Android Open Source - BleSensorTag Device Scan Activity

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License

The source code is released under:
MIT License
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Java Source Code

package sample.ble.sensortag;
/*  w  w w.  java  2s .  co m*/
import android.app.Activity;
import android.app.Fragment;
import android.app.ListActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import sample.ble.sensortag.adapters.BleDevicesAdapter;
import sample.ble.sensortag.ble.BleDevicesScanner;
import sample.ble.sensortag.ble.BleUtils;
import sample.ble.sensortag.config.AppConfig;
import sample.ble.sensortag.dialogs.EnableBluetoothDialog;
import sample.ble.sensortag.dialogs.ErrorDialog;
import sample.ble.sensortag.fusion.SensorFusionActivity;

/**
 * Activity for scanning and displaying available Bluetooth LE devices.
 */
public class DeviceScanActivity extends ListActivity
        implements ErrorDialog.ErrorDialogListener,
                   EnableBluetoothDialog.EnableBluetoothDialogListener {

    private static final int REQUEST_ENABLE_BT = 1;
    private static final long SCAN_PERIOD = 500;

    private BleDevicesAdapter leDeviceListAdapter;
    private BluetoothAdapter bluetoothAdapter;
    private BleDevicesScanner scanner;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setTitle(R.string.title_devices);

        setContentView(R.layout.device_scan_activity);
        final View emptyView = findViewById(R.id.empty_view);
        getListView().setEmptyView(emptyView);

        final int bleStatus = BleUtils.getBleStatus(getBaseContext());
        switch (bleStatus) {
            case BleUtils.STATUS_BLE_NOT_AVAILABLE:
                ErrorDialog.newInstance(R.string.dialog_error_no_ble).show(getFragmentManager(), ErrorDialog.TAG);
                return;
            case BleUtils.STATUS_BLUETOOTH_NOT_AVAILABLE:
                ErrorDialog.newInstance(R.string.dialog_error_no_bluetooth).show(getFragmentManager(), ErrorDialog.TAG);
                return;
            default:
                bluetoothAdapter = BleUtils.getBluetoothAdapter(getBaseContext());
        }

        if (bluetoothAdapter == null)
            return;

        // initialize scanner
        scanner = new BleDevicesScanner(bluetoothAdapter, new BluetoothAdapter.LeScanCallback() {
            @Override
            public void onLeScan(final BluetoothDevice device, final int rssi, byte[] scanRecord) {
                leDeviceListAdapter.addDevice(device, rssi);
                leDeviceListAdapter.notifyDataSetChanged();
            }
        });
        scanner.setScanPeriod(SCAN_PERIOD);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.gatt_scan, menu);

        if (!AppConfig.DEBUG)
            menu.findItem(R.id.menu_demo).setVisible(false);

        if (scanner == null || !scanner.isScanning()) {
            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.ab_indeterminate_progress);
        }
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_scan:
                leDeviceListAdapter.clear();
                if (scanner != null)
                    scanner.start();
                invalidateOptionsMenu();
                break;
            case R.id.menu_stop:
                if (scanner != null)
                    scanner.stop();
                invalidateOptionsMenu();
                break;
            case R.id.menu_demo:
                final Intent demoIntent = new Intent(
                        getBaseContext(), SensorFusionActivity.class);
                startActivity(demoIntent);
                break;
        }
        return true;
    }

    @Override
    protected void onResume() {
        super.onResume();

        if (bluetoothAdapter == null)
            return;

        // 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 (!bluetoothAdapter.isEnabled()) {
            final Fragment f = getFragmentManager().findFragmentByTag(EnableBluetoothDialog.TAG);
            if (f == null)
                new EnableBluetoothDialog().show(getFragmentManager(), EnableBluetoothDialog.TAG);
            return;
        }

        init();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // User chose not to enable Bluetooth.
        if (requestCode == REQUEST_ENABLE_BT) {
            if (resultCode == Activity.RESULT_CANCELED) {
                finish();
            } else {
                init();
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    @Override
    protected void onPause() {
        super.onPause();

        if (scanner != null)
            scanner.stop();
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        final BluetoothDevice device = leDeviceListAdapter.getDevice(position);
        if (device == null)
            return;

        final Intent intent = new Intent(this, DeviceServicesActivity.class);
        intent.putExtra(DeviceServicesActivity.EXTRAS_DEVICE_NAME, device.getName());
        intent.putExtra(DeviceServicesActivity.EXTRAS_DEVICE_ADDRESS, device.getAddress());
        startActivity(intent);
    }

    private void init() {
        if (leDeviceListAdapter == null) {
            leDeviceListAdapter = new BleDevicesAdapter(getBaseContext());
            setListAdapter(leDeviceListAdapter);
        }

        scanner.start();
        invalidateOptionsMenu();
    }

    @Override
    public void onEnableBluetooth(EnableBluetoothDialog f) {
        bluetoothAdapter.enable();
        init();
    }

    @Override
    public void onCancel(EnableBluetoothDialog f) {
        finish();
    }

    @Override
    public void onDismiss(ErrorDialog f) {
        finish();
    }
}
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