Android Open Source - Sunshine Forecast Fragment

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License

The source code is released under:

Apache License

Java Source Code

package com.example.mark.helloworld.app;
// w  ww .j av  a 2s  .c  o m
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.example.mark.helloworld.app.data.WeatherContract;
import com.example.mark.helloworld.app.data.WeatherContract.LocationEntry;
import com.example.mark.helloworld.app.data.WeatherContract.WeatherEntry;

import java.util.ArrayList;
import java.util.Date;

/**
 * A placeholder fragment containing a simple view.
 */
public class ForecastFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> {

    private static final int FORECAST_LOADER = 0;
    private String mLocation;

    // For the forecast view we're showing only a small subset of the stored data.
    // Specify the columns we need.
    private static final String[] FORECAST_COLUMNS = {
            // In this case the id needs to be fully qualified with a table name, since
            // the content provider joins the location & weather tables in the background
            // (both have an _id column)
            // On the one hand, that's annoying.  On the other, you can search the weather table
            // using the location set by the user, which is only in the Location table.
            // So the convenience is worth it.
            WeatherEntry.TABLE_NAME + "." + WeatherEntry._ID,
            WeatherEntry.COLUMN_DATETEXT,
            WeatherEntry.COLUMN_SHORT_DESC,
            WeatherEntry.COLUMN_MAX_TEMP,
            WeatherEntry.COLUMN_MIN_TEMP,
            LocationEntry.COLUMN_LOCATION_SETTING
    };

    // These indices are tied to FORECAST_COLUMNS.  If FORECAST_COLUMNS changes, these
    // must change.
    public static final int COL_WEATHER_ID = 0;
    public static final int COL_WEATHER_DATE = 1;
    public static final int COL_WEATHER_DESC = 2;
    public static final int COL_WEATHER_MAX_TEMP = 3;
    public static final int COL_WEATHER_MIN_TEMP = 4;
    public static final int COL_LOCATION_SETTING = 5;

    private final String LOG_TAG = ForecastFragment.class.getSimpleName();

    private ArrayAdapter<String> mForecastAdapter;

    public ForecastFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.forecastfragment, menu);
    }

    @Override
    public  boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.action_refresh) {
            updateWeather();
            return true;
        }
        if (id == R.id.action_map) {
           openPreferredLocationInMap();
        }
        return super.onOptionsItemSelected(item);
    }

    private void openPreferredLocationInMap() {
        final String LOCATION_ZIP_BASE = "geo:0,0?q=";
        final String QUERY_PARAM = "q";

        String location = PreferenceManager.getDefaultSharedPreferences(getActivity())
                .getString(getString(R.string.pref_location_key),
                        getString(R.string.pref_location_default));

        Uri uri = Uri.parse(LOCATION_ZIP_BASE).buildUpon()
                .appendQueryParameter(QUERY_PARAM,location).build();

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setData(uri);
        if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
            startActivity(intent);
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        updateWeather();
    }

    private void updateWeather() {
        String location = Utility.getPreferredLocation(getActivity());
        new FetchWeatherTask(getActivity(), mForecastAdapter).execute(location);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        mForecastAdapter = new ArrayAdapter<String>(
                getActivity(),
                R.layout.list_item_forecast,
                R.id.list_item_forecast_textview,
                new ArrayList<String>());

        ListView listView = (ListView) rootView.findViewById(R.id.listview_forecast);
        listView.setAdapter(mForecastAdapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
                String forecast = mForecastAdapter.getItem(position);
                Intent intent = new Intent(getActivity(), DetailActivity.class)
                        .putExtra(Intent.EXTRA_TEXT, forecast);
                startActivity(intent);
            }
        });
        return rootView;
    }



    @Override
    public android.support.v4.content.Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
        String startDate = WeatherContract.getDbDateString(new Date());

        String sortOrder = WeatherEntry.COLUMN_DATETEXT + " ASC";

        mLocation = Utility.getPreferredLocation(getActivity());
        Uri weatherForLocationUti = WeatherEntry.buildWeatherLocationWithStartDate(
                mLocation, startDate);

        return new CursorLoader(
                getActivity(),
                weatherForLocationUti,
                FORECAST_COLUMNS,
                null,
                null,
                sortOrder
        );
    }

    @Override
    public void onLoadFinished(android.support.v4.content.Loader<Cursor> cursorLoader, Cursor cursor) {

    }

    @Override
    public void onLoaderReset(android.support.v4.content.Loader<Cursor> cursorLoader) {

    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        getLoaderManager().initLoader(FORECAST_LOADER, null, this);
        super.onActivityCreated(savedInstanceState);
    }
}

Java Source Code List

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