我为我的Android设备制作了速度计。我使用三星Galaxy平板电脑测试我的应用程序，一切都很完美。我完成后，我想在我的手机上尝试它，但无法让它工作。它只显示＆＃34;搜索gps＆＃34; ..我问我的朋友他是否可以在他的手机上试用但仍然是同样的问题。有没有人有类似的问题？我改变了API级别，但没有区别。这两款手机都运行最新的Android版本，但我的平板电脑正在运行5.1.1。
MainActivity
public class MainActivity extends AppCompatActivity {
LocationService myService;
static boolean status;
LocationManager locationManager;
static TextView dist, time, speed, timetext, disttext;
static long startTime, endTime;
ImageView image;
static ProgressDialog locate;
static int p = 0;
public SharedPreferences preferences;
public SharedPreferences preferences2;
private ServiceConnection sc = new ServiceConnection() {
public void onServiceConnected(ComponentName name, IBinder service) {
LocationService.LocalBinder binder = (LocationService.LocalBinder) service;
myService = binder.getService();
status = true;
}
public void onServiceDisconnected(ComponentName name) {
status = false;
}
};
public ImageButton androidImmageButton;
public void init() {
androidImmageButton = findViewById(R.id.button);
androidImmageButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent toy = new Intent(MainActivity.this, Einstellungen.class);
startActivity(toy);
}
});
}
void bindService() {
if (status == true)
return;
Intent i = new Intent(getApplicationContext(), LocationService.class);
bindService(i, sc, BIND_AUTO_CREATE);
status = true;
startTime = System.currentTimeMillis();
}
void unbindService() {
if (status == false)
return;
Intent i = new Intent(getApplicationContext(), LocationService.class);
unbindService(sc);
status = false;
}
protected void onResume() {
super.onResume();
}
protected void onStart() {
super.onStart();
}
protected void onDestroy() {
super.onDestroy();
if (status == true)
unbindService();
}
public void onBackPressed() {
if (status == false)
super.onBackPressed();
else
moveTaskToBack(true);
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dist = findViewById(R.id.distancetext);
time = findViewById(R.id.timetext);
speed = findViewById(R.id.speedtext);
disttext = findViewById(R.id.textView3);
timetext = findViewById(R.id.textView4);
image = findViewById(R.id.image);
preferences2 = getSharedPreferences(Einstellungen.SHARED_PREFERENCES2, MODE_PRIVATE);
int size = preferences2.getInt(Einstellungen.SELECTED_COLOR2, 0);
speed.setTextSize(size);
preferences = getSharedPreferences(Einstellungen.SHARED_PREFERENCES, MODE_PRIVATE);
int color = preferences.getInt(Einstellungen.SELECTED_COLOR, Color.WHITE);
speed.setTextColor(color);
time.setTextColor(color);
dist.setTextColor(color);
timetext.setTextColor(color);
disttext.setTextColor(color);
start();
init();
}
public void start() {
checkGps();
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
return;
}
if (status == false)
bindService();
locate = new ProgressDialog(MainActivity.this);
locate.setIndeterminate(true);
locate.setCancelable(false);
locate.setMessage("searching gps");
locate.show();
}
void checkGps() {
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
showGPSDisabledAlertToUser();
}
}
private void showGPSDisabledAlertToUser() {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("please activate your gps")
.setCancelable(false)
.setPositiveButton("activate gps",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent callGPSSettingIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGPSSettingIntent);
}
});
alertDialogBuilder.setNegativeButton("cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
}
LocationServices
public class LocationService extends Service implements
LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
private static final long INTERVAL = 1000 * 2;
private static final long FASTEST_INTERVAL = 1000 * 1;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mCurrentLocation, lStart, lEnd;
static double distance = 0;
double speed;
private final IBinder mBinder = new LocalBinder();
public IBinder onBind(Intent intent) {
createLocationRequest();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
mGoogleApiClient.connect();
return mBinder;
}
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
public int onStartCommand(Intent intent, int flags, int startId) {
return super.onStartCommand(intent, flags, startId);
}
public void onConnected(Bundle bundle) {
try {
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
} catch (SecurityException e) {
}
}
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(
mGoogleApiClient, this);
distance = 0;
}
public void onConnectionSuspended(int i) {
}
public void onLocationChanged(Location location) {
MainActivity.locate.dismiss();
mCurrentLocation = location;
if (lStart == null) {
lStart = mCurrentLocation;
lEnd = mCurrentLocation;
} else
lEnd = mCurrentLocation;
updateUI();
speed = location.getSpeed() * 18 / 5;
}
public void onConnectionFailed(ConnectionResult connectionResult) {
}
public class LocalBinder extends Binder {
public LocationService getService() {
return LocationService.this;
}
}
private void updateUI() {
if (MainActivity.p == 0) {
distance = distance + (lStart.distanceTo(lEnd) / 1000.00);
MainActivity.endTime = System.currentTimeMillis();
long diff = MainActivity.endTime - MainActivity.startTime;
diff = TimeUnit.MILLISECONDS.toMinutes(diff);
MainActivity.time.setText(" " + diff + " min");
if (speed > 0.0)
MainActivity.speed.setText(" " + new DecimalFormat("#").format(speed) + " ");
else
MainActivity.speed.setText("0");
MainActivity.dist.setText(" " + new DecimalFormat("#.##").format(distance) + " km");
lStart = lEnd;
}
}
public boolean onUnbind(Intent intent) {
stopLocationUpdates();
if (mGoogleApiClient.isConnected())
mGoogleApiClient.disconnect();
lStart = null;
lEnd = null;
distance = 0;
return super.onUnbind(intent);
}
}
设置
public class Einstellungen extends AppCompatActivity {
String[] names2 = {"Small", "Normal", "Big"};
String[] des2 = {"Small", "Normal", "Big"};
ArrayAdapter<String> adapter2;
Spinner spinner2;
TextView description2;
public static final String SHARED_PREFERENCES2 = "SHARED_PREDS2";
public static final String SELECTED_COLOR2 = "SELECTED_COLOR2";
public SharedPreferences preferences2;
public static final String SELECTED_COLOR_POSITION2 = "SELECTED_COLOR_POSITION2";
String[] names = {"White", "Blue", "Red", "Green", "Yellow", "Gray", "Cyan", "Magenta"};
String[] des = {"White", "Blue", "Red", "Green", "Yellow", "Gray", "Cyan", "Magenta"};
ArrayAdapter<String> adapter;
Spinner spinner;
TextView description;
public static final String SHARED_PREFERENCES = "SHARED_PREFS";
public static final String SELECTED_COLOR = "SELECTED_COLOR";
public SharedPreferences preferences;
public static final String SELECTED_COLOR_POSITION = "SELECTED_COLOR_POSITION";
public ImageButton androidImmageButton;
public ImageButton androidImmageButton2;
public ImageButton androidImmageButton3;
public Button button;
public void init() {
androidImmageButton = findViewById(R.id.button);
androidImmageButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent toy = new Intent(Einstellungen.this, MainActivity.class);
startActivity(toy);
}
});
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_einstellungen);
preferences2 = getSharedPreferences(SHARED_PREFERENCES2, MODE_PRIVATE);
spinner2 = findViewById(R.id.spinner2);
description2 = findViewById(R.id.text);
adapter2 = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, names2);
spinner2.setAdapter(adapter2);
int position2 = preferences2.getInt(SELECTED_COLOR_POSITION2, 0);
spinner2.setSelection(position2);
spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> adapterView, View view, int d, long l) {
preferences2.edit().putInt(SELECTED_COLOR_POSITION2, d).apply();
switch (d) {
case 0:
description2.setText(des2[d]);
preferences2.edit().putInt(SELECTED_COLOR2, 140).apply();
break;
case 1:
description2.setText(des2[d]);
preferences2.edit().putInt(SELECTED_COLOR2, 190).apply();
break;
case 2:
description2.setText(des[d]);
preferences2.edit().putInt(SELECTED_COLOR2, 240).apply();
break;
}
}
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
preferences = getSharedPreferences(SHARED_PREFERENCES, MODE_PRIVATE);
spinner = findViewById(R.id.spinner);
description = findViewById(R.id.text);
adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, names);
spinner.setAdapter(adapter);
int position = preferences.getInt(SELECTED_COLOR_POSITION, 0);
spinner.setSelection(position);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
preferences.edit().putInt(SELECTED_COLOR_POSITION, i).apply();
switch (i) {
case 0:
description.setText(des[i]);
preferences.edit().putInt(SELECTED_COLOR, Color.WHITE).apply();
break;
case 1:
description.setText(des[i]);
preferences.edit().putInt(SELECTED_COLOR, Color.BLUE).apply();
break;
case 2:
description.setText(des[i]);
preferences.edit().putInt(SELECTED_COLOR, Color.RED).apply();
break;
case 3:
description.setText(des[i]);
preferences.edit().putInt(SELECTED_COLOR, Color.GREEN).apply();
break;
case 4:
description.setText(des[i]);
preferences.edit().putInt(SELECTED_COLOR, Color.YELLOW).apply();
break;
case 5:
description.setText(des[i]);
preferences.edit().putInt(SELECTED_COLOR, Color.GRAY).apply();
break;
case 6:
description.setText(des[i]);
preferences.edit().putInt(SELECTED_COLOR, Color.CYAN).apply();
break;
case 7:
description.setText(des[i]);
preferences.edit().putInt(SELECTED_COLOR, Color.MAGENTA).apply();
break;
}
}
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
init();
}
}