android藍牙搜索打卡

佈局代碼：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/bt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="open bluetooth"
       />

    <Button
        android:id="@+id/bt1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="open bluetooth"
       />
    <Button
        android:id="@+id/bt2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="open bluetooth"
       />

<TextView
    android:id="@+id/tv"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"></TextView>

</LinearLayout>

java代碼：

package com.example.bluetooth;

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.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.util.Set;

public class MainActivity extends AppCompatActivity {
BluetoothAdapter adapter;
private TextView tv;
private MyReciver reciver;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        reciver=new MyReciver();
        tv=findViewById(R.id.tv);
        findViewById(R.id.bt).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                 adapter =BluetoothAdapter.getDefaultAdapter();
                Set<BluetoothDevice> bondedDevices = adapter.getBondedDevices();
                for (BluetoothDevice d :
                        bondedDevices) {

                  tv.append(  d.getAddress()+"\n");

                }
                adapter.enable();
            }
        });
        findViewById(R.id.bt1).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                adapter.disable();
            }
        });


        IntentFilter filter =new IntentFilter();
        filter.addAction(BluetoothDevice.ACTION_FOUND);

        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        this.registerReceiver(reciver,filter);


        findViewById(R.id.bt2).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setProgressBarVisibility(true);
                setTitle("正在掃描。。。");
                if (adapter .isDiscovering()) {
                    adapter.cancelDiscovery();
                }
                adapter.startDiscovery();

            }
        });
    }

    class  MyReciver extends BroadcastReceiver{


        @Override
        public void onReceive(Context context, Intent intent) {
            String action=intent.getAction();
            if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)){
                setProgressBarVisibility(false);
                setTitle("已經搜索完成");



            }else if (action.equals(BluetoothDevice.ACTION_FOUND)){
                BluetoothDevice device =intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                if (device.getBondState()!=BluetoothDevice.BOND_BONDED){
                    tv.append(device.getName()+":"+device.getAddress()+"\n");


                }

            }

        }
    }


}

添加權限：

  <uses-permission android:name="android.permission.BLUETOOTH"></uses-permission>

    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />