Android Open Source - modern-art-ui Main Activity

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Back to project page modern-art-ui.

License

The source code is released under:

MIT License

Java Source Code

package course.lab.modernartui.activities;
//from  w  w w .jav  a2s  . c  o  m
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.SeekBar;

import course.lab.modernartui.R;
import course.lab.modernartui.dialogs.MoreInformationDialog;

/**
 * Contains the main activity of the application. It contains a palette that holds several
 * rectangular views, each with its own background color and a seek bar at the bottom, dragging
 * which changes the color of each rectangular (except the white and gray ones).
 *
 * @author Tilen Faganel
 * @version 1.0.1
 * @since 1.0.0
 */
public class MainActivity extends Activity {

    private static final String TAG = MainActivity.class.getName();

    private RelativeLayout palette;

    /**
     * Called when the activity is starting.
     * <p/>
     * Sets up the main activity content view and registers a change handler for the activities
     * seek bar.
     *
     * @param savedInstanceState If the activity is being re-initialized after
     *                           previously being shut down then this Bundle contains the data it
     *                           most
     *                           recently supplied.  <b><i>Note: Otherwise it is null.</i></b>
     */
    @Override
    protected void onCreate ( Bundle savedInstanceState ) {

        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_main );

        palette = ( RelativeLayout ) findViewById( R.id.palette );
        SeekBar seek = ( SeekBar ) findViewById( R.id.seekBar );

        seek.setOnSeekBarChangeListener( new SeekBar.OnSeekBarChangeListener() {

            /**
             * Notification that the seek bar progress level has changed.
             *
             * When the seek bar state changes, loop through the child's of the palette view and
             * change each individuals view color based on the percentage that the seek bar is
             * currently at. Ignores views that are either white or some shade of gray.
             *
             * @param seekBar  The SeekBar whose progress has changed
             * @param progress The current progress level. This will be in the range 0..100
             * @param fromUser True if the progress change was initiated by the user.
             */
            @Override
            public void onProgressChanged ( SeekBar seekBar, int progress, boolean fromUser ) {

                for ( int i = 0; i < palette.getChildCount(); i++ ) {
                    View child = palette.getChildAt( i );

                    int originalColor = Color.parseColor( ( String ) child.getTag() );
                    int invertedColor = ( 0x00FFFFFF - ( originalColor | 0xFF000000 ) ) |
                                        ( originalColor & 0xFF000000 );

                    if ( getResources().getColor( R.color.white ) != originalColor &&
                         getResources().getColor( R.color.lightgray ) != originalColor ) {

                        int origR = ( originalColor >> 16 ) & 0x000000FF;
                        int origG = ( originalColor >> 8 ) & 0x000000FF;
                        int origB = originalColor & 0x000000FF;

                        int invR = ( invertedColor >> 16 ) & 0x000000FF;
                        int invG = ( invertedColor >> 8 ) & 0x000000FF;
                        int invB = invertedColor & 0x000000FF;

                        child.setBackgroundColor( Color.rgb(
                                ( int ) ( origR + ( invR - origR ) * ( progress / 100f ) ),
                                ( int ) ( origG + ( invG - origG ) * ( progress / 100f ) ),
                                ( int ) ( origB + ( invB - origB ) * ( progress / 100f ) ) ) );
                        child.invalidate();
                    }
                }
            }

            /**
             * Currently used for nothing.
             *
             * @param seekBar The SeekBar in which the touch gesture began
             */
            @Override
            public void onStartTrackingTouch ( SeekBar seekBar ) {

            }

            /**
             * Currently used for nothing.
             *
             * @param seekBar The SeekBar in which the touch gesture began
             */
            @Override
            public void onStopTrackingTouch ( SeekBar seekBar ) {

            }
        } );
    }

    /**
     * Initialize the contents of the Activity's standard options menu.  Menu items are placed
     * in to <var>menu</var>.
     * <p/>
     * <p>This is only called once, the first time the options menu is
     * displayed.</p>
     *
     * @param menu The options menu in which the items are placed.
     * @return Returns true for the menu to be displayed;
     * if it returns false it will not be shown.
     */
    @Override
    public boolean onCreateOptionsMenu ( Menu menu ) {

        getMenuInflater().inflate( R.menu.menu_main, menu );
        return true;
    }

    /**
     * Evaluates when the user clicks the more information options menu.
     * <p/>
     * Shows the more information dialog fragment.
     *
     * @param item The menu item that was clicked
     */
    public void showDialog ( MenuItem item ) {

        new MoreInformationDialog().show( getFragmentManager(), TAG );
    }
}

Java Source Code List

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