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package your_package;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.OvershootInterpolator;
import android.widget.FrameLayout;
public class FloatingActionButton extends View {
final static OvershootInterpolator overshootInterpolator = new OvershootInterpolator();
final static AccelerateInterpolator accelerateInterpolator = new AccelerateInterpolator();
Context context;
Paint mButtonPaint;
Paint mDrawablePaint;
Bitmap mBitmap;
boolean mHidden = false;
public FloatingActionButton(Context context) {
super(context);
this.context = context;
init(Color.WHITE);
}
public void setFloatingActionButtonColor(int FloatingActionButtonColor) {
init(FloatingActionButtonColor);
}
public void setFloatingActionButtonDrawable(Drawable FloatingActionButtonDrawable) {
mBitmap = ((BitmapDrawable) FloatingActionButtonDrawable).getBitmap();
invalidate();
}
public void init(int FloatingActionButtonColor) {
setWillNotDraw(false);
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
mButtonPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mButtonPaint.setColor(FloatingActionButtonColor);
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();
}
@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) {
setAlpha(1.0f);
} else if (event.getAction() == MotionEvent.ACTION_DOWN) {
setAlpha(0.6f);
}
return super.onTouchEvent(event);
}
public void hideFloatingActionButton() {
if (!mHidden) {
ObjectAnimator scaleX = ObjectAnimator.ofFloat(this, "scaleX", 1, 0);
ObjectAnimator scaleY = ObjectAnimator.ofFloat(this, "scaleY", 1, 0);
AnimatorSet animSetXY = new AnimatorSet();
animSetXY.playTogether(scaleX, scaleY);
animSetXY.setInterpolator(accelerateInterpolator);
animSetXY.setDuration(100);
animSetXY.start();
mHidden = true;
}
}
public void showFloatingActionButton() {
if (mHidden) {
ObjectAnimator scaleX = ObjectAnimator.ofFloat(this, "scaleX", 0, 1);
ObjectAnimator scaleY = ObjectAnimator.ofFloat(this, "scaleY", 0, 1);
AnimatorSet animSetXY = new AnimatorSet();
animSetXY.playTogether(scaleX, scaleY);
animSetXY.setInterpolator(overshootInterpolator);
animSetXY.setDuration(200);
animSetXY.start();
mHidden = false;
}
}
public boolean isHidden() {
return mHidden;
}
static public class Builder {
private FrameLayout.LayoutParams params;
private final Activity activity;
int gravity = Gravity.BOTTOM | Gravity.RIGHT; // default bottom right
Drawable drawable;
int color = Color.WHITE;
int size = 0;
float scale = 0;
public Builder(Activity context) {
scale = context.getResources().getDisplayMetrics().density;
size = convertToPixels(72, scale); // default size is 72dp by 72dp
params = new FrameLayout.LayoutParams(size, size);
params.gravity = gravity;
this.activity = context;
}
/**
* Sets the gravity for the FAB
*/
public Builder withGravity(int gravity) {
this.gravity = gravity;
return this;
}
/**
* Sets the margins for the FAB in dp
*/
public Builder withMargins(int left, int top, int right, int bottom) {
params.setMargins(
convertToPixels(left, scale),
convertToPixels(top, scale),
convertToPixels(right, scale),
convertToPixels(bottom, scale));
return this;
}
/**
* Sets the FAB drawable
*/
public Builder withDrawable(final Drawable drawable) {
this.drawable = drawable;
return this;
}
/**
* Sets the FAB color
*/
public Builder withButtonColor(final int color) {
this.color = color;
return this;
}
/**
* Sets the FAB size in dp
*/
public Builder withButtonSize(int size) {
size = convertToPixels(size, scale);
params = new FrameLayout.LayoutParams(size, size);
return this;
}
public FloatingActionButton create() {
final FloatingActionButton button = new FloatingActionButton(activity);
button.setFloatingActionButtonColor(this.color);
button.setFloatingActionButtonDrawable(this.drawable);
params.gravity = this.gravity;
ViewGroup root = (ViewGroup) activity.findViewById(android.R.id.content);
root.addView(button, params);
return button;
}
// The calculation (value * scale + 0.5f) is a widely used to convert to dps to pixel units
// based on density scale
// see developer.android.com (Supporting Multiple Screen Sizes)
private int convertToPixels(int dp, float scale){
return (int) (dp * scale + 0.5f) ;
}
}
}
FloatingActionButton fabButton = new FloatingActionButton.Builder(this)
.withDrawable(getResources().getDrawable(R.drawable.ic_action_add))
.withButtonColor(Color.WHITE)
.withGravity(Gravity.BOTTOM | Gravity.RIGHT)
.withMargins(0, 0, 16, 16)
.create();
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