查找藍(lán)牙設(shè)備

查找分為兩部分：第一是已經(jīng)綁定的設(shè)備，第二個(gè)搜索新的設(shè)備；于已綁定的設(shè)備，我們可以直接通過(guò)BluetoothAdapter的getBondedDevices()這個(gè)方法來(lái)獲得。該方法返回的是一個(gè)Set<BluetoothDevice>我們可以直接從人獲得我們需要的信息：

 BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
    Set<BluetoothDevice> devices = adapter.getBondedDevices();
    for (BluetoothDevice device : devices) {
        System.out.println(device.getName() + " : " + device.getAddress());
    }

查找新的設(shè)備，我們要調(diào)用startDiscovery()方法，這個(gè)方法并不會(huì)在我們的程序中執(zhí)行，它是系統(tǒng)進(jìn)程來(lái)的，然后通過(guò)異步發(fā)送廣播的方式來(lái)通知。所以我們還要注冊(cè)一個(gè)廣播接收器來(lái)接收系統(tǒng)的廣播，這個(gè)廣播的action為BluetoothDevice.ACTION_FOUND。它攜帶兩個(gè)值，一個(gè)是BluetoothDevice.EXTRA_DEVICE另一個(gè)是BluetoothDevice.EXTRA_CLASS分別表示哪一個(gè)具體的設(shè)備和這個(gè)設(shè)備的類型。

private class BluetoothDeviceScanListener extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        // 這里可以把我們的將我們的設(shè)備添加到一個(gè)列表中
        System.out.println(device.getName() + " : " + device.getAddress());
    }
}

設(shè)置藍(lán)牙可搜索

/**
     * 打開(kāi)藍(lán)牙可見(jiàn)性
     * @param context
     */
    public void enableVisibly(Context context) {
        Intent discoverableIntent = new
                Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
        context.startActivity(discoverableIntent);
    }

在官方的文檔中一直強(qiáng)調(diào)，查找設(shè)備這個(gè)動(dòng)作是會(huì)消耗大量的系統(tǒng)資源的，而且它會(huì)大大減少藍(lán)牙的可用帶寬，所以當(dāng)我們找到了目標(biāo)設(shè)備后，應(yīng)該由我們主動(dòng)調(diào)用cancelDiscovery()這個(gè)方法來(lái)取消搜索，而不應(yīng)該期待默認(rèn)的搜索時(shí)間到了，由系統(tǒng)來(lái)取消搜索。

小Demo（可以不看）

這里我們用一個(gè)listview來(lái)展示數(shù)據(jù)；
list的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/textview1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textview2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

數(shù)據(jù)的設(shè)配器用到了ViewHolder來(lái)優(yōu)化listview

package com.example.phonejason;

import android.bluetooth.BluetoothDevice;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

/**
 * Created by 小新 on 2016/6/11.
 */
public class DeviceAdapter extends BaseAdapter {
    private Context mContext;
    private List<BluetoothDevice> mDate;

    public  DeviceAdapter(List<BluetoothDevice> Date, Context context){
        mDate = Date;
        mContext = context;

    }
    @Override
    public int getCount() {
        return mDate.size();
    }

    @Override
    public Object getItem(int position) {
        return mDate.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder = null;
        if(convertView==null){
            viewHolder = new ViewHolder();
            convertView = LayoutInflater.from(mContext).inflate(R.layout.deviceadapter_layout,null);
            viewHolder.textView1 = (TextView)convertView.findViewById(R.id.textview1);
            viewHolder.textView2 = (TextView)convertView.findViewById(R.id.textview2);
            convertView.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder) convertView.getTag();
        }
        //獲取藍(lán)牙設(shè)備
        BluetoothDevice bluetoothDevice = (BluetoothDevice) getItem(position);
        viewHolder.textView1.setText("Name="+bluetoothDevice.getName());
        viewHolder.textView2.setText("Address"+bluetoothDevice.getAddress());
        return convertView;
    }

    public class ViewHolder{
        public TextView textView1;
        public  TextView textView2;

    }
    public void refresh(List<BluetoothDevice> data){
        mDate = data;
        notifyDataSetChanged();
    }
}

頁(yè)面包含一個(gè)listview，菜單包含

數(shù)據(jù)展示

代碼：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.phonejason.MainActivity">
       <ListView
           android:id="@+id/device_list"
           android:layout_width="match_parent"
           android:layout_height="match_parent"></ListView>
       
</LinearLayout>

菜單

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" tools:context=".MainActivity">
    <item android:id="@+id/enable_visiblity" android:title="可見(jiàn)"
        android:orderInCategory="100" app:showAsAction="always|withText" />

    <item android:id="@+id/find_device" android:title="查找設(shè)備"
        android:orderInCategory="100" app:showAsAction="always|withText" />

    <item android:id="@+id/bonded_device" android:title="綁定設(shè)備"
        android:orderInCategory="100" app:showAsAction="always|withText" />
</menu>

在MainActivityfest中實(shí)現(xiàn)的邏輯

package com.example.phonejason;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    public static final int REQUEST_CODE = 0;
    private List<BluetoothDevice> mDeviceList = new ArrayList<>();
    private List<BluetoothDevice> mBondedDeviceList = new ArrayList<>();

    private BlueToothController mController = new BlueToothController();
    private ListView mListView;
    //設(shè)配器
    private DeviceAdapter mAdapter;
    private Toast mToast;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initUI();

        IntentFilter filter = new IntentFilter();
        //開(kāi)始查找
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
        //結(jié)束查找
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        //查找設(shè)備
        filter.addAction(BluetoothDevice.ACTION_FOUND);
        //設(shè)備掃描模式改變
        filter.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
        //綁定狀態(tài)
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);

        registerReceiver(mReceiver, filter);

        mController.turnOnBlueTooth(this, REQUEST_CODE);

    }


    private BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            //開(kāi)始搜索藍(lán)牙（開(kāi)始查找）
            if( BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action) ) {
                setProgressBarIndeterminateVisibility(true);
                //初始化數(shù)據(jù)列表
                mDeviceList.clear();
                mAdapter.notifyDataSetChanged();
            }//搜索藍(lán)牙結(jié)束（結(jié)束查找）
            else if( BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                setProgressBarIndeterminateVisibility(false);
            }//找到藍(lán)牙（查找設(shè)備）
            else if( BluetoothDevice.ACTION_FOUND.equals(action)) {
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                //找到一個(gè)，添加一個(gè)
                mDeviceList.add(device);
                mAdapter.notifyDataSetChanged();
            }//設(shè)備掃描模式改變
            else if( BluetoothAdapter.ACTION_SCAN_MODE_CHANGED.equals(action)) {
                int scanMode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE,0);
                if( scanMode == BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
                    setProgressBarIndeterminateVisibility(true);
                }
                else {
                    setProgressBarIndeterminateVisibility(false);
                }
            }//綁定狀態(tài)
            else if( BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action) ) {
                BluetoothDevice remoteDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                if( remoteDevice == null ) {
                    showToast("no device");
                    return;
                }
                int status = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE,0);
                if( status == BluetoothDevice.BOND_BONDED) {
                    showToast("Bonded " + remoteDevice.getName());
                }
                else if( status == BluetoothDevice.BOND_BONDING){
                    showToast("Bonding " + remoteDevice.getName());
                }
                else if(status == BluetoothDevice.BOND_NONE){
                    showToast("Not bond " + remoteDevice.getName());
                }
            }
        }
    };

    //初始化UI控件
    private void initUI() {
        mListView = (ListView) findViewById(R.id.device_list);
        mAdapter = new DeviceAdapter(mDeviceList, this);
        mListView.setAdapter(mAdapter);
         //給listview設(shè)置點(diǎn)擊事件
        mListView.setOnItemClickListener(bindDeviceClick);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //注銷廣播
        unregisterReceiver(mReceiver);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //加載菜單
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    private void showToast(String text) {

        if( mToast == null) {
            mToast = Toast.makeText(this, text, Toast.LENGTH_SHORT);
        }
        else {
            mToast.setText(text);
        }
        mToast.show();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.enable_visiblity) {
            mController.enableVisibly(this);
        }
        else if( id == R.id.find_device) {
            //查找設(shè)備
            mAdapter.refresh(mDeviceList);
            mController.findDevice();
            mListView.setOnItemClickListener(bindDeviceClick);
        }
        else if (id == R.id.bonded_device) {
            //查看已綁定設(shè)備
            mBondedDeviceList = mController.getBondedDeviceList();
            mAdapter.refresh(mBondedDeviceList);
            mListView.setOnItemClickListener(null);
        }

        return super.onOptionsItemSelected(item);
    }
    //設(shè)配器控件的點(diǎn)擊事件
    private AdapterView.OnItemClickListener bindDeviceClick = new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            BluetoothDevice device = mDeviceList.get(i);
            device.createBond();
        }
    };

}