Medium Pt1 - Material Card Elevation

MaterialCardTranslation.java

/** Copyright 2018, Guilherme Henrique Ramos da Silva
**
** Licensed under the Apache License, Version 2.0 (the "License"); 
** you may not use this file except in compliance with the License. 
** You may obtain a copy of the License at 
**
**     http://www.apache.org/licenses/LICENSE-2.0 
**
** Unless required by applicable law or agreed to in writing, software 
** distributed under the License is distributed on an "AS IS" BASIS, 
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
** See the License for the specific language governing permissions and 
** limitations under the License.
**
*/
public class MaterialCardTranslation extends MaterialCardView {

   private boolean isElevated = false;
    private int ANIM_DURATION = 250;

    public MaterialCardTranslation(Context context) {
        super(context);
    }

    public MaterialCardTranslation(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MaterialCardTranslation(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public boolean isElevated() {
        return isElevated;
    }

    public void setDuration(final int duration) {
        ANIM_DURATION = duration;
    }

    public void elevateCard(final boolean elevate, @Nullable final EndAction endAction) {
       dispatchElevateAnim(elevate, endAction);

    }

    public void simulateClickElevation(@Nullable final EndAction endAction) {
        dispatchElevateCompleteAnim(endAction);
    }

    private void dispatchElevateAnim(final boolean elevate, @Nullable final EndAction endAction) {
        if (elevate) {
            upAnim();
        } else {
            downAnim();
        }

        isElevated = elevate;

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                endAction.onEnd();
            }
        }, ANIM_DURATION);

    }

    private void dispatchElevateCompleteAnim(@Nullable final EndAction endAction) {
        if (isElevated || isLessThan21())
            return;

        final float posZ = getZ();

        animate().translationZ(posZ * 2).setDuration(ANIM_DURATION)
                .setInterpolator(new FastOutSlowInInterpolator())
                .withEndAction(new Runnable() {
                    @Override
                    public void run() {
                        downAnim();
                    }
                });

        if (endAction != null)
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    endAction.onEnd();
                }
            }, ANIM_DURATION * 2);
    }

    private void upAnim() {
        if (isLessThan21())
            return;
        animate().translationZ(getZ() * 2).setDuration(ANIM_DURATION)
                .setInterpolator(new FastOutSlowInInterpolator())
                .start();
    }

    private void downAnim() {
        if (isLessThan21())
            return;
        animate().translationZ(0).setDuration(ANIM_DURATION)
                .setInterpolator(new FastOutSlowInInterpolator())
                .start();
    }

    public interface EndAction {
        void onEnd();
    }

    private boolean isLessThan21() {
        return Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP;
    }

}