Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.robotic.goldenridge.blecontroller; import android.app.Activity; import android.app.ListActivity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothManager; import android.bluetooth.le.BluetoothLeScanner; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.nfc.Tag; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.NavUtils; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; import java.util.Set; /** * Activity for scanning and displaying available Bluetooth LE and Standard devices. */ public class DeviceScanActivity extends ListActivity { private String TAG = DeviceScanActivity.class.getSimpleName(); private LeDeviceListAdapter mLeDeviceListAdapter; private BluetoothAdapter mBluetoothAdapter; private boolean leScanning; private Handler mHandler; //integrating standard scanning private StandardDeviceListAdapter mStandardDeviceListAdapter; BluetoothDevice device; //replace deprecated method private BluetoothLeScanner les; 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); //getSupportActionBar().setTitle(R.string.title_devices); // 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 (Utility.isLE()) { 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.bt_support_err, Toast.LENGTH_SHORT).show(); finish(); return; } else { //les = mBluetoothAdapter.getBluetoothLeScanner(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_scan, menu); if (!leScanning) { 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: clearListAdapter(); setscanatate(true); break; case R.id.menu_stop: setscanatate(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. if (Utility.isLE()) { mLeDeviceListAdapter = new LeDeviceListAdapter(); setListAdapter(mLeDeviceListAdapter); } else { mStandardDeviceListAdapter = new StandardDeviceListAdapter(); setListAdapter(mStandardDeviceListAdapter); } setscanatate(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(); setscanatate(false); clearListAdapter(); } @Override protected void onListItemClick(ListView l, View v, int position, long id) { //// TODO: 4/3/2016 Log.d(TAG, "listItem clicked");// DEBUG can't be reached when in standard mode if (Utility.isLE()) { //LEDevice device = mLeDeviceListAdapter.getDevice(position); if (device == null) return; MessageHandler.blc = new BLEConnection(device.getAddress(), MainActivity.mContext); // if (leScanning) { // mBluetoothAdapter.stopLeScan(mLeScanCallback); // leScanning = false; // } } else { // Standard device // TODO device = mStandardDeviceListAdapter.getDevice(position); if (device == null) { Log.e(TAG, "device : null"); return; } Log.d(TAG, device.getAddress()); MessageHandler.btc = new BSConnection(device.getAddress()); } setscanatate(false); //back to parrent NavUtils.navigateUpFromSameTask(this); } private void clearListAdapter() { if (mLeDeviceListAdapter != null) { mLeDeviceListAdapter.clear(); } if (mStandardDeviceListAdapter != null) { mStandardDeviceListAdapter.clear(); } } private void setscanatate(boolean state) { if (Utility.isLE()) { scanLeDevice(state); } else { scanStandardDevice(state); } leScanning = state; } private void scanLeDevice(final boolean enable) { if (enable) { // Stops scanning after a pre-defined scan period. mHandler.postDelayed(new Runnable() { @Override public void run() { leScanning = false; mBluetoothAdapter.stopLeScan(mLeScanCallback); //les.startScan(mLeScanCallback);// TODO: replace with startScan() invalidateOptionsMenu(); } }, SCAN_PERIOD); leScanning = true; mBluetoothAdapter.startLeScan(mLeScanCallback); } else { leScanning = false; mBluetoothAdapter.stopLeScan(mLeScanCallback); } invalidateOptionsMenu(); } private void scanStandardDevice(final boolean enable) { if (enable) { // Stops scanning after a pre-defined scan period. mHandler.postDelayed(new Runnable() { @Override public void run() { leScanning = false; mBluetoothAdapter.cancelDiscovery(); invalidateOptionsMenu(); } }, SCAN_PERIOD); leScanning = true; mBluetoothAdapter.startDiscovery(); } else { leScanning = false; mBluetoothAdapter.cancelDiscovery(); } 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; } } // Adapter for holding devices found through scanning. private class StandardDeviceListAdapter extends BaseAdapter { private ArrayList<BluetoothDevice> mStandardDevices; private LayoutInflater mInflator; public StandardDeviceListAdapter() { super(); Log.d(TAG, "StandardDeviceListAdapter"); Set<BluetoothDevice> temp = mBluetoothAdapter.getBondedDevices(); mStandardDevices = new ArrayList<BluetoothDevice>(temp); //get bond device mInflator = DeviceScanActivity.this.getLayoutInflater(); } public void addDevice(BluetoothDevice device) { if (!mStandardDevices.contains(device)) { mStandardDevices.add(device); } } public BluetoothDevice getDevice(int position) { return mStandardDevices.get(position); } public void clear() { mStandardDevices.clear(); } @Override public int getCount() { return mStandardDevices.size(); } @Override public Object getItem(int i) { return mStandardDevices.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 = mStandardDevices.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; } }