{"id":2971,"date":"2017-11-17T14:23:50","date_gmt":"2017-11-17T14:23:50","guid":{"rendered":"http:\/\/support.loginextsolutions.com\/?p=2971"},"modified":"2026-01-28T09:37:55","modified_gmt":"2026-01-28T09:37:55","slug":"internationalization-4","status":"publish","type":"post","link":"https:\/\/support.loginextsolutions.com\/index.php\/2017\/11\/17\/internationalization-4\/","title":{"rendered":"ProGuard"},"content":{"rendered":"\n\n\n\t
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ProGuard is an open-source command-line tool that helps you shrink, optimize, and obfuscate Java code. It can detect and remove unused instructions and optimize bytecode, making your Android application smaller and harder to reverse engineer. ProGuard runs automatically when you build your app in release mode and is distributed as part of the Android SDK.
It is licensed under the GNU General Public License, version 2.

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ProGuard Features<\/h4>\n

Obfuscation<\/span>
\n<\/strong><\/p>\n

ProGuard obfuscates Java and Android programs by renaming classes, fields, and methods using meaningless names, making it harder to reverse-engineer the final application.<\/p>\n

Optimization<\/strong><\/span><\/p>\n

Besides removing unused instructions from the compiled bytecode, ProGuard optimizes it using techniques, such as control flow analysis, data-flow analysis, partial evaluation, static single assignment, global value numbering, and liveness analysis.<\/p>\n

Code Shrinking<\/strong><\/span><\/p>\n

Removes unused code (classes, methods, fields) including from third-party libraries.<\/p>\n

Usage<\/strong><\/span><\/p>\n

Works with Java Micro Edition and Android.<\/p>\n

Code and Resource Shrinking<\/strong><\/h4>\n

Code shrinking is available with ProGuard, which detects and removes unused classes, fields, methods, and attributes from your packaged app, including those from included code libraries. ProGuard also optimizes the bytecode, removes unused code instructions, and obfuscates the remaining classes, fields, and methods with short names. The obfuscated code makes your APK difficult to reverse engineer, which is especially valuable when your app uses security-sensitive features, such as licensing verification.<\/p>\n

Resource shrinking is available with the Android plugin for Gradle, which removes unused resources from your packaged app, including unused resources in code libraries. It works in conjunction with code shrinking such that once unused code has been removed, any resources no longer referenced can be safely removed as well.<\/p>\n

We can use ProGuard for code and resource shrink as follows:<\/p>\n

    \n
  1. Code Shrink:
    \nTo enable code shrinking with ProGuard, set minifyEnabled = true to the appropriate build type in our build.gradle file. For example, the following snippet from a build.gradle file enables code shrinking for the release build:
    \nandroid {
    \n&nbsp&nbsp&nbspbuildTypes {
    \n&nbsp&nbsp&nbsp&nbsp&nbsprelease {
    \n&nbsp&nbsp&nbsp&nbsp&nbsp&nbspminifyEnabled true
    \n&nbsp&nbsp&nbsp&nbsp&nbsp&nbspproguardFiles getDefaultProguardFile(\u2018proguard-android.txt\u2019), \u2018proguard-rules.pro\u2019
    \n&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp}
    \n&nbsp&nbsp&nbsp&nbsp&nbsp}
    \n&nbsp&nbsp&nbsp&nbsp&nbsp\u2026
    \n}
    \n<\/code><\/li>\n
  2. Resource Shrink:Resource shrinking works only in conjunction with code shrinking. After the code
    \nshrinker removes all unused code, the resource shrinker can identify which resources the app still uses. This is especially true when you add code libraries that include resources\u2014you must remove unused library code so the library resources become unreferenced and, thus, removable by the resource shrinker. To enable resource shrinking, set the shrink Resources property to true in your build.gradle file
    \n(alongside minifyEnabled for code shrinking). For example:

    <\/p>\n

    android {
    \n&nbsp&nbsp&nbspbuildTypes {
    \n&nbsp&nbsp&nbsp&nbsp&nbsprelease {
    \n&nbsp&nbsp&nbsp&nbsp&nbsp&nbspshrinkResources true
    \n&nbsp&nbsp&nbsp&nbsp&nbsp&nbspminifyEnabled true
    \n&nbsp&nbsp&nbsp&nbsp&nbsp&nbspproguardFiles getDefaultProguardFile(\u2018proguard-android.txt\u2019), \u2018proguard-rules.pro\u2019
    \n&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp}
    \n&nbsp&nbsp&nbsp&nbsp&nbsp}
    \n&nbsp&nbsp&nbsp&nbsp&nbsp\u2026
    \n}
    \n<\/code><\/p><\/li>\n<\/ol>\n

    Common ProGuard Rules<\/h3>\n