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/*
* Copyright 2013 The Android Open Source 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.example.android.activityinstrumentation;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.app.Activity;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import java.util.ArrayList;
import java.util.Arrays;
/**
* Basic activity with a spinner. The spinner should persist its position to disk every time a
* new selection is made.
*/
public class MainActivity extends Activity {
/** Shared preferences key: Holds spinner position. Must not be negative. */
private static final String PREF_SPINNER_POS = "spinner_pos";
/** Magic constant to indicate that no value is stored for PREF_SPINNER_POS. */
private static final int PREF_SPINNER_VALUE_ISNULL = -1;
/** Values for display in spinner. */
private static final String[] SPINNER_VALUES = new String[] {
"Select Weather...", "Sunny", "Partly Cloudy", "Cloudy", "Rain", "Snow", "Hurricane"};
// Constants representing each of the options in SPINNER_VALUES. Declared package-private
// so that they can be accessed from our test suite.
static final int WEATHER_NOSELECTION = 0;
static final int WEATHER_SUNNY = 1;
static final int WEATHER_PARTLY_CLOUDY = 2;
static final int WEATHER_CLOUDY = 3;
static final int WEATHER_RAIN = 4;
static final int WEATHER_SNOW = 5;
static final int WEATHER_HURRICANE = 6;
/** Handle to default shared preferences for this activity. */
private SharedPreferences mPrefs;
/** Handle to the spinner in this Activity's layout. */
private Spinner mSpinner;
/**
* Setup activity state.
*
* @param savedInstanceState
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Inflate UI from res/layout/activity_main.xml
setContentView(R.layout.activity_main);
// Get handle to default shared preferences for this activity
mPrefs = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
// Populate spinner with sample values from an array
mSpinner = (Spinner) findViewById(R.id.spinner);
mSpinner.setAdapter(
new ArrayAdapter<String>(
this, // Context
android.R.layout.simple_list_item_1, // Layout
new ArrayList<String>(Arrays.asList(SPINNER_VALUES)) // Data source
));
// Read in a sample value, if it's not set.
int selection = mPrefs.getInt(PREF_SPINNER_POS, PREF_SPINNER_VALUE_ISNULL);
if (selection != PREF_SPINNER_VALUE_ISNULL) {
mSpinner.setSelection(selection);
}
// Callback to persist spinner data whenever a new value is selected. This will be the
// focus of our sample unit test.
mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
// The methods below commit the ID of the currently selected item in the spinner
// to disk, using a SharedPreferences file.
//
// Note: A common mistake here is to forget to call .commit(). Try removing this
// statement and running the tests to watch them fail.
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
mPrefs.edit().putInt(PREF_SPINNER_POS, position);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
mPrefs.edit().remove(PREF_SPINNER_POS).commit();
}
});
}
}
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