Remember adjustment step size for playback controls (speed and pitch)

- Add adjustment_step_key to settings_keys.xml to be used when
saving/loading the step size.
- Remove the global stepSize variable and the code that saves it to
outState/loads it from savedInstanceState because it's now saved to
Shared Preferences.
- Move initially setting step size to setupStepSizeSelector to be
consistent with the other view setup methods, using the value loaded
from Shared Preferences.
- Save the step size to Shared Preferences inside setStepSize.

Fixes: #7031

app/src/main/java/org/schabi/newpipe/player/helper/PlaybackParameterDialog.java

@@ -71,7 +71,6 @@ public class PlaybackParameterDialog extends DialogFragment {
     private double tempo = DEFAULT_TEMPO;
     private double pitch = DEFAULT_PITCH;
     private int semitones = DEFAULT_SEMITONES;
-    private double stepSize = DEFAULT_STEP;
 
     @Nullable
     private SeekBar tempoSlider;
@@ -147,7 +146,6 @@ public class PlaybackParameterDialog extends DialogFragment {
             tempo = savedInstanceState.getDouble(TEMPO_KEY, DEFAULT_TEMPO);
             pitch = savedInstanceState.getDouble(PITCH_KEY, DEFAULT_PITCH);
             semitones = percentToSemitones(pitch);
-            stepSize = savedInstanceState.getDouble(STEP_SIZE_KEY, DEFAULT_STEP);
         }
     }
 
@@ -159,7 +157,6 @@ public class PlaybackParameterDialog extends DialogFragment {
 
         outState.putDouble(TEMPO_KEY, getCurrentTempo());
         outState.putDouble(PITCH_KEY, getCurrentPitch());
-        outState.putDouble(STEP_SIZE_KEY, getCurrentStepSize());
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -203,7 +200,7 @@ public class PlaybackParameterDialog extends DialogFragment {
 
         togglePitchSliderType(rootView);
 
-        setStepSize(stepSize);
+        setupStepSizeSelector(rootView);
     }
 
     private void togglePitchSliderType(@NonNull final View rootView) {
@@ -380,6 +377,10 @@ public class PlaybackParameterDialog extends DialogFragment {
     }
 
     private void setupStepSizeSelector(@NonNull final View rootView) {
+        setStepSize(PreferenceManager
+                .getDefaultSharedPreferences(requireContext())
+                .getFloat(getString(R.string.adjustment_step_key), (float) DEFAULT_STEP));
+
         final TextView stepSizeOnePercentText = rootView.findViewById(R.id.stepSizeOnePercent);
         final TextView stepSizeFivePercentText = rootView.findViewById(R.id.stepSizeFivePercent);
         final TextView stepSizeTenPercentText = rootView.findViewById(R.id.stepSizeTenPercent);
@@ -438,7 +439,10 @@ public class PlaybackParameterDialog extends DialogFragment {
     }
 
     private void setStepSize(final double stepSize) {
-        this.stepSize = stepSize;
+        PreferenceManager.getDefaultSharedPreferences(requireContext())
+                .edit()
+                .putFloat(getString(R.string.adjustment_step_key), (float) stepSize)
+                .apply();
 
         if (tempoStepUpText != null) {
             tempoStepUpText.setText(getStepUpPercentString(stepSize));
@@ -665,10 +669,6 @@ public class PlaybackParameterDialog extends DialogFragment {
         return semitoneSlider == null ? semitones : semitoneSlider.getProgress() - 12;
     }
 
-    private double getCurrentStepSize() {
-        return stepSize;
-    }
-
     private boolean getCurrentSkipSilence() {
         return skipSilenceCheckbox != null && skipSilenceCheckbox.isChecked();
     }

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

@@ -258,6 +258,7 @@
     <string name="main_page_content_key">main_page_content</string>
     <string name="enable_playback_resume_key">enable_playback_resume</string>
     <string name="enable_playback_state_lists_key">enable_playback_state_lists</string>
+    <string name="adjustment_step_key">adjustment_step_key</string>
     <string name="playback_unhook_key">playback_unhook_key</string>
     <string name="playback_speed_key">playback_speed_key</string>
     <string name="playback_pitch_key">playback_pitch_key</string>