Java tutorial
/* * Copyright (C) 2013 The Drycake Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.thedrycake.tempincity.ui; import java.net.MalformedURLException; import java.net.URL; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import android.annotation.TargetApi; import android.app.ActionBar; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.TextView; import com.thedrycake.tempincity.Constants; import com.thedrycake.tempincity.R; import com.thedrycake.tempincity.Settings; import com.thedrycake.tempincity.city.Cities; import com.thedrycake.tempincity.city.City; import com.thedrycake.tempincity.provider.AppContract.TemperatureEntity; import com.thedrycake.tempincity.service.TemperatureService; import com.thedrycake.tempincity.util.StringUtils; import com.thedrycake.tempincity.util.TempUtils; public class MainActivity extends FragmentActivity implements LoaderCallbacks<Cursor> { private static final String LOG_TAG = MainActivity.class.getSimpleName(); private TextView mTempTextView; private TextView mTempDateTextView; private String mIntentCityName; private final SimpleDateFormat mTempDateFormat; public MainActivity() { mTempDateFormat = new SimpleDateFormat("HH:mm", Locale.US); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setHomeButtonEnabled(); mTempTextView = (TextView) findViewById(R.id.temp); mTempTextView.setOnClickListener(new OnClickListener() { public void onClick(View v) { onTempClick(); } }); mTempDateTextView = (TextView) findViewById(R.id.temp_date); Intent intent = getIntent(); Bundle extras = intent != null ? intent.getExtras() : null; mIntentCityName = extras != null ? extras.getString(Constants.EXTRA_CITY_NAME) : null; getSupportLoaderManager().initLoader(0, null, this); } @Override protected void onResume() { super.onResume(); setTitle(); getSupportLoaderManager().restartLoader(0, null, this); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_update: TemperatureService.startService(this); return true; case R.id.menu_settings: startActivity(new Intent(this, SettingsActivity.class)); return true; default: return super.onOptionsItemSelected(item); } } public Loader<Cursor> onCreateLoader(int id, Bundle args) { CursorLoader cursorLoader = new CursorLoader(this, TemperatureEntity.CONTENT_URI, TemperatureEntity.PROJECTION_TEMP_AND_TEMP_DATE, TemperatureEntity.Columns.CITY_NAME + " = ?", new String[] { getCurrentCityName() }, null); return cursorLoader; } public void onLoadFinished(Loader<Cursor> loader, Cursor data) { setTemp(data); } public void onLoaderReset(Loader<Cursor> loader) { setTemp(null); } private String getCurrentCityName() { return !StringUtils.isNullOrEmpty(mIntentCityName) ? mIntentCityName : Settings.getCurrentCityName(this); } private void onTempClick() { City city = Cities.getCityByName(getCurrentCityName(), null); URL webAddress = null; try { webAddress = city != null ? city.getUserFriendlyWebAddress() : null; } catch (MalformedURLException e) { Log.e(LOG_TAG, "Incorrect user friendly web address", e); } if (webAddress != null) { Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(webAddress.toExternalForm())); if (intent.resolveActivity(getPackageManager()) != null) { startActivity(intent); } } } @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) private void setHomeButtonEnabled() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { getActionBar().setHomeButtonEnabled(false); } } private void setTitle() { setTitle(getCurrentCityName()); } @TargetApi(Build.VERSION_CODES.HONEYCOMB) private void setTitle(String cityName) { CharSequence title; if (!StringUtils.isNullOrEmpty(cityName)) { title = getText(R.string.temp_in) + " " + cityName; } else { title = getText(R.string.app_name); } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { final ActionBar actionBar = getActionBar(); actionBar.setTitle(title); } else { setTitle(title); } } private void setTemp(Cursor cursor) { if (cursor != null && cursor.moveToFirst()) { double temp = cursor.getDouble(cursor.getColumnIndex(TemperatureEntity.Columns.TEMP)); long tempDateInMillis = cursor.getLong(cursor.getColumnIndex(TemperatureEntity.Columns.TEMP_DATE)); setTemp(temp); setTempDate(tempDateInMillis); } else { setTempNotAvailable(); setTempDateNotAvailable(); } } private void setTemp(double temp) { mTempTextView.setText(TempUtils.convertAndFormat(temp, Settings.getCurrentTempUnit(this))); int textColorId = R.color.black; if (Settings.isChangeTextColorWithTemp(this)) { textColorId = temp > 0 ? R.color.temp_text_warm : R.color.temp_text_cold; } mTempTextView.setTextColor(getResources().getColor(textColorId)); } private void setTempNotAvailable() { mTempTextView.setText(R.string.not_available); mTempTextView.setTextColor(getResources().getColor(R.color.black)); } private void setTempDate(long tempDateInMillis) { setTempDate(new Date(tempDateInMillis)); } private void setTempDate(Date tempDate) { mTempDateTextView.setText(getText(R.string.updated_at) + " " + mTempDateFormat.format(tempDate)); } private void setTempDateNotAvailable() { mTempDateTextView.setText(getText(R.string.updated_at) + " " + getText(R.string.not_available)); } }