AndroidExec.gradle

/*
 * Copyright (c) 2016 IBM Corp. All rights reserved.
 *
 * 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.
 */

// Define AndroidExec as an external property for includers to be able to use it
ext.AndroidExec = AndroidExec

// A gradle Exec task that searches the Android tools locations for matching executables.
// Tasks of this type can only execute if sdk.dir is set in local.properties or the ANDROID_HOME
// environment variable is set. It will include the highest found version of the build-tools.
public class AndroidExec extends Exec {

    @Override
    Task configure(Closure closure) {
        Task toReturn = super.configure(closure)
        String androidPath = null;
        File localProperties = new File(getProject().getRootProject().getRootDir(), "local.properties")
        if (localProperties.exists()) {
            Properties properties = new Properties()
            localProperties.withInputStream { instr ->
                properties.load(instr)
            }
            androidPath = properties.getProperty('sdk.dir')
        }

        if(androidPath == null){
            androidPath = System.env.ANDROID_HOME
        }

        if (androidPath != null) {
            // Get the highest build tools version
            def btv = Arrays.asList(new File(androidPath + File.separator + "build-tools").list())
                    .sort().reverse().get(0)

            String[] androidToolsPaths = ["tools", "build-tools" + File.separator + btv, "platform-tools"]
            // Search the tools paths looking for a matching file to set as the executable
            for (String androidToolsPath : androidToolsPaths) {
                File toolsPath = new File(androidPath + File.separator + androidToolsPath);
                // Search the android paths
                String[] matchingExec = toolsPath.list(new FilenameFilter() {
                    @Override
                    boolean accept(File dir, String name) {
                        return name.equals(getExecutable());
                    }
                })
                if (matchingExec.length == 1) {
                    setExecutable(new File(toolsPath, matchingExec[0]))
                    break
                }
            }
        } else {
            doFirst {
                throw new TaskInstantiationException("ANDROID_HOME environment variable or " +
                        "local.properties sdk.dir definition did not exist. " +
                        "Unable to run tasks of type AndroidExec without these properties.")
            }
        }
        return toReturn
    }
}