захвата RFID чтения с Arduino для андроида приложения с помощью USB-кабеля

Question

Я работаю на андроид приложение, которое получает чтение RFid от Arduino MEGA 2560. Это код для моего Android App

package com.example.halfway; 

import java.io.FileDescriptor; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 

import android.app.Activity; 
import android.app.PendingIntent; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.os.ParcelFileDescriptor; 
import android.text.TextUtils; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.CheckBox; 
import android.widget.EditText; 
import android.widget.TextView; 

import android.hardware.usb.UsbAccessory; 
import android.hardware.usb.UsbManager; 

public class Violation extends Activity implements Runnable { 

    private static final String ACTION_USB_PERMISSION = "com.google.android.DemoKit.action.USB_PERMISSION"; 
    private UsbManager mUsbManager; 
    private PendingIntent mPermissionIntent; 
    private boolean mPermissionRequestPending; 
    private UsbAccessory mAccessory; 
    private ParcelFileDescriptor mFileDescriptor; 
    private FileInputStream mInputStream; 
    private FileOutputStream mOutputStream; 

    EditText name,add,vnum,lnum; 
    Button one; 
    CheckBox a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,t,u,v,w,x,y,z; 

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


     name =(EditText) findViewById(R.id.fullname); 
     add =(EditText) findViewById(R.id.add); 
     vnum =(EditText) findViewById(R.id.plate_no); 
     lnum =(EditText) findViewById(R.id.license_no); 
     a=(CheckBox) findViewById(R.id.sec1_a); 
     b=(CheckBox)findViewById(R.id.sec1_b); 
     c=(CheckBox)findViewById(R.id.sec1_c); 
     d=(CheckBox)findViewById(R.id.sec1_d); 
     e=(CheckBox)findViewById(R.id.sec1_e); 
     f=(CheckBox)findViewById(R.id.sec1_f); 
     g=(CheckBox)findViewById(R.id.sec1_g); 
     h=(CheckBox)findViewById(R.id.sec1_h); 
     i=(CheckBox)findViewById(R.id.sec1_i); 
     j=(CheckBox)findViewById(R.id.sec1_j); 
     k=(CheckBox)findViewById(R.id.sec1_k); 
     l=(CheckBox)findViewById(R.id.sec1_l); 
     m=(CheckBox)findViewById(R.id.sec1_m); 
     n=(CheckBox)findViewById(R.id.sec1_n); 
     o=(CheckBox)findViewById(R.id.sec1_o); 
     p=(CheckBox)findViewById(R.id.sec1_p); 
     q=(CheckBox)findViewById(R.id.sec1_q); 
     r=(CheckBox)findViewById(R.id.sec1_r); 
     t=(CheckBox)findViewById(R.id.sec1_t); 
     u=(CheckBox)findViewById(R.id.sec1_u); 
     v=(CheckBox)findViewById(R.id.sec1_v); 
     w=(CheckBox)findViewById(R.id.sec1_w); 
     x=(CheckBox)findViewById(R.id.sec1_x); 
     y=(CheckBox)findViewById(R.id.sec1_y); 
     z=(CheckBox)findViewById(R.id.sec1_z); 
     one =(Button) findViewById(R.id.next); 

     one.setOnClickListener(new View.OnClickListener(){ 

      @Override 
      public void onClick(View view) { 
       if(view==one){ 
       if(TextUtils.isEmpty(name.getText().toString())) { 
        name.setError("Text field is empty"); 
        return; 
       } 
       if(TextUtils.isEmpty(add.getText().toString())) { 
        add.setError("Text field is empty"); 
        return; 
       } 
       if(TextUtils.isEmpty(vnum.getText().toString())) { 
        vnum.setError("Text field is empty"); 
        return; 
       } 
       if(TextUtils.isEmpty(lnum.getText().toString())) { 
        lnum.setError("Text field is empty"); 
        return; 
       } 
       StringBuilder violations= new StringBuilder(40); 
       violations.append("Sec1 "); 
       if(a.isChecked()){ 
        violations.append("a"); 
       } 
       if(b.isChecked()){ 
        violations.append(",b"); 
       } 
       if(c.isChecked()){ 
        violations.append(",c"); 
       } 
       if(d.isChecked()){ 
        violations.append(",d"); 
       } 
       if(e.isChecked()){ 
        violations.append(",e"); 
       } 
       if(f.isChecked()){ 
        violations.append(",f"); 
       } 
       if(g.isChecked()){ 
        violations.append(",g"); 
       } 
       if(h.isChecked()){ 
        violations.append(",h"); 
       } 
       if(i.isChecked()){ 
        violations.append(",i"); 
       } 
       if(j.isChecked()){ 
        violations.append(",j"); 
       } 
       if(k.isChecked()){ 
        violations.append(",k"); 
       } 
       if(l.isChecked()){ 
        violations.append(",l"); 
       } 
       if(m.isChecked()){ 
        violations.append(",m"); 
       } 
       if(n.isChecked()){ 
        violations.append(",n"); 
       } 
       if(o.isChecked()){ 
        violations.append(",o"); 
       } 
       if(p.isChecked()){ 
        violations.append(",p"); 
       } 
       if(q.isChecked()){ 
        violations.append(",q"); 
       } 
       if(r.isChecked()){ 
        violations.append(",r"); 
       } 
       if(t.isChecked()){ 
        violations.append(",t"); 
       } 
       if(u.isChecked()){ 
        violations.append(",u"); 
       } 
       if(v.isChecked()){ 
        violations.append(",v"); 
       } 
       if(w.isChecked()){ 
        violations.append(",w"); 
       } 
       if(x.isChecked()){ 
        violations.append(",x"); 
       } 
       if(y.isChecked()){ 
        violations.append(",y"); 
       } 
       if(z.isChecked()){ 
        violations.append(",z"); 
       } 
       Intent intent = new Intent(Violation.this, VerifyActivity.class); 
       intent.putExtra("fname", name.getText().toString()); 
       intent.putExtra("address", add.getText().toString()); 
       intent.putExtra("vnumber", vnum.getText().toString()); 
       intent.putExtra("violation", violations.toString()); 
       intent.putExtra("lnumber", lnum.getText().toString()); 
       startActivity(intent); 
       }} 
      }); 
    } 

    @SuppressWarnings("deprecation") 
    @Override 
    public Object onRetainNonConfigurationInstance() { 
     if (mAccessory != null) { 
      return mAccessory; 
     } else { 
      return super.onRetainNonConfigurationInstance(); 
     } 
    } 
    @Override 
    public void onResume() { 
     super.onResume(); 


     if (mInputStream != null && mOutputStream != null) { 
      //streams were not null"); 
      return; 
     } 
     //streams were null"); 
     UsbAccessory[] accessories = mUsbManager.getAccessoryList(); 
     UsbAccessory accessory = (accessories == null ? null : accessories[0]); 
     if (accessory != null) { 
      if (mUsbManager.hasPermission(accessory)) { 
       openAccessory(accessory); 
      } else { 
       synchronized (mUsbReceiver) { 
        if (!mPermissionRequestPending) { 
         mUsbManager.requestPermission(accessory, mPermissionIntent); 
         mPermissionRequestPending = true; 
        } 
       } 
      } 
     } else { 
      // null accessory 
     } 
    } 
    @Override 
    public void onPause() { 
     super.onPause(); 
    } 

    @Override 
    public void onDestroy() { 
     unregisterReceiver(mUsbReceiver); 
     super.onDestroy(); 
    } 

    Handler mHandler = new Handler() { 
     @Override 
     public void handleMessage(Message msg) { 
      ValueMsg t = (ValueMsg) msg.obj; 
      // this is where you handle the data you sent. You get it by calling the getReading() function 
      EditText editText = (EditText)findViewById(R.id.add); 
      editText.setText(""+t.getReading(), TextView.BufferType.EDITABLE); 
     } 
    }; 


    private void setupAccessory() { 
     UsbManager mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE); 
     mPermissionIntent =PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0); 
     IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION); 
     filter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED); 
     registerReceiver(mUsbReceiver, filter); 
     if (getLastNonConfigurationInstance() != null) { 
      mAccessory = (UsbAccessory) getLastNonConfigurationInstance(); 
      openAccessory(mAccessory); 
     } 
    } 
    private void openAccessory(UsbAccessory accessory) { 
     mFileDescriptor = mUsbManager.openAccessory(accessory); 
     if (mFileDescriptor != null) { 
      mAccessory = accessory; 
      FileDescriptor fd = mFileDescriptor.getFileDescriptor(); 
      mInputStream = new FileInputStream(fd); 
      mOutputStream = new FileOutputStream(fd); 
      Thread thread = new Thread(null, this, "OpenAccessoryTest"); 
      thread.start(); 
      //Accessory opened 
     } else { 
      // failed to open accessory 
     } 
    } 

    private void closeAccessory() { 
     try { 
      if (mFileDescriptor != null) { 
       mFileDescriptor.close(); 
      } 
     } catch (IOException e) { 
     } finally { 
      mFileDescriptor = null; 
      mAccessory = null; 
     } 
    } 
    public void run() { 
     int ret = 0; 
     byte[] buffer = new byte[16384]; 
     int i; 

     while (true) { // read data 
      try { 
       ret = mInputStream.read(buffer); 
      } catch (IOException e) { 
       break; 
      } 

      i = 0; 
      while (i < ret) { 
       int len = ret - i; 
       if (len >= 1) { 
        Message m = Message.obtain(mHandler); 
        int TagSerialNumber = (int)buffer[i]; 
        // 'f' is the flag, use for your own logic 
        // value is the value from the arduino 
        m.obj = new ValueMsg('f', TagSerialNumber); 
        mHandler.sendMessage(m); 
       } 
       i += 4; // number of bytes sent from arduino 
      } 

     } 
    } 
    private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      String action = intent.getAction(); 
      if (ACTION_USB_PERMISSION.equals(action)) { 
       synchronized (this) { 
        UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY); 
        if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) { 
         openAccessory(accessory); 
        } else { 
         // USB permission denied 
        } 
       } 
      } else if (UsbManager.ACTION_USB_ACCESSORY_DETACHED.equals(action)) { 
       UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY); 
       if (accessory != null && accessory.equals(mAccessory)) { 
        //accessory detached 
        closeAccessory(); 
       } 
      } 
     } 
    }; 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.violation, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 
} 

это код мой arduino

#include <SoftwareSerial.h> 
#include <MFRC522.h> // Include of the RC522 Library 
#include <SPI.h> // Used for communication via SPI with the Module 
#include <Usb.h> 
#include <AndroidAccessory.h> 

#define SDAPIN 53 // RFID Module SDA Pin is connected to the UNO 10 Pin 
#define RESETPIN 5 // RFID Module RST Pin is connected to the UNO 8 Pin 

AndroidAccessory acc("Manufacturer", 
     "Model", 
     "Description", 
     "1.0", 
     "http://yoursite.com", 
     "0000000"); 

byte FoundTag; // Variable used to check if Tag was found 
byte ReadTag; // Variable used to store anti-collision value to read Tag information 
byte TagData[MAX_LEN]; // Variable used to store Full Tag Data 
byte TagSerialNumber[5]; // Variable used to store only Tag Serial Number 
byte GoodTag1SerialNumber[5] = {0x7D, 0x60, 0x9B, 0xC}; // The Tag Serial number we are looking for 
byte GoodTag2SerialNumber[5] = {0x39, 0xC, 0x56, 0x84}; // The Tag Serial number we are looking for 

MFRC522 nfc(SDAPIN, RESETPIN); // Init of the library using the UNO pins declared above 

void setup() { 
    SPI.begin(); 
    Serial.begin(9600); 
    acc.powerOn(); 

// Start to find an RFID Module 
    Serial.println("Looking for RFID Reader"); 
    nfc.begin(); 
    byte version = nfc.getFirmwareVersion(); // Variable to store Firmware version of the Module 

// If can't find an RFID Module 
    if (! version) { 
    Serial.print("Didn't find RC522 board."); 
    while(1); //Wait until a RFID Module is found 
    } 

// If found, print the information about the RFID Module 
    Serial.print("Found chip RC522 "); 
    Serial.print("Firmware version: 0x"); 
    Serial.println(version, HEX); 
    Serial.println(); 
} 

void loop() { 

    String GoodTag1="False"; // Variable used to confirm good Tag Detected 
    String GoodTag2="False"; // Variable used to confirm good Tag Detected 

// Check to see if a Tag was detected 
// If yes, then the variable FoundTag will contain "MI_OK" 
    FoundTag = nfc.requestTag(MF1_REQIDL, TagData); 

    if (FoundTag == MI_OK) { 
    delay(200); 

// Get anti-collision value to properly read information from the Tag 
    ReadTag = nfc.antiCollision(TagData); 

    memcpy(TagSerialNumber, TagData, 4); // Write the Tag information in the TagSerialNumber variable 

    if (acc.isConnected()) 
    { 
    acc.write(TagSerialNumber, 4); 
    } 
    Serial.println("Tag detected."); 
    Serial.print("Serial Number: "); 
    for (int i = 0; i < 4; i++) { // Loop to print serial number to serial monitor 
     Serial.print(TagSerialNumber[i], HEX); 
     Serial.print(", "); 
    } 
    Serial.println(""); 
    Serial.println(); 

// Check if detected Tag has the right Serial number we are looking for 
    for(int i=0; i < 4; i++){ 
     if (GoodTag1SerialNumber[i] != TagSerialNumber[i]) { 
     break; // if not equal, then break out of the "for" loop 
     } 
     if (i == 3) { // if we made it to 4 loops then the Tag Serial numbers are matching 
     GoodTag1="TRUE"; 
     } 
    } 
    for(int i=0; i < 4; i++){ 
     if (GoodTag2SerialNumber[i] != TagSerialNumber[i]) { 
     break; // if not equal, then break out of the "for" loop 
     } 
     if (i == 3) { // if we made it to 4 loops then the Tag Serial numbers are matching 
     GoodTag2="TRUE"; 
     } 
    } 

    } 
} 

, пожалуйста, сообщите мне, что не так с моим кодом и что я должен изменить для его работы.
всякая помощь была бы благодарна

Answer 1

Вы никогда не создаете mUsbManager должным образом. Вместо инициализации переменной класса создается локальная переменная.

private void setupAccessory() { 
     UsbManager mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE); // <--- This should not be local! 
     // Your other code.... 
    }