我和这个人打了一个星期，没有运气。
从一开始：
包含导航抽屉的活动。这项活动有自己的片段。片段具有向天气api发送请求的逻辑和用给定数据更新自身的逻辑。在第一次运行似乎一切正常！我能够使用给定的数据发送请求和填充视图（使用okHttp）。
片段重新播放后，一切都开始崩溃，我不断将getActivity（）变为null;（
以下代码示例：
碎片首次初始化：
public abstract class DoubleFragmentActivity extends AppCompatActivity {
protected static final String TOP_FRAGMENT = "TOP_FRAGMENT";
protected static final String BOTTOM_FRAGMENT = "BOTTOM_FRAGMENT";
protected abstract Fragment topFragment();
protected abstract Fragment bottomFragment();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_container);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.topFragmentContainer, topFragment(), TOP_FRAGMENT)
.add(R.id.bottomFragmentContainer, bottomFragment(), BOTTOM_FRAGMENT)
.commit();
getSupportFragmentManager().executePendingTransactions();
}
}
}
导航抽屉：
private void selectDrawerItem(MenuItem menuItem) {
Fragment f;
Fragment f2;
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
switch (menuItem.getItemId()) {
case R.id.forecastFragment:
f = getSupportFragmentManager().findFragmentByTag("TOP_FRAGMENT");
f2 = getSupportFragmentManager().findFragmentByTag("BOTTOM_FRAGMENT");
if (f != mCurrentForecastFragment || f2 != mDailyForecastFragment) {
ft.replace(R.id.topFragmentContainer, new CurrentForecastFragment(), "TOP_FRAGMENT");
ft.replace(R.id.bottomFragmentContainer, new DailyForecastFragment(), "BOTTOM_FRAGMENT");
} else {
}
break;
case R.id.settingsFragment:
mToolbar.setVisibility(View.INVISIBLE);
f = new SettingsFragment();
ft.replace(R.id.topFragmentContainer, f);
break;
case R.id.paymentsFragment:
f = new PaymentsFragment();
ft.replace(R.id.topFragmentContainer, f);
break;
case R.id.aboutFragment:
break;
default:
}
getSupportFragmentManager().executePendingTransactions();
ft.commit();
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
mDrawer.closeDrawers();
}
用于连接和填充数据的片段逻辑：
public void makeConnectionToApi(String lat, String lon) {
mWeatherParams.setLanguage(Locale.getDefault().getLanguage());
Activity a = getActivity();
Uri.Builder currentBuilder = new Uri.Builder();
currentBuilder.scheme("http")
.authority("api.openweathermap.org")
.appendPath("data")
.appendPath("2.5")
.appendPath("weather")
.appendQueryParameter(WeatherConstants.KEY_LATITUDE, lat)
.appendQueryParameter(WeatherConstants.KEY_LONGITUDE, lon)
.appendQueryParameter(WeatherConstants.KEY_UNITS, mUnit)
.appendQueryParameter(WeatherConstants.KEY_LANGUAGE, mWeatherParams.getLanguage())
.appendQueryParameter("APPID", "###");
String currentUrl = currentBuilder.build().toString();
if (mUtility.isNetworkAvalaible()) {
Request requestCurrent = new Request.Builder().url(currentUrl).build();
//FIRST CALL
mCall = client.newCall(requestCurrent);
mCall.enqueue(new Callback() {
@Override
public void onFailure(Request request, IOException e) {
Bundle args = new Bundle();
args.putString(TAG, e.toString());
Utility.invokeDialog(TAG, e.toString(), getFragmentManager());
}
@Override
public void onResponse(Response response) throws IOException {
String responseBody = String.valueOf(response.body().string());
try {
mForecast.setCurrent(fetchCurrent(responseBody));
} catch (JSONException e) {
e.printStackTrace();
}
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
fillViewWithValues();
}
});
}
});
} else {
Utility.invokeDialog(TAG, "Check your internet connection!", getFragmentManager());
}
}
private Current fetchCurrent(String responseBody) throws JSONException {
Current current = new Current();
JSONObject jo = new JSONObject(responseBody);
//FETCH WEATHER ARRAY
JSONArray weather = jo.getJSONArray(WeatherConstants.KEY_CURRENT_CONDITIONS_ARRAY);
for (int j = 0; j < weather.length(); j++) {
JSONObject weatherParser = weather.getJSONObject(j);
current.setIcon(weatherParser.getString(WeatherConstants.KEY_ICON_ID));
Log.i(TAG, "Icons ID: " + weatherParser.getString(WeatherConstants.KEY_ICON_ID));
current.setConditions(weatherParser.getString(WeatherConstants.KEY_DESCRIPTION));
}
//FETCH TEMP
JSONObject temp = jo.getJSONObject(WeatherConstants.KEY_MAIN_OBJECT);
current.setDay(temp.getDouble(WeatherConstants.KEY_TEMP));
current.setPressure(temp.getDouble(WeatherConstants.KEY_PRESSURE));
current.setHumidity(temp.getDouble(WeatherConstants.KEY_HUMIDITY));
current.setDayMax(temp.getDouble(WeatherConstants.KEY_TEMP_DAY_MAX));
// FETCH VISIBILITY
if (jo.has(WeatherConstants.KEY_VISIBILITY)) {
current.setVisibility(jo.getInt(WeatherConstants.KEY_VISIBILITY));
}
//FETCH WIND
JSONObject wind = jo.getJSONObject(WeatherConstants.KEY_WIND_OBJECT);
current.setWindSpeed(wind.getDouble(WeatherConstants.KEY_WIND_SPEED));
if (wind.has(WeatherConstants.KEY_WIND_DEGREES)) {
current.setWindDegrees(wind.getInt(WeatherConstants.KEY_WIND_DEGREES));
}
JSONObject clouds = jo.getJSONObject(WeatherConstants.KEY_CLOUDS);
current.setClouds(clouds.getInt("all"));
current.setTimeStamp(jo.getInt(WeatherConstants.KEY_TIMESTAMP));
current.setCurrentLocation(jo.getString(WeatherConstants.KEY_CITY_NAME));
return current;
}
private void fillViewWithValues() {
Current current = mForecast.getCurrent();
if (mDeegreSwitch == 0) {
mCurrentTemperature.setText(current.getDay() + "\u00B0");
// setBackgroundColor(current.getDay());
} else {
int c = current.getDay();
double f = (9.0 / 5.0) * c + 32;
int e = (int) Math.round(f);
mCurrentTemperature.setText(String.valueOf((int) Math.round(f)) + "\u00B0");
// setBackgroundColor(e);
}
mCurrentCondition.setText(current.getConditions());
mPressure.setText(String.valueOf(current.getPressure()) + "hPa");
mClouds.setText(String.valueOf(current.getClouds()) + "%");
mHumidity.setText(String.valueOf(current.getHumidity()) + "%");
mCurrentIcon.setImageResource(current.getIcon());
}
此处出现问题：getConnectionToApi方法中的getActivity（）。runOnUiThread。我试图从onAttach方法获取一个活动，并将其作为参数传递给makeConnectionToApi，但它有效...但部分。应用程序没有崩溃，但片段的视图没有更新，就像下面有第二个片段或者什么。
我填写它可能是线程的东西，或者我对片段事务做错了......