近期项目比较忙，今日才有时间给大家分享android的一些实用的知识~
what is getLocationInWindow
android中一种获取view坐标的方法，获取在当前窗口内的绝对坐标。
int[] location = new int[2] ;view.getLocationInWindow(location);解释：location[0] -----> x坐标location[1] -----> y坐标对比
android中获取view坐标的方法有两种：
- getLocationInWindow
- 获取在当前窗口内的绝对坐标
- getLocationOnScreen
- 获取在整个屏幕内的绝对坐标
- 从屏幕顶端算起，包括了通知栏的高度
踩过的坑
在onCreate里面调用，会得到location[0]和location[1]的值均为空，这是因为UI控件还没加载好的原因。所以我们可以使用view.post(runnable)方法去获取或者在onWindowFocusChanged(boolean hasFocus)方法中获取。
使用案例
案例效果图如下：
核心代码分析
首先我们需要保存顶部Tab滑动各item宽度坐标，代码如下：
/** * 保存症状详情顶部tab横向宽度坐标 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param * @return */ private void saveSymptomDetailHorizontalWidth() { int[] location = new int[2]; for (int i = 0; i < symptomDetailContainerLy.getChildCount(); i++) { getSingleNavigation(i).getLocationInWindow(location); symptomDetailHorizontalWidth[i] = location[0]; } }复制代码 然后保存症状详情滑动高度坐标，代码如下：
/** * 保存症状详情滑动高度坐标 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param * @return */ private void savesymtomDetailScvHeight() { // 症状详情 final int[] symptomModuleLoc = new int[2]; final int[] symptomLocation = new int[2]; // 症状模块 symptomModuleLy.post(new Runnable() { @Override public void run() { symptomModuleLy.getLocationInWindow(symptomModuleLoc); symtomDetailScvHeight[0] = 0; } }); // 病因模块 pathogenyModuleLy.post(new Runnable() { @Override public void run() { pathogenyModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[1] = symptomLocation[1] - symptomModuleLoc[1]; } }); // 检查模块 checkoutModuleLy.post(new Runnable() { @Override public void run() { checkoutModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[2] = symptomLocation[1] - symptomModuleLoc[1]; } }); // 诊断模块 diagnoseModuleLy.post(new Runnable() { @Override public void run() { diagnoseModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[3] = symptomLocation[1] -symptomModuleLoc[1]; } }); // 预防模块 preventModuleLy.post(new Runnable() { @Override public void run() { preventModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[4] = symptomLocation[1] - symptomModuleLoc[1]; } }); foodTreatModuleLy.post(new Runnable() { @Override public void run() { // 食疗模块 foodTreatModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[5] = symptomLocation[1] - symptomModuleLoc[1]; } }); }复制代码 接着设置滑动监听、点击顶部Tab事件，代码如下：
/** * 症状详情顶部tab横向监听 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param * @return */ class OnSymtomHorizontalScClickedListener implements View.OnClickListener { @Override public void onClick(View view) { isTopClick = true; setSymtomHorizontalCurrentPostion(view, true, 0, 0); } } @Override protected void registerListener() { // 退出当前页面 findViewById(R.id.iv_actionbar_back).setOnClickListener(this); // 设置滑动监听 if (symptomDetailScv != null) symptomDetailScv.setScrollViewListener(new ObservableScrollView.ScrollViewListener() { @Override public void onScrollChanged(ObservableScrollView scrollView, int x, int y, int oldx, int oldy, int oritention) { if (isTopClick) { isTopClick = false; return; } // 症状详情 // 如果症状详情顶部tab横向宽度坐标或者症状详情滑动高度坐标则返回 if (symtomDetailScvHeight == null || symptomDetailHorizontalWidth == null) return; if (y >= symtomDetailScvHeight[0] && y < symtomDetailScvHeight[1]) { // 症状 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(0), false, symptomDetailHorizontalWidth[0], y); } else if (y >= symtomDetailScvHeight[1] && y < symtomDetailScvHeight[2]) { // 病因 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(1), false, symptomDetailHorizontalWidth[1], y); } else if (y >= symtomDetailScvHeight[2] && y < symtomDetailScvHeight[3]) { // 检查 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(2), false, symptomDetailHorizontalWidth[2], y); } else if (y >= symtomDetailScvHeight[3] && y < symtomDetailScvHeight[4]) { // 诊断 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(3), false, symptomDetailHorizontalWidth[3], y); } else if (y >= symtomDetailScvHeight[4] && y < symtomDetailScvHeight[5]) { // 预防 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(4), false, symptomDetailHorizontalWidth[4], y); } else if (y >= symtomDetailScvHeight[5]) { // 食疗 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(5), false, symptomDetailHorizontalWidth[5], y); } } }); }复制代码 最后设置顶部Tab位置，代码如下：
/** * 设置症状详情顶部tab位置 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param view * @param fromClick 是否点击 * @param x x坐标 * @param y y坐标 * @return */ public void setSymtomHorizontalCurrentPostion(View view, boolean fromClick, int x, int y){ // 如果不是点击事件并横向滑动控件不为空则滑动到指定坐标 if (!fromClick && symptomDetailHscv != null) { symptomDetailHscv.scrollTo(x, y); } if (view == null){ return; } if (view.getTag() == null) return; // 获取当前位置 int position = (Integer) view.getTag(); // 如果当前位置非上次位置 if (lastPosition != position){ // 如果顶部tab动态加载容器为空，则重新实例化 if (symptomDetailContainerLy == null) { // 顶部tab动态加载容器 symptomDetailContainerLy = (LinearLayout) findViewById(R.id.ly_symptom_detail_container); } // 设置上次位置蓝色下滑线不可见 getNavigationImageView(lastPosition).setVisibility(View.INVISIBLE); // 设置上次位置字体颜色为黑色 getNavigationTextView(lastPosition).setTextColor( getResources().getColor(R.color.text_color_black)); // 设置当前位置蓝色下划线可见 getNavigationImageView(position).setVisibility(View.VISIBLE); // 设置当前位置字体颜色为蓝色 getNavigationTextView(position).setTextColor( getResources().getColor(R.color.title_color)); } lastPosition = position; if (symptomDetailScv != null && fromClick) { symptomDetailScv.scrollTo(0, symtomDetailScvHeight[position]); } }复制代码 症状详情页面完整代码如下：
package cn.jianke.getlocationinwindowdemo.module.activity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.widget.HorizontalScrollView;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.Toast;import cn.jianke.getlocationinwindowdemo.R;import cn.jianke.getlocationinwindowdemo.httprequest.ApiCallback;import cn.jianke.getlocationinwindowdemo.httprequest.api.ApiSymptomDetail;import cn.jianke.getlocationinwindowdemo.httprequest.httpresponse.SymptomDetailResponse;import cn.jianke.getlocationinwindowdemo.module.util.HTMLSpirit;import cn.jianke.getlocationinwindowdemo.module.util.StringUtil;import cn.jianke.getlocationinwindowdemo.module.util.Unicode2String;import cn.jianke.getlocationinwindowdemo.module.widget.ObservableScrollView;import static cn.jianke.getlocationinwindowdemo.module.activity.MainActivity.SYMPTOM_ID;/** * @className: SymptomDetailActivity * @classDescription: 症状详情 * @author: leibing * @createTime: 2016/10/29 */public class SymptomDetailActivity extends BaseActivity implements View.OnClickListener{ // 症状id private String id = ""; // 顶部横向滑动控件 private HorizontalScrollView symptomDetailHscv; // 顶部tab动态加载容器 private LinearLayout symptomDetailContainerLy; // 滑动控件 private ObservableScrollView symptomDetailScv; // 症状模块 private LinearLayout symptomModuleLy; // 症状标题 private TextView symptomTitleTv; // 症状内容 private TextView symptomContentTv; // 病因模块 private LinearLayout pathogenyModuleLy; // 病因内容 private TextView pathogenyContentTv; // 检查模块 private LinearLayout checkoutModuleLy; // 检查内容 private TextView checkoutContentTv; // 诊断模块 private LinearLayout diagnoseModuleLy; // 诊断内容 private TextView diagnoseContentTv; // 预防模块 private LinearLayout preventModuleLy; // 预防内容 private TextView preventContentTv; // 食疗模块 private LinearLayout foodTreatModuleLy; // 食疗内容 private TextView foodTreatContentTv; // 症状详情数据 private SymptomDetailResponse symptomDetailResponse; // 症状详情顶部tab横向宽度坐标 private final int[] symptomDetailHorizontalWidth = new int[6]; // 症状详情滑动高度坐标 private final int[] symtomDetailScvHeight = new int[6]; // 是否顶部点击事件 private boolean isTopClick = false; // 上次点击点顶部tab item的位置 private int lastPosition = 0; // 症状详情api private ApiSymptomDetail mApiSymptomDetail; @Override protected void setContentView() { // 指定布局 setContentView(R.layout.activity_symptom_detail); } @Override protected void initView() { // 滑动控件 symptomDetailScv = (ObservableScrollView) findViewById(R.id.scv_symptom_detail); // 顶部横向滑动控件 symptomDetailHscv = (HorizontalScrollView) findViewById(R.id.hscv_symptom_detail); // 顶部tab动态加载容器 symptomDetailContainerLy = (LinearLayout) findViewById(R.id.ly_symptom_detail_container); // 症状模块 symptomModuleLy = (LinearLayout) findViewById(R.id.ly_symptom_module); // 症状标题 symptomTitleTv = (TextView) findViewById(R.id.tv_symptom_title); // 症状内容 symptomContentTv = (TextView) findViewById(R.id.tv_symptom_content); // 病因模块 pathogenyModuleLy = (LinearLayout) findViewById(R.id.ly_pathogeny_module); // 病因内容 pathogenyContentTv = (TextView) findViewById(R.id.tv_pathogeny_content); // 检查模块 checkoutModuleLy = (LinearLayout) findViewById(R.id.ly_checkout_module); // 检查内容 checkoutContentTv = (TextView) findViewById(R.id.tv_checkout_content); // 诊断模块 diagnoseModuleLy = (LinearLayout) findViewById(R.id.ly_diagnose_module); // 诊断内容 diagnoseContentTv = (TextView) findViewById(R.id.tv_diagnose_content); // 预防模块 preventModuleLy = (LinearLayout) findViewById(R.id.ly_prevent_module); // 预防内容 preventContentTv = (TextView) findViewById(R.id.tv_prevent_content); // 食疗模块 foodTreatModuleLy = (LinearLayout) findViewById(R.id.ly_food_treat_module); // 食疗内容 foodTreatContentTv = (TextView) findViewById(R.id.tv_food_treat_content); // 获取意图传值 getIntentData(); // 初始化症状详情api mApiSymptomDetail = new ApiSymptomDetail(); // 初始化症状详情顶部tab initSymptomDetailHorizontalTab(); } @Override protected void registerListener() { // 退出当前页面 findViewById(R.id.iv_actionbar_back).setOnClickListener(this); // 设置滑动监听 if (symptomDetailScv != null) symptomDetailScv.setScrollViewListener(new ObservableScrollView.ScrollViewListener() { @Override public void onScrollChanged(ObservableScrollView scrollView, int x, int y, int oldx, int oldy, int oritention) { if (isTopClick) { isTopClick = false; return; } // 症状详情 // 如果症状详情顶部tab横向宽度坐标或者症状详情滑动高度坐标则返回 if (symtomDetailScvHeight == null || symptomDetailHorizontalWidth == null) return; if (y >= symtomDetailScvHeight[0] && y < symtomDetailScvHeight[1]) { // 症状 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(0), false, symptomDetailHorizontalWidth[0], y); } else if (y >= symtomDetailScvHeight[1] && y < symtomDetailScvHeight[2]) { // 病因 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(1), false, symptomDetailHorizontalWidth[1], y); } else if (y >= symtomDetailScvHeight[2] && y < symtomDetailScvHeight[3]) { // 检查 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(2), false, symptomDetailHorizontalWidth[2], y); } else if (y >= symtomDetailScvHeight[3] && y < symtomDetailScvHeight[4]) { // 诊断 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(3), false, symptomDetailHorizontalWidth[3], y); } else if (y >= symtomDetailScvHeight[4] && y < symtomDetailScvHeight[5]) { // 预防 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(4), false, symptomDetailHorizontalWidth[4], y); } else if (y >= symtomDetailScvHeight[5]) { // 食疗 setSymtomHorizontalCurrentPostion(symptomDetailContainerLy.getChildAt(5), false, symptomDetailHorizontalWidth[5], y); } } }); } @Override protected void getData() { if (mApiSymptomDetail != null){ // 请求数据 mApiSymptomDetail.getSymptomDetail(id, SymptomDetailActivity.this, new ApiCallback () { @Override public void onSuccess(SymptomDetailResponse response) { // 更新UI updateSymptomUI(response); } @Override public void onError(String err_msg) { Toast.makeText(SymptomDetailActivity.this, err_msg, Toast.LENGTH_SHORT).show(); } @Override public void onFailure() { Toast.makeText(SymptomDetailActivity.this, "网络不给力", Toast.LENGTH_SHORT).show(); } }); } } /** * 更新症状详情UI * @author leibing * @createTime 2016/10/08 * @lastModify 2016/10/08 * @param response 症状详情数据 * @return */ private void updateSymptomUI(SymptomDetailResponse response) { // 更新症状详情数据 symptomDetailResponse = response; // 症状 if (StringUtil.isNotEmpty(symptomDetailResponse.namecn) && StringUtil.isNotEmpty(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.summarize)))){ // 症状标题 symptomTitleTv.setText(symptomDetailResponse.namecn); // 症状内容 symptomContentTv.setText(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.summarize))); } if (StringUtil.isNotEmpty(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.pathogeny)))){ // 病因内容 pathogenyContentTv.setText(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.pathogeny))); } if (StringUtil.isNotEmpty(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.diagnoses)))){ // 检查内容 checkoutContentTv.setText(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.diagnoses))); } if (StringUtil.isNotEmpty(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.differential)))){ // 诊断内容 diagnoseContentTv.setText(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.differential))); } if (StringUtil.isNotEmpty(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.prevent)))){ // 预防内容 preventContentTv.setText(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.prevent))); } if (StringUtil.isNotEmpty(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.foodtreat)))){ // 食疗内容 foodTreatContentTv.setText(HTMLSpirit.removeHtmlTag( Unicode2String.decodeUnicode(symptomDetailResponse.foodtreat))); } // 设置高度和宽度 savesymtomDetailScvHeight(); saveSymptomDetailHorizontalWidth(); } /** * 获取意图传值 * @author leibing * @createTime 2016/10/29 * @lastModify 2016/10/29 * @param * @return */ private void getIntentData() { // 获取意图传值 Bundle bundle = getIntent().getExtras(); if (bundle != null){ // 症状id id = bundle.getString(SYMPTOM_ID, ""); } } /** * 初始化症状详情顶部tab * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param * @return */ private void initSymptomDetailHorizontalTab() { // 获取顶部滑动item名称 String[] array = getResources().getStringArray( R.array.symptom_detail_navigation_name); // 初始化监听 OnSymtomHorizontalScClickedListener listener = new OnSymtomHorizontalScClickedListener(); for (int i = 0; i < array.length; i++) { // 获取子view View childView = LayoutInflater.from(SymptomDetailActivity.this).inflate( R.layout.check_details_single_navigation_model, null); // 实例化子view控件 TextView titleTv = (TextView) childView.findViewById(R.id.check_details_navigation_textView); // 给子view控件初始化值 titleTv.setText(array[i]); // 子view设置tag childView.setTag(i); // 子view设置监听 childView.setOnClickListener(listener); // 子view添加到父容器 symptomDetailContainerLy.addView(childView); } // 默认为选中第一个 getNavigationImageView(0).setVisibility(View.VISIBLE); getNavigationTextView(0).setTextColor( getResources().getColor(R.color.title_color)); } /** * 设置症状详情顶部tab位置 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param view * @param fromClick 是否点击 * @param x x坐标 * @param y y坐标 * @return */ public void setSymtomHorizontalCurrentPostion(View view, boolean fromClick, int x, int y){ // 如果不是点击事件并横向滑动控件不为空则滑动到指定坐标 if (!fromClick && symptomDetailHscv != null) { symptomDetailHscv.scrollTo(x, y); } if (view == null){ return; } if (view.getTag() == null) return; // 获取当前位置 int position = (Integer) view.getTag(); // 如果当前位置非上次位置 if (lastPosition != position){ // 如果顶部tab动态加载容器为空，则重新实例化 if (symptomDetailContainerLy == null) { // 顶部tab动态加载容器 symptomDetailContainerLy = (LinearLayout) findViewById(R.id.ly_symptom_detail_container); } // 设置上次位置蓝色下滑线不可见 getNavigationImageView(lastPosition).setVisibility(View.INVISIBLE); // 设置上次位置字体颜色为黑色 getNavigationTextView(lastPosition).setTextColor( getResources().getColor(R.color.text_color_black)); // 设置当前位置蓝色下划线可见 getNavigationImageView(position).setVisibility(View.VISIBLE); // 设置当前位置字体颜色为蓝色 getNavigationTextView(position).setTextColor( getResources().getColor(R.color.title_color)); } lastPosition = position; if (symptomDetailScv != null && fromClick) { symptomDetailScv.scrollTo(0, symtomDetailScvHeight[position]); } } /** * 保存症状详情顶部tab横向宽度坐标 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param * @return */ private void saveSymptomDetailHorizontalWidth() { int[] location = new int[2]; for (int i = 0; i < symptomDetailContainerLy.getChildCount(); i++) { getSingleNavigation(i).getLocationInWindow(location); symptomDetailHorizontalWidth[i] = location[0]; } } /** * 保存症状详情滑动高度坐标 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param * @return */ private void savesymtomDetailScvHeight() { // 症状详情 final int[] symptomModuleLoc = new int[2]; final int[] symptomLocation = new int[2]; // 症状模块 symptomModuleLy.post(new Runnable() { @Override public void run() { symptomModuleLy.getLocationInWindow(symptomModuleLoc); symtomDetailScvHeight[0] = 0; } }); // 病因模块 pathogenyModuleLy.post(new Runnable() { @Override public void run() { pathogenyModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[1] = symptomLocation[1] - symptomModuleLoc[1]; } }); // 检查模块 checkoutModuleLy.post(new Runnable() { @Override public void run() { checkoutModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[2] = symptomLocation[1] - symptomModuleLoc[1]; } }); // 诊断模块 diagnoseModuleLy.post(new Runnable() { @Override public void run() { diagnoseModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[3] = symptomLocation[1] -symptomModuleLoc[1]; } }); // 预防模块 preventModuleLy.post(new Runnable() { @Override public void run() { preventModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[4] = symptomLocation[1] - symptomModuleLoc[1]; } }); foodTreatModuleLy.post(new Runnable() { @Override public void run() { // 食疗模块 foodTreatModuleLy.getLocationInWindow(symptomLocation); symtomDetailScvHeight[5] = symptomLocation[1] - symptomModuleLoc[1]; } }); } /** * 症状详情顶部tab横向监听 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param * @return */ class OnSymtomHorizontalScClickedListener implements View.OnClickListener { @Override public void onClick(View view) { isTopClick = true; setSymtomHorizontalCurrentPostion(view, true, 0, 0); } } /** * 根据索引获取顶部滑动栏TextView实例 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param index 索引值 * @return */ private TextView getNavigationTextView(int index) { if (symptomDetailContainerLy == null) return null; return (TextView) symptomDetailContainerLy.getChildAt(index).findViewById( R.id.check_details_navigation_textView); } /** * 根据索引获取顶部滑动栏ImageView实例 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param index 索引值 * @return */ private ImageView getNavigationImageView(int index) { if (symptomDetailContainerLy == null) return null; return (ImageView) symptomDetailContainerLy.getChildAt(index).findViewById( R.id.check_details_navigation_imageView); } /** * 根据索引获取顶部滑动栏View实例 * @author leibing * @createTime 2016/10/19 * @lastModify 2016/10/19 * @param index 索引值 * @return */ private View getSingleNavigation(int index) { if (symptomDetailContainerLy == null) return null; return symptomDetailContainerLy.getChildAt(index); } @Override public void onClick(View view) { switch (view.getId()){ case R.id.iv_actionbar_back: // 退出当前页面 this.finish(); break; default: break; } }}复制代码 项目地址：
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