1. get a BluetoothAdapter instance by BluetoothAdapter.getDefaultAdapter();
2. use an intent with uri BluetoothAdapter.ACTION_REQUEST_ENABLE to open the blue tooth
3. get a devices Set by adapter.getBondedDevices();
Or:
1. get a BluetoothAdapter instance by BluetoothAdapter.getDefaultAdapter();
2. new a BroadcastReceiver Child to receive the intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
3. use bluetoothAdapter.startDiscovery() to search surounding bluetooth device . It is an asynchronous
function and will send the intent with BluetoothDevice.EXTRA_DEVICE
BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Log.i("l","address:"+device.getAddress());
Make your device discoverable:
Intent discoverableIntent=new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);
startActivity(discoverableIntent);
Don't forget the permission:
<uses-permission android:name="android.permission.BLUETOOTH"/> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
Full code:
package com.blue_tooth_test;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import java.util.Iterator;
import java.util.Set;
public class BlueToothTest extends Activity
{
private Button btn;
private Button btn2;
private Button btn3;
private LinearLayout ll;
private BluetoothAdapter bluetoothAdapter;
private BluetoothReceiver bluetoothReceiver;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
ll=new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams params=new
LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
btn=new Button(this);
btn.setText("Bluetooth Scan");
btn.setOnClickListener(clickListener);
btn2=new Button(this);
btn2.setText("Set visible");
btn2.setOnClickListener(clickListener2);
btn3=new Button(this);
btn3.setText("Scan device");
btn3.setOnClickListener(clickListener3);
ll.addView(btn,params);
ll.addView(btn2,params);
ll.addView(btn3,params);
setContentView(ll);
bluetoothAdapter=BluetoothAdapter.getDefaultAdapter();
bluetoothReceiver=new BluetoothReceiver();
IntentFilter intentFilter=new IntentFilter();
intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(bluetoothReceiver, intentFilter);
}
private OnClickListener clickListener=new OnClickListener(){
public void onClick(View arg0) {
// throw new UnsupportedOperationException("Not supported yet.");
//1. get a BluetoothAdapter instance;
BluetoothAdapter adapter=BluetoothAdapter.getDefaultAdapter();
if(adapter!=null){
Log.i("l","Bluetooth device OK");
//2. if current bluetooth enable
if(!adapter.isEnabled()){
Intent intent=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
BlueToothTest.this.startActivity(intent);
}
//3. get all the paired bluetooth device
//that means the remote device list;
Set<BluetoothDevice> devices=adapter.getBondedDevices();
if(devices.size()>0){
Iterator iter=devices.iterator();
while(iter.hasNext()){
BluetoothDevice bluetoothDevice=(BluetoothDevice)iter.next();
Log.i("l","address:"+bluetoothDevice.getAddress());
}
}
}
else{
Log.i("l","No bluetooth device");
}
}
};
private OnClickListener clickListener2=new OnClickListener(){
public void onClick(View arg0) {
// throw new UnsupportedOperationException("Not supported yet.");
Intent discoverableIntent=new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);
startActivity(discoverableIntent);
}
};
private OnClickListener clickListener3=new OnClickListener(){
public void onClick(View arg0) {
// throw new UnsupportedOperationException("Not supported yet.");
// The discovery process usually involves an inquiry scan of about 12 seconds, followed by a page scan of each new device to retrieve its Bluetooth name.
// This is an asynchronous call, it will return immediately. Register for ACTION_DISCOVERY_STARTED and ACTION_DISCOVERY_FINISHED intents to determine exactly
// when the discovery starts and completes. Register for ACTION_FOUND to be notified as remote Bluetooth devices are found.
// Device discovery is a heavyweight procedure. New connections to remote Bluetooth devices should not be attempted while discovery is in progress, and existing
// connections will experience limited bandwidth and high latency. Use cancelDiscovery() to cancel an ongoing discovery. Discovery is not managed by the Activity,
// but is run as a system service, so an application should always call cancelDiscovery() even if it did not directly request a discovery, just to be sure.
// Device discovery will only find remote devices that are currently discoverable (inquiry scan enabled). Many Bluetooth devices are not discoverable by default,
// and need to be entered into a special mode.
// If Bluetooth state is not STATE_ON, this API will return false. After turning on Bluetooth, wait for ACTION_STATE_CHANGED with STATE_ON to get the updated value.
boolean result=bluetoothAdapter.startDiscovery();
Log.i("l","is any connectable device?:"+result);
}
};
@Override
protected void onDestroy() {
super.onDestroy();
this.unregisterReceiver(bluetoothReceiver);
}
private class BluetoothReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
// throw new UnsupportedOperationException("Not supported yet.");
Log.i("l","received device");
String action=intent.getAction();
if(BluetoothDevice.ACTION_FOUND.equals(action)){
BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Log.i("l","address:"+device.getAddress());
}
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.blue_tooth_test"
android:versionCode="1"
android:versionName="1.0">
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<application android:label="@string/app_name" >
<activity android:name="BlueToothTest"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>