Android Open Source - Joetz-Android-V2 Activity Utils

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License

The source code is released under:
GNU General Public License
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Java Source Code

package com.example.jens.myapplication.util;
/*w  w w. j  av  a  2 s. c  o m*/
import android.app.Activity;
import android.app.DatePickerDialog;
import android.content.Context;
import android.content.res.Configuration;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.DatePicker;

import com.example.jens.myapplication.domain.Person;

import org.joda.time.DateTime;

/**
 * Created by Sam on 9/11/2014.
 */
public class ActivityUtils {
    /**
     * Opens a date picker for a person's date of birth
     * @param context
     * @param person The person whose date of birth should be used as a starting point of the
     *               datepicker
     * @param callback the callback that happens when the datepicker is finished
     */
    public static void chooseDateOfBirth(Context context, Person person, final OnDateChosenListener callback){
        DateTime startDate;
        if(person == null || person.getDateOfBirth() == null){
            startDate = DateTime.now();
        }else{
            startDate = person.getDateOfBirth();
        }
        int startYear = startDate.getYear();
        int startMonth = startDate.getMonthOfYear() - 1;
        int startDay = startDate.getDayOfMonth();

        DatePickerDialog.OnDateSetListener onDateSetCallback = new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                if(view.isShown()){
                    callback.onDateChosen(year, monthOfYear + 1, dayOfMonth);
                }
            }
        };

        DatePickerDialog dialog = new DatePickerDialog(context,
                onDateSetCallback, startYear, startMonth, startDay);
        dialog.show();
    }

    /**
     * Hides the keyboard
     * @param activity The activity currently active
     */
    public static void hideKeyboardFromActivity(Activity activity){
        View v = activity.getCurrentFocus();
        if(v != null){
            InputMethodManager inputManager = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
            inputManager.hideSoftInputFromWindow(v.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
        }
    }

    /**
     * Get the span count for a gridlayoutmanager for example. returns how many columns the
     * list of items should contain.
     * @param activity
     * @return The amount of columns the screen can fit
     */
    public static int getSpanCount(Activity activity){
        double diagonalInches = getDisplayInches(activity);
        int orientation = getDisplayOrientation(activity);

        if (diagonalInches >= 10) {
            if(orientation == Configuration.ORIENTATION_PORTRAIT){
                return 3;
            }
            else
            {
                return 4;
            }
        }
        else if (diagonalInches >= 7) {
            if(orientation == Configuration.ORIENTATION_PORTRAIT){
                return 2;
            }
            else
            {
                return 3;
            }
        }

        else {
            if(orientation == Configuration.ORIENTATION_PORTRAIT){
                return 1;
            }
            else
            {
                return 1;
            }

        }

    }

    private static int getDisplayOrientation(Activity activity){
        return activity.getResources().getConfiguration().orientation;
    }

    private static double getDisplayInches(Activity activity){
        DisplayMetrics metrics = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);

        int widthPixels = metrics.widthPixels;
        int heightPixels = metrics.heightPixels;

        float widthDpi = metrics.xdpi;
        float heightDpi = metrics.ydpi;

        float widthInches = widthPixels / widthDpi;
        float heightInches = heightPixels / heightDpi;

        double diagonalInches = Math.sqrt((widthInches * widthInches)+ (heightInches * heightInches));

        return diagonalInches;
    }

    public interface OnDateChosenListener{
        /**
         * Called when a date was chosen
         * @param year Year that was chosen
         * @param monthOfYear Month of the year of the date that was chosen
         * @param dayOfMonth Day of the month of the date that was chosen
         */
        public void onDateChosen(int year, int monthOfYear, int dayOfMonth);
    }
}
Java Source Code List
