这是我创建的接收器。问题在于它没有给我任何新的价值。我觉得它没有收到任何东西。我怎样才能让自己收到一些东西，为什么它不在这里工作？我用相同的方式对电池电量做了它并且它起作用了。最后，当我弄清楚如何收到某些东西时，我怎么才能得到WIFI吧（我想如果我让这个东西返回一些东西那么WIFI吧会更有意义）。
final BroadcastReceiver mWifiReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final WifiManager wifi = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
int state = wifi.getWifiState();
if(state == WifiManager.WIFI_STATE_ENABLED) {
List<ScanResult> results = wifi.getScanResults();
for (ScanResult result : results) {
if(result.BSSID.equals(wifi.getConnectionInfo().getBSSID())) {
int level = WifiManager.calculateSignalLevel(wifi.getConnectionInfo().getRssi(),
result.level);
int difference = level * 100 / result.level;
if(difference >= 100)
signalStrength = 4;
else if(difference >= 75)
signalStrength = 3;
else if(difference >= 50)
signalStrength = 2;
else if(difference >= 25)
signalStrength = 1;
}
}
}
}
};
boolean mRegisteredWifiReceiver = false;
当然，我处理了这里没有看到的用于注册，取消注册和调用的函数。
我是这样做的：
public void onVisibilityChanged(boolean visible) {
super.onVisibilityChanged(visible);
if (visible) {
registerReceiver();
registerWifiReceiver();
// registerBatteryReceiver();
// Update time zone in case it changed while we weren't visible.
mTime.clear(TimeZone.getDefault().getID());
mTime.setToNow();
invalidate();
} else {
unregisterReceiver();
unRegisterWifiReceiver();
//unRegisterBatteryReceiver();
}
}
private void registerWifiReceiver() {
if (mRegisteredWifiReceiver)
return;
mRegisteredWifiReceiver = true;
IntentFilter filter = new IntentFilter(WifiManager.RSSI_CHANGED_ACTION);
WatchFaceService.this.registerReceiver(mWifiReceiver, filter);
}
private void unRegisterWifiReceiver() {
if (!mRegisteredWifiReceiver)
return;
mRegisteredWifiReceiver = false;
WatchFaceService.this.unregisterReceiver(mWifiReceiver);
}