You just purchased no name true wireless earbuds and their sound isn’t good. If you want to play around a bit with the sound – you can download EQ app on Android or create a EQ app yourself.
- Creating Android App requires basic knowledge about Java and Android studio.
- Google is in favor of Kotlin over Java for Android app
- As attaching an Equalizer or BassBoost to the global audio output mix by use of session 0 is deprecated. That means you have to attach the affect on specific tracks – it’s more complicated if your phone plays music on Spotify, Apple Music – it’s impossible to get the ID sessions from those apps.
- Sound effect just increases the ohm of certain ranges – it doesn’t necessarily improve the sound.
Setting up Bluetooth connection on the App (you can skip this step since you can do pairing on Bluetooth setting).
Step 1
On Android Studio – Create a new project with Navigation Drawer Activity.
Name your Application
In AndroidManifest.xml copy and paste this code:
<uses-permission android:name="android.permission.BLUETOOTH_PRIVILEGED" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
This will allows the app to manage the Bluetooth related matters – discovery, pairing and more.
When you turn on your earbuds for the first time – it will automatically pairs with your phones.
app > java > appName_fragment2 > Right Click to create a new blank fragment and then give it a name. Mine is BassBooster
Implements
View.OnClickListener, CompoundButton.OnCheckedChangeListener, SeekBar.OnSeekBarChangeListener
in BassBooster.java the fragment you just created for interactions with button, seekbar.
Go to res > layout > fragment_bass_booster.xml (this is user interface that Android Studio automatically creates when we create a new fragment) add the following:
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1">
<Switch
android:id="@+id/switch"
android:layout_width="79dp"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginRight="@dimen/default_gap"
android:layout_marginTop="@dimen/default_gap"
android:text="FLAT"
android:layout_alignParentRight="true"
android:layout_marginEnd="@dimen/default_gap" />
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="501dp"
android:layout_weight="1"
android:orientation="vertical">
<SeekBar
android:id="@+id/seekBar1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<SeekBar
android:id="@+id/seekBar2"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<SeekBar
android:id="@+id/seekBar3"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<SeekBar
android:id="@+id/seekBar4"
android:layout_width="match_parent"
android:layout_height="18dp" />
<SeekBar
android:id="@+id/seekBar5"
android:layout_width="match_parent"
android:layout_height="18dp" />
<SeekBar
android:id="@+id/seekBar6"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<SeekBar
android:id="@+id/seekBar7"
android:layout_width="match_parent"
android:layout_height="12dp" />
<SeekBar
android:id="@+id/seekBar8"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom = "true"
android:orientation="horizontal">
<Button
android:id="@+id/btnConStatus"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@color/design_default_color_primary"
android:text=""
app:layout_constraintBottom_toBottomOf="parent" />
</LinearLayout>
</LinearLayout>
Then go back to BassBooster.java
// Equalizer interface Switch mSwitch; Equalizer mEqualizer; TextView bassLevel; static final int MAX_SLIDERS = 8; SeekBar mSlider[] = new SeekBar[MAX_SLIDERS]; int num_sliders = 0; int min_level = 0; int max_level = 100; Button mFlat; Button btnSimpleSnackbar;
We need to track buttons, seekBar in fragment_bass_booster.xml
A button (R.id.button) to FLAT the sound effect (R.id.button)
A switch to switch on/off sound effect (R.id.switch)
Most phones will display 5 bands of different frequency ranges. Here we include the possible sliders – up to 8 sliders.
mSwitch = view.findViewById(R.id.switch); mSwitch.setOnCheckedChangeListener(this); mFlat = view.findViewById(R.id.button); mFlat.setOnClickListener(this); btnSimpleSnackbar = view.findViewById(R.id.btnConStatus); mSlider[0] = view.findViewById(R.id.seekBar1); mSlider[1] = view.findViewById(R.id.seekBar2); mSlider[2] = view.findViewById(R.id.seekBar3); mSlider[3] = view.findViewById(R.id.seekBar4); mSlider[4] = view.findViewById(R.id.seekBar5); mSlider[5] = view.findViewById(R.id.seekBar6); mSlider[6] = view.findViewById(R.id.seekBar7); mSlider[7] = view.findViewById(R.id.seekBar8);
Back to BassBooster.java, since we can’t get the sessionID, let’s set it by default – zero.
I also pre-set the first band with an increase in level of 4.
mEqualizer = new Equalizer(0, 0);
if (mEqualizer != null) {
mEqualizer.setEnabled(true);
int num_bands = mEqualizer.getNumberOfBands();
num_sliders = num_bands;
short r[] = mEqualizer.getBandLevelRange();
min_level = r[0];
max_level = r[1];
mEqualizer.setBandLevel((short)4, (short)1);
for (int i = 0; i < num_sliders && i < MAX_SLIDERS; i++)
{
mSlider[i].setOnSeekBarChangeListener(this);
}
To display the bands
for (int i = num_sliders ; i < MAX_SLIDERS; i++)
{
mSlider[i].setVisibility(View.GONE);
}
We also need to update the equalizer with
UpdateUI();
That’s we’ll create
private void UpdateUI() {
updateSliders();
mSwitch.setChecked(mEqualizer.getEnabled());
}
private void updateSliders() {
for (int i = 0; i < num_sliders; i++)
{
int level;
if (mEqualizer != null)
level = mEqualizer.getBandLevel ((short)i);
else
level = 0;
int pos = 100 * level / (max_level - min_level) + 50;
mSlider[i].setProgress (pos);
}
}
And other methods (set all band to zero and switch on/off sound effect)
When users touch on FLAT button – all bands are set to Zero effect.
public void onClick(View v) {
if (v == mFlat){
setFlat();
}
}
private void setFlat() {
if (mEqualizer != null)
{
for (int i = 0; i < num_sliders; i++)
{
mEqualizer.setBandLevel ((short)i, (short)0);
}
}
UpdateUI();
}
To switch on/off sound effect
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (buttonView == mSwitch ){
mEqualizer.setEnabled (isChecked);
}
}
How to manage Bluetooth connection, pairing name of Bluetooth earbuds. We’ll create a service called BlueService.java (it’s up to you to name the service)
file > new > service > service to create BlueService.java
in public int onStartCommand(Intent intent, int flags, int startId) section, add the following, this will listen the Bluetooth connection when a device is connected and disconnected.
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
registerReceiver(mBroadcastReceiver, filter); //unregister after use
In this service we set up a method to send Bluetooth status, device name to other activities.
private void sendMessageToActivity(String name, String blueStatus) {
Intent intent = new Intent("bluetoothHandset");
intent.putExtra(name, blueStatus);
LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}
Possible scenarios
The L- earbud is primary but it runs out of battery, and you want to use the R – earbud to listen to music.
You connect your phone with with the R.
The L is charged for a while and ready to use, you switch it on and it’s also paired with your phones. Now your phone connects with both L and R earbuds, but this is when the problem arises they are not synced to each other.
You need to write a function for your app that can detect this matter and “forget” the R earbud.
If earbuds’ Bluetooth chip supports hear-through tech – the mic can pick the surrounding sound and users can hear the outside world we can build this feature in the App.
To be continued…
Please check back for update!
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