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.amobletool.bluetooth.le.downexample.ui; import android.Manifest; import android.annotation.SuppressLint; 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.bluetooth.le.ScanCallback; import android.bluetooth.le.ScanResult; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; 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 com.amobletool.bluetooth.le.R; import com.amobletool.bluetooth.le.downexample.MyApp; import java.util.ArrayList; /** * Activity for scanning and displaying available Bluetooth LE devices. */ @SuppressLint("NewApi") 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; // 10???. private static final long SCAN_PERIOD = 10000; private BluetoothLeScanner mBluetoothLeScanner; private static final int REQUEST_CODE_ACCESS_COARSE_LOCATION = 1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getActionBar().setTitle(R.string.title_devices); mHandler = new Handler(); // ???ble ?,??? if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) { Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show(); finish(); } // ? Bluetooth adapter, ?????(APIandroid4.3) final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); mBluetoothAdapter = bluetoothManager.getAdapter(); mBluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner(); // ??? if (mBluetoothAdapter == null) { Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show(); finish(); return; } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {// API level 23(Android 6.0) //??? if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { //?????? if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_COARSE_LOCATION)) { // showToast("Android 6.0???????Ble"); } //?? ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.ACCESS_COARSE_LOCATION }, REQUEST_CODE_ACCESS_COARSE_LOCATION); } } } @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(); // ??, ???,??????? 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(); } //DeviceControlActivity @Override protected void onListItemClick(ListView l, View v, int position, long id) { System.out.println("==position==" + position); 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); mBluetoothLeScanner.stopScan(mScanCallback); mScanning = false; } MyApp.getInstance().getDeviceName(device); this.finish(); // 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); mBluetoothLeScanner.stopScan(mScanCallback); invalidateOptionsMenu(); } }, SCAN_PERIOD); mScanning = true; // mBluetoothAdapter.startLeScan(mLeScanCallback); mBluetoothLeScanner.startScan(mScanCallback); } else { mScanning = false; // mBluetoothAdapter.stopLeScan(mLeScanCallback); mBluetoothLeScanner.stopScan(mScanCallback); } 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(); } }); } }; // 5.0+.??? private ScanCallback mScanCallback = new ScanCallback() { @Override public void onScanResult(int callbackType, ScanResult result) { super.onScanResult(callbackType, result); mLeDeviceListAdapter.addDevice(result.getDevice()); mLeDeviceListAdapter.notifyDataSetChanged(); } // @Override // public void onBatchScanResults(List<ScanResult> results) { // super.onBatchScanResults(results); // for (int i = 0; i < results.size(); i++) { // mLeDeviceListAdapter.addDevice(results.get(i).getDevice()); // mLeDeviceListAdapter.notifyDataSetChanged(); // } // } @Override public void onScanFailed(int errorCode) { super.onScanFailed(errorCode); } }; static class ViewHolder { TextView deviceName; TextView deviceAddress; } }