Question

i am new in android development, and i’m trying to figure out how cand i make a button to save changes in a Activity. Brief: i have a seekBar where i can change the ringer volume, but it changes directley for System, i put a Button to Save the changes, and i don’t know how to do this. This is my code:

main.xml

 <Button
        android:id="@+id/save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_text"/>

    <SeekBar
        android:id="@+id/seekVolume"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

Activity

public class SaveActivity extends Activity {

    private AudioManager aManager;
    private SeekBar seekVolume;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        aManager = (AudioManager) getSystemService(AUDIO_SERVICE);
        Button save = (Button) findViewById(R.id.save);

        setOnClickListener();      
}
    private void setOnClickListener(){
        SeekBar seekVolume = (SeekBar) findViewById(R.id.seekVolume);

        seekVolume.setMax(aManager.getStreamMaxVolume(AudioManager.STREAM_RING));
        seekVolume.setKeyProgressIncrement(1);
        seekVolume.setProgress(aManager.getStreamVolume(AudioManager.STREAM_RING));
        seekVolume.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
            public void onStopTrackingTouch(SeekBar ringvolume) {
            }
            public void onStartTrackingTouch(SeekBar ringvolume) {
            }
            public void onProgressChanged(SeekBar ringvolume, int progress,boolean fromUser) {
aManager.setStreamVolume(AudioManager.STREAM_RING, progress, AudioManager.FLAG_SHOW_UI + AudioManager.FLAG_PLAY_SOUND); 
            }
        });
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event){
        if(keyCode==KeyEvent.KEYCODE_VOLUME_DOWN || keyCode==KeyEvent.KEYCODE_VOLUME_UP){
            seekVolume.setProgress(aManager.getStreamVolume(AudioManager.STREAM_RING));
    }
        return (super.onKeyDown(keyCode, event));
    }

}

I really don’t know how to do this. Thanks Guys!

Answer 1

To read your preferences (in onCreate()):

SharedPreferences preferences = getPreferences(MODE_PRIVATE);
seekVolume.setProgress(preferences.getInt("storedVol", 0));

To save your preferences (in onDestroy()):

SharedPreferences preferences = getPreference(MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("storedVol", seekVolume.getProgress()); // value to store
editor.commit();

You retrieve Button save in onCreate() but do nothing with it. What do you want it to do? How about connecting its onClickListener by adding

  save.setOnClickListener(mySaveHandler);

to onCreate()? Then:

View.OnClickListener mySaveHandler = new View.OnClickListener() {
  public void onClick(View v) {
   // Save preferences here instead/aswell
 }
}