本文介绍了无线广播接收器的onReceive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
我与无线广播接收器的问题。它不接受任何东西，的onReceive不会被调用。这里是我的code：
I have problems with the wifi broadcast receiver. It doesn't receive anything, onReceive is never called. Here's my code:
public final class WifiChangeReceiver extends BroadcastReceiver {
boolean portableHotspot = true;
@Override
public void onReceive(final Context context, Intent intent) {
boolean alreadyPresent = false;
String action = intent.getAction();
if(action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
WifiManager w = (WifiManager) context
.getSystemService(Context.WIFI_SERVICE);
List<ScanResult> l = w.getScanResults();
myApp myApp = (myApp)context.getApplicationContext();
List<ScanResult> previousScan = new ArrayList<ScanResult>();
previousScan = myApp.getPreviousScan();
System.out.print("previousScan " + previousScan + "\n");
for (ScanResult r : l) {
if(r.SSID.equals("\""+"TinyBox"+"\"")) {
if(previousScan!=null) {
for (ScanResult previousScanElement : previousScan) {
if(previousScanElement.SSID.contains("\""+"TinyBox"+"\"")) {
alreadyPresent = true;
break;
}
}
}
if (!alreadyPresent) {
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
Methods.connectToNetwork(context);
}
}, 5000);
alreadyPresent = false;
}
}
}
myApp.setPreviousScan(l);
ConnectivityManager conMgr = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo i = conMgr.getActiveNetworkInfo();
//Se non connesso a nessuna rete, allora tiro su TinyBox.
if (i == null) {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
i = conMgr.getActiveNetworkInfo();
if (i == null) {
boolean portableHotspot = false;
final SQLiteDatabase db = DatabaseManager.getInstance(context).getWritableDatabase();
Cursor c = HotSpotActivation.getHotSpotState(db);
if (c.getCount() > 0) {
String activation = c.getString(c.getColumnIndex(HotSpotActivation.CHECK_STATE));
if (activation.equals("ON")) {
portableHotspot = true;
}
else {
portableHotspot = false;
}
}
if (portableHotspot) {
Methods.setWirelessHotSpot(context.getApplicationContext());
}
}
}
else {
}
}
else if(action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {
int iTemp = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,
WifiManager.WIFI_STATE_UNKNOWN);
checkState(iTemp);
}
else if(action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
DetailedState state=
((NetworkInfo)intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO)).getDetailedState();
changeState(state, context);
}
}
private void changeState(DetailedState aState, Context context) {
if (aState == DetailedState.SCANNING) {
Log.d("wifiSupplicanState", "SCANNING");
}
else if (aState == DetailedState.CONNECTING) {
Log.d("wifiSupplicanState", "CONNECTING");
}
else if(aState == DetailedState.OBTAINING_IPADDR) {
Log.d("wifiSupplicanState", "OBTAINING_IPADDR");
}
else if (aState == DetailedState.CONNECTED) {
Log.d("wifiSupplicanState", "CONNECTED");
}
else if (aState == DetailedState.DISCONNECTING) {
Log.d("wifiSupplicanState", "DISCONNECTING");
}
else if (aState == DetailedState.DISCONNECTED) {
myApp myApp = (myApp)context.getApplicationContext();
portableHotspot = myApp.getPortableHotspot();
if (portableHotspot) {
Methods.setWirelessHotSpot(context.getApplicationContext());
}
}
else if (aState == DetailedState.FAILED) {
}
}
public void checkState(int aInt) {
if (aInt == WifiManager.WIFI_STATE_ENABLING) {
Log.d("WifiManager", "WIFI_STATE_ENABLING");
}
else if (aInt== WifiManager.WIFI_STATE_ENABLED) {
Log.d("WifiManager", "WIFI_STATE_ENABLED");
}
else if (aInt == WifiManager.WIFI_STATE_DISABLING) {
Log.d("WifiManager", "WIFI_STATE_DISABLING");
}
else if (aInt == WifiManager.WIFI_STATE_DISABLED) {
Log.d("WifiManager", "WIFI_STATE_DISABLED");
}
}
}
和清单：
<uses-permission android:name="android.permission.INTERNET" />
<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_WIFI_MULTICAST_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_SUPERUSER"/>
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
<uses-permission android:name="android.permission.INTERACT_ACROSS_USERS_FULL" />
<receiver android:name="sample.broadcastreceivers.WifiChangeReceiver">
<intent-filter>
<action android:name="android.net.wifi.WIFI_STATE_CHANGED"></action>
<action android:name="android.net.wifi.supplicant.CONNECTION_CHANGE"></action>
<action android:name="android.net.wifi.STATE_CHANGE"></action>
<action android:name="android.net.wifi.SCAN_RESULTS"></action>
</intent-filter>
</receiver>
它的工作原理（上接叫）只有当我去到WiFi设置菜单，在这种网络中列出的，没有推什么，就打开它。立刻之后，我进入该菜单我开始从广播接收机接收和一切工作正常，没有任何理由。
It works (on Receive is called) only if I go to the wifi settings menu, the one in which networks are listed, without pushing anything, just opening it. Immediatly after I enter that menu I start to receive from the broadcast receiver and all works fine, without any reason.
问题出在哪里？这就像一个Android的bug。我确信同样的code前有时工作。谢谢
Where is the problem? It's like an Android bug. I'm quite sure the same code worked sometimes ago. Thanks
推荐答案
检查AndroidManifest：你声明
Check your AndroidManifest: you declare
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
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