Fixes for child Fragment TaskManagers.

Author: Rolf-Smit

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.0.0'
+        classpath 'com.android.tools.build:gradle:2.1.2'
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.6'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.3'
         // NOTE: Do not place your application dependencies here; they belong

demo/build.gradle

@@ -23,8 +23,8 @@ dependencies {
     compile project(':library')
     //compile 'org.neotech.library:android-retainable-tasks:0.1.0'
 
-    compile 'com.android.support:appcompat-v7:23.3.0'
-    compile 'com.android.support:design:23.3.0'
+    compile 'com.android.support:appcompat-v7:23.4.0'
+    compile 'com.android.support:design:23.4.0'
 
     //LeakCanary is used to detect memory leaks in debug builds.
     debugCompile 'com.squareup.leakcanary:leakcanary-android:1.3.1'

demo/src/main/java/org/neotech/app/retainabletasksdemo/activity/Main.java

@@ -114,7 +114,6 @@ protected ArrayList<Demo> doInBackground() {
         }
     }
 
-
     private static class DemoAdapter extends BaseAdapter implements View.OnClickListener {
 
         private static class ViewHolder {

library/build.gradle

@@ -16,7 +16,7 @@ ext {
     artifact = 'android-retainable-tasks'
 
     libraryDescription = 'Android-Retainable-Tasks is an easy to use mini-library for easy asynchronous background tasking with callback support to the UI. This library is based on the Android AsyncTask implementation but with support for retaining tasks and therefore surviving configuration changes (orientation).'
-    libraryVersion = '0.2.2'
+    libraryVersion = '0.2.3'
 
     siteUrl = 'https://github.com/NeoTech-Software/Android-Retainable-Tasks'
     gitUrl = 'https://github.com/NeoTech-Software/Android-Retainable-Tasks.git'
@@ -60,8 +60,8 @@ configurations {
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:23.3.0'
-    javadocCompile 'com.android.support:appcompat-v7:23.3.0'
+    compile 'com.android.support:appcompat-v7:23.4.0'
+    javadocCompile 'com.android.support:appcompat-v7:23.4.0'
 }
 
 apply from: 'publish-library.gradle'

library/src/main/java/org/neotech/library/retainabletasks/TaskManager.java

@@ -151,7 +151,11 @@ public static boolean isStrictDebugModeEnabled(){
     @MainThread
     public static TaskManager getFragmentTaskManager(@NonNull Fragment fragment){
         final String tag = getTaskManagerTag(fragment.getTag());
-        return getTaskManager(TaskRetainingFragment.getInstance(fragment.getFragmentManager()), tag);
+        if(fragment.getParentFragment() != null){
+            return getTaskManager(TaskRetainingFragment.getInstance(fragment.getParentFragment().getFragmentManager()), tag);
+        } else {
+            return getTaskManager(TaskRetainingFragment.getInstance(fragment.getFragmentManager()), tag);
+        }
     }
 
     /**
@@ -163,9 +167,24 @@ public static TaskManager getFragmentTaskManager(@NonNull Fragment fragment){
     @MainThread
     public static TaskManager getFragmentTaskManager(@NonNull android.app.Fragment fragment){
         final String tag = getTaskManagerTag(fragment.getTag());
-        return getTaskManager(TaskRetainingFragment.getInstance(fragment.getFragmentManager()), tag);
+        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1){
+            return getFragmentTaskManagerAPI17(fragment, tag);
+        } else {
+            return getTaskManager(TaskRetainingFragment.getInstance(fragment.getFragmentManager()), tag);
+        }
     }
 
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
+    @MainThread
+    private static TaskManager getFragmentTaskManagerAPI17(@NonNull android.app.Fragment fragment, String tag){
+        if(fragment.getParentFragment() != null){
+            return getTaskManager(TaskRetainingFragment.getInstance(fragment.getParentFragment().getFragmentManager()), tag);
+        } else {
+            return getTaskManager(TaskRetainingFragment.getInstance(fragment.getFragmentManager()), tag);
+        }
+    }
+
+
     private static TaskManager getTaskManager(@NonNull TaskRetainingFragment taskRetainingFragment, @NonNull String tag){
         BaseTaskManager manager = (BaseTaskManager) taskRetainingFragment.findTaskManagerByTag(tag);
         if(manager == null){