仅扫描设备成功，暂时未在listview中显示，log中已经能打印出 

package com.example.suruixue.bletest;import android.app.ListActivity;import android.bluetooth.BluetoothAdapter;import android.bluetooth.BluetoothDevice;import android.bluetooth.BluetoothGatt;import android.bluetooth.BluetoothGattCallback;import android.bluetooth.BluetoothGattCharacteristic;import android.bluetooth.BluetoothGattDescriptor;import android.bluetooth.BluetoothManager;import android.bluetooth.BluetoothProfile;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.ParcelUuid;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import java.util.ArrayList;import java.util.Arrays;public class BleMainActivity extends AppCompatActivity{//public class BleMainActivity extends ListActivity {
        private BluetoothAdapter mBluetoothAdapter;    private BluetoothDevice mBtDevice;    private String TAG = "BleMainActivity";    private BluetoothLeScanner bleScanner;    //button    private Button mOpenBt;    private Button mStartScan;    private Button mStopScan;    private Button mConnectDevice;    //arrarylist    private ListView mBleListView;    private ArrayList
     
       mLeDevicesList;    private LayoutInflater mInflator;    private LeDeviceListAdapter mLeListAdapter;   // private ListAdapter mLeListAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_ble_main);        Log.e(TAG,"srx--oncreate >>>");        if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {            Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();        } else {            Toast.makeText(this, R.string.ble_supported, Toast.LENGTH_SHORT).show();        }        Log.e(TAG,"srx--oncreate end");        //button init        mOpenBt = (Button)findViewById(R.id.open_bt);        mOpenBt.setOnClickListener(mBtnClickListener);        mStartScan = (Button)findViewById(R.id.start_scan);        mStartScan.setOnClickListener(mBtnClickListener);        mStopScan = (Button)findViewById(R.id.stop_scan);        mStopScan.setOnClickListener(mBtnClickListener);        mConnectDevice = (Button)findViewById(R.id.connect_device);        mConnectDevice.setOnClickListener(mBtnClickListener);        //1.initialize bluetooth adapter        BluetoothManager bluetoothManager =(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);        mBluetoothAdapter = bluetoothManager.getAdapter();    }    @Override    protected void onResume() {        super.onResume();        mBleListView = (ListView)findViewById(R.id.list_view) ;        mLeListAdapter =  new LeDeviceListAdapter();        //setListAdapter(mLeListAdapter);        mBleListView.setAdapter(mLeListAdapter);        //mBleListView.setOnItemClickListener(mItemClickListener);        //scanLeDevice();    }    private AdapterView.OnItemClickListener mItemClickListener = new AdapterView.OnItemClickListener() {        @Override        public void onItemClick(AdapterView
       parent, View view, int position, long id) {        }    };    private View.OnClickListener mBtnClickListener = new View.OnClickListener() {        @Override        public void onClick(View v) {            Log.e(TAG,"srx--onClickt");            switch (v.getId()){                case R.id.open_bt:                    Log.e(TAG,"srx--will openbt");                    openBt(); //                    break;                case R.id.start_scan:                    scanBleDevice(true); //1.call scan                    break;                case R.id.stop_scan:                    scanBleDevice(false);                    break;             /*   case R.id.connect_device:                    connectBleDevice(); //4.may need connect some one bluetoothdevice such as when click this device.                    break;*/                default:                    break;            }        }    };    private void openBt(){        //2.open bluetooth        Log.e(TAG,"srx-openBt>>");        if((mBluetoothAdapter == null) || !mBluetoothAdapter.isEnabled()){            Log.e(TAG,"srx-openBt-");            Intent enableBleIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);            startActivityForResult(enableBleIntent, 0);        }    }//3.defination callback   private ScanCallback bleScanCallback = new ScanCallback() {        @Override        public void onScanResult(int callbackType, ScanResult result) {            super.onScanResult(callbackType, result);            byte[] scanData = result.getScanRecord().getBytes();            //把byte数组转成16进制字符串，方便查看            //Log.e("TAG","onScanResult :"+CYUtils.Bytes2HexString(scanData));            Log.e("TAG", "onScanResult :" + result.getScanRecord().toString());//4.print scanrecord in callback onxxx            /*add scaned device to arraylist data source*/            mBtDevice = result.getDevice();            mLeListAdapter.addLeDevice(mBtDevice);            mLeListAdapter.notifyDataSetChanged();         }    };    private void scanBleDevice(boolean enable){         //  mBluetoothAdapter.startLeScan(); //old method        bleScanner = mBluetoothAdapter.getBluetoothLeScanner();//1.get blescanner        if(enable && (bleScanner!=null)) {            bleScanner.startScan(bleScanCallback);//2.call startscan(callback)        } else {            bleScanner.stopScan(bleScanCallback);        }    }    //connect bluetooth   /* private void connectBleDevice(){        BluetoothGatt btGatt =          mBtDevice.connectGatt(BleMainActivity.this, false, new BluetoothGattCallback() {            @Override            public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {                super.onConnectionStateChange(gatt, status, newState);                if(newState == BluetoothProfile.STATE_CONNECTED){                    Log.e(TAG,"srx--connected, discover services");                    gatt.discoverServices(); //call discoverService                }            }            @Override            public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {                super.onCharacteristicRead(gatt, characteristic, status);                // String value = UtilOnStr.parseBytesToHexString(characteristic.getValue());                Log.e(TAG,gatt.getDevice().getName() + " srx-read " + characteristic.getValue());            }            @Override            public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {                super.onCharacteristicChanged(gatt, characteristic);                Log.e(TAG,gatt.getDevice().getName() + " srx-changed " + characteristic.getValue());            }            @Override            public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {                super.onDescriptorWrite(gatt, descriptor, status);                Log.e(TAG,gatt.getDevice().getName() + " srx-write status:" + status);            }            // discover service,callback            @Override            public void onServicesDiscovered(BluetoothGatt gatt, int status) {                super.onServicesDiscovered(gatt, status);                Log.e(TAG,gatt.getDevice().getName() + " srx-service discovered status:" + status);            }        });        //get ble device supported all services/fuction.        //btGatt.getServices();    }*/    @Override    protected void onStop() {        super.onStop();    }    @Override    protected void onDestroy() {        super.onDestroy();    }    private class LeDeviceListAdapter extends BaseAdapter {        private ArrayList
      
        mLeDevices;        private LayoutInflater mInflator;        public LeDeviceListAdapter() {            super();            mLeDevices = new ArrayList
       
        ();            mInflator = BleMainActivity.this.getLayoutInflater();        }        public void addLeDevice(BluetoothDevice device) {            if(!mLeDevices.contains(device)) {                mLeDevices.add(device);            }        }        @Override        public int getCount() {            return 0;        }        @Override        public Object getItem(int position) {            return null;        }        @Override        public long getItemId(int position) {            return 0;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            return null;        }    }    }