藍牙搜索和配對連接相關

package com.example.bluetoothdemo;

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.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.TextView;

import java.util.Iterator;
import java.util.Set;

public class MainActivity extends AppCompatActivity {

    private String Tag = MainActivity.class.getSimpleName();

    private TextView tvMain;
    private Button btnSetBluetoothVisible;
    private Button btnSetScanMode;

    private BluetoothAdapter bluetoothAdapter;
    private BluetoothReceiver bluetoothReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tvMain = findViewById(R.id.tv_main);
        btnSetBluetoothVisible = findViewById(R.id.btn_set_bluetooth_visible);
        btnSetScanMode = findViewById(R.id.btn_set_scan_mode);

        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        bluetoothReceiver=new BluetoothReceiver();

        tvMain.setOnClickListener(v -> {

            if (bluetoothAdapter == null) {
                Log.e(Tag, "本機器沒有藍牙設備");
                return;
            }
            Log.e(Tag, "本機器有藍牙設備");

            if (!bluetoothAdapter.isEnabled()) {
                Log.e(Tag, "本機器藍牙設備不可用");
                startActivity(new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE));
                return;
            }
            Log.e(Tag, "本機器藍牙設備可用");

            Set<BluetoothDevice> devices = bluetoothAdapter.getBondedDevices();


            if (devices == null) {
                Log.e(Tag, "獲取本機綁定的設備錯誤");
                return;
            }

            if (devices.size() < 1) {
                Log.e(Tag, "本機未綁定過其它藍牙設備");
                return;
            }

            for (Iterator iterator = devices.iterator(); iterator.hasNext(); ) {
                BluetoothDevice item = (BluetoothDevice) iterator.next();
                Log.e(Tag, "已經綁定的藍牙地址:" + item.getAddress() + "    名稱：" + item.getName());
            }
        });

        btnSetBluetoothVisible.setOnClickListener(v -> {
            Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);//設置藍牙多少秒可見
            intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
            startActivity(intent);
        });

        btnSetScanMode.setOnClickListener(v -> {
            bluetoothAdapter.startDiscovery();
        });
        IntentFilter intentFilter=new IntentFilter(BluetoothDevice.ACTION_FOUND);

        registerReceiver(bluetoothReceiver,intentFilter);

    }

    private class BluetoothReceiver extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) {
            String action =intent.getAction();
            if(BluetoothDevice.ACTION_FOUND.contains(action)){
                BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                Log.e(Tag, "掃描設備地址："+device.getAddress() + "    名稱：" + device.getName());
            }
        }
    }

}