Add support for API 26 and above

app/build.gradle

@@ -15,18 +15,14 @@
  */
 apply plugin: 'com.android.application'
 android {
-    compileSdkVersion 25
-    buildToolsVersion '25.0.1'
+    compileSdkVersion 29
     defaultConfig {
         applicationId 'de.stocard.keepactivitiestile'
         minSdkVersion 24
-        targetSdkVersion 25
+        targetSdkVersion 29
         versionCode 1
         versionName "1.0"
         archivesBaseName = "keep-activities-qs"
-        jackOptions {
-            enabled true
-        }
     }
 
     buildTypes {
@@ -41,5 +37,5 @@ android {
     }
 }
 dependencies {
-    compile 'com.android.support:support-annotations:25.0.1'
+    implementation 'androidx.annotation:annotation:1.1.0'
 }

app/src/main/java/de/stocard/keepactivitiestile/KeepActivitiesToggle.java

@@ -19,16 +19,18 @@
 
 import android.content.ContentResolver;
 import android.content.Context;
+import android.os.Build;
 import android.provider.Settings;
-import android.support.annotation.DrawableRes;
-import android.support.annotation.NonNull;
-import android.support.annotation.StringRes;
 import android.util.Log;
 import android.widget.Toast;
 
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
+import androidx.annotation.DrawableRes;
+import androidx.annotation.NonNull;
+import androidx.annotation.StringRes;
+
 /**
  * A helper class for working with the system setting for "Don't keep activities".
  * <p>
@@ -85,7 +87,7 @@ static boolean setKeepActivities(@NonNull Context context, boolean keepActivitie
         } catch (SecurityException | NoSuchMethodException | IllegalAccessException | InvocationTargetException | ClassNotFoundException e) {
             String message = context.getString(R.string.permission_required_toast);
             Toast.makeText(context.getApplicationContext(), message, Toast.LENGTH_LONG).show();
-            Log.d(TAG, message);
+            Log.e(TAG, message, e);
             return false;
         }
     }
@@ -94,12 +96,21 @@ private static void setKeepActivitiesInActivityManager(
             boolean keepActivities) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
         // Due to restrictions related to hidden APIs, need to emulate the line below
         // using reflection:
-        // ActivityManagerNative.getDefault().setAlwaysFinish(keepActivities);
-        final Class classActivityManagerNative = Class.forName("android.app.ActivityManagerNative");
-        final Method methodGetDefault = classActivityManagerNative.getMethod("getDefault");
-        final Method methodSetAlwaysFinish = classActivityManagerNative.getMethod("setAlwaysFinish", new Class[]{boolean.class});
-        final Object objectInstance = methodGetDefault.invoke(null);
-        methodSetAlwaysFinish.invoke(objectInstance, new Object[]{!keepActivities});
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            // ActivityManagerNative.getDefault().setAlwaysFinish(keepActivities);
+            final Class classActivityManagerNative = Class.forName("android.app.ActivityManagerNative");
+            final Method methodGetDefault = classActivityManagerNative.getMethod("getDefault");
+            final Method methodSetAlwaysFinish = classActivityManagerNative.getMethod("setAlwaysFinish", new Class[]{boolean.class});
+            final Object objectInstance = methodGetDefault.invoke(null);
+            methodSetAlwaysFinish.invoke(objectInstance, new Object[]{!keepActivities});
+        } else {
+            // ActivityManager.getService().setAlwaysFinish(keepActivities);
+            final Class classActivityManager = Class.forName("android.app.ActivityManager");
+            final Method methodGetService = classActivityManager.getMethod("getService");
+            final Object serviceInstance = methodGetService.invoke(null);
+            final Method methodSetAlwaysFinish = serviceInstance.getClass().getMethod("setAlwaysFinish", new Class[]{boolean.class});
+            methodSetAlwaysFinish.invoke(serviceInstance, new Object[]{!keepActivities});
+        }
     }
 
     private static void storeSetting(@NonNull Context context, boolean keepActivities) {

build.gradle

@@ -17,9 +17,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:3.5.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -29,6 +30,7 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }
 

gradle.properties

@@ -9,6 +9,8 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
+android.enableJetifier=true
+android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536m
 
 # When configured, Gradle will run in incubating parallel mode.

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Fri Sep 02 10:49:19 BST 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip