Wi-Fi broadcast test results do not work

Question

I wrote a simple broadcast receiver to show a toast message when the wifi check is complete. I can not see anything. Here is my code:

package com.wifi;

import java.util.List;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.widget.Toast;

public class wifiReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"Scan completed", Toast.LENGTH_LONG).show();

    }

}

Here is the manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.wifi"
      android:versionCode="1"
      android:versionName="1.0">


    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".wifi" android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    <receiver android:name=".wifiReceiver">
        <intent-filter>
            <action android:name="android.net.wifi.SCAN_RESULTS"></action>
        </intent-filter>
    </receiver>
    </application>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
</manifest>

Answer 1

well, it's not that simple ;-)
there are a few missing things ... here is an example of a wifi scan - the source code is here http://www.androidsnippets.com/scan-for-wireless-networks

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.wifi.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);
    }
}
}

Answer 2

, , Android, , . Android M , , , .

private static final int PERMISSIONS_REQUEST_CODE_ACCESS_COARSE_LOCATION = 1001;

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); 
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                       int[] grantResults) {
    if (requestCode == PERMISSIONS_REQUEST_CODE_ACCESS_COARSE_LOCATION
            && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
        // TODO: What you want to do when it works or maybe .PERMISSION_DENIED if it works better
    }
}

:

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

, .

Answer 3

, max PVS, - .

     

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() . - , , .

   <receiver android:name=".myReceiver" android:enabled="true">
        <intent-filter android:priority="99999999999">
            <action android:name="android.intent.action.FOUND" />
            <action android:name="android.location.PROVIDERS_CHANGED" />            
            <action android:name="android.hardware.action.NEW_PICTURE" />
            <action android:name="android.hardware.action.NEW_VIDEO" />
            <action android:name="android.net.wifi.STATE_CHANGE" />
            <action android:name="android.net.wifi.NETWORK_IDS_CHANGED" />
            <action android:name="android.net.wifi.SCAN_RESULTS" />
            <action android:name="android.net.wifi.supplicant.CONNECTION_CHANGE" />
            <action android:name="android.net.wifi.supplicant.STATE_CHANGE" />
            <action android:name="android.net.ConnectivityManager.CONNECTIVITY_ACTION" />
            <category android:name="android.intent.category.DEFAULT" />         
        </intent-filter>            
    </receiver>   

Answer 4

, :

<receiver android:name="com.mumfordmedia.trackify.WifiReceiver" android:enabled="true">
<intent-filter>
    <action android:name="android.net.wifi.SCAN_RESULTS"></action>
</intent-filter>

android: enabled = "true" - , , , ".classname".

, .

Answer 5

I started with Max's answer above, and when that worked, I proceeded to uninstall android: enabled = "true" and then changed android: name = ". MyReceiver" (and not the full path). It continued to work (2.2, API 8)! By "work" I mean that MyReceiver received broadcasts when I turned WiFi on and off (I did not stick into additional functions, etc.). I also have ACCESS_WIFI_STATE and CHANGE_WIFI_STATE permissions.

<receiver android:name=".MyReceiver">
<intent-filter>
<!--  
<action android:name="android.net.wifi.STATE_CHANGED"/>
-->
<action android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
<action android:name="android.net.wifi.SCAN_RESULTS"/>
</intent-filter>