Make some constants private and annotate params

Author: TobiGr

app/src/main/java/org/schabi/newpipe/settings/SettingMigrations.java

@@ -4,6 +4,7 @@
 import android.content.SharedPreferences;
 import android.util.Log;
 
+import androidx.annotation.NonNull;
 import androidx.preference.PreferenceManager;
 
 import org.schabi.newpipe.R;
@@ -30,9 +31,9 @@ public final class SettingMigrations {
     private static final String TAG = SettingMigrations.class.toString();
     private static SharedPreferences sp;
 
-    public static final Migration MIGRATION_0_1 = new Migration(0, 1) {
+    private static final Migration MIGRATION_0_1 = new Migration(0, 1) {
         @Override
-        public void migrate(final Context context) {
+        public void migrate(@NonNull final Context context) {
             // We changed the content of the dialog which opens when sharing a link to NewPipe
             // by removing the "open detail page" option.
             // Therefore, show the dialog once again to ensure users need to choose again and are
@@ -44,9 +45,9 @@ public void migrate(final Context context) {
         }
     };
 
-    public static final Migration MIGRATION_1_2 = new Migration(1, 2) {
+    private static final Migration MIGRATION_1_2 = new Migration(1, 2) {
         @Override
-        protected void migrate(final Context context) {
+        protected void migrate(@NonNull final Context context) {
             // The new application workflow introduced in #2907 allows minimizing videos
             // while playing to do other stuff within the app.
             // For an even better workflow, we minimize a stream when switching the app to play in
@@ -63,9 +64,9 @@ protected void migrate(final Context context) {
         }
     };
 
-    public static final Migration MIGRATION_2_3 = new Migration(2, 3) {
+    private static final Migration MIGRATION_2_3 = new Migration(2, 3) {
         @Override
-        protected void migrate(final Context context) {
+        protected void migrate(@NonNull final Context context) {
             // Storage Access Framework implementation was improved in #5415, allowing the modern
             // and standard way to access folders and files to be used consistently everywhere.
             // We reset the setting to its default value, i.e. "use SAF", since now there are no
@@ -79,9 +80,9 @@ protected void migrate(final Context context) {
         }
     };
 
-    public static final Migration MIGRATION_3_4 = new Migration(3, 4) {
+    private static final Migration MIGRATION_3_4 = new Migration(3, 4) {
         @Override
-        protected void migrate(final Context context) {
+        protected void migrate(@NonNull final Context context) {
             // Pull request #3546 added support for choosing the type of search suggestions to
             // show, replacing the on-off switch used before, so migrate the previous user choice
 
@@ -108,9 +109,9 @@ protected void migrate(final Context context) {
         }
     };
 
-    public static final Migration MIGRATION_4_5 = new Migration(4, 5) {
+    private static final Migration MIGRATION_4_5 = new Migration(4, 5) {
         @Override
-        protected void migrate(final Context context) {
+        protected void migrate(@NonNull final Context context) {
             final boolean brightness = sp.getBoolean("brightness_gesture_control", true);
             final boolean volume = sp.getBoolean("volume_gesture_control", true);
 
@@ -144,10 +145,10 @@ protected void migrate(final Context context) {
     /**
      * Version number for preferences. Must be incremented every time a migration is necessary.
      */
-    public static final int VERSION = 5;
+    private static final int VERSION = 5;
 
 
-    public static void initMigrations(final Context context, final boolean isFirstRun) {
+    public static void initMigrations(@NonNull final Context context, final boolean isFirstRun) {
         // setup migrations and check if there is something to do
         sp = PreferenceManager.getDefaultSharedPreferences(context);
         final String lastPrefVersionKey = context.getString(R.string.last_used_preferences_version);
@@ -212,7 +213,7 @@ private boolean shouldMigrate(final int currentVersion) {
             return oldVersion >= currentVersion;
         }
 
-        protected abstract void migrate(Context context);
+        protected abstract void migrate(@NonNull Context context);
 
     }