Using SeekBar to Control Volume in android?

Question

How can I accurately change the volume of my app using a seekbar without controlling the volume by the volume buttons on my android device? I have seperate function on the Volume keys on my android that's why I want to use a seekbar to control the volume. Can Anyone please help me?

Answer 1

This is a custom View I've used to adjust the volume level. It works by sliding your finger up, but you could easily change that.

SliderView

public class SliderView extends View implements OnGestureListener, OnTouchListener {

private int mHeight = 0;

private int mMaxValue = 16;
private float mDelta = 0;
private int mColor = Color.WHITE;
private GestureDetector mGestureDetector;

private OnValueChangeListener mListener;

public SliderView(Context context) {
    super(context);
    init(context);
}

public SliderView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init(context);
}

public SliderView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init(context);
}

@Override
public boolean onDown(MotionEvent e) {
    mDelta = 0;
    return false;
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    return false;
}

@Override
public void onLongPress(MotionEvent e) {
    mDelta = 0;
}

@Override
public boolean onScroll(MotionEvent event1, MotionEvent event2, float distanceX, float distanceY) {

    if (mDelta >= 1 || mDelta <= -1) {
        if (mListener != null) {
            mListener.onValueChanged((int) mDelta);
        }
        mDelta = 0;
    } else {
        mDelta += mMaxValue * distanceY / mHeight * 2;
    }
    return false;
}

@Override
public void onShowPress(MotionEvent e) {

}

@Override
public boolean onSingleTapUp(MotionEvent e) {
    return false;
}

@Override
public void onSizeChanged(int w, int h, int oldw, int oldh) {
    mHeight = getHeight();
}

@Override
public boolean onTouch(View v, MotionEvent event) {

    int action = event.getAction();
    if (action == MotionEvent.ACTION_DOWN) {
        v.setBackgroundColor(Color.argb(0x33, Color.red(mColor), Color.green(mColor),
                Color.blue(mColor)));
    } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
        v.setBackgroundColor(Color.TRANSPARENT);
    }
    mGestureDetector.onTouchEvent(event);
    return true;
}

public void setColor(int color) {
    mColor = color;
}

public void setMax(int max) {
    mMaxValue = max;
}

public void setOnValueChangeListener(OnValueChangeListener listener) {
    mListener = listener;
}

private void init(Context context) {
    setOnTouchListener(this);
    mGestureDetector = new GestureDetector(context, this);
    mHeight = getHeight();
}

public interface OnValueChangeListener {

    void onValueChanged(int value);
    }

}

Using it - make sure you implement OnValueChangeListener.

SliderView mSlider;
mSlider= (SliderView) findViewById(id);
mSlider.setOnValueChangeListener(this);
mSlider.setMax(mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));

It's not exactly what you're asking for, but it should definitely help you out, I think.

Answer 2

Please look at below code . It solves your problem.

import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class TestExample extends Activity 
{
    /** Called when the activity is first created. */

    private SeekBar volumeSeekbar = null;
    private AudioManager audioManager = null; 

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setVolumeControlStream(AudioManager.STREAM_MUSIC);
        setContentView(R.layout.main);
        initControls();
    }

    private void initControls()
    {
        try
        {
            volumeSeekbar = (SeekBar)findViewById(R.id.seekBar1);
            audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
            volumeSeekbar.setMax(audioManager
                    .getStreamMaxVolume(AudioManager.STREAM_MUSIC));
            volumeSeekbar.setProgress(audioManager
                    .getStreamVolume(AudioManager.STREAM_MUSIC));   


            volumeSeekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() 
            {
                @Override
                public void onStopTrackingTouch(SeekBar arg0) 
                {
                }

                @Override
                public void onStartTrackingTouch(SeekBar arg0) 
                {
                }

                @Override
                public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) 
                {
                    audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,
                            progress, 0);
                }
            });
        }
        catch (Exception e) 
        {
            e.printStackTrace();
        }
    }

Answer 3

@CommonsWare do it like this in https://github.com/commonsguy/cw-omnibus/tree/master/SystemServices/Volume and also set five types of volume using SeekBar

Handling five different types of Volume

/***
  Copyright (c) 2008-2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    http://commonsware.com/Android
*/

package com.commonsware.android.syssvc.volume;

import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.os.Bundle;
import android.widget.SeekBar;

public class Volumizer extends Activity {
  SeekBar alarm=null;
  SeekBar music=null;
  SeekBar ring=null;
  SeekBar system=null;
  SeekBar voice=null;
  AudioManager mgr=null;

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

    mgr=(AudioManager)getSystemService(Context.AUDIO_SERVICE);

    alarm=(SeekBar)findViewById(R.id.alarm);
    music=(SeekBar)findViewById(R.id.music);
    ring=(SeekBar)findViewById(R.id.ring);
    system=(SeekBar)findViewById(R.id.system);
    voice=(SeekBar)findViewById(R.id.voice);

    initBar(alarm, AudioManager.STREAM_ALARM);
    initBar(music, AudioManager.STREAM_MUSIC);//for Volume this is neccessary
    initBar(ring, AudioManager.STREAM_RING);
    initBar(system, AudioManager.STREAM_SYSTEM);
    initBar(voice, AudioManager.STREAM_VOICE_CALL);
  }

  private void initBar(SeekBar bar, final int stream) {
    bar.setMax(mgr.getStreamMaxVolume(stream));
    bar.setProgress(mgr.getStreamVolume(stream));

    bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
      public void onProgressChanged(SeekBar bar, int progress,
                                    boolean fromUser) {
        mgr.setStreamVolume(stream, progress,
                            AudioManager.FLAG_PLAY_SOUND);
      }

      public void onStartTrackingTouch(SeekBar bar) {
        // no-op
      }

      public void onStopTrackingTouch(SeekBar bar) {
        // no-op
      }
    });
  }
}

And for controlling only Volume use only
music=(SeekBar)findViewById(R.id.music); and initBar(music, AudioManager.STREAM_MUSIC);