我已经制作了一个Android应用程序，其中一部分扫描wifi网络，并定期显示信号强度等信息与Toast。问题是，至少在棒棒糖上，它似乎在1-2次扫描后停止这样做，并且显示器上没有更多的祝酒词。这是我的代码：
public void startNavigation() {
findViewById(R.id.startNavigation).setVisibility(View.GONE);
Thread thread = new Thread() {
public void run() {
int i = 0;
WiFiScanner.WiFiScanner(activity);
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(globalcontext);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putInt("signalCounter", 0);
editor.commit();
while(running) {
if(i%2 == 0) {
activity.runOnUiThread(new Runnable() {
public void run() {
findViewById(R.id.pointer).setVisibility(View.GONE);
}
});
} else {
activity.runOnUiThread(new Runnable() {
public void run() {
int signalCounter = WiFiScanner.getCounter();
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(globalcontext);
int oldCounter = sharedPreferences.getInt("signalCounter", 0);
if(signalCounter > oldCounter) {
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putInt("signalCounter", signalCounter);
editor.commit();
ArrayList<WiFiData> oldScan = WiFiScanner.getOldWifiList();
ArrayList<WiFiData> newScan = WiFiScanner.getWifiList();
ArrayList<WiFiData> intersection = new ArrayList<WiFiData>();
for(int m=0;m<oldScan.size();m++) {
if(oldScan.get(m).getRSS() < -64) {
continue;
}
for(int n=0;n<newScan.size();n++) {
if(oldScan.get(m).getBSSID().equals(newScan.get(n).getBSSID())) {
intersection.add(oldScan.get(m));
intersection.add(newScan.get(n));
}
}
}
int totalValues = 0;
double summarizedDistance = 0;
int p = 0;
while(p < intersection.size()) {
summarizedDistance += Position.getNewDistance(intersection.get(p + 1).getRSS(), intersection.get(p).getRSS(), intersection.get(p).getFrequency());
totalValues++;
p=p+2;
}
int meanMovedDistanceInPixel = 0;
float angle = 0;
if(totalValues > 0) {
double meanMovedDistance = summarizedDistance/totalValues;
angle = currentPosition - sharedPreferences.getFloat("startCompass", (float)0.0);
if(angle < 0) {
angle = 360+angle;
}
int scaleField = Integer.parseInt(sharedPreferences.getString("scaleFieldText", "0"));
if(scaleField == 0) {
return;
}
meanMovedDistanceInPixel = (sharedPreferences.getInt("seekBar", 0)*5)/scaleField * (int)meanMovedDistance;
int posX = sharedPreferences.getInt("posX", 0);
int posY = sharedPreferences.getInt("posY", 0);
if(meanMovedDistanceInPixel != 0) {
int[] newCoordinates = new int[2];
newCoordinates = Position.getNewPosition(posX, posY, angle, meanMovedDistanceInPixel);
int newX = newCoordinates[0];
int newY = newCoordinates[1];
editor.putInt("posX", newX);
editor.putInt("posY", newY);
editor.commit();
setPosition(newX, newY);
} else {
setPosition(posX, posY);
}
}
String values = "";
values += "startangle " + String.valueOf(Math.abs(sharedPreferences.getFloat("startCompass", (float)0.0))) + "\n";
values += "currentposition " + String.valueOf(currentPosition) + "\n";
values += "angle " + String.valueOf(angle) + "\n";
values += "scalefield " + sharedPreferences.getString("scaleFieldText", "0") + "\n";
values += String.valueOf(meanMovedDistanceInPixel) + "\n";
for(int j=0;j<oldScan.size();j++) {
values += oldScan.get(j).getBSSID()+ ", " + oldScan.get(j).getRSS()+"\n";
}
values += "-----------\n";
for(int j=0;j<newScan.size();j++) {
values += newScan.get(j).getBSSID()+ ", " + newScan.get(j).getRSS()+"\n";
}
Toast.makeText(getApplicationContext(), String.valueOf(values), Toast.LENGTH_SHORT).show();
}
findViewById(R.id.pointer).setVisibility(View.VISIBLE);
}
});
}
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
i++;
}
}
};
thread.start();
}
这是wifi扫描程序的代码：
public class WiFiScanner {
static BroadcastReceiver wifiScanReceiver;
static Context globalcontext = null;
private static ArrayList<WiFiData> wifiList = new ArrayList<WiFiData>();
private static ArrayList<WiFiData> oldWifiList = new ArrayList<WiFiData>();
private static int counter = 0;
public static void WiFiScanner(Context context) {
globalcontext = context;
final WifiManager wifimanager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
wifiList = new ArrayList<WiFiData>();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
if (!wifimanager.isWifiEnabled()) {
wifimanager.setWifiEnabled(true);
try {
Thread.sleep(2000);
}catch (InterruptedException exception) {
Thread.currentThread().interrupt();
}
}
wifiScanReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
List<ScanResult> scanresult = wifimanager.getScanResults();
oldWifiList = wifiList;
wifiList = new ArrayList<WiFiData>();
for (int i = 0; i < scanresult.size(); i++) {
WiFiData wifidata = new WiFiData(scanresult.get(i).level, scanresult.get(i).SSID, scanresult.get(i).frequency, scanresult.get(i).BSSID);
wifiList.add(wifidata);
}
counter++;
wifimanager.startScan();
}
};
globalcontext.registerReceiver(wifiScanReceiver, intentFilter);
wifimanager.startScan();
}
public static int getCounter() {
return counter;
}
public static ArrayList<WiFiData> getWifiList() {
return wifiList;
}
public static ArrayList<WiFiData> getOldWifiList() {
return oldWifiList;
}
}
你能帮我找一下造成这个问题的原因吗？奇怪的是，我记得它在另一台计算机上编译应用程序后在KitKat上正常工作。安卓工作室有什么问题吗？
答案 0 :(得分：-1)
您是否将该应用作为服务运行？当手机屏幕关闭时，应用程序是否会暂停/停止？你尝试过使用Timer Task吗？或调度程序而不是thread.sleep？