Android 之路59---经典蓝牙（未完成）

导读

1.蓝牙的开启与查找
2.蓝牙通信：蓝牙聊天室

蓝牙的开启与查找

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.hala.bluetoothchat">

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


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    tools:context="com.hala.bluetoothchat.MainActivity">

    <Button
        android:id="@+id/paired"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:text="已配对设备"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/scan"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="扫描附近蓝牙设备"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/paired" />


</android.support.constraint.ConstraintLayout>

MainActivity.java

package com.hala.bluetoothchat;

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.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.util.Set;

public class MainActivity extends AppCompatActivity {

    public static final  String TAG="BlueToothChat";
    public static final int REQUEST_CODE = 10;


    private BluetoothAdapter bluetoothAdapter;
    private Button paired;
    private Button scan;

    private BroadcastReceiver mBluetoothReceiver=new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action=intent.getAction();
            Log.d(TAG,"Action:"+action);
            //如果已经连接上
            if(action.equals(BluetoothDevice.ACTION_FOUND)){
                BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                Log.d(TAG,"New Device name:"+device.getName());
                Log.d(TAG,"New Device addr:"+device.getAddress());
            //如果扫描完毕
            }else if(action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)){
                Log.d(TAG,"Distory Done!");
            }
        }
    };


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

        //判断设备是否支持蓝牙
        bluetoothAdapter=BluetoothAdapter.getDefaultAdapter();
        if(bluetoothAdapter==null){
            Log.e(TAG,"Device not support bluetooth");
        }else {
            Toast.makeText(this, "设备支持蓝牙！", Toast.LENGTH_SHORT).show();
        }

        paired=(Button)findViewById(R.id.paired);
        scan=(Button)findViewById(R.id.scan);

        //查找已配对设备，获取名称，地址
        paired.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Set<BluetoothDevice> pairedDevice=bluetoothAdapter.getBondedDevices();
                for(BluetoothDevice device:pairedDevice){
                    Log.d(TAG,"Device name:"+device.getName());
                    Log.d(TAG,"Device addr:"+device.getAddress());
                }
            }
        });

        scan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //如果正在扫描，就停止扫描
                if(bluetoothAdapter.isDiscovering()){
                    bluetoothAdapter.cancelDiscovery();
                }
                //开始扫描
                bluetoothAdapter.startDiscovery();
            }
        });

        IntentFilter filter=new IntentFilter();
        filter.addAction(BluetoothDevice.ACTION_FOUND);
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        registerReceiver(mBluetoothReceiver,filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mBluetoothReceiver);
    }

    @Override
    protected void onStart() {
        super.onStart();

        if(!bluetoothAdapter.isEnabled()){
            //向系统请求开启蓝牙
            Intent enableIntent=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableIntent, REQUEST_CODE);
        }else{
            //已经开启蓝牙
            Toast.makeText(this, "蓝牙已经开启了！", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==REQUEST_CODE){
            //已经开启蓝牙
            Toast.makeText(this, "蓝牙已经开启了！", Toast.LENGTH_SHORT).show();
        }
    }
}

显示结果

蓝牙通信：蓝牙聊天室