if(hasWindowFocus){ ll= (LinearLayout) getChildAt(0); //得到子View的高度 android.util.Log.i("___+", "ll.getMeasuredHeight()"+ll.getMeasuredHeight()/3); //表示得到y轴的滚动距离 android.util.Log.i("___+", "getScrollY()"+getScrollY()/3); //getHeight()为scrollView的高度。 android.util.Log.i("___+", "getHeight()"+getHeight()/3); //当getScrollY()达到最大时加上scrollView的高度就的就等于它内容的高度了 }};`protected void onScrollChanged(int l, int t, int oldl, int oldt) {` if(ll!=null&&ll.getMeasuredHeight()==getHeight()+getScrollY()&&!inBottom){ //if(getScrollY()==computeVerticalScrollRange()){没生效 inBottom=true; Toast.makeText(context, "到底了", 1000).show(); }else if(getScrollY()==0){ Toast.makeText(context, "到顶了", 1000).show(); }else{ inBottom = false; }};
- 自定义ScrollView，监听滑动，手势抬，手势落
public class RankScrollView extends ScrollView implements View.OnTouchListener{ @Override public void fling(int velocityY) { // TODO Auto-generated method stub // 减速，防止滑动过快 super.fling(velocityY/8); } private Context context; private GestureDetector getsture; public RankScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); this.context = context; //代码中设置是否显示滚动条，在xml中设置android:scrollbars="horizontal"配合setVerticalScrollBarEnabled(true)效果起来。 setVerticalScrollBarEnabled(true); setOnTouchListener(this); getsture = new GestureDetector(context,getstureListener); } private boolean BEFORE_UP_ACITION_UP = false; @Override public boolean onTouch(View v, MotionEvent event) { /** * 指定scrollView滚动到底部或者顶部 */ //scrollView.fullScroll(ScrollView.FOCUS_DOWN);滚动到底部 //scrollView.fullScroll(ScrollView.FOCUS_UP);滚动到顶部 switch (event.getAction()) { case MotionEvent.ACTION_UP: onScrollChangeListener.onaction_Up(BEFORE_UP_ACITION_UP); break; case MotionEvent.ACTION_DOWN: onScrollChangeListener.onaction_Down(); break; case MotionEvent.ACTION_MOVE: onScrollChangeListener.onaction_Down(); break; default: break; } return getsture.onTouchEvent(event); } private onScrollChange onScrollChangeListener; public interface onScrollChange{ public void onUp(int oldt,int t); public void onDown(int oldt,int t); public void currentIndex(int scrollY); public void onaction_Up(boolean isUp); public void onaction_Down(); } public void setOnScrollChange(onScrollChange onScrollChangeListener){ this.onScrollChangeListener = onScrollChangeListener; } GestureDetector.SimpleOnGestureListener getstureListener = new SimpleOnGestureListener(){ @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { // TODO Auto-generated method stub if(distanceY>0){ //下滑 BEFORE_UP_ACITION_UP = false; android.util.Log.i("","distanceY"+distanceY); }else{ //上滑 BEFORE_UP_ACITION_UP = true; android.util.Log.i("","distanceY"+distanceY); } return super.onScroll(e1, e2, distanceX, distanceY); } }; protected void onScrollChanged(int l, int t, int oldl, int oldt) { onScrollChangeListener.currentIndex(getScrollY()); android.util.Log.i("","getScrollY"+getScrollY()); if(oldt<t){ onScrollChangeListener.onDown(oldt,t); }else{ onScrollChangeListener.onUp(oldt,t); } };- 在自定义的ScrollView中加入若干等高的布局，滑动过程中临近的子布局有缩放效果
public class RankActivity extends Activity implements RankScrollView.onScrollChange,View.OnClickListener{RankScrollView mScrollView;LinearLayout rankHot,rankRich,rankCharm,rankSuperStar,rankWeekStar;LinearLayout collectLin,expendLin;LayoutParams collectParams;LayoutParams expendParams;LayoutParams normalParams;private int SINGLE_ITEM_HEIGHT;private int Double_Item_Height_index = 0;private final int SCALE =2;//放大倍数和正常高度的比例。private int mScrollY = 0;private LinearLayout llImageViews;private int totalHeight;private int disableScrollHeight=0;private boolean isLastItem = false;private boolean isDownDirection = true;private int mPostion = 0;private int contentTop;private int t;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout_rank); SINGLE_ITEM_HEIGHT = DisplayUtils.dp2px(100); mScrollView = (RankScrollView) findViewById(R.id.id_scroll_contain); mScrollView.setOnScrollChange(this); rankHot = (LinearLayout) findViewById(R.id.id_rank_hot); rankRich = (LinearLayout) findViewById(R.id.id_rank_rich); rankCharm = (LinearLayout) findViewById(R.id.id_rank_charm); rankSuperStar = (LinearLayout) findViewById(R.id.id_rank_superstar); rankWeekStar = (LinearLayout) findViewById(R.id.id_rank_weekstar); rankHot.setOnClickListener(this); rankRich.setOnClickListener(this); rankCharm.setOnClickListener(this); rankSuperStar.setOnClickListener(this); rankWeekStar.setOnClickListener(this); expendParams = new LayoutParams(LayoutParams.MATCH_PARENT,SINGLE_ITEM_HEIGHT*SCALE); rankHot.setLayoutParams(expendParams); llImageViews = (LinearLayout) findViewById(R.id.child1); normalParams = new LayoutParams(LayoutParams.MATCH_PARENT,SINGLE_ITEM_HEIGHT); requestTopThreeHead();}@Overridepublic void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); if (hasFocus) { //设置填充view的高度,scrollView高度除了子项外还需要一个空的布局，使最后一个子项能滑动到顶部 totalHeight = llImageViews.getHeight(); contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop(); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,getResources().getDisplayMetrics().heightPixels-getTitleLayerHeight()-getStatusLayerHeight()-SCALE*SINGLE_ITEM_HEIGHT); findViewById(R.id.id_fill_in_view).setLayoutParams(params); }}// 得到状态栏高度private int getStatusLayerHeight() { Rect frame = new Rect(); getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); int statusBarHeight = frame.top;// 60px return statusBarHeight;}// 得到标题栏高度private int getTitleLayerHeight() { int contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop(); // statusBarHeight是上面所求的状态栏的高度 int titleBarHeight = contentTop - getStatusLayerHeight();// 144px\ return titleBarHeight;}@Overridepublic void onUp(int oldt, int t) { this.t = t; onUpImplements(oldt, t);}private void onUpImplements(int oldt, int t) { isDownDirection = false; //使用scrollTo的时候注掉 /** * if(mScrollY<=0){ //防止第一个无限度放大 return; } */// if(mScrollY>=disableScrollHeight+SINGLE_ITEM_HEIGHT){// //防止最后一个个无限度放大// return;// } reSetHeight(); // 压缩第一个的比例 collectParams = new LayoutParams(LayoutParams.MATCH_PARENT, SINGLE_ITEM_HEIGHT*SCALE - t + SINGLE_ITEM_HEIGHT*Double_Item_Height_index); collectLin.setLayoutParams(collectParams); // 拉伸第二个的比例 expendParams = new LayoutParams(LayoutParams.MATCH_PARENT,SINGLE_ITEM_HEIGHT + t - SINGLE_ITEM_HEIGHT*Double_Item_Height_index); expendLin.setLayoutParams(expendParams);}@Overridepublic void onDown(int oldt, int t) { this.t = t; onDownImplements(oldt, t);}private void onDownImplements(int oldt, int t) { isDownDirection = true; if((mScrollY>=disableScrollHeight+SINGLE_ITEM_HEIGHT&&disableScrollHeight>0)||mScrollY>=4*SINGLE_ITEM_HEIGHT){ //防止最后一个个无限度放大 return; } reSetHeight(); // 拉伸后一个的比例 expendParams = new LayoutParams(LayoutParams.MATCH_PARENT,SINGLE_ITEM_HEIGHT + t-SINGLE_ITEM_HEIGHT*Double_Item_Height_index); expendLin.setLayoutParams(expendParams); // 压缩前一个的比例 collectParams = new LayoutParams(LayoutParams.MATCH_PARENT,SINGLE_ITEM_HEIGHT*SCALE - t+SINGLE_ITEM_HEIGHT*Double_Item_Height_index); collectLin.setLayoutParams(collectParams);}@Overridepublic void currentIndex(int scrollY) { printf(); mScrollY = scrollY; t = scrollY; if(scrollY<SINGLE_ITEM_HEIGHT){ Double_Item_Height_index=0; }else if(SINGLE_ITEM_HEIGHT<=scrollY&&scrollY<SINGLE_ITEM_HEIGHT*2){ Double_Item_Height_index=1; }else if(SINGLE_ITEM_HEIGHT*2<=scrollY&&scrollY<SINGLE_ITEM_HEIGHT*3){ Double_Item_Height_index=2; }else if(SINGLE_ITEM_HEIGHT*3<=scrollY&&scrollY<SINGLE_ITEM_HEIGHT*4){ Double_Item_Height_index=3; } if(SINGLE_ITEM_HEIGHT*4<=scrollY){ Double_Item_Height_index=4; if(!isLastItem){ isLastItem = true; disableScrollHeight = scrollY; } } //向上， if(!isDownDirection&&disableScrollHeight>0&&scrollY<=disableScrollHeight){ isLastItem = false; } whichImageAnim(Double_Item_Height_index); android.util.Log.i("","Double_Item_Height_index"+Double_Item_Height_index+isLastItem);}private void reSetHeight(){ rankHot.setLayoutParams(normalParams); rankRich.setLayoutParams(normalParams); rankCharm.setLayoutParams(normalParams); rankSuperStar.setLayoutParams(normalParams); rankWeekStar.setLayoutParams(normalParams);}private void whichImageAnim(int Double_Item_Height_index){ switch (Double_Item_Height_index) { case 0: collectLin = rankHot; expendLin = rankRich; break; case 1: collectLin = rankRich; expendLin = rankCharm; break; case 2: collectLin = rankCharm; expendLin = rankSuperStar; break; case 3: collectLin = rankSuperStar; expendLin = rankWeekStar; break; default: break; }}@Overridepublic void onaction_Up(boolean isUp) { mScrollView.scrollTo((int)(mScrollView.getX()), SINGLE_ITEM_HEIGHT*Double_Item_Height_index);//mPostion printf(); if(Double_Item_Height_index==0){ findViewById(R.id.id_rank_hot_imgs).setVisibility(View.VISIBLE); }else if(Double_Item_Height_index==1){ findViewById(R.id.id_rank_rich_imgs).setVisibility(View.VISIBLE); }else if(Double_Item_Height_index==2){ findViewById(R.id.id_rank_charm_imgs).setVisibility(View.VISIBLE); }else if(Double_Item_Height_index==3){ findViewById(R.id.id_rank_superstar_imgs).setVisibility(View.VISIBLE); }else if(Double_Item_Height_index==4){ findViewById(R.id.id_rank_weekstar_imgs).setVisibility(View.VISIBLE); }}@Overridepublic void onaction_Down() { // TODO Auto-generated method stub findViewById(R.id.id_rank_hot_imgs).setVisibility(View.INVISIBLE); findViewById(R.id.id_rank_rich_imgs).setVisibility(View.INVISIBLE); findViewById(R.id.id_rank_charm_imgs).setVisibility(View.INVISIBLE); findViewById(R.id.id_rank_superstar_imgs).setVisibility(View.INVISIBLE); findViewById(R.id.id_rank_weekstar_imgs).setVisibility(View.INVISIBLE);}private void printf(){ ////rankHot,rankRich,rankCharm,rankSuperStar,rankWeekStar android.util.Log.i("","____rank1 height"+rankHot.getHeight()+":scroll__"+mScrollY); android.util.Log.i("","____rank2 height"+rankRich.getHeight()+":scroll__"+mScrollY); android.util.Log.i("","____rank3 height"+rankCharm.getHeight()+":scroll__"+mScrollY); android.util.Log.i("","____rank4 height"+rankSuperStar.getHeight()+":scroll__"+mScrollY); android.util.Log.i("","____rank5 height"+rankWeekStar.getHeight()+":scroll__"+mScrollY);}@Overridepublic void onClick(View v) { // TODO Auto-generated method stub Intent intent=null; switch (v.getId()) { case R.id.id_rank_hot: //红人榜 intent = new Intent(this, RankItemActivity.class); intent.putExtra("rank", R.layout.layout_rank_activity_hot); break; case R.id.id_rank_rich: //富豪榜 intent = new Intent(this, RankItemActivity.class); intent.putExtra("rank", R.layout.layout_rank_activity_rich); break; case R.id.id_rank_charm: //魅力榜 intent = new Intent(this, RankItemActivity.class); intent.putExtra("rank", R.layout.layout_rank_activity_charm); break; case R.id.id_rank_superstar: //超星榜 intent = new Intent(this, RankItemActivity.class); intent.putExtra("rank", R.layout.layout_rank_activity_superstar); break; case R.id.id_rank_weekstar: //周星榜 intent = new Intent(this, RankItemActivity.class); intent.putExtra("rank", R.layout.layout_rank_activity_weekstar); break; default: break; } startActivity(intent);}private void requestTopThreeHead() { final String rankId = RankAPI.RANGE_DAY_ID; RankAPI.rankStar(rankId, 3).execute(new BaseRequestCallback<RankStarResult>() { @Override public void onRequestSucceed(RankStarResult rankStarResult) { if(rankStarResult.getData().size()<3){ return; } ImageView tempImage; RankStarResult.Data tempData; int[] imgIds = {R.id.id_img_hot_head_first,R.id.id_img_hot_head_sencond,R.id.id_img_hot_head_third}; for(int i=0;i<3;i++){ tempData =rankStarResult.getData().get(i); tempImage = (ImageView) findViewById(imgIds[i]); ImageUtils.requestImage(tempImage, tempData.getPicUrl(),Config.COMMON_ICON_WIDTH_DP, Config.COMMON_ICON_HEIGHT_DP, R.drawable.default_user_bg); } } @Override public void onRequestFailed(RankStarResult rankWealthResult) { } }); RankAPI.rankUser(rankId, 3).execute(new BaseRequestCallback<RankWealthResult>() { @Override public void onRequestSucceed(RankWealthResult rankWealthResult) { if(rankWealthResult.getDataList().size()<3){ return; } ImageView tempImage; RankWealthResult.Data tempData; int[] imgIds = {R.id.id_img_rich_head_first,R.id.id_img_rich_head_sencond,R.id.id_img_rich_head_third}; for(int i=0;i<3;i++){ tempData =rankWealthResult.getDataList().get(i); tempImage = (ImageView) findViewById(imgIds[i]); ImageUtils.requestImage(tempImage, tempData.getPicUrl(),Config.COMMON_ICON_WIDTH_DP, Config.COMMON_ICON_HEIGHT_DP, R.drawable.default_user_bg); } } @Override public void onRequestFailed(RankWealthResult rankWealthResult) { } }); RankAPI.featherUser(rankId, 3).execute(new BaseRequestCallback<RankStarResult>() { @Override public void onRequestSucceed(RankStarResult rankStarResult) { if(rankStarResult.getData().size()<3){ return; } ImageView tempImage; RankStarResult.Data tempData; int[] imgIds = {R.id.id_img_charm_head_first,R.id.id_img_charm_head_sencond,R.id.id_img_charm_head_third}; for(int i=0;i<3;i++){ tempData =rankStarResult.getData().get(i); tempImage = (ImageView) findViewById(imgIds[i]); ImageUtils.requestImage(tempImage, tempData.getPicUrl(),Config.COMMON_ICON_WIDTH_DP, Config.COMMON_ICON_HEIGHT_DP, R.drawable.default_user_bg); } } @Override public void onRequestFailed(RankStarResult rankWealthResult) { } }); RankAPI.superGiftWeekRank(3).execute(new BaseRequestCallback<RankGiftStarResult>() { @Override public void onRequestSucceed(RankGiftStarResult rankGiftStarResult) { if(rankGiftStarResult.getData().size()<3){ return; } ImageView tempImage; RankGiftStarResult.Data tempData; int[] imgIds = {R.id.id_img_superstar_head_first,R.id.id_img_superstar_head_sencond,R.id.id_img_superstar_head_third}; for(int i=0;i<3;i++){ tempData =rankGiftStarResult.getData().get(i); tempImage = (ImageView) findViewById(imgIds[i]); ImageUtils.requestImage(tempImage, tempData.getGiftPicUrl(),Config.COMMON_ICON_WIDTH_DP, Config.COMMON_ICON_HEIGHT_DP, R.drawable.default_user_bg); } } @Override public void onRequestFailed(RankGiftStarResult rankGiftStarResult) { } }); RankAPI.giftWeekRank(3).execute(new BaseRequestCallback<RankGiftStarResult>() { @Override public void onRequestSucceed(RankGiftStarResult rankGiftStarResult) { if(rankGiftStarResult.getData().size()<3){ return; } ImageView tempImage; RankGiftStarResult.Data tempData; int[] imgIds = {R.id.id_img_weekstar_head_first,R.id.id_img_weekstar_head_sencond,R.id.id_img_weekstar_head_third}; for(int i=0;i<3;i++){ tempData =rankGiftStarResult.getData().get(i); tempImage = (ImageView) findViewById(imgIds[i]); ImageUtils.requestImage(tempImage, tempData.getGiftPicUrl(),Config.COMMON_ICON_WIDTH_DP, Config.COMMON_ICON_HEIGHT_DP, R.drawable.default_user_bg); } } @Override public void onRequestFailed(RankGiftStarResult rankGiftStarResult) { } });}} 1 0
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