之前博文《 Android学习笔记之——Content Providers》曾经介绍过将联系人的信息读入，然后显示。其实本博文就很像了hhh
在博文《Android学习笔记之——获取WIFI的RSSI以及名称》已经实现了获取wifi的名称以及其RSSI强度了
目录
定义UI
Mainactivity
参考资料
定义UI
加一个list来显示wifi列表
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/wifi_rssi"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="WiFi RSSI"
android:textAllCaps="false"
/>
<ListView
android:id="@+id/wifi_list_view"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
</LinearLayout>
Mainactivity
出现wifi list
package com.example.wifitest;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private static final int PERMISSIONS_REQUEST_CODE_ACCESS_COARSE_LOCATION = 1;//设置权限之后回调函数中用于区别不同权限回调的自定义常量值
String wifi_name;
int wifi_rssi;
ArrayAdapter<String> adapter;
List<String> WifiList = new ArrayList<>();
// List <ScanResult> list;
WifiManager wifiManager;//想要获得wifi信息就必须要一个WifiManager对象
// List<ScanResult> WifiList = new ArrayList<>();//最终返回的列表
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//定义按键实例
Button button1=(Button) findViewById(R.id.wifi_rssi);
//定义按钮点击事件
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//想要获得wifi信息就必须要一个WifiManager对象
wifiManager= (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);//获取wifi服务
assert wifiManager != null;
//创建WifiInfo对象
WifiInfo wifiInfo=wifiManager.getConnectionInfo();
wifi_name=wifiInfo.getSSID();
//华为手机要通过下面代码才可以获得wifi名称
int networkID=wifiInfo.getNetworkId();
List<WifiConfiguration> configuredNetworks = wifiManager.getConfiguredNetworks();
for (WifiConfiguration wifiConfiguration:configuredNetworks){
if (wifiConfiguration.networkId==networkID){
wifi_name=wifiConfiguration.SSID;
break;
}
}
wifi_rssi=wifiInfo.getRssi();
//通过Toast输出
Toast.makeText(MainActivity.this, "current WIFI:"+"rssi:"+wifi_rssi+"---wifiId:"+wifi_name,Toast.LENGTH_SHORT).show();
}
});
//调用扫描wifi列表。调用的函数会返回wifi列表
//需要权限才可以获取wifi列表
// registerPermission();//里面修改了WifiList
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[] { Manifest.permission.ACCESS_COARSE_LOCATION }, PERMISSIONS_REQUEST_CODE_ACCESS_COARSE_LOCATION);
} else {
getWifiList();//调用上面函数获取wifi列表
}
//获取listview控件实例
ListView listwifiView=(ListView) findViewById(R.id.wifi_list_view);
//设置适配器对应listview
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, WifiList);
listwifiView.setAdapter(adapter);
adapter.notifyDataSetChanged();//并通知刷新一下ListView
}
/////////////////
//调用扫描wifi列表。调用的函数会返回wifi列表
//需要权限才可以获取wifi列表
// registerPermission();//里面修改了WifiList
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[] { Manifest.permission.ACCESS_COARSE_LOCATION }, PERMISSIONS_REQUEST_CODE_ACCESS_COARSE_LOCATION);
} else {
getWifiList();//调用上面函数获取wifi列表
}
//获取listview控件实例
ListView listwifiView=(ListView) findViewById(R.id.wifi_list_view);
//设置适配器对应listview
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, WifiList);
listwifiView.setAdapter(adapter);
adapter.notifyDataSetChanged();//并通知刷新一下ListView
}
//扫描wifi列表
//通过wifiManager获取wifi列表
public void getWifiList() {
//定义一个WifiManager对象
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
List<ScanResult> scanWifiList = wifiManager.getScanResults();
List<ScanResult> wifiList = new ArrayList<>();//最终返回的列表
List <WifiStream> list = new ArrayList<WifiStream>();
if (scanWifiList != null && scanWifiList.size() > 0) {
for (int i = 0; i < scanWifiList.size(); i++) {
ScanResult scanResult = scanWifiList.get(i);
if (!scanResult.SSID.isEmpty()) {//wifi名称不是空的话
String key = scanResult.SSID + " " + scanResult.level;//显示wifi的名称以及其RSSI
list.add(new WifiStream(scanResult.SSID, scanResult.level));
}
}
}
//通过Collections.sort(List , Comparator c)方法来进行排序
//按照rssi来排序
Collections.sort(list,comparator);
//然后将list转为string放入WifiList中
for (int i=0;i<list.size();i++){
String key=list.get(i).WifiStream_name+""+list.get(i).WifiStream_rssi;
WifiList.add(key);//输出key（wifi名称+RSSI）
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == PERMISSIONS_REQUEST_CODE_ACCESS_COARSE_LOCATION) {
getWifiList();
}
}
//按照rssi来排序(小到大排序)
static Comparator<WifiStream> comparator = new Comparator<WifiStream>() {
@Override
public int compare(WifiStream p1 , WifiStream p2 ) {
if( p1.WifiStream_rssi > p2.WifiStream_rssi ){
return 1 ; //正数
}else if ( p1.WifiStream_rssi < p2.WifiStream_rssi) {
return -1 ; //负数
}else {
return 0; //相等为0
}
}
};
// private class SortRssi implements Comparator<WifiStream> {
// @Override
// public int compare(MainActivity.WifiStream o1, MainActivity.WifiStream o2) {
// return o1.WifiStream_rssi-o2.WifiStream_rssi;
// }
// }
}
最终的代码：
package com.example.wifitest;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private static final int PERMISSIONS_REQUEST_CODE_ACCESS_COARSE_LOCATION = 1;//设置权限之后回调函数中用于区别不同权限回调的自定义常量值
String wifi_name;
int wifi_rssi;
//自定义一个数据类型，后面用于存储与排序
public class WifiStream
{
String WifiStream_name;
int WifiStream_rssi;
public WifiStream(String ssid, int level) {
this.WifiStream_name = ssid;
this.WifiStream_rssi = level;
}
}
ArrayAdapter<String> adapter;
List<String> WifiList = new ArrayList<>();
WifiManager wifiManager;//想要获得wifi信息就必须要一个WifiManager对象
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//定义按键实例
Button button1=(Button) findViewById(R.id.wifi_rssi);
//定义按钮点击事件
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//想要获得wifi信息就必须要一个WifiManager对象
wifiManager= (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);//获取wifi服务
assert wifiManager != null;
//创建WifiInfo对象
WifiInfo wifiInfo=wifiManager.getConnectionInfo();
wifi_name=wifiInfo.getSSID();
//华为手机要通过下面代码才可以获得wifi名称
int networkID=wifiInfo.getNetworkId();
List<WifiConfiguration> configuredNetworks = wifiManager.getConfiguredNetworks();
for (WifiConfiguration wifiConfiguration:configuredNetworks){
if (wifiConfiguration.networkId==networkID){
wifi_name=wifiConfiguration.SSID;
break;
}
}
wifi_rssi=wifiInfo.getRssi();
//通过Toast输出
Toast.makeText(MainActivity.this, "current WIFI:"+"rssi:"+wifi_rssi+"---wifiId:"+wifi_name,Toast.LENGTH_SHORT).show();
}
});
/////////////////////////////
//调用扫描wifi列表。调用的函数会返回wifi列表
//需要权限才可以获取wifi列表
// registerPermission();//里面修改了WifiList
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[] { Manifest.permission.ACCESS_COARSE_LOCATION }, PERMISSIONS_REQUEST_CODE_ACCESS_COARSE_LOCATION);
} else {
getWifiList();//调用上面函数获取wifi列表
}
//获取listview控件实例
ListView listwifiView=(ListView) findViewById(R.id.wifi_list_view);
//设置适配器对应listview
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, WifiList);
listwifiView.setAdapter(adapter);
adapter.notifyDataSetChanged();//并通知刷新一下ListView
}
//扫描wifi列表
//通过wifiManager获取wifi列表
public void getWifiList() {
//定义一个WifiManager对象
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
List<ScanResult> scanWifiList = wifiManager.getScanResults();
List<ScanResult> wifiList = new ArrayList<>();//最终返回的列表
List <WifiStream> list = new ArrayList<WifiStream>();
if (scanWifiList != null && scanWifiList.size() > 0) {
for (int i = 0; i < scanWifiList.size(); i++) {
ScanResult scanResult = scanWifiList.get(i);
if (!scanResult.SSID.isEmpty()) {//wifi名称不是空的话
String key = scanResult.SSID + " " + scanResult.level;//显示wifi的名称以及其RSSI
list.add(new WifiStream(scanResult.SSID, scanResult.level));
}
}
}
//通过Collections.sort(List , Comparator c)方法来进行排序
//按照rssi来排序
Collections.sort(list,comparator);
//然后将list转为string放入WifiList中
for (int i=0;i<list.size();i++){
String key=list.get(i).WifiStream_name+""+list.get(i).WifiStream_rssi;
WifiList.add(key);//输出key（wifi名称+RSSI）
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == PERMISSIONS_REQUEST_CODE_ACCESS_COARSE_LOCATION) {
getWifiList();
}
}
//按照rssi来排序(小到大排序。)
static Comparator<WifiStream> comparator = new Comparator<WifiStream>() {
@Override
public int compare(WifiStream p1 , WifiStream p2 ) {
if( p1.WifiStream_rssi > p2.WifiStream_rssi ){
return 1 ; //正数
}else if ( p1.WifiStream_rssi < p2.WifiStream_rssi) {
return -1 ; //负数
}else {
return 0; //相等为0
}
}
};
// private class SortRssi implements Comparator<WifiStream> {
// @Override
// public int compare(MainActivity.WifiStream o1, MainActivity.WifiStream o2) {
// return o1.WifiStream_rssi-o2.WifiStream_rssi;
// }
// }
}
可以按照rssi的大小来排列wifi
参考资料
关于scanResult（https://blog.csdn.net/male09/article/details/70792657）
https://www.jianshu.com/p/bdcec333ba2b
对键值进行排序（https://www.cnblogs.com/avivahe/p/5657071.html）
关于Comparator（https://blog.csdn.net/scgyus/article/details/79454321）
