Android传统（经典）蓝牙框架

//纯java的项目
android {
	compileOptions {
		sourceCompatibility JavaVersion.VERSION_1_8
		targetCompatibility JavaVersion.VERSION_1_8
	}
}

//有kotlin的项目还需要在project的build.gradle里添加
allprojects {
    tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8

        kotlinOptions {
            jvmTarget = '1.8'
            apiVersion = '1.3'
            languageVersion = '1.3'
        }
    }
}

dependencies {
	...
	implementation 'cn.wandersnail:classic-bluetooth:latestVersion'
	//额外依赖
	implementation 'cn.wandersnail:common-full:latestVersion'
}

allprojects {
	repositories {
		...
		mavenCentral()
		maven { url 'https://dl.bintray.com/wandersnail/androidx/' }
	}
}

//实例化并初始化
BTManager.getInstance().initialize(application);

BTManager manager = BTManager.getBuilder()
        .setExecutorService(executorService)//自定义线程池用来执行后台任务，也可使用默认
		.setObserveAnnotationRequired(false)//不强制使用{@link Observe}注解才会收到被观察者的消息，强制使用的话，性能会好一些
		.setMethodDefaultThreadMode(ThreadMode.MAIN)//指定回调方法和观察者方法的默认线程
		.build();
manager.initialize(application);

//如果中途需要修改配置重新实例化，调用此方法后即可重新构建BTManager实例
BTManager.getInstance().destroy();

BTManager.isDebugMode = true;;//开启日志打印

private DiscoveryListener discoveryListener = new DiscoveryListener() {
	@Override
	public void onDiscoveryStart() {
		//搜索开始
	}

	@Override
	public void onDiscoveryStop() {
		//搜索停止
	}

    /**
     * 搜索到蓝牙设备
     *
     * @param device 搜索到的设备
     * @param rssi   信号强度
     */
	@Override
	public void onDeviceFound(@NonNull BluetoothDevice device, int rssi) {
		//搜索结果
	}

	@Override
	public void onDiscoveryError(int errorCode, @NotNull String errorMsg) {
		switch(errorCode) {
			case ScanListener.ERROR_LACK_LOCATION_PERMISSION://缺少定位权限		
				break;
			case ScanListener.ERROR_LOCATION_SERVICE_CLOSED://位置服务未开启		
				break;
			case ScanListener.ERROR_SCAN_FAILED://搜索失败
				break;
		}
	}
};

BTManager.getInstance().addDiscoveryListener(discoveryListener);

BTManager.getInstance().startDiscovery();

BTManager.getInstance().stopDiscovery();

BTManager.getInstance().removeDiscoveryListener(discoveryListener);

public class MainActivity extends AppCompatActivity implements EventObserver {
    /**
     * 使用{@link Observe}确定要接收消息，{@link RunOn}指定在主线程执行方法，设置{@link Tag}防混淆后找不到方法
     */
    @Tag("onConnectionStateChanged") 
    @Observe
    @RunOn(ThreadMode.MAIN)
    @Override
    public void onConnectionStateChanged(@NonNull BluetoothDevice device, int state) {
        switch (state) {
            case Connection.STATE_CONNECTING:
                break;
            case Connection.STATE_PAIRING:
                break;
            case Connection.STATE_PAIRED:
                break;
            case Connection.STATE_CONNECTED:
                break;
            case Connection.STATE_DISCONNECTED:
                break;            
            case Connection.STATE_RELEASED:
                break;
        }
    }
	
    /**
     * 如果{@link BTManager.Builder#setObserveAnnotationRequired(boolean)}设置为false时，无论加不加{@link Observe}注解都会收到消息。
     * 设置为true时，必须加{@link Observe}才会收到消息。
     * 默认为false，方法默认执行线程在{@link BTManager.Builder#setMethodDefaultThreadMode(ThreadMode)}指定
     */
    @Observe
    @Override
    public void onRead(@NonNull BluetoothDevice device, @NonNull byte[] value) {
        Log.d("BTManager", "收到数据：" + StringUtils.toHex(value, " "));
    }
    
    @Override
    public void onWrite(@NonNull BluetoothDevice device, @NonNull String tag, @NonNull byte[] value, boolean result) {
        Log.d("BTManager", "写入结果：" + result);
    }
}

BTManager.getInstance().registerObserver(observer);

BTManager.getInstance().unregisterObserver(observer);

connection = BTManager.getInstance().createConnection(device, observer);//观察者监听连接状态
//如果传null，默认使用{@link #SPP_UUID}连接
connection.connect(uuid, new ConnectCallback() {
    @Override
    public void onSuccess() {
      
    }
    
    @Override
    public void onFail(@NonNull String errMsg, @Nullable Throwable e) {
    
    }
});

BTManager.getInstance().disconnectConnection(device);//断开指定连接
//BTManager.getInstance().disconnectAllConnections();//断开所有连接

BTManager.getInstance().releaseConnection(device);//释放指定连接
//BTManager.getInstance().releaseAllConnections();//释放所有连接

/**
 * 写数据，加入队列尾部
 *
 * @param tag      数据标识
 * @param value    要写入的数据
 * @param callback 写入回调。不为null时，写入结果以回调返回；传null时，写入结果以通知观察者方式返回
 */
connection.write(tag, value, new WriteCallback() {
    @Override
    public void onWrite(@NonNull BluetoothDevice device, @NonNull String tag, @NonNull byte[] value, boolean result) {
        
    }
});

/**
 * 写数据，加入队列最前
 *
 * @param tag      数据标识
 * @param value    要写入的数据
 * @param callback 写入回调。不为null时，写入结果以回调返回；传null时，写入结果以通知观察者方式返回
 */
connection.writeImmediately(tag, value, new WriteCallback() {
    @Override
    public void onWrite(@NonNull BluetoothDevice device, @NonNull String tag, @NonNull byte[] value, boolean result) {
     
    }
});

BTManager.getInstance().release();

-keep class * implements cn.wandersnail.commons.observer.Observe {
	public <methods>;
}