1
2Android ElevationBasic Sample
3===================================
4
5This sample demonstrates ways to move a view in the z-axis using
6`setTranslationZ()`. This method was introduced in API Level 21 ('Lollipop').
7
8Introduction
9------------
10
11This sample uses two shapes, a circle and a square, and it demonstrates two
12alternative ways to move a view in the z-axis. The first shape, the circle,
13has a fixed elevation, which is defined in XML. The second view, the square,
14changes its elevation using [setTranslationZ()][1] when a user touches it:
15
16    shape2.setOnTouchListener(new View.OnTouchListener() {
17        @Override
18        public boolean onTouch(View view, MotionEvent motionEvent) {
19            int action = motionEvent.getActionMasked();
20            /* Raise view on ACTION_DOWN and lower it on ACTION_UP. */
21            switch (action) {
22                case MotionEvent.ACTION_DOWN:
23                    Log.d(TAG, "ACTION_DOWN on view.");
24                    view.setTranslationZ(120);
25                    break;
26                case MotionEvent.ACTION_UP:
27                    Log.d(TAG, "ACTION_UP on view.");
28                    view.setTranslationZ(0);
29                    break;
30                default:
31                    return false;
32            }
33            return true;
34        }
35    });
36
37The elevation reverts back once the touch is removed.
38
39[1]: https://developer.android.com/training/material/shadows-clipping.html#Elevation
40
41Pre-requisites
42--------------
43
44- Android SDK 27
45- Android Build Tools v27.0.2
46- Android Support Repository
47
48Screenshots
49-------------
50
51<img src="screenshots/fixed.png" height="400" alt="Screenshot"/> <img src="screenshots/raised.png" height="400" alt="Screenshot"/>
52
53Getting Started
54---------------
55
56This sample uses the Gradle build system. To build this project, use the
57"gradlew build" command or use "Import Project" in Android Studio.
58
59Support
60-------
61
62- Google+ Community: https://plus.google.com/communities/105153134372062985968
63- Stack Overflow: http://stackoverflow.com/questions/tagged/android
64
65If you've found an error in this sample, please file an issue:
66https://github.com/googlesamples/android-ElevationBasic
67
68Patches are encouraged, and may be submitted by forking this project and
69submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
70
71License
72-------
73
74Copyright 2017 The Android Open Source Project, Inc.
75
76Licensed to the Apache Software Foundation (ASF) under one or more contributor
77license agreements.  See the NOTICE file distributed with this work for
78additional information regarding copyright ownership.  The ASF licenses this
79file to you under the Apache License, Version 2.0 (the "License"); you may not
80use this file except in compliance with the License.  You may obtain a copy of
81the License at
82
83http://www.apache.org/licenses/LICENSE-2.0
84
85Unless required by applicable law or agreed to in writing, software
86distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
87WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
88License for the specific language governing permissions and limitations under
89the License.
90