Android高仿百度地图公交与位置建议搜索（四）

Android高仿百度地图公交与位置建议搜索

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最近自己在开发一个Android的app，由于需要主动搜索位置以及公交信息，所以想先借鉴一下百度地图的位置公交搜索模块，姑且先模仿百度地图来实现。

1、UI布局文件如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/common_background_color"
android:orientation="vertical" >

<include
android:id="@+id/common_search_action_bar"
layout="@layout/baidu_search_action_bar" />

<ListView
android:id="@+id/lv_position_list"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>

</LinearLayout>

其中Include是自己写的一个共同的搜索模块的View，大家可以根据自己的具体项目来替换。

2、Activity中代码如下：

package com.remind.ui;

import java.util.ArrayList;
import java.util.List;

import com.baidu.mapapi.search.core.CityInfo;
import com.baidu.mapapi.search.core.PoiInfo;
import com.baidu.mapapi.search.core.PoiInfo.POITYPE;
import com.baidu.mapapi.search.core.SearchResult;
import com.baidu.mapapi.search.poi.OnGetPoiSearchResultListener;
import com.baidu.mapapi.search.poi.PoiDetailResult;
import com.baidu.mapapi.search.poi.PoiResult;
import com.baidu.mapapi.search.poi.PoiSearch;
import com.baidu.mapapi.search.sug.OnGetSuggestionResultListener;
import com.baidu.mapapi.search.sug.SuggestionResult;
import com.baidu.mapapi.search.sug.SuggestionSearch;
import com.baidu.mapapi.search.sug.SuggestionSearchOption;
import com.mr.remind.R;
import com.remind.adapter.PoiResultAdapter;
import com.remind.bean.MrPoiResult;
import com.remind.config.Constant;
import com.remind.db.AlarmColumn;
import com.remind.db.DBHelper;
import com.remind.db.PoiHistoryColumn;
import com.remind.utils.LogUtils;
import com.remind.widget.ClearEditText;

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;

/**
* 搜索细节的Activity;
* @author Render
*/
public class SearchDetailActivity extends Activity implements OnGetSuggestionResultListener{

private static final String TAG = "SearchDetailActivity";

private SuggestionSearch mSuggestionSearch = null;   //百度地图建议搜索对象;
private ClearEditText mEditText;                     //自定义的一个Edit控件，也可以用标准的EditView替代.
private ListView mListView;
private PoiResultAdapter mPoiResultAdapter=null; //自定义的ListView适配器对象。
private List<MrPoiResult> mPoiResults=null;      //查询后的结果数据链表;其中MrPoiResult是自定义的Bean对象。
        private String mSearchName;

@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search_detail);

initView();
initData();
}

private void initView(){

mEditText=(ClearEditText) findViewById(R.id.et_search);
mListView=(ListView) findViewById(R.id.lv_position_list);
}

private void initData(){

mPoiResults=new ArrayList<MrPoiResult>();
mPoiResultAdapter=new PoiResultAdapter(this, mPoiResults);
mListView.setAdapter(mPoiResultAdapter);

mSuggestionSearch = SuggestionSearch.newInstance();
mSuggestionSearch.setOnGetSuggestionResultListener(this);

mEditText.addTextChangedListener(new TextWatcher() {

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {

}

@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {

}

@Override
public void afterTextChanged(Editable s) {

mSearchName=mEditText.getText().toString();
excuteSuggestionSearch();
}
});
}

/**
* 开始执行建议搜索;
*/
private void excuteSuggestionSearch(){

mPoiResults.clear();

//清空链表;
if(mSearchName.equals("")||mSearchName==null){
mPoiResultAdapter.updateListView(mPoiResults,null);
return;
}

//根据输入的名称和城市进行建议搜索，建议搜索很强大，即使固定了城市，也可以搜索到别的地方。
mSuggestionSearch
.requestSuggestion((new SuggestionSearchOption())
.keyword(mSearchName).city(Constant.city));

}

@Override
public void onGetSuggestionResult(SuggestionResult res) {

if (res == null || res.getAllSuggestions() == null) {
return;
}

for (SuggestionResult.SuggestionInfo info : res.getAllSuggestions()) {
if (info.key != null){
MrPoiResult poiResult=new MrPoiResult();

//记录搜索到的城市，名称和地区;
poiResult.setCity(info.city);
poiResult.setName(info.key);
poiResult.setAddress(info.city+info.district);

mPoiResults.add(poiResult);
}
}
mPoiResultAdapter.updateListView(mPoiResults,mSearchName);
}

@Override
protected void onDestroy() {

mSuggestionSearch.destroy();
super.onDestroy();
}

@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
}
}

上文的Activity主要是进行简单的建议搜索，并把搜索的结果显示在ListVIew中，接下来我们看看ListView中的适配器对象，由于在项目中我们会经常用到适配器对象，因此这里把适配器对象写成了一个模板基类，先看看基类适配器对象。

3、适配器基类对象

package com.remind.adapter.base;

import java.util.LinkedList;
import java.util.List;

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public abstract class AdapterBase<T> extends BaseAdapter {

private final List<T> mList = new LinkedList<T>();

public List<T> getList(){
return mList;
}

public void appendToList(List<T> list) {
if (list == null) {
return;
}
mList.addAll(list);
notifyDataSetChanged();
}

public void appendToTopList(List<T> list) {
if (list == null) {
return;
}
mList.addAll(0, list);
notifyDataSetChanged();
}

public void clear() {
mList.clear();
notifyDataSetChanged();
}
@Override
public int getCount() {

if(mList!=null){
return mList.size();
}
return 0;
}

@Override
public Object getItem(int position) {
if(position > mList.size()-1){
return null;
}
return mList.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (position == getCount() - 1) {
onReachBottom();
}
return getExView(position, convertView, parent);
}

// 两个基类对象，由子类进行扩展;
protected abstract View getExView(int position, View convertView, ViewGroup parent);
protected abstract void onReachBottom();
}

4、ListView中的适配器对象，代码如下：

package com.remind.adapter;

import java.util.List;

import android.content.Context;
import android.graphics.Color;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ForegroundColorSpan;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.mr.remind.R;
import com.remind.adapter.base.AdapterBase;
import com.remind.bean.MrPoiResult;

public class PoiResultAdapter extends AdapterBase<MrPoiResult>{

private Context ct;
private ViewHolder viewHolder=null;
private String mSearchKey;        //搜索的关键字对象;

public PoiResultAdapter(Context ct,List<MrPoiResult> postions){
this.ct=ct;
appendToList(postions);
}

public void updateListView(List<MrPoiResult> datas,String searchKey){

mSearchKey=searchKey;

clear();
appendToList(datas);
notifyDataSetChanged();
}

static class ViewHolder {

ImageView imageView;
TextView tvName;
TextView tvAddress;
}

@Override
protected View getExView(int position, View convertView, ViewGroup parent) {

MrPoiResult poiResult=getList().get(position);

if (convertView == null) {

convertView = LayoutInflater.from(ct).inflate(R.layout.item_poi_result, null);
viewHolder = new ViewHolder();

viewHolder.imageView = (ImageView) convertView.findViewById(R.id.iv_postion_icon);
viewHolder.tvName=(TextView)convertView.findViewById(R.id.tv_position_name);
viewHolder.tvAddress=(TextView)convertView.findViewById(R.id.tv_position_address);

convertView.setTag(viewHolder);

} else{
viewHolder = (ViewHolder) convertView.getTag();
}

//该部分主要是针对于搜索的结果，用不同的颜色标记出和关键字相同的部分。
String name=poiResult.getName();
int nBegIndex=name.indexOf(mSearchKey);
int nEndIndex=nBegIndex+mSearchKey.length();

if(nBegIndex!=-1)
{
//设置指定位置文字的颜色
SpannableStringBuilder style=new SpannableStringBuilder(name);
style.setSpan(new ForegroundColorSpan(Color.rgb(118, 173, 255)),
nBegIndex,nEndIndex,Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
viewHolder.tvName.setText(style);
}

//下面部分主要是对于如果搜索到的地址为空时，把搜索的名字动态居中显示。
if(poiResult.getAddress()==null||poiResult.getAddress().equals("")){

RelativeLayout.LayoutParams lParams=
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);

lParams.addRule(RelativeLayout.CENTER_VERTICAL);
viewHolder.tvName.setLayoutParams(lParams);
viewHolder.tvAddress.setText("");

}else{

RelativeLayout.LayoutParams lParams=
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);

lParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
viewHolder.tvName.setLayoutParams(lParams);
viewHolder.tvAddress.setText(poiResult.getAddress());
}

return convertView;
}

@Override
protected void onReachBottom() {

}
}

5、建议搜索结果如下，分别进行了位置搜索和公交搜索，结果如下：