Value for 'work cycles' is remembered between app runs. Close #74

Author: dturner

SimpleSynth/app/src/main/java/com/example/simplesynth/MainActivity.java

@@ -19,6 +19,7 @@
 
 import android.annotation.TargetApi;
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
 import android.media.AudioManager;
@@ -44,7 +45,9 @@ public class MainActivity extends AppCompatActivity {
  private static final int VARIABLE_LOAD_LOW_DURATION = 2000;
  private static final int VARIABLE_LOAD_HIGH_DURATION = 2000;
  public static final int MAXIMUM_WORK_CYCLES = 500000;
- private static final int WORK_CYCLE_STEPS = 100;
+ private static final int SEEKBAR_STEPS = 100;
+ private static final float WORK_CYCLES_PER_STEP = MAXIMUM_WORK_CYCLES / SEEKBAR_STEPS;
+ private static final String PREFERENCES_KEY_WORK_CYCLES = "work_cycles";
 
  private static int workCycles = 0;
 
@@ -55,6 +58,7 @@ public class MainActivity extends AppCompatActivity {
  private TextView mDeviceInfoText, mWorkCyclesText;
  private AudioTrack mAudioTrack;
  private VariableLoadGenerator mLoadThread;
+ private SharedPreferences mSettings;
 
  // Native methods
  private static native void native_createEngine(int apiLevel);
@@ -77,6 +81,10 @@ protected void onCreate(Bundle savedInstanceState) {
  // Lock to portrait to avoid onCreate being called more than once
  setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
 
+ // Load any previously saved values
+ mSettings = getPreferences(MODE_PRIVATE);
+ workCycles = mSettings.getInt(PREFERENCES_KEY_WORK_CYCLES, workCycles);
+
  initDeviceInfoUI();
  initPerformanceConfigurationUI();
 
@@ -88,6 +96,16 @@ protected void onCreate(Bundle savedInstanceState) {
 
  // Update the UI when there are underruns
  initUnderrunUpdater();
+
+ setWorkCycles(workCycles);
+ }
+
+ @Override
+ protected void onStop(){
+ super.onStop();
+ SharedPreferences.Editor editor = mSettings.edit();
+ editor.putInt(PREFERENCES_KEY_WORK_CYCLES, workCycles);
+ editor.apply();
  }
 
  private void initDeviceInfoUI(){
@@ -210,10 +228,12 @@ public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
  mWorkCyclesText = (TextView) findViewById(R.id.workCyclesText);
 
  SeekBar workCyclesSeekBar = (SeekBar) findViewById(R.id.workCycles);
+ workCyclesSeekBar.setProgress((int)(workCycles / WORK_CYCLES_PER_STEP));
+
  workCyclesSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
  @Override
  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
- workCycles = progress * (MAXIMUM_WORK_CYCLES / WORK_CYCLE_STEPS);
+ workCycles = (int)(progress * WORK_CYCLES_PER_STEP);
  setWorkCycles(workCycles);
  }