扫描 20 次的 Wifi 扫描仪答案

【问题标题】：Wifi Scanner which scans 20 times扫描 20 次的 Wifi 扫描仪
【发布时间】：2014-07-26 10:26:33
【问题描述】：

我正在尝试为我的项目制作 wifi 扫描仪，当我点击扫描按钮时它会进行 20 次扫描。当我运行代码时，它会扫描但我不知道它是否扫描了 20 次，并且 RSSI 值/wifi 级别不断变化。在日志中它还说您需要取消注册接收者。

我的 MainActivity.java

package com.example.scanner;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import android.annotation.SuppressLint;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
    WifiManager wifi;
    WifiScanReceiver wifireciever;
    WifiInfo info;
    Button scan, save;
    List<ScanResult> wifilist;
    ListView list;
    String wifis[];
    String name;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);

        list=(ListView)findViewById(R.id.listView1);
        scan=(Button)findViewById(R.id.button1);
        save=(Button)findViewById(R.id.button2);


        scan.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                wifi=(WifiManager)getSystemService(Context.WIFI_SERVICE);

                if (wifi.isWifiEnabled()==false){
                    wifi.setWifiEnabled(true);

                }

                wifireciever = new WifiScanReceiver();
                registerReceiver(wifireciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));                
            }
        });

        save.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                savedata();

            }
        });


    }

    protected void savedata() {
        // TODO Auto-generated method stub
        try {
               File sdcard = Environment.getExternalStorageDirectory();
               File directory = new File(sdcard.getAbsolutePath() + "/WIFI_RESULT");
               directory.mkdirs();
               name = new SimpleDateFormat("yyyy-MM-dd HH mm ss").format(new Date());
               File file = new File(directory,name + "wifi_data.txt");

               FileOutputStream fou = new FileOutputStream(file);

               OutputStreamWriter osw = new OutputStreamWriter(fou);
               try {
                   for (int i =0; i < list.getCount(); i++){
                   osw.append(list.getItemAtPosition(i).toString());
                   }
                   osw.flush();
                   osw.close();
                   Toast.makeText(getBaseContext(), "Saved", Toast.LENGTH_LONG).show();
               } catch (IOException e){
                   e.printStackTrace();
               }
            } catch (FileNotFoundException e){
                e.printStackTrace();
            }

    }

    public class scan_data {
        String ssid;
        String bssid;
        int lvl;
        int count = 0;
    }


    class WifiScanReceiver extends BroadcastReceiver {
          @SuppressLint("UseValueOf")
          public void onReceive(Context c, Intent intent) {

              scan_data[] data = new scan_data[100];

              for (int i=0;i<100;i++){
                  scan_data sdata = new scan_data();
                  data[i]=sdata;
              }

              int a =0;

              for (int i=0;i<20;i++){
                  wifi.startScan();
                  List<ScanResult> wifilist = wifi.getScanResults();

                  if (a<wifilist.size()){
                      a=wifilist.size();
                  }

                  if (i==0){
                      for(int j=0;j<wifilist.size();j++){
                          data[j].ssid=wifilist.get(j).SSID.toString();
                          data[j].bssid=wifilist.get(j).BSSID.toString();
                          data[j].lvl=wifilist.get(j).level;
                          data[j].count++;
                      }
                  }

                  else if (i==19){
                      for (int j=0;j<wifilist.size();j++){
                          if(data[j].bssid.equals(wifilist.get(j).BSSID)){
                              data[j].lvl=data[j].lvl + wifilist.get(j).level;
                              data[j].count++;
                          }

                          data[j].lvl=data[j].lvl/data[j].count;
                      }
                  }

                  else {
                      for (int j=0;j<wifilist.size();j++){
                          if(data[j].bssid.equals(wifilist.get(j).BSSID)){
                              data[j].lvl=data[j].lvl + wifilist.get(j).level;
                              data[j].count++;
                          }
                      }
                  }
              }

              wifis = new String[a];
              for (int i =0; i<a; i++){
                  wifis[i] = ("\n" + data[i].ssid + "\n AP Address" + data[i].bssid + "\n Signal Strength:" + data[i].lvl).toString();
              }
              list.setAdapter(new ArrayAdapter<String>(getApplicationContext(),
                         android.R.layout.simple_list_item_1,wifis));   
          }
    }


    protected void onPause() {
          unregisterReceiver(wifireciever);
          super.onPause();
       }

    protected void onResume() {
          registerReceiver(wifireciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
          super.onResume();
       }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }   
}

日志猫是：

06-05 17:42:43.262: D/dalvikvm(32156): GC_FOR_ALLOC freed 117K, 11% free 6899K/7687K, paused 35ms, total 35ms
06-05 17:42:43.312: I/dalvikvm-heap(32156): Grow heap (frag case) to 13.478MB for 6400016-byte allocation
06-05 17:42:43.412: D/dalvikvm(32156): GC_CONCURRENT freed 1K, 6% free 13148K/13959K, paused 33ms+2ms, total 103ms
06-05 17:42:43.412: D/dalvikvm(32156): WAIT_FOR_CONCURRENT_GC blocked 8ms
06-05 17:42:43.532: D/AbsListView(32156): Get MotionRecognitionManager
06-05 17:42:43.642: D/libEGL(32156): loaded /system/lib/egl/libGLES_rhea.so
06-05 17:42:43.662: D/BRCM_EGL(32156): eglCreateContext() config: 19 context: 0x4a12ca38, VC context 1, Thread 32156
06-05 17:42:43.662: D/BRCM_EGL(32156): eglCreateWindowSurface() surface: 0x4a240960, VC surface: 1, Thread: 32156
06-05 17:42:43.662: D/BRCM_EGL(32156): eglMakeCurrent(0x4a12ca38, 0x4a240960, 0x4a240960) Thread: 32156
06-05 17:42:43.672: D/OpenGLRenderer(32156): Enabling debug mode 0
06-05 17:43:39.937: D/BRCM_EGL(32156): eglMakeCurrent(NULL) Thread: 32156
06-05 17:43:39.937: D/BRCM_EGL(32156): eglDestroySurface() surface: 0x4a240960, android window 0x4908d370, Thread: 32156
06-05 17:43:40.457: D/BRCM_EGL(32156): eglMakeCurrent(0x4a12ca38, 0x4a2cbf60, 0x4a2cbf60) Thread: 32156
06-05 17:43:40.478: D/BRCM_EGL(32156): eglMakeCurrent(NULL) Thread: 32156
06-05 17:43:40.488: D/BRCM_EGL(32156): eglMakeCurrent(0x4a12ca38, 0x4a2cbf60, 0x4a2cbf60) Thread: 32156
06-05 17:43:40.488: D/BRCM_EGL(32156): eglMakeCurrent(NULL) Thread: 32156
06-05 17:43:40.508: E/ActivityThread(32156): Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@41640c78 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.508: E/ActivityThread(32156): android.app.IntentReceiverLeaked: Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@41640c78 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.508: E/ActivityThread(32156):    at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:793)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:593)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1314)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1301)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1295)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:394)
06-05 17:43:40.508: E/ActivityThread(32156):    at com.example.scanner.MainActivity$1.onClick(MainActivity.java:64)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.view.View.performClick(View.java:4262)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.view.View$PerformClick.run(View.java:17421)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.os.Handler.handleCallback(Handler.java:615)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.os.Handler.dispatchMessage(Handler.java:92)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.os.Looper.loop(Looper.java:137)
06-05 17:43:40.508: E/ActivityThread(32156):    at android.app.ActivityThread.main(ActivityThread.java:4947)
06-05 17:43:40.508: E/ActivityThread(32156):    at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:43:40.508: E/ActivityThread(32156):    at java.lang.reflect.Method.invoke(Method.java:511)
06-05 17:43:40.508: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-05 17:43:40.508: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-05 17:43:40.508: E/ActivityThread(32156):    at dalvik.system.NativeStart.main(Native Method)
06-05 17:43:40.518: E/ActivityThread(32156): Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@4167dca8 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.518: E/ActivityThread(32156): android.app.IntentReceiverLeaked: Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@4167dca8 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.518: E/ActivityThread(32156):    at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:793)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:593)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1314)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1301)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1295)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:394)
06-05 17:43:40.518: E/ActivityThread(32156):    at com.example.scanner.MainActivity$1.onClick(MainActivity.java:64)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.view.View.performClick(View.java:4262)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.view.View$PerformClick.run(View.java:17421)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.os.Handler.handleCallback(Handler.java:615)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.os.Handler.dispatchMessage(Handler.java:92)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.os.Looper.loop(Looper.java:137)
06-05 17:43:40.518: E/ActivityThread(32156):    at android.app.ActivityThread.main(ActivityThread.java:4947)
06-05 17:43:40.518: E/ActivityThread(32156):    at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:43:40.518: E/ActivityThread(32156):    at java.lang.reflect.Method.invoke(Method.java:511)
06-05 17:43:40.518: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-05 17:43:40.518: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-05 17:43:40.518: E/ActivityThread(32156):    at dalvik.system.NativeStart.main(Native Method)
06-05 17:43:40.528: E/ActivityThread(32156): Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@416416e0 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.528: E/ActivityThread(32156): android.app.IntentReceiverLeaked: Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@416416e0 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.528: E/ActivityThread(32156):    at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:793)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:593)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1314)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1301)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1295)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:394)
06-05 17:43:40.528: E/ActivityThread(32156):    at com.example.scanner.MainActivity$1.onClick(MainActivity.java:64)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.view.View.performClick(View.java:4262)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.view.View$PerformClick.run(View.java:17421)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.os.Handler.handleCallback(Handler.java:615)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.os.Handler.dispatchMessage(Handler.java:92)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.os.Looper.loop(Looper.java:137)
06-05 17:43:40.528: E/ActivityThread(32156):    at android.app.ActivityThread.main(ActivityThread.java:4947)
06-05 17:43:40.528: E/ActivityThread(32156):    at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:43:40.528: E/ActivityThread(32156):    at java.lang.reflect.Method.invoke(Method.java:511)
06-05 17:43:40.528: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-05 17:43:40.528: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-05 17:43:40.528: E/ActivityThread(32156):    at dalvik.system.NativeStart.main(Native Method)
06-05 17:43:40.538: E/ActivityThread(32156): Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@41641368 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.538: E/ActivityThread(32156): android.app.IntentReceiverLeaked: Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@41641368 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.538: E/ActivityThread(32156):    at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:793)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:593)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1314)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1301)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1295)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:394)
06-05 17:43:40.538: E/ActivityThread(32156):    at com.example.scanner.MainActivity$1.onClick(MainActivity.java:64)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.view.View.performClick(View.java:4262)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.view.View$PerformClick.run(View.java:17421)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.os.Handler.handleCallback(Handler.java:615)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.os.Handler.dispatchMessage(Handler.java:92)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.os.Looper.loop(Looper.java:137)
06-05 17:43:40.538: E/ActivityThread(32156):    at android.app.ActivityThread.main(ActivityThread.java:4947)
06-05 17:43:40.538: E/ActivityThread(32156):    at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:43:40.538: E/ActivityThread(32156):    at java.lang.reflect.Method.invoke(Method.java:511)
06-05 17:43:40.538: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-05 17:43:40.538: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-05 17:43:40.538: E/ActivityThread(32156):    at dalvik.system.NativeStart.main(Native Method)
06-05 17:43:40.548: E/ActivityThread(32156): Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@41640ff0 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.548: E/ActivityThread(32156): android.app.IntentReceiverLeaked: Activity com.example.scanner.MainActivity has leaked IntentReceiver com.example.scanner.MainActivity$WifiScanReceiver@41640ff0 that was originally registered here. Are you missing a call to unregisterReceiver()?
06-05 17:43:40.548: E/ActivityThread(32156):    at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:793)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:593)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1314)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1301)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.app.ContextImpl.registerReceiver(ContextImpl.java:1295)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:394)
06-05 17:43:40.548: E/ActivityThread(32156):    at com.example.scanner.MainActivity$1.onClick(MainActivity.java:64)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.view.View.performClick(View.java:4262)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.view.View$PerformClick.run(View.java:17421)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.os.Handler.handleCallback(Handler.java:615)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.os.Handler.dispatchMessage(Handler.java:92)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.os.Looper.loop(Looper.java:137)
06-05 17:43:40.548: E/ActivityThread(32156):    at android.app.ActivityThread.main(ActivityThread.java:4947)
06-05 17:43:40.548: E/ActivityThread(32156):    at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:43:40.548: E/ActivityThread(32156):    at java.lang.reflect.Method.invoke(Method.java:511)
06-05 17:43:40.548: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-05 17:43:40.548: E/ActivityThread(32156):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-05 17:43:40.548: E/ActivityThread(32156):    at dalvik.system.NativeStart.main(Native Method)

我知道我错过了 unregistorReciever 的东西，但我应该在哪里添加

【问题讨论】：

标签： android android-wifi rssi

【解决方案1】：

你的wifi扫描了20次，显然是因为这个

for (int i=0;i<20;i++){
    wifi.startScan();

你在 for 循环中开始扫描 20 次，为什么？

关于取消注册接收者，可以放在onDestroy()

还有一个注意事项，行

wifi.startScan();

不应放在onReceive() 内它应该放在扫描按钮的 onClick() 处和onReceive() 将被调用，以便您可以获取数据并保存它所以如果你调用 startScan 它会再次触发扫描

而你使用了太多的硬编码尺寸，100 和 20 这些假设是什么？

编辑：

scan_data[] data = null;
int TOTAL_SCANS = 0;
class WifiScanReceiver extends BroadcastReceiver {
          @SuppressLint("UseValueOf")
          public void onReceive(Context c, Intent intent) {
              List<ScanResult> wifilist = wifi.getScanResults();
              data = new scan_data[wifilist .size()];

              int a =0;

             // for (int i=0;i<20;i++){ //DELETE THE LOOP
                  if (a<wifilist.size()){
                      a=wifilist.size();
                  }

              for(int r=0;r<wifilist.size();r++){
                  data[r] = new scan_date();
                  data[r].ssd=wifilist.get(r).ssd();//check syntax here ... just sample
              }


              //at end of onReceive()
              if(TOTAL_SCANS < 20){
                  ++TOTAL_SCANS;
                  wifi.startScan();
              }else{
                  System.out.println(" Scan Completed [" + TOTAL_SCANS  + "] times.");
                  //you can unregisterReceiver here too
              }
              :
              :

检查this sample，只需在onReceive()的末尾添加if(TOTAL_SCANS<20)

【讨论】：

我只想扫描20次，得到Wifi信号的平均RSSI值。除了在 onClick 处移动 wifi.startScan() 之外，我还应该做哪些其他修改
你能告诉我如何在主活动中初始化一个数组吗？在那之后我想我可以弄清楚。
这种方式不正确，因为每次扫描结束并调用 onReceive() 时，您都会循环运行 20 次，所以这可能会发生 20 * 20 次，检查后我会编辑我的答案

【解决方案2】：

更新：您可以查看我的使用 Android 设备进行射频测量的演示，您可以在此处找到几种方法：

https://github.com/panosvas/Measurements

您可以在其中找到一个接一个的 WiFi 测量实施方案。我还创建了一个用于存储这些测量值的服务器以及一个使用 UDP 数据包的远程触发应用程序，您可以在此处找到：

https://github.com/panosvas/IndoorPositioningServer

可以获得多个测量值。您的方法是错误的，因为 for 循环可能会以毫秒为单位执行，并且 Android 中的每个 wifi 测量根据设备保持大约 5 秒。实现目标的一种方法如下：

创建异步任务或调用 startScan() 的任务
保留一个计数器并在每次触发 onRecieve 时更新它
如果计数器未达到限制，则在 onRecieve 内再次调用该任务
如果计数器达到限制，则在 onRecieve 内您不必再次调用该任务

请记住，为了获得正确的测量结果，您必须等到每次测量完成，否则您将重复进行相同的测量。

【讨论】：