Android, 主动 wifi 扫描

Question

我已经看到很多关于这个问题的话题，但它们都是几年前的，所以让我们再试一次吧！

对于我的论文，我正在尝试根据从 AP 获得的 RSSI 对室内定位进行编程。我正在使用一加二，在扫描 RSSI 值时，使用 WifiManager.startScan() 结合侦听器在准备好时获取结果，如果发现扫描非常非常慢且不适合实时支持。

有没有办法加快这个过程？主动扫描？只扫描某个频段/频率？我找不到问题的解决方案，所以我请求您的帮助！

Answer 1

wifi扫描示例：

package com.android.wifitester;

import java.util.List;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.<span class="hilite">wifi</span>.WifiManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class WifiTester extends Activity {
TextView mainText;
WifiManager mainWifi;
WifiReceiver receiverWifi;
List<ScanResult> wifiList;
StringBuilder sb = new StringBuilder();

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mainText = (TextView) findViewById(R.id.mainText);
mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
receiverWifi = new WifiReceiver();
registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
mainWifi.startScan();
mainText.setText("\\nStarting Scan...\\n");
}

public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 0, 0, "Refresh");
return super.onCreateOptionsMenu(menu);
}

public boolean onMenuItemSelected(int featureId, MenuItem item) {
mainWifi.startScan();
mainText.setText("Starting Scan");
return super.onMenuItemSelected(featureId, item);
}

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

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

class WifiReceiver extends BroadcastReceiver {
public void onReceive(Context c, Intent intent) {
sb = new StringBuilder();
wifiList = mainWifi.getScanResults();
for(int i = 0; i < wifiList.size(); i++){
sb.append(new Integer(i+1).toString() + ".");
sb.append((wifiList.get(i)).toString());
sb.append("\\n");
}
mainText.setText(sb);
}
}
}