Android Audio Manager New Tutorial

in  post, I will be discussing about using , AudioManager Class in Android applications.

with AudioManager Class provides access to volume and ringer mode control which was added in API level
I wrote separate post about using AudioManager in getting and setting the current device’s volume (Media player, , Notification etc) long back.

But in this post, I am going to discuss about using AudioManager in getting and setting the ringer mode (Silent, Vibrate and Normal).
What is Seekbar?
A SeekBar is an extension of ProgressBar that adds a draggable thumb. The user can touch the thumb and drag left or right to set the current progress level or use the arrow keys.
Usage: Seekbar can be used to adjust media player volume, set brightness of the screen, seek a playing music etc.
What are we going to develop?
We will develop a simple application to demonstrate how it is used to set Media player, Ringer, Alarm and Notification volume for your device.

Quick Links.

• Project Structure
• Code Listings
• Demo
• Download Source Code

Project .Structure

Layout creation:

• Create new android project [File >> New >> Android Project] with project name SeekBarExample
• Click next and select target android device version [I chose version 2.2]
• Click next and enter package name – ‘com.prgguru.android’
• Click finish

Code Listings

Layout XML:
Open main.xml present under /res/layout folder and replace the XML with the below one.

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical" >     <TextView         android:id="@+id/textView1"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="Adjust Media player volume"         android:textAppearance="?android:attr/textAppearanceLarge" android:padding="10px"/>     <SeekBar         android:id="@+id/seekBar1"         android:layout_width="match_parent"         android:layout_height="wrap_content" />     <TextView         android:id="@+id/textView2"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="Adjust Ringer volume"         android:textAppearance="?android:attr/textAppearanceLarge" android:padding="10px" />     <SeekBar         android:id="@+id/seekBar2"         android:layout_width="match_parent"         android:layout_height="wrap_content" />        <TextView         android:id="@+id/textView2"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="Adjust Alarm volume"         android:textAppearance="?android:attr/textAppearanceLarge" android:padding="10px"/>     <SeekBar         android:id="@+id/seekBar3"         android:layout_width="match_parent"         android:layout_height="wrap_content" />     <TextView         android:id="@+id/textView2"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="Adjust Notification volume"         android:textAppearance="?android:attr/textAppearanceLarge" android:padding="10px"/>     <SeekBar         android:id="@+id/seekBar4"         android:layout_width="match_parent"         android:layout_height="wrap_content" /> </LinearLayout>

Application layout will look like:
Change to graphical layout of Main.xml, the layout design should look like below:

Create following objects under SeekBarExampleActivity class to refer seekbars and to get audimanager:

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private SeekBar mediaVlmSeekBar = null; private SeekBar ringerVlmSeekBar = null; private SeekBar alarmVlmSeekBar = null; private SeekBar notifyVlmSeekBar = null; private AudioManager audioManager = null;

Suggests an audio stream whose volume should be changed by the hardware volume controls. Add following snippet inside onCreate method after ‘super.onCreate(savedInstanceState)’

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this.setVolumeControlStream(AudioManager.STREAM_MUSIC);        this.setVolumeControlStream(AudioManager.STREAM_RING);    this.setVolumeControlStream(AudioManager.STREAM_ALARM); this.setVolumeControlStream(AudioManager.STREAM_NOTIFICATION);

A separate method ‘initControls’ to handle the seekbars is going to be created, call it inside onCreate method:

1	initControls();

private void initControls() { //Return the handle to a system-level service - 'AUDIO'. audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); //Find the seekbar 1 mediaVlmSeekBar = (SeekBar) findViewById(R.id.seekBar1); //Set the max range(Volume in this case) of seekbar //for Media player volume mediaVlmSeekBar.setMax(audioManager         .getStreamMaxVolume(AudioManager.STREAM_MUSIC)); //Set the progress with current Media Volume mediaVlmSeekBar.setProgress(audioManager         .getStreamVolume(AudioManager.STREAM_MUSIC)); //Find the seekbar 2 ringerVlmSeekBar = (SeekBar) findViewById(R.id.seekBar2); //Set the max range(Volume in this case) of seekbar //for Phone ringer volume ringerVlmSeekBar.setMax(audioManager         .getStreamMaxVolume(AudioManager.STREAM_RING)); //Set the progress with current Ringer Volume ringerVlmSeekBar.setProgress(audioManager         .getStreamVolume(AudioManager.STREAM_RING)); //Find the seekbar 3 alarmVlmSeekBar = (SeekBar) findViewById(R.id.seekBar3); //Set the max range(Volume in this case) of seekbar //for Alarm volume alarmVlmSeekBar.setMax(audioManager         .getStreamMaxVolume(AudioManager.STREAM_ALARM)); //Set the progress with current Alarm Volume alarmVlmSeekBar.setProgress(audioManager         .getStreamVolume(AudioManager.STREAM_ALARM)); //Find the seekbar 4 notifyVlmSeekBar = (SeekBar) findViewById(R.id.seekBar4); //Set the max range(Volume in this case) of seekbar //for Notification volume notifyVlmSeekBar.setMax(audioManager         .getStreamMaxVolume(AudioManager.STREAM_NOTIFICATION)); //Set the progress with current Notification Volume notifyVlmSeekBar.setProgress(audioManager         .getStreamVolume(AudioManager.STREAM_NOTIFICATION)); try {     //Listener to receive changes to the SeekBar1's progress level     mediaVlmSeekBar         .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {     public void onStopTrackingTouch(SeekBar arg0) {         }     public void onStartTrackingTouch(SeekBar arg0) {         }     //When progress level of seekbar1 is changed     public void onProgressChanged(SeekBar arg0,         int progress, boolean arg2) {     audioManager.setStreamVolume(         AudioManager.STREAM_MUSIC, progress, 0);     }  });    //Listener to receive changes to the SeekBar2's progress level    ringerVlmSeekBar          .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {    public void onStopTrackingTouch(SeekBar arg0) {         }    public void onStartTrackingTouch(SeekBar arg0) {         }    //When progress level of seekbar2 is changed    public void onProgressChanged(SeekBar arg0,         int progress, boolean arg2) {     audioManager.setStreamVolume(         AudioManager.STREAM_RING, progress, 0);      }  });    //Listener to receive changes to the SeekBar3's progress level    alarmVlmSeekBar         .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {    public void onStopTrackingTouch(SeekBar arg0) {         }    public void onStartTrackingTouch(SeekBar arg0) {         }    //When progress level of seekbar3 is changed    public void onProgressChanged(SeekBar arg0,         int progress, boolean arg2) {      audioManager.setStreamVolume(             AudioManager.STREAM_ALARM, progress, 0);     }  });    //Listener to receive changes to the SeekBar4's progress level    notifyVlmSeekBar         .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {    public void onStopTrackingTouch(SeekBar arg0) {         }    public void onStartTrackingTouch(SeekBar arg0) {         }    //When progress level of seekbar4 is changed    public void onProgressChanged(SeekBar arg0,             int progress, boolean arg2) {      audioManager.setStreamVolume(         AudioManager.STREAM_NOTIFICATION, progress,0);     }  }); } catch (Exception e) {     e.printStackTrace(); } }

Demo

Let us test the application:
Run click on the project >> Run as >> Android application
You could see following screen: