Android ElevationBasic Sample

This sample demonstrates ways to move a view in the z-axis using setTranslationZ(). This method was introduced in API Level 21 (‘Lollipop’).

Introduction

This sample uses two shapes, a circle and a square, and it demonstrates two alternative ways to move a view in the z-axis. The first shape, the circle, has a fixed elevation, which is defined in XML. The second view, the square, changes its elevation using setTranslationZ() when a user touches it:

shape2.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {
        int action = motionEvent.getActionMasked();
        /* Raise view on ACTION_DOWN and lower it on ACTION_UP. */
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                Log.d(TAG, "ACTION_DOWN on view.");
                view.setTranslationZ(120);
                break;
            case MotionEvent.ACTION_UP:
                Log.d(TAG, "ACTION_UP on view.");
                view.setTranslationZ(0);
                break;
            default:
                return false;
        }
        return true;
    }
});

The elevation reverts back once the touch is removed.

Pre-requisites

  • Android SDK v21
  • Android Build Tools v21.1.1
  • Android Support Repository

Screenshots

Getting Started

This sample uses the Gradle build system. To build this project, use the “gradlew build” command or use “Import Project” in Android Studio.

Support

If you've found an error in this sample, please file an issue: https://github.com/googlesamples/android-ElevationBasic

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.

License

Copyright 2014 The Android Open Source Project, Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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.