android 平板右下角WIFI无信号问题

来源：互联网发布：o2o平台软件下载编辑：程序博客网时间：2024/04/29 17:02

问题描述：

android平板状态栏整合到了屏幕右下角，我们在使用某些WIFI模块的时候会发现， WIFI热点扫描后，可以看到热点有信号显示，但是，在连接上热点后，右下角却始终没有信号格显示。

原因分析：

在WIFI连接后，状态栏一直接收不到信号值变化的广播，导致无法获取到WIFI信号值。至于为何收不到，应该就跟模块和驱动有关了。

frameworks/base/packages/apps/SystemUI/src/com/android/systemui/statusbar/policy/NetworkController.java

else if (action.equals(WifiManager.RSSI_CHANGED_ACTION)) {            mWifiRssi = intent.getIntExtra(WifiManager.EXTRA_NEW_RSSI, -200);            mWifiLevel = WifiManager.calculateSignalLevel(                    mWifiRssi, WifiIcons.WIFI_LEVEL_COUNT);        }

解决办法：

既然在扫描热点中有信号，那么可以通过获取此信号来显示。

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.anson.wifirssi"    android:versionCode="1"    android:versionName="1.0" >    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="17" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        >        <!-- activity            android:name="com.anson.wifirssi.MainActivity"            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="com.anson.wifirssi.BootReceiver">            <intent-filter android:priority="100">                <action android:name="android.intent.action.BOOT_COMPLETED"/>            </intent-filter>            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </receiver>        <service android:name="com.anson.wifirssi.RSSIService"></service>    </application></manifest>

package com.anson.wifirssi;import java.util.List;import android.app.Service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;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.Handler;import android.os.IBinder;import android.view.Menu;import android.widget.TextView;import android.widget.Toast;public class RSSIService extends Service {WifiManager wifiMgr = null;BroadcastReceiver receiver;String connectedSSID ="";int time = 0;boolean mWifiConnected;Handler h = new Handler(){public void handleMessage(android.os.Message msg) {showWifiState();h.sendEmptyMessageDelayed(0, 2000);if(time == 5){wifiMgr.startScan();time = 0;}time ++;};};@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();android.util.Log.d("RSSIService", "ALog 0925 > onCreate()-----------------------------------------");wifiMgr = (WifiManager)getSystemService(WIFI_SERVICE);h.sendEmptyMessageDelayed(0, 2000);IntentFilter filter = new IntentFilter();filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);receiver = new BroadcastReceiver(){@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubalog(intent.getAction());if(WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())){final NetworkInfo networkInfo = (NetworkInfo)                    intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);            mWifiConnected = networkInfo != null && networkInfo.isConnected();            if(mWifiConnected){            WifiInfo info = (WifiInfo) intent.getParcelableExtra(WifiManager.EXTRA_WIFI_INFO);            connectedSSID = info.getSSID();            }}}};registerReceiver(receiver, filter);}@Overridepublic void onStart(Intent intent, int startId) {// TODO Auto-generated method stubsuper.onStart(intent, startId);}@Overridepublic IBinder onBind(Intent arg0) {// TODO Auto-generated method stubreturn null;}void showWifiState(){List<ScanResult> results = wifiMgr.getScanResults();if(results != null && results.size() > 0){for(ScanResult sr:results){if(mWifiConnected && sr.SSID.equals(connectedSSID)){Intent intent = new Intent(WifiManager.RSSI_CHANGED_ACTION);intent.putExtra(WifiManager.EXTRA_NEW_RSSI, sr.level);sendBroadcast(intent);}}}}void alog(String s){android.util.Log.d("RSSIService", "ALog 0925 > " + s + "-----------------------------------------");}public String getWifiState(int state){String result = "WIFI_STATE_UNKNOWN";switch(state){case WifiManager.WIFI_STATE_DISABLED:result = "WIFI_STATE_DISABLE";break;case WifiManager.WIFI_STATE_DISABLING:result = "WIFI_STATE_DISABLING";break;case WifiManager.WIFI_STATE_ENABLED:result = "WIFI_STATE_ENABLED";break;case WifiManager.WIFI_STATE_ENABLING:result = "WIFI_STATE_ENABLING";break;}return result;}}

主要处理思路：

获取到热点信号后，通过广播发给状态栏。

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