Android:蓝牙4.0-BLE-小结=1.0

浏览数：50 / 时间：2015年06月11日
需求:BLE连接和通讯(目前做到-设备开启-搜索设备-连接设备)
资源:来自网络的一些Demo和官方文档

效果图:


1-BLE是Android4.3版本以上才提供的API- 一些概念性的东西还是有必要了解一下

目前Android真机只能接受和控制产品-也就是client端-server端目前只能是产品-而苹果方面貌似手机可以作为接收端也可以作为发送端-

基本概念就是中央和周边--手机作为中央--产品作为周边--而两者通过BLE进行连接--

我是这么理解信息传递的--GATT协议中是以ATT作为基础的--他们包含的信息集合是Server -- server里面可以有很多的characti...而每一个特征就是我们需要的固定信息

如果理解有不当的地方可以指出来--毕竟我对于这一块的理解和认知也才几天-


2-下面进入正式的讲解分段吧

APP的权限问题
==调用蓝牙设备需要声明的权限==

<span style="font-size:14px;"><uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /></span>

==有时候我们的APP的各部分功能的实现是以蓝牙为基础的  那么我们需要说明该设备仅蓝牙适用== 

<span style="font-size:14px;"><uses-feature
        android:name="android.hardware.bluetooth_le"
        android:required="true" /></span>

3-建立一个新的工程-TestBlueTooth

贴出MainActivity.java的代码

package com.example.testbluetooth;

import java.util.ArrayList;

import android.app.Activity;
import android.app.ListActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothAdapter.LeScanCallback;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
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.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ListActivity {

	private final static String TAG = "BlueToohth_Test";
	private LeDeviceListAdapter mLeDeviceListAdapter;
	private BluetoothAdapter mBluetoothAdapter;
	private boolean mScanning;
	private Handler mHandler;

	private static final int REQUEST_ENABLE_BT = 1;
	// Stops scanning after 10 seconds.
	private static final long SCAN_PERIOD = 10000;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		getActionBar().setTitle(R.string.title_devices);
		mHandler = new Handler();
		
		// 判断是否支持BLE
		Log.i(TAG, "wheter_support_BLE");
		if (!getPackageManager().hasSystemFeature(
				PackageManager.FEATURE_BLUETOOTH_LE)) {
			Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT)
					.show();
			finish();
		}
		
		Log.i(TAG, "get_about_BLE_API");
		final BluetoothManager bluetoothManager =
                (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
        mBluetoothAdapter = bluetoothManager.getAdapter();

        
        if (mBluetoothAdapter == null) {
            Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
            finish();
            return;
        }

	}


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

		//进行蓝牙连接的判断
		// Ensures Bluetooth is enabled on the device. If Bluetooth is not

		Log.i(TAG, "connect_ble");
		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);
	}

	/**
	 * 对搜索到的蓝牙设备进行现实
	 * 设备每一次进行扫描并且获得设备会进行一个提示刷新-通过notifyDataSetChange方法
	 * @author Admin
	 * 
	 */
	private class LeDeviceListAdapter extends BaseAdapter {
		private ArrayList<BluetoothDevice> mLeDevices;
		private LayoutInflater mInflator;

		public LeDeviceListAdapter() {
			super();
			mLeDevices = new ArrayList<BluetoothDevice>();
			mInflator = MainActivity.this.getLayoutInflater();
		}
		
		//添加设备进列表中
		public void addDevice(BluetoothDevice device) {
			if (!mLeDevices.contains(device)) {
				mLeDevices.add(device);
			}
		}

		//获取子项中对应的设备
		public BluetoothDevice getDevice(int position) {
			return mLeDevices.get(position);
		}

		//清空列表的数据
		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();
			}
			
			//对应的设备进行处理
			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;
		}
	}

	static class ViewHolder {
		TextView deviceName;
		TextView deviceAddress;
	}
	
	/**
	 * 扫描设备
	 * @param enable
	 */
	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);
                    invalidateOptionsMenu();
                }
            }, SCAN_PERIOD);

            mScanning = true;
            mBluetoothAdapter.startLeScan(mLeScanCallback);
        } else {
            mScanning = false;
            mBluetoothAdapter.stopLeScan(mLeScanCallback);
        }
        invalidateOptionsMenu();//更新菜单栏的信息
    }
	
	// 扫描到的蓝牙设备的响应设置
    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();
                }
            });
        }
    };
 
    
    @Override
    protected void onPause() {
        super.onPause();
        scanLeDevice(false);
        mLeDeviceListAdapter.clear();
    }

    //扫描和暂停的选项
    @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;
    }
    
    //点击事件
    @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;
    }
    
    

    /* 对每个子项进行事件的监听
     * @see android.app.ListActivity#onListItemClick(android.widget.ListView, android.view.View, int, long)
     */
    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        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);
            mScanning = false;
        }
        startActivity(intent);
    }
    
    @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);
    }

}


3.1-贴出---listitem_device.xml
</pre><pre name="code" class="java"><pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="wrap_content">
    <TextView android:id="@+id/device_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="24dp"/>
    <TextView android:id="@+id/device_address"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="12dp"/>
</LinearLayout>




未完待续










Android:蓝牙4.0-BLE-小结=1.0,,5-wow.com


          

            

              
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