安卓串口通信接收与发送完整demo

以下是一个简单的安卓串口通信接收与发送的完整示例：

1. 首先，需要在你的 AndroidManifest.xml 文件中添加以下权限：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.WRITE_SMS" />
<uses-permission android:name="android.permission.RECEIVE_MMS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
<uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
<uses-permission android:name="android.permission.USE_CREDENTIALS" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.NFC" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_LOGS" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.GET_TASKS" />
<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />
<uses-permission android:name="android.permission.RESTART_PACKAGES" />
<uses-permission android:name="android.permission.SET_TIME_ZONE" />
<uses-permission android:name="android.permission.SET_WALLPAPER" />
<uses-permission android:name="android.permission.SET_WALLPAPER_HINTS" />
<uses-permission android:name="android.permission.WRITE_APN_SETTINGS" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.RECEIVE_USER_PRESENT" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.MEDIA_CONTENT_CONTROL" />
<uses-permission android:name="android.permission.READ_CALL_LOG" />
<uses-permission android:name="android.permission.WRITE_CALL_LOG" />
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_HISTORY_BOOKMARKS" />
<uses-permission android:name="android.permission.WRITE_HISTORY_BOOKMARKS" />
<uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW" />
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
<uses-permission android:name="android.permission.PACKAGE_USAGE_STATS" />
<uses-permission android:name="android.permission.READ_PHONE_NUMBERS" />
<uses-permission android:name="android.permission.ANSWER_PHONE_CALLS" />

2. 在你的 build.gradle 文件中添加以下依赖：

implementation 'com.felhr:usbserial:2.0.2'

3. 创建一个名为 SerialPortActivity 的活动，并在其中添加以下代码：

import android.content.Context;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.felhr.usbserial.UsbSerialDevice;
import com.felhr.usbserial.UsbSerialInterface;

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;

public class SerialPortActivity extends AppCompatActivity {

    private static final String TAG = SerialPortActivity.class.getSimpleName();

    private TextView mReceivedDataTextView;

    private UsbManager mUsbManager;
    private UsbSerialDevice mSerialDevice;

    private final Handler mHandler = new Handler();

    private final Runnable mRunnable = new Runnable() {
        @Override
        public void run() {
            if (mSerialDevice != null) {
                byte[] buffer = new byte[256];
                int numBytesRead = mSerialDevice.read(buffer);
                if (numBytesRead > 0) {
                    try {
                        String receivedData = new String(buffer, 0, numBytesRead, "UTF-8");
                        mReceivedDataTextView.append(receivedData);
                    } catch (UnsupportedEncodingException e) {
                        Log.e(TAG, "UnsupportedEncodingException: " + e.getMessage());
                    }
                }
            }
            mHandler.postDelayed(this, 1000);
        }
    };

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

        mReceivedDataTextView = findViewById(R.id.received_data_text_view);

        mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);

        // 查找可用的 USB 设备
        Map<String, UsbDevice> usbDevices = mUsbManager.getDeviceList();
        if (!usbDevices.isEmpty()) {
            for (Map.Entry<String, UsbDevice> entry : usbDevices.entrySet()) {
                UsbDevice device = entry.getValue();
                if (device.getVendorId() == 0x1a86 && device.getProductId() == 0x7523) {
                    // 找到了指定的 USB 设备，尝试连接
                    connect(device);
                    break;
                }
            }
        }
    }

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

        mHandler.post(mRunnable);
    }

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

        mHandler.removeCallbacks(mRunnable);
    }

    private void connect(UsbDevice device) {
        UsbSerialDevice serialDevice = UsbSerialDevice.createUsbSerialDevice(device, mUsbManager);
        if (serialDevice != null) {
            if (serialDevice.open()) {
                serialDevice.setBaudRate(9600);
                serialDevice.setDataBits(UsbSerialInterface.DATA_BITS_8);
                serialDevice.setStopBits(UsbSerialInterface.STOP_BITS_1);
                serialDevice.setParity(UsbSerialInterface.PARITY_NONE);
                serialDevice.setFlowControl(UsbSerialInterface.FLOW_CONTROL_OFF);
                serialDevice.read(mCallback);
                mSerialDevice = serialDevice;
            }
        }
    }

    private final UsbSerialInterface.UsbReadCallback mCallback = new UsbSerialInterface.UsbReadCallback() {
        @Override
        public void onReceivedData(byte[] data) {
            try {
                String receivedData = new String(data, "UTF-8");
                mReceivedDataTextView.append(receivedData);
            } catch (UnsupportedEncodingException e) {
                Log.e(TAG, "UnsupportedEncodingException: " + e.getMessage());
            }
        }
    };

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

        if (mSerialDevice != null) {
            mSerialDevice.close();
        }
    }
}

4. 在你的 activity_serial_port.xml 文件中添加以下内容：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

        <TextView
            android:id="@+id/received_data_text_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="16sp" />

    </ScrollView>

</LinearLayout>

以上代码将创建一个基本的界面，其中将显示从串口接收到的数据。

注意：上述示例代码是一个非常基本的示例，可能需要根据你的具体需要进行修改和适当的优化。