碰到一個需求，掃描wifi，然后把掃到的wifi顯示在list中，但是掃出來的wifi總是重復，為了實現去重效果，把list遍歷，存儲成map，然后利用map自身的特性，達到去重的目的，然后拿到不重復的map wifi列表，然后再次遍歷map，把符合條件的wifi信息，存儲到新的list中，然后展示這個list，可以實現wifi列表實時掃描顯示
step1:

package com.example.demoanalyticimport android.os.Bundle import android.support.v7.app.AppCompatActivity import android.text.TextUtils import android.util.Logclass MapTestActivity : AppCompatActivity() {// private HashMap<String, StudentBean> map2 = new HashMap<>();private var map2: HashMap<String, StudentBean> = HashMap<String, StudentBean>()private var wifiList = mutableListOf<StudentBean>()private val wifi = "mindor-"override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)/*map2.put("1", mStudentBean);map2.put("2", mStudentBean2);* */val mStudentBean = StudentBean()val mStudentBean2 = StudentBean()val mStudentBean3 = StudentBean()mStudentBean.age = 18mStudentBean.name = "郭靖"mStudentBean2.age = 22mStudentBean2.name = "楊過"mStudentBean3.age = 32mStudentBean3.name = "黃蓉"map2["mindor-001"] = mStudentBeanmap2["mindor-002"] =mStudentBean2map2["608"] =mStudentBean3Log.e("TAG", "$map2")/*if (!list.isEmpty()) {list.clear();}* */if (wifiList.isNotEmpty()){wifiList.clear()}val iter: Iterator<String> = map2.keys.iterator()while (iter.hasNext()) {val key = iter.next()Log.e("TAG", "key:$key")/* if (TextUtils.equals(key, "1")) {map2?.let {it[key]?.let { it1 -> wifiList.add(it1) }}}boolean isData = connectedWifiInfo.getSSID().contains(WIFI_NAME);*/if (key.contains(wifi)){map2?.let {it[key]?.let { it1 -> wifiList.add(it1) }}}}Log.e("TAG", "key:$wifiList")}}

step2:

package com.example.demoanalytic;public class StudentBean {private String name;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;} }

step3:測試 java代碼

package com.example.demoanalytic;import android.net.wifi.ScanResult; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v7.app.AppCompatActivity; import android.text.TextUtils; import android.util.Log;import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List;public class MapThreeActivity extends AppCompatActivity {private CacheMap<String, StudentBean> cacheMap = new CacheMap<>();private CacheMap<String, String> map = new CacheMap<>();private HashMap<String, StudentBean> map2 = new HashMap<>();private List<StudentBean> list;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);list = new ArrayList<>();StudentBean mStudentBean = new StudentBean();mStudentBean.setName("張飛");mStudentBean.setAge(18);StudentBean mStudentBean2 = new StudentBean();mStudentBean2.setName("關羽");mStudentBean2.setAge(21);map2.put("1", mStudentBean);map2.put("2", mStudentBean2);if (!list.isEmpty()) {list.clear();}Iterator<String> iter = map2.keySet().iterator();while (iter.hasNext()) {String key = iter.next();Log.e("TAG", "key:" + key);if (TextUtils.equals(key, "1")) {list.add(map2.get(key));}}Log.e("TAG", "list:" + list);} }

總結

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