Android Open Source - android-wheel Slot Machine Activity

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License

The source code is released under:

Apache License

Java Source Code

package kankan.wheel.demo;
//  w  w w .  j a  v a2 s .  c om
import java.lang.ref.SoftReference;
import java.util.ArrayList;
import java.util.List;

import kankan.wheel.widget.OnWheelChangedListener;
import kankan.wheel.widget.OnWheelScrollListener;
import kankan.wheel.widget.WheelView;
import kankan.wheel.widget.adapters.AbstractWheelAdapter;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class SlotMachineActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.slot_machine_layout);
        initWheel(R.id.slot_1);
        initWheel(R.id.slot_2);
        initWheel(R.id.slot_3);

        Button mix = (Button)findViewById(R.id.btn_mix);
        mix.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mixWheel(R.id.slot_1);
                mixWheel(R.id.slot_2);
                mixWheel(R.id.slot_3);
            }
        });

        updateStatus();
    }

    // Wheel scrolled flag
    private boolean wheelScrolled = false;

    // Wheel scrolled listener
    OnWheelScrollListener scrolledListener = new OnWheelScrollListener() {
        public void onScrollingStarted(WheelView wheel) {
            wheelScrolled = true;
        }
        public void onScrollingFinished(WheelView wheel) {
            wheelScrolled = false;
            updateStatus();
        }
    };

    // Wheel changed listener
    private OnWheelChangedListener changedListener = new OnWheelChangedListener() {
        public void onChanged(WheelView wheel, int oldValue, int newValue) {
            if (!wheelScrolled) {
                updateStatus();
            }
        }
    };

    /**
     * Updates status
     */
    private void updateStatus() {
        TextView text = (TextView) findViewById(R.id.pwd_status);
        if (test()) {
            text.setText("Congratulation!");
        } else {
            text.setText("");
        }
    }

    /**
     * Initializes wheel
     * @param id the wheel widget Id
     */
    private void initWheel(int id) {
        WheelView wheel = getWheel(id);
        wheel.setViewAdapter(new SlotMachineAdapter(this));
        wheel.setCurrentItem((int)(Math.random() * 10));

        wheel.addChangingListener(changedListener);
        wheel.addScrollingListener(scrolledListener);
        wheel.setCyclic(true);
        wheel.setEnabled(false);
    }

    /**
     * Returns wheel by Id
     * @param id the wheel Id
     * @return the wheel with passed Id
     */
    private WheelView getWheel(int id) {
        return (WheelView) findViewById(id);
    }

    /**
     * Tests wheels
     * @return true
     */
    private boolean test() {
        int value = getWheel(R.id.slot_1).getCurrentItem();
        return testWheelValue(R.id.slot_2, value) && testWheelValue(R.id.slot_3, value);
    }

    /**
     * Tests wheel value
     * @param id the wheel Id
     * @param value the value to test
     * @return true if wheel value is equal to passed value
     */
    private boolean testWheelValue(int id, int value) {
        return getWheel(id).getCurrentItem() == value;
    }

    /**
     * Mixes wheel
     * @param id the wheel id
     */
    private void mixWheel(int id) {
        WheelView wheel = getWheel(id);
        wheel.scroll(-350 + (int)(Math.random() * 50), 2000);
    }

    /**
     * Slot machine adapter
     */
    private class SlotMachineAdapter extends AbstractWheelAdapter {
        // Image size
        final int IMAGE_WIDTH = 60;
        final int IMAGE_HEIGHT = 36;

        // Slot machine symbols
        private final int items[] = new int[] {
                android.R.drawable.star_big_on,
                android.R.drawable.stat_sys_warning,
                android.R.drawable.radiobutton_on_background,
                android.R.drawable.ic_delete
        };

        // Cached images
        private List<SoftReference<Bitmap>> images;

        // Layout inflater
        private Context context;

        /**
         * Constructor
         */
        public SlotMachineAdapter(Context context) {
            this.context = context;
            images = new ArrayList<SoftReference<Bitmap>>(items.length);
            for (int id : items) {
                images.add(new SoftReference<Bitmap>(loadImage(id)));
            }
        }

        /**
         * Loads image from resources
         */
        private Bitmap loadImage(int id) {
            Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), id);
            Bitmap scaled = Bitmap.createScaledBitmap(bitmap, IMAGE_WIDTH, IMAGE_HEIGHT, true);
            bitmap.recycle();
            return scaled;
        }

        @Override
        public int getItemsCount() {
            return items.length;
        }

        // Layout params for image view
        final LayoutParams params = new LayoutParams(IMAGE_WIDTH, IMAGE_HEIGHT);

        @Override
        public View getItem(int index, View cachedView, ViewGroup parent) {
            ImageView img;
            if (cachedView != null) {
                img = (ImageView) cachedView;
            } else {
                img = new ImageView(context);
            }
            img.setLayoutParams(params);
            SoftReference<Bitmap> bitmapRef = images.get(index);
            Bitmap bitmap = bitmapRef.get();
            if (bitmap == null) {
                bitmap = loadImage(items[index]);
                images.set(index, new SoftReference<Bitmap>(bitmap));
            }
            img.setImageBitmap(bitmap);

            return img;
        }
    }
}

Java Source Code List

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