APK:SerialPortFinder,显示串口列表

百分之50 

 

SerialPortFinder 方法 有点意思 这个方法是不涉及底层的，没有native方法，也不需要c和h文件 就能识别串口

MainActivity.java

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package com.gatsby.serialport;   import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast;   import androidx.appcompat.app.AppCompatActivity;   import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.List;   import android_serialport_api.SerialPort; import android_serialport_api.SerialPortFinder;   public class MainActivity extends AppCompatActivity implements View.OnClickListener {       SerialPortFinder mSerialPortFinder;       final String[] devices = new SerialPortFinder().getAllDevicesPath();     final List<String> data = new ArrayList<>();         protected SerialPort mSerialPort;     protected InputStream mInputStream;     protected OutputStream mOutputStream;       private String prot = "/dev/ttyS3";     private int baudrate = 9600;     //数据     private static long i = 0;       private Toast mToast;       private Thread receiveThread;     private Thread sendThread;         @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);           ListView listView = findViewById(R.id.id_list);         listView.setAdapter(bA);           getSerialPortPression();           initLayout();           mToast = Toast.makeText(this, "", Toast.LENGTH_SHORT);       }       private void initLayout() {         findViewById(R.id.btn_open).setOnClickListener(MainActivity.this);         findViewById(R.id.btn_send).setOnClickListener(MainActivity.this);         findViewById(R.id.btn_close).setOnClickListener(MainActivity.this);     }       @Override     public void onClick(View v) {         switch (v.getId()) {             case R.id.btn_open:                 showTip("btn_open");                   // 打开                 try {                     mSerialPort = new SerialPort(new File(prot), baudrate,8,1,'N');                     mInputStream = mSerialPort.getInputStream();                     mOutputStream = mSerialPort.getOutputStream();                     receiveThread();                 } catch (SecurityException e) {                     e.printStackTrace();                 } catch (IOException e) {                     //打开失败                     Log.e("gatsby", "open serialport default");                     e.printStackTrace();                 }                   break;             case R.id.btn_send:                 showTip("btn_send");                 // 发送                 sendThread = new Thread() {                     @Override                     public void run() {                         while (true) {                             try {                                 i++;                                 mOutputStream.write((String.valueOf(i)).getBytes());                                 //发送成功                                 Log.i("gatsby", "send serialport sucess!" + i);                                 Thread.sleep(50);                             } catch (Exception e) {                                 //发送失败                                 Log.i("gatsby", "send serialport default!");                                 e.printStackTrace();                             }                         }                       }                 };                 sendThread.start();                   break;             case R.id.btn_close:                 showTip("btn_close");                   closeSerialPort();                   break;             default:                 break;         }     }       private void receiveThread() {         // 接收         receiveThread = new Thread() {             @Override             public void run() {                 while (true) {                     int size;                     try {                         byte[] buffer = new byte[512];                         if (mInputStream == null)                             return;                         size = mInputStream.read(buffer);                         if (size > 0) {                             String recinfo = new String(buffer, 0,                                     size);                             Log.i("gatsby", "recevier serialport info :" + recinfo); //                            sb = recinfo; //                            handler.sendEmptyMessage(1);                         }                     } catch (IOException e) {                         e.printStackTrace();                     }                 }             }         };//111         receiveThread.start();     }       /**      * 关闭串口      */     public void closeSerialPort() {           if (mSerialPort != null) {             mSerialPort.close();         }         if (mInputStream != null) {             try {                 mInputStream.close();             } catch (IOException e) {                 e.printStackTrace();             }         }         if (mOutputStream != null) {             try {                 mOutputStream.close();             } catch (IOException e) {                 e.printStackTrace();             }         }       }       private void showTip(final String str) {         mToast.setText(str);         mToast.show();     }       public void getSerialPortPression() {         if (devices.length > 0) {             for (String device : devices) {                   File file = new File(device);                 String path = file.getAbsolutePath();                   StringBuilder permission = new StringBuilder();                 permission.append("[");                 permission.append(file.canRead() ? " 可读" : "不可读");                 permission.append(file.canWrite() ? "  可写 " : " 不可写 ");                 permission.append(file.canExecute() ? "可执行" : "不可执行");                 permission.append("]");                   String msg = "(" + path + ")" + " 权限:" + permission;                 data.add(msg);             }         }     }       BaseAdapter bA = new BaseAdapter() {         @Override         public int getCount() {             return devices.length;         }           @Override         public Object getItem(int position) {             return devices[position];         }           @Override         public long getItemId(int position) {             return position;         }           @Override         public View getView(int position, View convertView, ViewGroup parent) {             if (convertView == null)                 convertView = getLayoutInflater().inflate(R.layout.item_layout, null);             TextView textView = convertView.findViewById(R.id.id_item_text);             textView.setText(data.get(position));               return convertView;         }     }; }