我解决了“检查位置是否已启用”的问题，但现在我卡住了。如果位置被禁用，我希望应用程序显示祝酒，并且一旦用户启用它，我希望应用程序正常进行，就像首先启用位置一样。我的代码对我来说是正确的，我不知道问题出在哪里。请注意，访问位置，网络和内容时没有任何问题。这只是我在启用位置后总是需要重新启动应用程序，否则它将不会继续并继续向我发出警告吐司。提前谢谢。
编辑：所以我刚添加了一个警告对话框方法而不是Toast消息。用户现在可以使用该对话框进入设置并打开位置和网络。我想请你看一下getForecast（）方法中的网络检查if-else语句。 else包含警告对话框，引导用户进行设置 - 数据漫游。当用户激活移动数据并返回应用程序时，一切都很好，应用程序可以获取信息。我为位置if-else语句做了同样的事情，但是当用户打开位置并返回应用程序时，无论我做什么（等待几分钟，刷新几次），我都没有获得位置信息。我需要每次关闭并重新打开应用程序。这就是我面临的确切问题。
代码：
public class MainActivity extends AppCompatActivity {
public static final String TAG = MainActivity.class.getSimpleName();
public static final String DAILY_FORECAST = "DAILY_FORECAST";
private Forecast mForecast;
@Bind(R.id.timeLabel) TextView mTimeLabel;
@Bind(R.id.tempLabel) TextView mTempLabel;
@Bind(R.id.humidityValue) TextView mHumidityValue;
@Bind(R.id.precipValue) TextView mPrecipValue;
@Bind(R.id.summaryLabel) TextView mSummaryLabel;
@Bind(R.id.windSpeedValue) TextView mWindSpeedValue;
@Bind(R.id.relativeLayout) RelativeLayout mRelativeLayout;
@Bind(R.id.container) SwipeRefreshLayout mSwipeRefreshLayout;
@Bind(R.id.locationLabel) TextView mLocationLabel;
double latitude;
double longitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
final GPSTracker gpsTracker = new GPSTracker(this);
mSwipeRefreshLayout.setColorSchemeColors(Color.RED, Color.GREEN, Color.BLUE, Color.CYAN);
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
mSwipeRefreshLayout.setRefreshing(false);
}
}, 1500);
if (gpsTracker.getIsGPSTrackingEnabled()){
getForecast(gpsTracker);
updateDisplay(gpsTracker);
} else {
Toast.makeText(MainActivity.this, "Please enable location services.!!", Toast.LENGTH_LONG).show();
gpsTracker.showSettingsAlert();
}
}
});
getForecast(gpsTracker);
}
private void getForecast(final GPSTracker gpsTracker) {
latitude = gpsTracker.getLatitude();
longitude = gpsTracker.getLongitude();
String apiKey = "7d22cdb138cd70f2e9e8d2006cd0461c";
String forecastUrl = "https://api.forecast.io/forecast/" + apiKey
+ "/" + latitude + "," + longitude;
if (isNetworkAvailable()) {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url(forecastUrl).build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Request request, IOException e) {
alertUserAboutError();
}
@Override
public void onResponse(Response response) throws IOException {
try {
String jsonData = response.body().string();
Log.v(TAG, jsonData);
if (response.isSuccessful()) {
mForecast = parseForecastDetails(jsonData);
runOnUiThread(new Runnable() {
@Override
public void run() {
if (gpsTracker.getIsGPSTrackingEnabled()) {
updateDisplay(gpsTracker);
} else {
Toast.makeText(MainActivity.this, "Please enable location services.", Toast.LENGTH_LONG).show();
}
}
});
} else {
alertUserAboutError();
}
} catch (IOException | JSONException e) {
Log.e(TAG, "Exception caught: ", e);
}
}
});
} else {
gpsTracker.showSettingsAlert2();
}
}
private void updateDisplay(GPSTracker gpsTracker) {
Currently currently = mForecast.getCurrently();
String area = gpsTracker.getSubLocality(this);
String city = gpsTracker.getAdminArea(this);
String country = gpsTracker.getCountryName(this);
mLocationLabel.setText(area + "\n" + city + ", " + country);
mTempLabel.setText(currently.getTemperature() + "");
mTimeLabel.setText(currently.getFormattedTime());
mHumidityValue.setText(currently.getHumidity() + "%");
mPrecipValue.setText(currently.getPrecipChance() + "%");
mSummaryLabel.setText(currently.getSummary());
mWindSpeedValue.setText(currently.getWindSpeed() + "");
Drawable drawable = getResources().getDrawable(currently.getBackgroundId());
mRelativeLayout.setBackground(drawable);
}
// irrelevant after this point. (I guess)
private Forecast parseForecastDetails(String jsonData) throws JSONException {
Forecast forecast = new Forecast();
forecast.setCurrently(getCurrentlyDetails(jsonData));
forecast.setHourlyForecast(getHourlyForecast(jsonData));
forecast.setDailyForecast(getDailyForecast(jsonData));
return forecast;
}
private Daily[] getDailyForecast(String jsonData) throws JSONException {
JSONObject forecast = new JSONObject(jsonData);
String timezone = forecast.getString("timezone");
JSONObject jsonDaily = forecast.getJSONObject("daily");
JSONArray data = jsonDaily.getJSONArray("data");
Daily[] days = new Daily[data.length()];
for (int i = 0; i < data.length(); i++) {
JSONObject daily = data.getJSONObject(i);
Daily day = new Daily();
day.setSummary(daily.getString("summary"));
day.setTempMax(daily.getDouble("temperatureMax"));
day.setTempMin(daily.getDouble("temperatureMin"));
day.setIcon(daily.getString("icon"));
day.setTime(daily.getLong("time"));
day.setTimezone(timezone);
days[i] = day;
}
return days;
}
private Hourly[] getHourlyForecast(String jsonData) throws JSONException{
JSONObject forecast = new JSONObject(jsonData);
String timezone = forecast.getString("timezone");
JSONObject jsonHourly = forecast.getJSONObject("hourly");
JSONArray data = jsonHourly.getJSONArray("data");
Hourly[] hours = new Hourly[data.length()];
for(int i=0; i < data.length(); i++) {
JSONObject hourly = data.getJSONObject(i);
Hourly hour = new Hourly();
hour.setSummary(hourly.getString("summary"));
hour.setTemp(hourly.getDouble("temperature"));
hour.setIcon(hourly.getString("icon"));
hour.setTime(hourly.getLong("time"));
hour.setTimezone(timezone);
hours[i] = hour;
}
return hours;
}
private Currently getCurrentlyDetails(String jsonData) throws JSONException {
JSONObject forecast = new JSONObject(jsonData);
String timezone = forecast.getString("timezone");
JSONObject currently = forecast.getJSONObject("currently");
Currently currentWeather = new Currently();
currentWeather.setHumidity(currently.getDouble("humidity"));
currentWeather.setTime(currently.getLong("time"));
currentWeather.setPrecipChance(currently.getDouble("precipProbability"));
currentWeather.setSummary(currently.getString("summary"));
currentWeather.setTemperature(currently.getDouble("temperature"));
currentWeather.setWindSpeed(currently.getDouble("windSpeed"));
currentWeather.setTimeZone(timezone);
currentWeather.setBackgroundId(currently.getString("icon"));
Log.d(TAG, currentWeather.getFormattedTime());
return currentWeather;
}
private boolean isNetworkAvailable() {
ConnectivityManager manager = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
boolean isAvailable = false;
if (networkInfo != null && networkInfo.isConnected()){
isAvailable = true;
}
return isAvailable;
}
private void alertUserAboutError() {
AlertDialogFragment dialog = new AlertDialogFragment();
dialog.show(getFragmentManager(), "error_dialog");
}
@OnClick (R.id.dailyButton)
public void startDailyActivity(View view){
Intent intent = new Intent(this, DailyForecastActivity.class);
intent.putExtra(DAILY_FORECAST, mForecast.getDailyForecast());
startActivity(intent);
}
}