Adjusting Volume in Android Audiomanager is inaccurate - java

in my Android Application i have a method, which allows me to adjust the volume. This works like it should.
public void adjustVolume(int adjustType){
if(myAudioManager == null) {
myAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
}
if (adjustType == 0){
myAudioManager.setRingerMode(AudioManager.RINGER_MODE_SILENT);
Toast.makeText(getApplicationContext(), "mute audio", Toast.LENGTH_SHORT).show();
}
else if(adjustType == 1) {
myAudioManager.adjustVolume(AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
Toast.makeText(getApplicationContext(), "decrease volume", Toast.LENGTH_SHORT).show();
}
else if (adjustType == 2){
myAudioManager.adjustVolume(AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
Toast.makeText(getApplicationContext(), "increase volume", Toast.LENGTH_SHORT).show();
}
else if (adjustType == 3){
int maxVolume = myAudioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM);
myAudioManager.setStreamVolume(AudioManager.STREAM_SYSTEM, maxVolume, AudioManager.FLAG_SHOW_UI);
Toast.makeText(getApplicationContext(), "Max volume", Toast.LENGTH_SHORT).show();
}
Log.d(LOG_TAG, "Volume is " + myAudioManager.getStreamVolume(AudioManager.STREAM_SYSTEM));
}
e.g. I can call adjustVolume(1) to decrease the volume, and adjustVolume(2) to increase the volume. From Volume zero, to max volume it takes 15 steps
So far, so good.
Now I have another method, where I want to set the volume directly:
public void adjustVolumeDirect(int volumeValue) {
if(myAudioManager == null) {
myAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
}
//maxVolume is 7
int maxVolume = myAudioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM);
float factor = (float)volumeValue / 100;
int targetVolume = (int) (maxVolume * factor);
Log.d(LOG_TAG,"MAX_VOLUME = "+maxVolume+" VOLUMEVALUE = " +volumeValue+ " TARGET VOLUME = " + targetVolume + "factor = " + factor);
myAudioManager.setStreamVolume(AudioManager.STREAM_SYSTEM,targetVolume , AudioManager.FLAG_SHOW_UI);
}
e.g.
adjustVolumeDirect(100) should set the Volume to max. adjustVolumeDirect(50) should set in to 50% and so on.
And this part does not work like I expect it. I can only set the volume in 7 steps! The method above gives me 15 steps!
Can anyone give me a hint how to solve this?
I want to set the volume in 10-steps:
adjustVolumeDirect(10) = 10%
adjustVolumeDirect(20) = 20%
...
adjustVolumeDirect(100) = 100%
How can I achieve this?


The reason you have a different number of steps is probably because two different audio streams are affected - for example the system audio stream, which may have 7 steps and the media audio stream, which might have 15.
The number of steps are different for various android devices and are defined in the system. See also this issue in the android bug tracker.
There are different ways to allow a finer tuning depending on your device. You can probably find some more information here on the android stackexchange site.


I've resolved the issue with this:
mAudioManager.getStreamMaxVolume(audio.STREAM_MUSIC)**/3**
mAudioManager.getStreamMaxVolume(audio.STREAM_MUSIC)**/2**
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, audio.getStreamMaxVolume(mAudioManager.STREAM_MUSIC)/3, AudioManager.FLAG_SHOW_UI);

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Parrot AR.Drone 2.0 - JavaDrone (Get the drone details E.G. Battery Level, Altitude, Speed etc)?

I am working on Parrot AR. Drone project. The libraries are downloaded and implemented in this project from JavaDrone website (https://code.google.com/p/javadrone/downloads/list). However, although I did included the all the correct libraries and make the right class call to get the method, it still cannot return me the correct information. All the results returned appeared to be "false". Any idea what happening on this code? Please help me :(
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private void jButtonConnectActionPerformed(java.awt.event.ActionEvent evt) {
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******************************************
Drone Infomation
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Drone Flying ? false
Control Received ? false
Motor Down ? false
Not Enough Power ?false
Trim Received ? false
Trim Running? false
Trim succeded? false
PIC Number OK? false
********************************************
Update:
What I did was followed John's suggestion. I did implemented all the neccessary methods and NavDataListener for getting the NavData from drone.
import com.codeminders.ardrone.ARDrone;
import com.codeminders.ardrone.ARDrone.VideoChannel;
import com.codeminders.ardrone.NavData;
import com.codeminders.ardrone.NavDataListener;
public class arDrone extends javax.swing.JFrame implements Runnable, NavDataListener{
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public NavData data = new NavData();
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batteryStatus.setForeground(Color.RED);
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batteryStatus.setForeground(Color.ORANGE);
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batteryStatus.setForeground(Color.GREEN);
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The problem is that you are not doing anything to actually get navdata. You can't just create a NavData object and hope it gets filled in with valid data--It won't.
You need to use the com.codeminders.ardrone.NavDataListener interface.
Implement the NavDataListener interface, and the
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Add your listener using the ARDrone
method addNavDataListener.
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you will receive a NavData object with valid telemetry data.

Do you set the Drone IP address? According to sources the default IP for the drone is 192.168.1.1.
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Android : How to set MediaPlayer volume programmatically?

How to set the mediaplayer volume programmatically. I use it for alarm notification. Any help is highly appreciated and thanks in advance.

Using AudioManager, you can simply control the volume of media players.
AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
also from MediaPlayer (But I didn't try that)
setVolume(float leftVolume, float rightVolume)
Since: API Level 1
Sets the volume on this player. This API is recommended for balancing
the output of audio streams within an application. Unless you are
writing an application to control user settings, this API should be
used in preference to setStreamVolume(int, int, int) which sets the
volume of ALL streams of a particular type. Note that the passed
volume values are raw scalars. UI controls should be scaled
logarithmically.
Parameters
leftVolume left volume scalar
rightVolume right volume scalar

Hope this help
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
For Volume UP
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
for Volume Down
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);

You do have the setVolume method in the MediaPlayer class. See here

To Hide Volume Controll UI:
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
For Volume UP
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE, 0);
for Volume Down
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER, 0);

Read this page right here. It explains very well.
Basically, unless your app is a replacement alarm clock, you need to make the following call in the "onCreate()" function:
setVolumeControlStream(AudioManager.STREAM_MUSIC);
In this way you can create the volume of your app using the hardware buttons.

You can do the below using Kotlin, this code will check if the media volume is more than 20% of the maximum volume of the device, and will reduce it to be 20% only.
val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager
val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)
val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)
val percent = 0.2f
val twintyVolume = (maxVolume * percent).toInt()
if ( level > twintyVolume) {
Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()
audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)
}

Remember to set left and right speaker volumes.
if (System.nanoTime() == alarm){
yourMediaPlayer.setVolume(volume, volume)}
}

Try This
protected static void setVolume(int volume) {
currentVolume = volume;
{
if (volume == 1) {
volume = 2;
}
try {
float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);
mediaPlayer.setVolume(vol, vol);
} catch (Exception e) {
e.printStackTrace();
}
}
}

The below code sets the volume to the maximum level (getStreamMaxVolume()).
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

Code:
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
try
{
float count = 100 * 0.2f;
Log.d("--count_float", count + "");
Log.d("--count_final", Math.round(count) + "");
Log.d("--count_volume", new
PreferenceMotionSensor(mContext).getStreamVolume());
mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);
}
catch (Exception e)
{
Log.d("--Error", e.getMessage());
}
Output
D/--count_float: 20.0
D/--count_final: 20
D/--count_volume: 100

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