Android蓝牙的开启-搜索-关闭演示

package com.example.demo;import java.util.Set;import android.app.Activity;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.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener{private TextView tv;private Button start, end, search;private BluetoothAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv = (TextView) findViewById(R.id.textView);start = (Button) findViewById(R.id.start);end = (Button) findViewById(R.id.end);search = (Button) findViewById(R.id.search);start.setOnClickListener(this);end.setOnClickListener(this);search.setOnClickListener(this);//获取蓝牙适配器的实例adapter = BluetoothAdapter.getDefaultAdapter();//定义一个数据集,用来存储先有以有的蓝牙设备列表Set device = adapter.getBondedDevices();//如果有if (device.size() > 0){//遍历集合，添加到列表for (BluetoothDevice bluetoothDevice : device){tv.setText(bluetoothDevice.getName() + ","+ bluetoothDevice.getAddress());}}//注册正在搜索蓝牙时发送的广播IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);registerReceiver(receiver, filter);//注册搜索完成后发送的广播filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);registerReceiver(receiver, filter);}private BroadcastReceiver receiver = new BroadcastReceiver(){@Overridepublic void onReceive(Context context, Intent intent){String action = intent.getAction();// 如果找到了设备if (BluetoothDevice.ACTION_FOUND.equals(action)){BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);// 判断配对，如果没有配对，就添加到列表if (device.getBondState() != BluetoothDevice.BOND_BONDED){tv.append(device.getName() + ":" + device.getAddress());}//如果搜索完成} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){setTitle("扫描完成");}}};@Overridepublic void onClick(View v){switch (v.getId()){case R.id.start://静默开启蓝牙adapter.enable();break;case R.id.search://扫描蓝牙setTitle("正在扫描...");// 如果正在搜索(扫描只能执行一次，如果蓝牙正在扫描，又执行了一次扫描，会报错)if (adapter.isDiscovering()){// 就取消adapter.cancelDiscovery();}// 开启蓝牙搜索，此函数是运行在子线程中的adapter.startDiscovery();break;case R.id.end://静默关闭adapter.disable();break;default:break;}}}
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