- folder name option added for DiskLogAdapter.

build.gradle

@@ -1,11 +1,11 @@
 buildscript {
-  ext.kotlinVersion = '1.2.31'
+  ext.kotlinVersion = '1.2.51'
   repositories {
     google()
     jcenter()
   }
   dependencies {
-    classpath 'com.android.tools.build:gradle:3.1.0'
+    classpath 'com.android.tools.build:gradle:3.2.1'
     classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
   }
 }

logger/build.gradle

@@ -3,7 +3,7 @@ apply plugin: 'kotlin-android'
 
 android {
   compileSdkVersion rootProject.ext.compileSdkVersion
-  buildToolsVersion rootProject.ext.buildToolsVersion
+  buildToolsVersion '28.0.3'
 
   defaultConfig {
     minSdkVersion rootProject.ext.minSdkVersion

logger/src/main/java/com/orhanobut/logger/CsvFormatStrategy.java

@@ -7,6 +7,7 @@
 import android.support.annotation.Nullable;
 
 import java.io.File;
+import java.nio.file.InvalidPathException;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.Locale;
@@ -38,6 +39,10 @@ private CsvFormatStrategy(@NonNull Builder builder) {
     tag = builder.tag;
   }
 
+  @NonNull public static Builder newBuilder(String foldername, int maxsize) {
+    return new Builder(foldername, maxsize);
+  }
+
   @NonNull public static Builder newBuilder() {
     return new Builder();
   }
@@ -88,14 +93,31 @@ private CsvFormatStrategy(@NonNull Builder builder) {
   }
 
   public static final class Builder {
-    private static final int MAX_BYTES = 500 * 1024; // 500K averages to a 4000 lines per file
+    private static int MAX_BYTES = 500 * 1024; // default size 500K averages to a 4000 lines per file
 
     Date date;
     SimpleDateFormat dateFormat;
     LogStrategy logStrategy;
     String tag = "PRETTY_LOGGER";
+    String folderName = "logger"; //default folder name
+
+    // Default constructor, will use logger as folder name and 500K as default size
+    private Builder(){
+
+    }
 
-    private Builder() {
+    private Builder(String foldername, int maxsize) {
+        if (foldername == null || foldername.length() == 0) {
+          //folder name seems to be invalid, throw an exception (just basic check, there could be invalid characters for folder name those will throw exception at time of writing
+          throw new IllegalArgumentException("Folder name you have provided seems to be invalid. " + foldername);
+        }
+        if(maxsize <= 0)
+        {
+          throw new IllegalArgumentException("File max size must be greater than 0, you have provided " + maxsize);
+        }
+
+        folderName = foldername;
+        MAX_BYTES = maxsize;
     }
 
     @NonNull public Builder date(@Nullable Date val) {
@@ -127,7 +149,7 @@ private Builder() {
       }
       if (logStrategy == null) {
         String diskPath = Environment.getExternalStorageDirectory().getAbsolutePath();
-        String folder = diskPath + File.separatorChar + "logger";
+        String folder = diskPath + File.separatorChar + folderName;
 
         HandlerThread ht = new HandlerThread("AndroidFileLogger." + folder);
         ht.start();

logger/src/main/java/com/orhanobut/logger/DiskLogAdapter.java

@@ -13,10 +13,16 @@ public class DiskLogAdapter implements LogAdapter {
 
   @NonNull private final FormatStrategy formatStrategy;
 
+
   public DiskLogAdapter() {
     formatStrategy = CsvFormatStrategy.newBuilder().build();
   }
 
+  public DiskLogAdapter(String foldername, int maxfilesize)
+  {
+    formatStrategy = CsvFormatStrategy.newBuilder(foldername, maxfilesize).build();
+  }
+
   public DiskLogAdapter(@NonNull FormatStrategy formatStrategy) {
     this.formatStrategy = checkNotNull(formatStrategy);
   }

sample/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
   compileSdkVersion rootProject.ext.compileSdkVersion
-  buildToolsVersion rootProject.ext.buildToolsVersion
+  buildToolsVersion '28.0.3'
 
   defaultConfig {
     applicationId "com.orhanobut.sample"

sample/src/main/AndroidManifest.xml

@@ -2,6 +2,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.orhanobut.sample">
 
+  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
   <application
     android:icon="@mipmap/ic_launcher"
     android:label="Sample">

sample/src/main/java/com/orhanobut/sample/MainActivity.java

@@ -82,5 +82,10 @@ protected void onCreate(Bundle savedInstanceState) {
     Logger.addLogAdapter(new AndroidLogAdapter(formatStrategy));
 
     Logger.w("my log message with my tag");
+
+    Logger.clearLogAdapters();
+    Logger.addLogAdapter(new DiskLogAdapter("customfoldername", 2097152)); //create a DiskLogAdapter with folder name customfoldername and 2MB max file size
+
+    Logger.i("Info log written in custom folder");
   }
 }