Android 无线扫描的广播接收器不工作
我在使用AlarmManager调用的服务中有以下代码(这很有效),但当我启动wifi扫描(返回true)时,我从未在我创建的BroadcastReceiver中收到结果:Android 无线扫描的广播接收器不工作,android,service,android-broadcastreceiver,Android,Service,Android Broadcastreceiver,我在使用AlarmManager调用的服务中有以下代码(这很有效),但当我启动wifi扫描(返回true)时,我从未在我创建的BroadcastReceiver中收到结果: public class WifiCheckerService extends IntentService { WifiManager wifiManager; List<Wifi> savedWifis; List<Wifi> wifisInRange; List&
public class WifiCheckerService extends IntentService {
WifiManager wifiManager;
List<Wifi> savedWifis;
List<Wifi> wifisInRange;
List<ScanResult> wifisInRangeResults;
BroadcastReceiver broadcastReceiver;
public WifiCheckerService() {
super("WifiCheckerService");
}
@Override
public void onCreate() {
super.onCreate();
setScanAlwaysAvailable();
if(broadcastReceiver == null)
broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
check();
}
};
if (wifiManager == null)
wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
registerReceiver(broadcastReceiver,
new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
}
@Override
protected void onHandleIntent(Intent intent) {
if (intent != null) {
wifiManager.startScan();
}
}
private void check() {
// irrelevant stuff
Intent intent = new Intent(Constants.BROADCAST_UPDATE_WIFI);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
sendBroadcast(intent);
}
}
public List<Wifi> getSavedWifisInRange(List<Wifi> savedWifis,
List<ScanResult> wifisInRangeResults) {
List<Wifi> wifisInRange = new ArrayList<Wifi>();
for (Wifi wifi : savedWifis) {
for (int i = 0; i < wifisInRangeResults.size(); i++) {
if (wifi.getSsid().equals(wifisInRangeResults.get(i).SSID)) {
wifi.setRssi(String.valueOf(wifisInRangeResults.get(i).level));
wifisInRange.add(wifi);
}
}
}
return wifisInRange;
}
public void setScanAlwaysAvailable() {
/* Set scan always available if it is turned off*/
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR2) {
if (!wifiManager.isScanAlwaysAvailable()) {
startActivity(new Intent(WifiManager.ACTION_REQUEST_SCAN_ALWAYS_AVAILABLE));
}
}
}
public boolean isTetheringActive() {
//irrelevant stuff
return false;
}
private boolean isAnySavedWifiInRange() {
//irrelevant stuff
return true;
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(wifiScanReceiver);
}
}
公共类WifiCheckerService扩展了IntentService{
WifiManager WifiManager;
列出保存的文件;
列出wifisInRange;
列出wifisInRangeResults;
广播接收机广播接收机;
公共线路检查服务(){
超级(“WifiCheckerService”);
}
@凌驾
public void onCreate(){
super.onCreate();
设置CanalwaysAvailable();
if(broadcastReceiver==null)
broadcastReceiver=新的broadcastReceiver(){
@凌驾
公共void onReceive(上下文、意图){
检查();
}
};
if(wifiManager==null)
wifiManager=(wifiManager)getSystemService(Context.WIFI_服务);
寄存器接收器(广播接收器,
新的IntentFilter(WifiManager.SCAN\u RESULTS\u AVAILABLE\u ACTION));
}
@凌驾
受保护的手部内容无效(意图){
if(intent!=null){
wifiManager.startScan();
}
}
私人作废检查(){
//无关的东西
意向意向=新意向(常数.广播\更新\无线);
intent.addFlags(intent.FLAG\u活动\u新任务);
发送广播(意图);
}
}
公共列表GetSavedWifisRange(列表savedWifis,
列出wifisInRangeResults){
List wifisInRange=new ArrayList();
用于(Wifi:savedWifis){
对于(int i=0;iBuild.VERSION\u code.JELLY\u BEAN\u MR2){
如果(!wifiManager.isScanAlwaysAvailable()){
startActivity(新意图(WifiManager.ACTION\u REQUEST\u SCAN\u ALWAYS\u AVAILABLE));
}
}
}
public boolean isTetheringActive(){
//无关的东西
返回false;
}
私有布尔值isAnySavedWifiInRange(){
//无关的东西
返回true;
}
@凌驾
公共空间{
super.ondestory();
未注册接收器(wifiScanReceiver);
}
}
我以前使用过无线扫描的广播接收器,但我不知道为什么这不起作用
怎么了
编辑:AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
我对IntentService的理解是,它只在处理请求所需的时间(即,运行OnHandleContent()所需的时间)内处于活动状态。我还没有测试过你的代码,但我猜当onDestroy()运行时,在扫描结果发送之前,你的广播接收器马上就被注销了。可能IntentService不适合这样做。您可能需要创建一个“常规”(长期生活背景)服务。或者,让您的BroadcastReceiver参与到显示扫描结果的活动中,并完全摆脱此IntentService,可能会更有意义。WifiManager::startScan()是异步的,因此无论如何都不需要在后台服务上调用它。我对IntentService的理解是,它只在处理请求所需的时间(即,运行onHandleIntent()所需的时间)内处于活动状态。我还没有测试过你的代码,但我猜当onDestroy()运行时,在扫描结果发送之前,你的广播接收器马上就被注销了。可能IntentService不适合这样做。您可能需要创建一个“常规”(长期生活背景)服务。或者,让您的BroadcastReceiver参与到显示扫描结果的活动中,并完全摆脱此IntentService,可能会更有意义。WifiManager::startScan()是异步的,因此不必在后台服务上调用它。您在哪个接收器中检查wifi连接?在AlarmReceiver?@GrenderNo中,它是在WifiCheckerService的onCreate方法中,并进行了数字注册。此线程可能会有帮助我知道如何执行该线程所说的操作,问题是我的代码不起作用,我不知道原因:/you's handling onReceive()?您在哪个接收器中检查wifi连接?在AlarmReceiver?@GrenderNo中,它是在WifiCheckerService的onCreate方法中,并进行了数字注册。此线程可能会有帮助。我知道如何执行该线程所说的操作,问题是我的代码无法正常工作,我不知道原因:/you在哪里处理onReceive()?
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="com.android.vending.BILLING" />
<application
android:name=".WifiSentinelApp"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".activities.MainActivity"
android:label="@string/app_name"
android:screenOrientation="portrait"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".activities.DonateActivity"
android:label="@string/donate"
android:screenOrientation="portrait"
android:theme="@style/AppTheme.NoActionBar" />
<activity
android:name=".activities.SettingsActivity"
android:label="@string/settings"
android:screenOrientation="portrait" />
<receiver android:name=".receivers.AlarmReceiver" />
<receiver android:name=".receivers.BootReceiver"
android:enabled="false">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<service android:name=".services.WifiCheckerService" />
</application>