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      1 Android ElevationBasic Sample
      2 ===================================
      3 
      4 This sample demonstrates ways to move a view in the z-axis using
      5 `setTranslationZ()`. This method was introduced in API Level 21 ('Lollipop').
      6 
      7 Introduction
      8 ------------
      9 
     10 This sample uses two shapes, a circle and a square, and it demonstrates two
     11 alternative ways to move a view in the z-axis. The first shape, the circle,
     12 has a fixed elevation, which is defined in XML. The second view, the square,
     13 changes its elevation using [setTranslationZ()][1] when a user touches it:
     14 
     15     shape2.setOnTouchListener(new View.OnTouchListener() {
     16         @Override
     17         public boolean onTouch(View view, MotionEvent motionEvent) {
     18             int action = motionEvent.getActionMasked();
     19             /* Raise view on ACTION_DOWN and lower it on ACTION_UP. */
     20             switch (action) {
     21                 case MotionEvent.ACTION_DOWN:
     22                     Log.d(TAG, "ACTION_DOWN on view.");
     23                     view.setTranslationZ(120);
     24                     break;
     25                 case MotionEvent.ACTION_UP:
     26                     Log.d(TAG, "ACTION_UP on view.");
     27                     view.setTranslationZ(0);
     28                     break;
     29                 default:
     30                     return false;
     31             }
     32             return true;
     33         }
     34     });
     35 
     36 The elevation reverts back once the touch is removed.
     37 
     38 [1]: https://developer.android.com/training/material/shadows-clipping.html#Elevation
     39 
     40 Pre-requisites
     41 --------------
     42 
     43 - Android SDK v21
     44 - Android Build Tools v21.1.1
     45 - Android Support Repository
     46 
     47 Screenshots
     48 -------------
     49 
     50 <img src="screenshots/fixed.png" height="400" alt="Screenshot"/> <img src="screenshots/raised.png" height="400" alt="Screenshot"/> 
     51 
     52 Getting Started
     53 ---------------
     54 
     55 This sample uses the Gradle build system. To build this project, use the
     56 "gradlew build" command or use "Import Project" in Android Studio.
     57 
     58 Support
     59 -------
     60 
     61 - Google+ Community: https://plus.google.com/communities/105153134372062985968
     62 - Stack Overflow: http://stackoverflow.com/questions/tagged/android
     63 
     64 If you've found an error in this sample, please file an issue:
     65 https://github.com/googlesamples/android-ElevationBasic
     66 
     67 Patches are encouraged, and may be submitted by forking this project and
     68 submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
     69 
     70 License
     71 -------
     72 
     73 Copyright 2014 The Android Open Source Project, Inc.
     74 
     75 Licensed to the Apache Software Foundation (ASF) under one or more contributor
     76 license agreements.  See the NOTICE file distributed with this work for
     77 additional information regarding copyright ownership.  The ASF licenses this
     78 file to you under the Apache License, Version 2.0 (the "License"); you may not
     79 use this file except in compliance with the License.  You may obtain a copy of
     80 the License at
     81 
     82 http://www.apache.org/licenses/LICENSE-2.0
     83 
     84 Unless required by applicable law or agreed to in writing, software
     85 distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
     86 WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
     87 License for the specific language governing permissions and limitations under
     88 the License.
     89