Include last git commit sha-1 hash and comment in Android app

build.gradle

task gitCommitInfo(dependsOn: 'compileDebugSources') {
    def gitInfo = 'git log --oneline -n 1'.execute().text.trim()
    def path = "${project.android.sourceSets.debug.java.srcDirs.first()}" + "<path_to>/VersionUtil.java"
    def updatedContent = new File(path).getText('UTF-8').replaceAll("\".*\"", "\"${gitInfo}\"")
    new File(path).write(updatedContent, 'UTF-8')
}

tasks.assembleDebug.doLast {
    def path = "${project.android.sourceSets.debug.java.srcDirs.first()}" + "<path_to>/VersionUtil.java"
    def updatedContent = new File(path).getText('UTF-8').replaceAll("\".*\"", "\"info\"")
    new File(path).write(updatedContent, 'UTF-8')
}

SomeFile.java

public void setCommitInfo() {
    if (BuildConfig.DEBUG) {
        textView.setText(VersionUtil.COMMIT_INFO);
    }
}

VersionUtil.java

package your.package;

// Should be under app/src/debug/<package>/VersionUtil.java
public class VersionUtil {

    public static final String COMMIT_INFO = "info";

}