Wifi 扫描结果广播接收器不工作

本文介绍了Wifi 扫描结果广播接收器不工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我编写了一个简单的广播接收器，用于在 wifi 扫描完成时显示 Toast 消息.什么都没有显示.这是我的代码:

I have written a simple broadcast receiver to show a toast message when wifi scan is completed. Nothing is showing. 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.wifi.ScanResult; import android.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(); } }

这是清单文件:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="schemas.android/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.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>

推荐答案

嗯，没那么容易 ;-)缺少一些东西......这是 wifi 扫描的示例 - 原始源代码位于此处 www.androidsnippets/scan-for-wireless-networks

well, it's not that easy ;-) there are couple of things missing... here is an example of a wifi scan - the original source code is located here www.androidsnippets/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.wifi.ScanResult; import android.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); } } }