Wednesday, May 25, 2011

Get the list of paired Bluetooth devices

With bluetoothAdapter, the list of paired BluetoothDevice can be retrieved by calling getBondedDevices() function.

Get the list of paired Bluetooth devices

Implement a new activity ListPairedDevicesActivity.java
package com.exercise.AndroidBluetooth;

import java.util.Set;

import android.app.ListActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothClass;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class ListPairedDevicesActivity extends ListActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);

ArrayAdapter<String> btArrayAdapter
= new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1);

BluetoothAdapter bluetoothAdapter
= BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> pairedDevices
= bluetoothAdapter.getBondedDevices();

if (pairedDevices.size() > 0) {
for (BluetoothDevice device : pairedDevices) {
String deviceBTName = device.getName();
String deviceBTMajorClass
= getBTMajorDeviceClass(device
.getBluetoothClass()
.getMajorDeviceClass());
btArrayAdapter.add(deviceBTName + "\n"
+ deviceBTMajorClass);
}
}
setListAdapter(btArrayAdapter);

}

private String getBTMajorDeviceClass(int major){
switch(major){
case BluetoothClass.Device.Major.AUDIO_VIDEO:
return "AUDIO_VIDEO";
case BluetoothClass.Device.Major.COMPUTER:
return "COMPUTER";
case BluetoothClass.Device.Major.HEALTH:
return "HEALTH";
case BluetoothClass.Device.Major.IMAGING:
return "IMAGING";
case BluetoothClass.Device.Major.MISC:
return "MISC";
case BluetoothClass.Device.Major.NETWORKING:
return "NETWORKING";
case BluetoothClass.Device.Major.PERIPHERAL:
return "PERIPHERAL";
case BluetoothClass.Device.Major.PHONE:
return "PHONE";
case BluetoothClass.Device.Major.TOY:
return "TOY";
case BluetoothClass.Device.Major.UNCATEGORIZED:
return "UNCATEGORIZED";
case BluetoothClass.Device.Major.WEARABLE:
return "AUDIO_VIDEO";
default: return "unknown!";
}
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);

Intent intent = new Intent();
setResult(RESULT_OK, intent);
finish();
}

}


Modify main.xml to add a button to start ListPairedDevicesActivity.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<TextView
android:id="@+id/bluetoothstate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/listpaireddevices"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="List Paired Devices"
android:enabled="false"
/>
<TextView
android:id="@+id/bluetoothstate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>


Modify AndroidBluetooth.java
package com.exercise.AndroidBluetooth;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class AndroidBluetooth extends Activity {

private static final int REQUEST_ENABLE_BT = 1;
private static final int REQUEST_PAIRED_DEVICE = 2;

/** Called when the activity is first created. */
Button btnListPairedDevices;
TextView stateBluetooth;
BluetoothAdapter bluetoothAdapter;

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

btnListPairedDevices = (Button)findViewById(R.id.listpaireddevices);

stateBluetooth = (TextView)findViewById(R.id.bluetoothstate);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

CheckBlueToothState();

btnListPairedDevices.setOnClickListener(btnListPairedDevicesOnClickListener);
}

private void CheckBlueToothState(){
if (bluetoothAdapter == null){
stateBluetooth.setText("Bluetooth NOT support");
}else{
if (bluetoothAdapter.isEnabled()){
if(bluetoothAdapter.isDiscovering()){
stateBluetooth.setText("Bluetooth is currently in device discovery process.");
}else{
stateBluetooth.setText("Bluetooth is Enabled.");
btnListPairedDevices.setEnabled(true);
}
}else{
stateBluetooth.setText("Bluetooth is NOT Enabled!");
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
}
}

private Button.OnClickListener btnListPairedDevicesOnClickListener
= new Button.OnClickListener(){

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setClass(AndroidBluetooth.this, ListPairedDevicesActivity.class);
startActivityForResult(intent, REQUEST_PAIRED_DEVICE);
}};

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if(requestCode == REQUEST_ENABLE_BT){
CheckBlueToothState();
}if (requestCode == REQUEST_PAIRED_DEVICE){
if(resultCode == RESULT_OK){

}
}
}
}


Modify AndroidManifest.xml to add activity ListPairedDevicesActivity, also include permission of "android.permission.BLUETOOTH".
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.exercise.AndroidBluetooth"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.BLUETOOTH"></uses-permission>

<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".AndroidBluetooth"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ListPairedDevicesActivity"
android:label="AndroidBluetooth: List of Paired Devices"/>
</application>
</manifest>


Download the files.


Related:
- Detect Bluetooth state
- Turn-On BlueTooth using intent of BluetoothAdapter.ACTION_REQUEST_ENABLE
- Start Bluetooth Discoverable and register BroadcastReceiver for ACTION_SCAN_MODE_CHANGED

1 comment:

Anonymous said...

I pretty much copied and pasted this into my app. THANK YOU SO MUCH!!
Proper JOB! You rock!