三、筛选蓝牙信息并连接（安卓蓝牙ble教程）

╰+攻爆jí腚メ 2022-02-15 12:26 397阅读 0赞

# 1、MainActivity.java #

注：如果复制代码进项目时显示红色，请按ALT+ENTER键导包（import class）

package club.stm32;
    
    import android.Manifest;
    import android.bluetooth.BluetoothAdapter;
    import android.bluetooth.BluetoothDevice;
    import android.bluetooth.BluetoothGatt;
    import android.bluetooth.BluetoothGattCallback;
    import android.content.pm.PackageManager;
    import android.os.Build;
    import android.os.Bundle;
    import android.support.v4.app.ActivityCompat;
    import android.support.v4.content.ContextCompat;
    import android.support.v7.app.AppCompatActivity;
    import android.util.Log;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;
    import android.widget.Toast;
    
    
    public class MainActivity extends AppCompatActivity {
    
        /**
         * 需要根据条件修改的参数
         */
        private String MacHeader = "A6:C0:80";  //蓝牙的Mac地址前六位，需要根据自己的蓝牙进行修改
    
    
        private BluetoothAdapter bluetoothAdapter;
        private Button btnCheckPermission;
        private TextView tvmsg;
        private Button btnSearchBLE;
        private BluetoothDevice mdevice;
        private BluetoothGatt bluetoothGatt;
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            getPermission();  //获取权限
            bluetoothInit();    //蓝牙初始化
            widgetInit();       //控件初始化
            widgetListener();   //控件监听
    
        }
    
        //获取权限
        private void getPermission() {
    
            //如果sdk版本大于23
            if (Build.VERSION.SDK_INT >=23){
    
                //如果没有权限
                if ((ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED))
                {
                    //动态申请权限
                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 10);
    
                }
            }
        }
    
        //控件初始化
        private void widgetInit() {
    
            //请自行提升到全局，原型是：Button startscan = findViewById(R.id.startscan);
            btnCheckPermission = findViewById(R.id.btnCheckPermission);
    
            //请自行提升到全局，原型是：TextView tvmsg = findViewById(R.id.tvmsg);
            tvmsg = findViewById(R.id.tvmsg);
    
            //请自行提升到全局，原型是：Button btnSearchBLE = findViewById(R.id.btnSearchBLE);
            btnSearchBLE = findViewById(R.id.btnSearchBLE);
        }
    
        //控件监听
        private void widgetListener() {
    
            //测试权限按钮监听
            btnCheckPermission.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int permissionCheck = ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION);
                    if (permissionCheck == PackageManager.PERMISSION_GRANTED) {//如果有权限
                        Toast.makeText(MainActivity.this, "hava this permission", Toast.LENGTH_SHORT).show();//toast信息
                        Log.d("权限：","有定位权限");//在logcat上打印信息
                        tvmsg.setText("有定位权限");
                    }else {
                        getPermission();//获取权限
                        Toast.makeText(MainActivity.this, "no this permission", Toast.LENGTH_SHORT).show();//toast信息
                        Log.d("权限：","无定位权限");//在logcat上打印信息
                        tvmsg.setText("无定位权限");
                    }
                }
            });
    
            //搜索蓝牙按钮监听
            btnSearchBLE.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //开始搜索蓝牙
                    bluetoothAdapter.startLeScan(mBLEScanCallback);
                }
            });
    
        }
    
        //mBLEScanCallback回调函数
        private BluetoothAdapter.LeScanCallback mBLEScanCallback = new BluetoothAdapter.LeScanCallback() {
            @Override
            public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {
    
                //打印蓝牙mac地址
                Log.d("BleMAC", device.getAddress());
                if(device.toString().indexOf(MacHeader) == 0){
                    Log.d("符合的蓝牙地址", device.getAddress());
                    bluetoothAdapter.stopLeScan(mBLEScanCallback);
                    //停止搜索蓝牙，降低功耗
                    bluetoothAdapter.stopLeScan(mBLEScanCallback);
                    //获取远程设备（连接蓝牙）原型是BluetoothDevice mdevice = bluetoothAdapter.getRemoteDevice(des);请自行提升全局
                    mdevice = bluetoothAdapter.getRemoteDevice(device.toString());
                    //连接bluetoothGatt 到这一步时，蓝牙已经连接上了
                    //原型是BluetoothGatt bluetoothGatt = device.connectGatt(MainActivity.this, false, bluetoothGattCallback); 请自行提升全局
                    //bluetoothGattCallback是蓝牙gatt回调函数，接下来会跳到bluetoothGattCallback函数
                    bluetoothGatt = mdevice.connectGatt(MainActivity.this, false, bluetoothGattCallback);
                    Log.d("已连接到蓝牙", device.getAddress());
                }
            }
        };
    
        //蓝牙回调函数
        private final BluetoothGattCallback bluetoothGattCallback = new BluetoothGattCallback() {
    
        };
    
    
    
        private void bluetoothInit() {
    
            //如果不支持蓝牙
            if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE))
            {
                //提示不支持蓝牙
                Toast.makeText(this, "程序不支持该设备", Toast.LENGTH_SHORT).show();
                //退出程序
                finish();
            }
            //创建蓝牙适配器原型是BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
            bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
            //如果蓝牙适配器为空
            if (bluetoothAdapter == null)
            {
                //显示设备无蓝牙
                Toast.makeText(this, "设备无蓝牙", Toast.LENGTH_SHORT).show();
                //退出
                finish();
            }
            //如果蓝牙未开启
            if (!bluetoothAdapter.isEnabled())
            {
                //不提示,直接开启蓝牙
                bluetoothAdapter.enable();
                //提示开启蓝牙中
                Toast.makeText(this, "开启蓝牙中,如果未开启,请检查应用权限", Toast.LENGTH_SHORT).show();
            }
        }
    }

# 2、布局文件activity\_main.xml #

<?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">
    
        <TextView
            android:layout_width="match_parent"
            android:layout_height="300dp"
            android:text="Hello World!"
            android:id="@+id/tvmsg"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
    
            <Button
                android:layout_weight="1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="测试权限"
                android:id="@+id/btnCheckPermission"
                />
    
            <Button
                android:layout_weight="1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="搜索蓝牙"
                android:id="@+id/btnSearchBLE"
                />
    
    
        </LinearLayout>
    
    
    
    </LinearLayout>

# 效果图： #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MjM0MDg3_size_16_color_FFFFFF_t_70][]

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