我试图在我的源代码中找到返回数据的字符串或长值（所以我可以将它们发布到我的服务器）但是当我尝试使用以下方法对它们进行空值检查时：
Log.d(TAG, String.valueOf(WifiInfo.LINK_SPEED_UNITS));
数据永远不会出现在日志中。任何建议都非常感谢！
服务类来源：
public class Service_class extends Service {
public static String TAG="TEST TAG";
TextView textSsid, textSpeed, textRssi;
public Handler mHandler = new Handler();
public long mStartRX = 0;
public long mStartTX = 0;
public long txBytes;
public void onCreate(Bundle savedInstanceState) {
super.onCreate();
textSsid = (TextView) findViewById(R.id.Ssid);
textSpeed = (TextView) findViewById(R.id.Speed);
textRssi = (TextView) findViewById(R.id.Rssi);
Long.toString(mStartTX);
Long.toString(mStartRX);
Long.toString(txBytes);
mStartRX = TrafficStats.getTotalRxBytes();
mStartTX = TrafficStats.getTotalTxBytes();
if (mStartRX == TrafficStats.UNSUPPORTED || mStartTX == TrafficStats.UNSUPPORTED) {
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Uh Oh!");
alert.setMessage("Your device does not support traffic stat monitoring.");
alert.show();
} else {
mHandler.postDelayed(mRunnable, 1000);
}
}
private TextView findViewById(int speed) {
// TODO Auto-generated method stub
return null;
}
private final Runnable mRunnable = new Runnable() {
public void run() {
TextView RX = (TextView)findViewById(R.id.RX);
TextView TX = (TextView)findViewById(R.id.TX);
long rxBytes = TrafficStats.getTotalRxBytes()- mStartRX;
RX.setText(Long.toString(rxBytes));
long txBytes = TrafficStats.getTotalTxBytes()- mStartTX;
TX.setText(Long.toString(txBytes));
mHandler.postDelayed(mRunnable, 1000);
ParseObject testObject = new ParseObject("TestObject");
testObject.put("DataOut", Long.valueOf(txBytes));
testObject.put("DataIn", Long.valueOf(mStartRX));
testObject.put("DataRSSI", String.valueOf(textRssi));
testObject.put("DataSpeed", String.valueOf(textSpeed));
testObject.saveInBackground();
final Chronometer myChronometer = (Chronometer)findViewById(R.id.chronometer);
myChronometer.start();
DisplayWifiState();
this.registerReceiver(this.myWifiReceiver, new IntentFilter(
ConnectivityManager.CONNECTIVITY_ACTION));
}
private Chronometer findViewById(int chronometer) {
// TODO Auto-generated method stub
return null;
}
private void registerReceiver(BroadcastReceiver myWifiReceiver2,
IntentFilter intentFilter) {
// TODO Auto-generated method stub
}
private BroadcastReceiver myWifiReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
NetworkInfo networkInfo = (NetworkInfo) arg1
.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
DisplayWifiState();
}
}
};
public void DisplayWifiState() {
ConnectivityManager myConnManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo myNetworkInfo = myConnManager
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
WifiManager myWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo myWifiInfo = myWifiManager.getConnectionInfo();
if (myNetworkInfo.isConnected()) {
textSsid.setText(myWifiInfo.getSSID());
textSpeed.setText(String.valueOf(myWifiInfo.getLinkSpeed()) + " "
+ WifiInfo.LINK_SPEED_UNITS);
Log.d(TAG, String.valueOf(WifiInfo.LINK_SPEED_UNITS));
textRssi.setText(String.valueOf(myWifiInfo.getRssi()));
} else {
textSsid.setText("---");
textSpeed.setText("---");
textRssi.setText("---");
}}};
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "Hello World", Toast.LENGTH_LONG).show();
// Log.d(TAG, "starting service");
ParseObject testObject = new ParseObject("TestObject");
testObject.put("DataOut", Long.valueOf(txBytes));
testObject.put("DataIn", Long.valueOf(mStartRX));
testObject.put("DataRSSI", String.valueOf(textRssi));
testObject.put("DataSpeed", String.valueOf(textSpeed));
testObject.saveInBackground();
return START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Stopped", Toast.LENGTH_LONG).show();
}
@Override
public void onCreate() {
super.onCreate();
}
}
主程序.Java
public class Main extends Activity {
TextView textSsid, textSpeed, textRssi;
public Handler mHandler = new Handler();
public long mStartRX = 0;
public long mStartTX = 0;
public long txBytes;
public static String TAG="TEST TAG";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Start service using AlarmManager
Calendar cal = Calendar.getInstance();
cal.add(Calendar.SECOND, 10);
Intent intent = new Intent(Main.this, Service_class.class);
PendingIntent pintent = PendingIntent.getService(Main.this, 0, intent,
0);
AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
12 * 1000, pintent);
// click listener for the button to start service
Button btnStart = (Button) findViewById(R.id.button1);
btnStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startService(new Intent(getBaseContext(), Service_class.class));
}
});
// click listener for the button to stop service
Button btnStop = (Button) findViewById(R.id.button2);
btnStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
stopService(new Intent(getBaseContext(), Service_class.class));
}
});
textSsid = (TextView) findViewById(R.id.Ssid);
textSpeed = (TextView) findViewById(R.id.Speed);
textRssi = (TextView) findViewById(R.id.Rssi);
Long.toString(mStartTX);
Long.toString(mStartRX);
Long.toString(txBytes);
ParseAnalytics.trackAppOpened(getIntent());
mStartRX = TrafficStats.getTotalRxBytes();
mStartTX = TrafficStats.getTotalTxBytes();
if (mStartRX == TrafficStats.UNSUPPORTED || mStartTX == TrafficStats.UNSUPPORTED) {
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Uh Oh!");
alert.setMessage("Your device does not support traffic stat monitoring.");
alert.show();
} else {
mHandler.postDelayed(mRunnable, 1000);
}}
private final Runnable mRunnable = new Runnable() {
public void run() {
TextView RX = (TextView)findViewById(R.id.RX);
TextView TX = (TextView)findViewById(R.id.TX);
long rxBytes = TrafficStats.getTotalRxBytes()- mStartRX;
RX.setText(Long.toString(rxBytes));
long txBytes = TrafficStats.getTotalTxBytes()- mStartTX;
TX.setText(Long.toString(txBytes));
mHandler.postDelayed(mRunnable, 1000);
final Chronometer myChronometer = (Chronometer)findViewById(R.id.chronometer);
myChronometer.start();
DisplayWifiState();
this.registerReceiver(this.myWifiReceiver, new IntentFilter(
ConnectivityManager.CONNECTIVITY_ACTION));
}
private void registerReceiver(BroadcastReceiver myWifiReceiver2,
IntentFilter intentFilter) {
// TODO Auto-generated method stub
}
private BroadcastReceiver myWifiReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
NetworkInfo networkInfo = (NetworkInfo) arg1
.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
DisplayWifiState();
}
}
};
public void DisplayWifiState() {
ConnectivityManager myConnManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo myNetworkInfo = myConnManager
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
WifiManager myWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo myWifiInfo = myWifiManager.getConnectionInfo();
if (myNetworkInfo.isConnected()) {
textSsid.setText(myWifiInfo.getSSID());
textSpeed.setText(String.valueOf(myWifiInfo.getLinkSpeed()) + " "
+ WifiInfo.LINK_SPEED_UNITS);
textRssi.setText(String.valueOf(myWifiInfo.getRssi()));
} else {
textSsid.setText("---");
textSpeed.setText("---");
textRssi.setText("---");
}
};
};}