package com.example.vpoorn001c.ble;

import android.app.Activity;

import android.app.ListActivity;

import android.bluetooth.BluetoothAdapter;

import android.bluetooth.BluetoothDevice;

import android.bluetooth.BluetoothManager;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.os.Bundle;

import android.os.Handler;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ListView;

import android.widget.TextView;

import android.widget.Toast;

import java.util.ArrayList;

import java.util.UUID;

/**

* Activity for scanning and displaying available Bluetooth LE devices.

*/

public class DeviceScanActivity extends ListActivity {

private LeDeviceListAdapter mLeDeviceListAdapter;

private BluetoothAdapter mBluetoothAdapter;

private boolean mScanning;

private Handler mHandler;

private static final int REQUEST_ENABLE_BT = 1;

// Stops scanning after 10 seconds.

private static final long SCAN_PERIOD = 10000;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

getActionBar().setTitle(R.string.title_devices);

mHandler = new Handler();

// Use this check to determine whether BLE is supported on the device. Then you can

// selectively disable BLE-related features.

if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {

Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();

finish();

}

// Initializes a Bluetooth adapter. For API level 18 and above, get a reference to

// BluetoothAdapter through BluetoothManager.

final BluetoothManager bluetoothManager =

(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);

mBluetoothAdapter = bluetoothManager.getAdapter();

// Checks if Bluetooth is supported on the device.

if (mBluetoothAdapter == null) {

Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();

finish();

return;

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.main, menu);

if (!mScanning) {

menu.findItem(R.id.menu_stop).setVisible(false);

menu.findItem(R.id.menu_scan).setVisible(true);

menu.findItem(R.id.menu_refresh).setActionView(null);

} else {

menu.findItem(R.id.menu_stop).setVisible(true);

menu.findItem(R.id.menu_scan).setVisible(false);

menu.findItem(R.id.menu_refresh).setActionView(

R.layout.actionbar_indeterminate_progress);

}

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.menu_scan:

mLeDeviceListAdapter.clear();

scanLeDevice(true);

break;

case R.id.menu_stop:

scanLeDevice(false);

break;

}

return true;

}

@Override

protected void onResume() {

super.onResume();

// Ensures Bluetooth is enabled on the device. If Bluetooth is not currently enabled,

// fire an intent to display a dialog asking the user to grant permission to enable it.

if (!mBluetoothAdapter.isEnabled()) {

if (!mBluetoothAdapter.isEnabled()) {

Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);

}

}

// Initializes list view adapter.

mLeDeviceListAdapter = new LeDeviceListAdapter();

setListAdapter(mLeDeviceListAdapter);

scanLeDevice(true);

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

// User chose not to enable Bluetooth.

if (requestCode == REQUEST_ENABLE_BT && resultCode == Activity.RESULT_CANCELED) {

finish();

return;

}

super.onActivityResult(requestCode, resultCode, data);

}

@Override

protected void onPause() {

super.onPause();

scanLeDevice(false);

mLeDeviceListAdapter.clear();

}

@Override

protected void onListItemClick(ListView l, View v, int position, long id) {

final BluetoothDevice device = mLeDeviceListAdapter.getDevice(position);

if (device == null) return;

final Intent intent = new Intent(this, DeviceControlActivity.class);

intent.putExtra(DeviceControlActivity.EXTRAS_DEVICE_NAME, device.getName());

intent.putExtra(DeviceControlActivity.EXTRAS_DEVICE_ADDRESS, device.getAddress());

if (mScanning) {

mBluetoothAdapter.stopLeScan(mLeScanCallback);

mScanning = false;

}

startActivity(intent);

}

private void scanLeDevice(final boolean enable) {

if (enable) {

// Stops scanning after a pre-defined scan period.

mHandler.postDelayed(new Runnable() {

@Override

public void run() {

mScanning = false;

mBluetoothAdapter.stopLeScan(mLeScanCallback);

invalidateOptionsMenu();

}

}, SCAN_PERIOD);

mScanning = true;

mBluetoothAdapter.startLeScan(mLeScanCallback);

} else {

mScanning = false;

mBluetoothAdapter.stopLeScan(mLeScanCallback);

}

invalidateOptionsMenu();

}

// Adapter for holding devices found through scanning.

private class LeDeviceListAdapter extends BaseAdapter {

private ArrayList<BluetoothDevice> mLeDevices;

private LayoutInflater mInflator;

public LeDeviceListAdapter() {

super();

mLeDevices = new ArrayList<BluetoothDevice>();

mInflator = DeviceScanActivity.this.getLayoutInflater();

}

public void addDevice(BluetoothDevice device) {

if(!mLeDevices.contains(device)) {

mLeDevices.add(device);

}

}

public BluetoothDevice getDevice(int position) {

return mLeDevices.get(position);

}

public void clear() {

mLeDevices.clear();

}

@Override

public int getCount() {

return mLeDevices.size();

}

@Override

public Object getItem(int i) {

return mLeDevices.get(i);

}

@Override

public long getItemId(int i) {

return i;

}

@Override

public View getView(int i, View view, ViewGroup viewGroup) {

ViewHolder viewHolder;

// General ListView optimization code.

if (view == null) {

view = mInflator.inflate(R.layout.listitem_device, null);

viewHolder = new ViewHolder();

viewHolder.deviceAddress = (TextView) view.findViewById(R.id.device_address);

viewHolder.deviceName = (TextView) view.findViewById(R.id.device_name);

view.setTag(viewHolder);

} else {

viewHolder = (ViewHolder) view.getTag();

}

BluetoothDevice device = mLeDevices.get(i);

final String deviceName = device.getName();

if (deviceName != null && deviceName.length() > 0)

viewHolder.deviceName.setText(deviceName);

else

viewHolder.deviceName.setText(R.string.unknown_device);

viewHolder.deviceAddress.setText(device.getAddress());

return view;

}

}

// Device scan callback.

private BluetoothAdapter.LeScanCallback mLeScanCallback =

new BluetoothAdapter.LeScanCallback() {

@Override

public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {

runOnUiThread(new Runnable() {

@Override

public void run() {

mLeDeviceListAdapter.addDevice(device);

mLeDeviceListAdapter.notifyDataSetChanged();

}

});

}

};

static class ViewHolder {

TextView deviceName;

TextView deviceAddress;

}

}