Android Open Source - Lister Fab

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License

The source code is released under:
MIT License
If you think the Android project Lister listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package com.liamfruzyna.android.lister.Views;
//  w  w  w.  j  a  v  a  2 s .  c  om
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import com.nineoldandroids.animation.ObjectAnimator;
import com.nineoldandroids.view.ViewHelper;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.TranslateAnimation;

public class Fab extends View
{
    Context _context;
    Paint mButtonPaint, mDrawablePaint;
    Bitmap mBitmap;
    int mScreenHeight;
    float currentY;
    ;
    boolean mHidden = false;
    private Display display;

    public Fab(Context context, AttributeSet attributeSet)
    {
        super(context, attributeSet);
        _context = context;
        init(Color.WHITE);
    }

    @SuppressLint("NewApi")
    public Fab(Context context)
    {
        super(context);
        _context = context;
        init(Color.WHITE);
    }

    public void setFabColor(int fabColor)
    {
        init(fabColor);
    }

    public void setFabDrawable(Drawable fabDrawable)
    {
        Drawable myDrawable = fabDrawable;
        mBitmap = ((BitmapDrawable) myDrawable).getBitmap();
        invalidate();
    }

    @SuppressLint("NewApi")
    public void init(int fabColor)
    {
        setWillNotDraw(false);
        try
        {
            this.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        } catch (NoSuchMethodError e2)
        {
            // http://stackoverflow.com/questions/16990588/setlayertype-substitute-for-android-2-3-3
            try
            {
                Method setLayerTypeMethod = this.getClass().getMethod(
                        "setLayerType", new Class[]{int.class, Paint.class});
                if (setLayerTypeMethod != null)
                    setLayerTypeMethod.invoke(this, new Object[]{
                            LAYER_TYPE_SOFTWARE, null});
            } catch (NoSuchMethodException e)
            {
                e.printStackTrace();
            } catch (IllegalArgumentException e)
            {
                e.printStackTrace();
            } catch (IllegalAccessException e)
            {
                e.printStackTrace();
            } catch (InvocationTargetException e)
            {
                e.printStackTrace();
            }
        }

        mButtonPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mButtonPaint.setColor(fabColor);
        mButtonPaint.setStyle(Paint.Style.FILL);
        mButtonPaint
                .setShadowLayer(10.0f, 0.0f, 3.5f, Color.argb(100, 0, 0, 0));
        mDrawablePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        invalidate();

        WindowManager mWindowManager = (WindowManager) _context
                .getSystemService(Context.WINDOW_SERVICE);
        display = mWindowManager.getDefaultDisplay();
        Point size = getSize();
        mScreenHeight = size.y;
    }

    // http://stackoverflow.com/questions/10439033/getsize-not-supported-on-older-android-os-versions-getwidth-getheight-d
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    @SuppressWarnings("deprecation")
    protected Point getSize()
    {
        final Point point = new Point();

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2)
        {
            display.getSize(point);
        } else
        {
            point.x = display.getWidth();
            point.y = display.getHeight();
        }
        return point;
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        setClickable(true);
        canvas.drawCircle(getWidth() / 2, getHeight() / 2,
                (float) (getWidth() / 2.6), mButtonPaint);
        canvas.drawBitmap(mBitmap, (getWidth() - mBitmap.getWidth()) / 2,
                (getHeight() - mBitmap.getHeight()) / 2, mDrawablePaint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        if (event.getAction() == MotionEvent.ACTION_UP)
        {
            ViewHelper.setAlpha(this, 1.0f);
        } else if (event.getAction() == MotionEvent.ACTION_DOWN)
        {
            ViewHelper.setAlpha(this, 0.6f);
        }
        return super.onTouchEvent(event);
    }

    public int dpToPx(int dp)
    {
        DisplayMetrics displayMetrics = getContext().getResources()
                .getDisplayMetrics();
        int px = Math.round(dp
                * (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT));
        return px;
    }

    public void hideFab()
    {
        try
        {
            if (mHidden == false)
            {
                currentY = ViewHelper.getY(this);
                ObjectAnimator mHideAnimation = ObjectAnimator.ofFloat(this,
                        "Y", mScreenHeight);
                mHideAnimation.setInterpolator(new AccelerateInterpolator());
                mHideAnimation.start();
            }
        } catch (Exception e)
        {
            currentY = ViewHelper.getY(this);
            Animation animation = new TranslateAnimation(0.0f, 0.0f, 0.0f,
                    currentY);
            animation.setDuration(1000);
            animation.setFillAfter(true);
            startAnimation(animation);
            setVisibility(View.GONE);
        }
        mHidden = true;
    }

    public void showFab()
    {
        try
        {
            if (mHidden == true)
            {
                ObjectAnimator mShowAnimation = ObjectAnimator.ofFloat(this,
                        "Y", currentY);
                mShowAnimation.setInterpolator(new DecelerateInterpolator());
                mShowAnimation.start();

            }
        } catch (Exception e)
        {
            setVisibility(View.VISIBLE);
            currentY = ViewHelper.getY(this);
            Animation animation = new TranslateAnimation(0.0f, 0.0f, currentY,
                    0.0f);
            animation.setDuration(500);
            this.startAnimation(animation);
        }
        mHidden = false;
    }
}
Java Source Code List
