This sample shows how to draw a rounded corner background on text. It supports the following cases:
Depending on the position of the text, we need to draw four different drawables as text backgrounds:
The four drawables that need to be drawn depending on the position of the text:
To position the background, we need to:
All of these can be computed based on the text Layout. To render the background behind the text we need access to the Canvas. A custom TextView has access to all of the information necessary to position the drawables and render them.
Our solution involves splitting our problem into 4 parts and creating classes dealing with them individually:
TextRoundedBgHelperinterface and its implementations:
RoundedBgTextView, a class that extends
AppCompatTextView, reads the attributes with the help of
onDrawwhere it uses
TextRoundedBgHelperto draw the background.
Clone this repository, enter the top level directory and run
./gradlew tasks to get an overview of all the tasks available for this project.
Some important tasks are:
assembleDebug - Assembles all Debug builds. installDebug - Installs the Debug build. connectedAndroidTest - Installs and runs the tests for Debug build on connected devices. test - Run all unit tests.
If you've found an error in this sample, please file an issue: https://github.com/googlesamples/android-text/issues
Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub.
Copyright 2018 The Android Open Source Project 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.