Android Open Source - BLEService Scanning Activity

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Back to project page BLEService.
License

The source code is released under:
Copyright (c) 2014, Ratio LLC. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: ...
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Java Source Code

package org.bluetooth.bledemo;
//from ww  w  .  java2  s.  co  m
import org.bluetooth.bledemo.R;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.app.ListActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;

public class ScanningActivity extends ListActivity {
  
  private static final long SCANNING_TIMEOUT = 5 * 1000; /* 5 seconds */
  private static final int ENABLE_BT_REQUEST_ID = 1;
  
  private boolean mScanning = false;
  private Handler mHandler = new Handler();
  private DeviceListAdapter mDevicesListAdapter = null;
  private BleWrapper mBleWrapper = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        // create BleWrapper with empty callback object except uiDeficeFound function (we need only that here) 
        mBleWrapper = new BleWrapper(this, new BleWrapperUiCallbacks.Null() {
          @Override
          public void uiDeviceFound(final BluetoothDevice device, final int rssi, final byte[] record) {
            handleFoundDevice(device, rssi, record);
          }
        });
        
        // check if we have BT and BLE on board
        if(mBleWrapper.checkBleHardwareAvailable() == false) {
          bleMissing();
        }
    }

    @Override
    protected void onResume() {
      super.onResume();
      
      // on every Resume check if BT is enabled (user could turn it off while app was in background etc.)
      if(mBleWrapper.isBtEnabled() == false) {
      // BT is not turned on - ask user to make it enabled
      Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, ENABLE_BT_REQUEST_ID);
        // see onActivityResult to check what is the status of our request
    }
      
      // initialize BleWrapper object
        mBleWrapper.initialize();
      
      mDevicesListAdapter = new DeviceListAdapter(this);
        setListAdapter(mDevicesListAdapter);
      
        // Automatically start scanning for devices
      mScanning = true;
    // remember to add timeout for scanning to not run it forever and drain the battery
    addScanningTimeout();      
    mBleWrapper.startScanning();
    
        invalidateOptionsMenu();
    };
    
    @Override
    protected void onPause() {
      super.onPause();
      mScanning = false;      
      mBleWrapper.stopScanning();
      invalidateOptionsMenu();
      
      mDevicesListAdapter.clearList();
    };
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.scanning, menu);

        if (mScanning) {
            menu.findItem(R.id.scanning_start).setVisible(false);
            menu.findItem(R.id.scanning_stop).setVisible(true);
            menu.findItem(R.id.scanning_indicator)
                .setActionView(R.layout.progress_indicator);

        } else {
            menu.findItem(R.id.scanning_start).setVisible(true);
            menu.findItem(R.id.scanning_stop).setVisible(false);
            menu.findItem(R.id.scanning_indicator).setActionView(null);
        }
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.scanning_start:
              mScanning = true;
              mBleWrapper.startScanning();
                break;
            case R.id.scanning_stop:
              mScanning = false;
              mBleWrapper.stopScanning();
                break;
            case R.id.show_hr_demo_item:
              startHRDemo();
              break;
        }
        
        invalidateOptionsMenu();
        return true;
    }

    private void startHRDemo() {
        startActivity(new Intent(this, HRDemoActivity.class));      
    }
    
    /* user has selected one of the device */
    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        final BluetoothDevice device = mDevicesListAdapter.getDevice(position);
        if (device == null) return;
        
        final Intent intent = new Intent(this, PeripheralActivity.class);
        intent.putExtra(PeripheralActivity.EXTRAS_DEVICE_NAME, device.getName());
        intent.putExtra(PeripheralActivity.EXTRAS_DEVICE_ADDRESS, device.getAddress());
        intent.putExtra(PeripheralActivity.EXTRAS_DEVICE_RSSI, mDevicesListAdapter.getRssi(position));
        
        if (mScanning) {
            mScanning = false;
            invalidateOptionsMenu();
            mBleWrapper.stopScanning();
        }

        startActivity(intent);
    }    
    
    /* check if user agreed to enable BT */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // user didn't want to turn on BT
        if (requestCode == ENABLE_BT_REQUEST_ID) {
          if(resultCode == Activity.RESULT_CANCELED) {
          btDisabled();
            return;
        }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

  /* make sure that potential scanning will take no longer
   * than <SCANNING_TIMEOUT> seconds from now on */
  private void addScanningTimeout() {
    Runnable timeout = new Runnable() {
            @Override
            public void run() {
              if(mBleWrapper == null) return;
                mScanning = false;
                mBleWrapper.stopScanning();
                invalidateOptionsMenu();
            }
        };
        mHandler.postDelayed(timeout, SCANNING_TIMEOUT);
  }    

  /* add device to the current list of devices */
    private void handleFoundDevice(final BluetoothDevice device,
            final int rssi,
            final byte[] scanRecord)
  {
    // adding to the UI have to happen in UI thread
    runOnUiThread(new Runnable() {
      @Override
      public void run() {
        mDevicesListAdapter.addDevice(device, rssi, scanRecord);
        mDevicesListAdapter.notifyDataSetChanged();
      }
    });
  }  

    private void btDisabled() {
      Toast.makeText(this, "Sorry, BT has to be turned ON for us to work!", Toast.LENGTH_LONG).show();
        finish();      
    }
    
    private void bleMissing() {
      Toast.makeText(this, "BLE Hardware is required but not available!", Toast.LENGTH_LONG).show();
        finish();      
    }
}
Java Source Code List
