Add option to keep intermediate files

Author: niranjan94

app/src/androidTest/kotlin/com/njlabs/showjava/test/DecompilerTestBase.kt

@@ -88,6 +88,7 @@ abstract class DecompilerTestBase {
     fun testDecompiler() {
         val data = BaseDecompiler.formData(hashMapOf(
             "shouldIgnoreLibs" to true,
+            "keepIntermediateFiles" to true,
             "chunkSize" to 2000,
             "maxAttempts" to 1,
             "memoryThreshold" to 80,

app/src/main/kotlin/com/njlabs/showjava/activities/decompiler/DecompilerActivity.kt

@@ -189,6 +189,7 @@ class DecompilerActivity : BaseActivity() {
             "maxAttempts" to userPreferences.maxAttempts,
             "chunkSize" to userPreferences.chunkSize,
             "memoryThreshold" to userPreferences.memoryThreshold,
+            "keepIntermediateFiles" to userPreferences.keepIntermediateFiles,
             "decompiler" to decompiler,
             "name" to packageInfo.name,
             "label" to packageInfo.label,

app/src/main/kotlin/com/njlabs/showjava/decompilers/BaseDecompiler.kt

@@ -51,15 +51,17 @@ abstract class BaseDecompiler(val context: Context, val data: Data) {
     private var id = data.getString("id")
     private var processNotifier: ProcessNotifier? = null
     private var runAttemptCount: Int = 0
-    protected var outOfMemory: Boolean = false
+    protected var outOfMemory = false
 
     protected val decompiler = data.getString("decompiler")
     protected val type = PackageInfo.Type.values()[data.getInt("type", 0)]
     private val maxAttempts = data.getInt("maxAttempts", UserPreferences.DEFAULTS.MAX_ATTEMPTS)
     private val memoryThreshold = data.getInt("memoryThreshold", 80)
 
-    protected val packageName: String = data.getString("name").toString()
-    protected val packageLabel: String = data.getString("label").toString()
+    protected val packageName = data.getString("name").toString()
+    protected val packageLabel = data.getString("label").toString()
+
+    protected val keepIntermediateFiles = data.getBoolean("keepIntermediateFiles", UserPreferences.DEFAULTS.KEEP_INTERMEDIATE_FILES)
 
     protected val workingDirectory: File = appStorage.resolve("sources/$packageName/")
     protected val cacheDirectory: File = appStorage.resolve("sources/.cache/")

app/src/main/kotlin/com/njlabs/showjava/decompilers/JarExtractionWorker.kt

@@ -220,7 +220,10 @@ class JarExtractionWorker(context: Context, data: Data) : BaseDecompiler(context
                         .verbose(verbose)
                     dex2jar.exceptionHandler = dexExceptionHandlerMod
                     dex2jar.to(outputJarFiles.resolve("$index.jar"))
-                    outputDexFile.delete()
+
+                    if (!keepIntermediateFiles) {
+                        outputDexFile.delete()
+                    }
                 }
             }
         }

app/src/main/kotlin/com/njlabs/showjava/decompilers/JavaExtractionWorker.kt

@@ -79,7 +79,7 @@ class JavaExtractionWorker(context: Context, data: Data) : BaseDecompiler(contex
         val jadx = JadxDecompiler(args)
         jadx.load()
         jadx.saveSources()
-        if (dexInputFiles.exists() && dexInputFiles.isDirectory) {
+        if (dexInputFiles.exists() && dexInputFiles.isDirectory && !keepIntermediateFiles) {
             dexInputFiles.deleteRecursively()
         }
     }
@@ -134,11 +134,11 @@ class JavaExtractionWorker(context: Context, data: Data) : BaseDecompiler(contex
             return exit(e)
         }
 
-        if (outputDexFiles.exists() && outputDexFiles.isDirectory) {
+        if (outputDexFiles.exists() && outputDexFiles.isDirectory && !keepIntermediateFiles) {
             outputDexFiles.deleteRecursively()
         }
 
-        if (outputJarFiles.exists() && outputJarFiles.isDirectory) {
+        if (outputJarFiles.exists() && outputJarFiles.isDirectory && !keepIntermediateFiles) {
             outputJarFiles.deleteRecursively()
         }
 

app/src/main/kotlin/com/njlabs/showjava/utils/UserPreferences.kt

@@ -38,6 +38,7 @@ class UserPreferences(private val prefs: SharedPreferences) {
             const val SHOW_SYSTEM_APPS = false
             const val MEMORY_THRESHOLD = 80
             const val IGNORE_LIBRARIES = true
+            const val KEEP_INTERMEDIATE_FILES = false
             const val CHUNK_SIZE = 500
             const val MAX_ATTEMPTS = 2
         }
@@ -46,6 +47,9 @@ class UserPreferences(private val prefs: SharedPreferences) {
     val ignoreLibraries: Boolean
         get() = prefs.getBoolean("ignoreLibraries", DEFAULTS.IGNORE_LIBRARIES)
 
+    val keepIntermediateFiles: Boolean
+        get() = prefs.getBoolean("keepIntermediateFiles", DEFAULTS.KEEP_INTERMEDIATE_FILES)
+
     val customFont: Boolean
         get() = prefs.getBoolean("customFont", DEFAULTS.CUSTOM_FONT)
 

app/src/main/res/values/strings.xml

@@ -177,4 +177,6 @@
     <string name="genericError">An unexpected error occurred</string>
     <string name="errorLoadingFiles">An error occurred while loading files</string>
     <string name="decompilersUnavailable">JaDX and Fernflower decompilers are available only on android devices running Android 7.0 and above.</string>
+    <string name="keepIntermediateFiles">Keep intermediate files</string>
+    <string name="keepIntermediateFilesSummary">Do not delete dex &amp; jar files created during the decompilation</string>
 </resources>

app/src/main/res/xml/preferences.xml

@@ -31,6 +31,13 @@
             android:summary="@string/ignoreLibrariesPreferenceSummary"
             android:title="@string/speedUpDecompile" />
 
+        <SwitchPreference
+            app:iconSpaceReserved="false"
+            android:key="keepIntermediateFiles"
+            android:defaultValue="false"
+            android:summary="@string/keepIntermediateFilesSummary"
+            android:title="@string/keepIntermediateFiles" />
+
     </PreferenceCategory>
 
     <PreferenceCategory