IntDef Parity for better warnings

but no @Intdef for databits, stopbits as these are frequently used with numbers instead of constants
remove redundant modifiers

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.0'
+        classpath 'com.android.tools.build:gradle:4.1.1'
     }
 }
 

usbSerialExamples/src/main/java/com/hoho/android/usbserial/examples/TerminalFragment.java

@@ -226,7 +226,7 @@ public class TerminalFragment extends Fragment implements SerialInputOutputManag
 
         try {
             usbSerialPort.open(usbConnection);
-            usbSerialPort.setParameters(baudRate, 8, UsbSerialPort.STOPBITS_1, UsbSerialPort.PARITY_NONE);
+            usbSerialPort.setParameters(baudRate, 8, 1, UsbSerialPort.PARITY_NONE);
             if(withIoManager) {
                 usbIoManager = new SerialInputOutputManager(usbSerialPort, this);
                 Executors.newSingleThreadExecutor().submit(usbIoManager);

usbSerialForAndroid/build.gradle

@@ -22,8 +22,8 @@ android {
 }
 
 dependencies {
+    implementation "androidx.annotation:annotation:1.1.0"
     testImplementation 'junit:junit:4.13'
-    androidTestImplementation 'com.android.support:support-annotations:28.0.0'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'commons-net:commons-net:3.6'
     androidTestImplementation 'org.apache.commons:commons-lang3:3.11'

usbSerialForAndroid/src/androidTest/java/com/hoho/android/usbserial/util/TelnetWrapper.java

@@ -1,5 +1,7 @@
 package com.hoho.android.usbserial.util;
 
+import com.hoho.android.usbserial.driver.UsbSerialPort;
+
 import org.apache.commons.net.telnet.InvalidTelnetOptionException;
 import org.apache.commons.net.telnet.TelnetClient;
 import org.apache.commons.net.telnet.TelnetCommand;
@@ -140,7 +142,7 @@ public class TelnetWrapper {
         }
     }
 
-    public void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException, InterruptedException, InvalidTelnetOptionException {
+    public void setParameters(int baudRate, int dataBits, int stopBits, @UsbSerialPort.Parity int parity) throws IOException, InterruptedException, InvalidTelnetOptionException {
         doCommand("set-baudrate", new byte[] {RFC2217_COM_PORT_OPTION, RFC2217_SET_BAUDRATE, (byte)(baudRate>>24), (byte)(baudRate>>16), (byte)(baudRate>>8), (byte)baudRate});
         doCommand("set-datasize", new byte[] {RFC2217_COM_PORT_OPTION, RFC2217_SET_DATASIZE, (byte)dataBits});
         doCommand("set-stopsize", new byte[] {RFC2217_COM_PORT_OPTION, RFC2217_SET_STOPSIZE, (byte)stopBits});

usbSerialForAndroid/src/androidTest/java/com/hoho/android/usbserial/util/UsbWrapper.java

@@ -226,7 +226,7 @@ public class UsbWrapper implements SerialInputOutputManager.Listener {
         serialPort.write(data, USB_WRITE_WAIT);
     }
 
-    public void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException, InterruptedException {
+    public void setParameters(int baudRate, int dataBits, int stopBits, @UsbSerialPort.Parity int parity) throws IOException, InterruptedException {
         serialPort.setParameters(baudRate, dataBits, stopBits, parity);
         if(serialDriver instanceof CdcAcmSerialDriver)
             Thread.sleep(10); // arduino_leonardeo_bridge.ini needs some time

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/CdcAcmSerialDriver.java

@@ -204,7 +204,7 @@ public class CdcAcmSerialDriver implements UsbSerialDriver {
         }
 
         @Override
-        public void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException {
+        public void setParameters(int baudRate, int dataBits, int stopBits, @Parity int parity) throws IOException {
             if(baudRate <= 0) {
                 throw new IllegalArgumentException("Invalid baud rate: " + baudRate);
             }

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Ch34xSerialDriver.java

@@ -220,7 +220,7 @@ public class Ch34xSerialDriver implements UsbSerialDriver {
 		}
 
 		@Override
-		public void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException {
+		public void setParameters(int baudRate, int dataBits, int stopBits, @Parity int parity) throws IOException {
 			if(baudRate <= 0) {
 				throw new IllegalArgumentException("Invalid baud rate: " + baudRate);
 			}

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/CommonUsbSerialPort.java

@@ -229,7 +229,7 @@ public abstract class CommonUsbSerialPort implements UsbSerialPort {
     }
 
     @Override
-    public abstract void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException;
+    public abstract void setParameters(int baudRate, int dataBits, int stopBits, @Parity int parity) throws IOException;
 
     @Override
     public boolean getCD() throws IOException { throw new UnsupportedOperationException(); }

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Cp21xxSerialDriver.java

@@ -175,7 +175,7 @@ public class Cp21xxSerialDriver implements UsbSerialDriver {
         }
 
         @Override
-        public void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException {
+        public void setParameters(int baudRate, int dataBits, int stopBits, @Parity int parity) throws IOException {
             if(baudRate <= 0) {
                 throw new IllegalArgumentException("Invalid baud rate: " + baudRate);
             }

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/FtdiSerialDriver.java

@@ -226,7 +226,7 @@ public class FtdiSerialDriver implements UsbSerialDriver {
         }
 
         @Override
-        public void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException {
+        public void setParameters(int baudRate, int dataBits, int stopBits, @Parity int parity) throws IOException {
             if(baudRate <= 0) {
                 throw new IllegalArgumentException("Invalid baud rate: " + baudRate);
             }

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/ProlificSerialDriver.java

@@ -349,7 +349,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
         }
 
         @Override
-        public void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException {
+        public void setParameters(int baudRate, int dataBits, int stopBits, @Parity int parity) throws IOException {
             baudRate = filterBaudRate(baudRate);
             if ((mBaudRate == baudRate) && (mDataBits == dataBits)
                     && (mStopBits == stopBits) && (mParity == parity)) {

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/UsbSerialDriver.java

@@ -21,7 +21,7 @@ public interface UsbSerialDriver {
      *
      * @return the device
      */
-    public UsbDevice getDevice();
+    UsbDevice getDevice();
 
     /**
      * Returns all available ports for this device. This list must have at least
@@ -29,5 +29,5 @@ public interface UsbSerialDriver {
      *
      * @return the ports
      */
-    public List<UsbSerialPort> getPorts();
+    List<UsbSerialPort> getPorts();
 }

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/UsbSerialPort.java

@@ -10,8 +10,12 @@ import android.hardware.usb.UsbDevice;
 import android.hardware.usb.UsbDeviceConnection;
 import android.hardware.usb.UsbManager;
 
+import androidx.annotation.IntDef;
+
 import java.io.Closeable;
 import java.io.IOException;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
 import java.util.EnumSet;
 
 /**
@@ -22,73 +26,53 @@ import java.util.EnumSet;
 public interface UsbSerialPort extends Closeable {
 
     /** 5 data bits. */
-    public static final int DATABITS_5 = 5;
+    int DATABITS_5 = 5;
-
     /** 6 data bits. */
-    public static final int DATABITS_6 = 6;
+    int DATABITS_6 = 6;
-
     /** 7 data bits. */
-    public static final int DATABITS_7 = 7;
+    int DATABITS_7 = 7;
-
     /** 8 data bits. */
-    public static final int DATABITS_8 = 8;
+    int DATABITS_8 = 8;
-
-    /** No flow control. */
-    public static final int FLOWCONTROL_NONE = 0;
-
-    /** RTS/CTS input flow control. */
-    public static final int FLOWCONTROL_RTSCTS_IN = 1;
-
-    /** RTS/CTS output flow control. */
-    public static final int FLOWCONTROL_RTSCTS_OUT = 2;
-
-    /** XON/XOFF input flow control. */
-    public static final int FLOWCONTROL_XONXOFF_IN = 4;
-
-    /** XON/XOFF output flow control. */
-    public static final int FLOWCONTROL_XONXOFF_OUT = 8;
 
+    /** Values for setParameters(..., parity) */
+    @Retention(RetentionPolicy.SOURCE)
+    @IntDef({PARITY_NONE, PARITY_ODD, PARITY_EVEN, PARITY_MARK, PARITY_SPACE})
+    @interface Parity {}
     /** No parity. */
-    public static final int PARITY_NONE = 0;
+    int PARITY_NONE = 0;
-
     /** Odd parity. */
-    public static final int PARITY_ODD = 1;
+    int PARITY_ODD = 1;
-
     /** Even parity. */
-    public static final int PARITY_EVEN = 2;
+    int PARITY_EVEN = 2;
-
     /** Mark parity. */
-    public static final int PARITY_MARK = 3;
+    int PARITY_MARK = 3;
-
     /** Space parity. */
-    public static final int PARITY_SPACE = 4;
+    int PARITY_SPACE = 4;
 
     /** 1 stop bit. */
-    public static final int STOPBITS_1 = 1;
+    int STOPBITS_1 = 1;
-
     /** 1.5 stop bits. */
-    public static final int STOPBITS_1_5 = 3;
+    int STOPBITS_1_5 = 3;
-
     /** 2 stop bits. */
-    public static final int STOPBITS_2 = 2;
+    int STOPBITS_2 = 2;
 
-    /** values for get[Supported]ControlLines() */
+    /** Values for get[Supported]ControlLines() */
-    public enum ControlLine { RTS, CTS,  DTR, DSR,  CD, RI };
+    enum ControlLine { RTS, CTS,  DTR, DSR,  CD, RI }
 
     /**
      * Returns the driver used by this port.
      */
-    public UsbSerialDriver getDriver();
+    UsbSerialDriver getDriver();
 
     /**
      * Returns the currently-bound USB device.
      */
-    public UsbDevice getDevice();
+    UsbDevice getDevice();
 
     /**
      * Port number within driver.
      */
-    public int getPortNumber();
+    int getPortNumber();
 
     /**
      * The serial number of the underlying UsbDeviceConnection, or {@code null}.
@@ -96,7 +80,7 @@ public interface UsbSerialPort extends Closeable {
      * @return value from {@link UsbDeviceConnection#getSerial()}
      * @throws SecurityException starting with target SDK 29 (Android 10) if permission for USB device is not granted
      */
-    public String getSerial();
+    String getSerial();
 
     /**
      * Opens and initializes the port. Upon success, caller must ensure that
@@ -106,14 +90,14 @@ public interface UsbSerialPort extends Closeable {
      *                   {@link UsbManager#openDevice(android.hardware.usb.UsbDevice)}
      * @throws IOException on error opening or initializing the port.
      */
-    public void open(UsbDeviceConnection connection) throws IOException;
+    void open(UsbDeviceConnection connection) throws IOException;
 
     /**
      * Closes the port and {@link UsbDeviceConnection}
      *
      * @throws IOException on error closing the port.
      */
-    public void close() throws IOException;
+    void close() throws IOException;
 
     /**
      * Reads as many bytes as possible into the destination buffer.
@@ -123,7 +107,7 @@ public interface UsbSerialPort extends Closeable {
      * @return the actual number of bytes read
      * @throws IOException if an error occurred during reading
      */
-    public int read(final byte[] dest, final int timeout) throws IOException;
+    int read(final byte[] dest, final int timeout) throws IOException;
 
     /**
      * Writes as many bytes as possible from the source buffer.
@@ -133,7 +117,7 @@ public interface UsbSerialPort extends Closeable {
      * @return the actual number of bytes written
      * @throws IOException if an error occurred during writing
      */
-    public int write(final byte[] src, final int timeout) throws IOException;
+    int write(final byte[] src, final int timeout) throws IOException;
 
     /**
      * Sets various serial port parameters.
@@ -147,7 +131,7 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException on error setting the port parameters
      * @throws UnsupportedOperationException if values are not supported by a specific device
      */
-    public void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException;
+    void setParameters(int baudRate, int dataBits, int stopBits, @Parity int parity) throws IOException;
 
     /**
      * Gets the CD (Carrier Detect) bit from the underlying UART.
@@ -156,7 +140,7 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException if an error occurred during reading
      * @throws UnsupportedOperationException if not supported
      */
-    public boolean getCD() throws IOException;
+    boolean getCD() throws IOException;
 
     /**
      * Gets the CTS (Clear To Send) bit from the underlying UART.
@@ -165,7 +149,7 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException if an error occurred during reading
      * @throws UnsupportedOperationException if not supported
      */
-    public boolean getCTS() throws IOException;
+    boolean getCTS() throws IOException;
 
     /**
      * Gets the DSR (Data Set Ready) bit from the underlying UART.
@@ -174,7 +158,7 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException if an error occurred during reading
      * @throws UnsupportedOperationException if not supported
      */
-    public boolean getDSR() throws IOException;
+    boolean getDSR() throws IOException;
 
     /**
      * Gets the DTR (Data Terminal Ready) bit from the underlying UART.
@@ -183,7 +167,7 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException if an error occurred during reading
      * @throws UnsupportedOperationException if not supported
      */
-    public boolean getDTR() throws IOException;
+    boolean getDTR() throws IOException;
 
     /**
      * Sets the DTR (Data Terminal Ready) bit on the underlying UART, if supported.
@@ -192,7 +176,7 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException if an error occurred during writing
      * @throws UnsupportedOperationException if not supported
      */
-    public void setDTR(boolean value) throws IOException;
+    void setDTR(boolean value) throws IOException;
 
     /**
      * Gets the RI (Ring Indicator) bit from the underlying UART.
@@ -201,7 +185,7 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException if an error occurred during reading
      * @throws UnsupportedOperationException if not supported
      */
-    public boolean getRI() throws IOException;
+    boolean getRI() throws IOException;
 
     /**
      * Gets the RTS (Request To Send) bit from the underlying UART.
@@ -210,7 +194,7 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException if an error occurred during reading
      * @throws UnsupportedOperationException if not supported
      */
-    public boolean getRTS() throws IOException;
+    boolean getRTS() throws IOException;
 
     /**
      * Sets the RTS (Request To Send) bit on the underlying UART, if supported.
@@ -219,7 +203,7 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException if an error occurred during writing
      * @throws UnsupportedOperationException if not supported
      */
-    public void setRTS(boolean value) throws IOException;
+    void setRTS(boolean value) throws IOException;
 
     /**
      * Gets all control line values from the underlying UART, if supported.
@@ -228,7 +212,7 @@ public interface UsbSerialPort extends Closeable {
      * @return EnumSet.contains(...) is {@code true} if set, else {@code false}
      * @throws IOException if an error occurred during reading
      */
-    public EnumSet<ControlLine> getControlLines() throws IOException;
+    EnumSet<ControlLine> getControlLines() throws IOException;
 
     /**
      * Gets all control line supported flags.
@@ -236,7 +220,7 @@ public interface UsbSerialPort extends Closeable {
      * @return EnumSet.contains(...) is {@code true} if supported, else {@code false}
      * @throws IOException if an error occurred during reading
      */
-    public EnumSet<ControlLine> getSupportedControlLines() throws IOException;
+    EnumSet<ControlLine> getSupportedControlLines() throws IOException;
 
     /**
      * Purge non-transmitted output data and / or non-read input data.
@@ -246,18 +230,18 @@ public interface UsbSerialPort extends Closeable {
      * @throws IOException if an error occurred during flush
      * @throws UnsupportedOperationException if not supported
      */
-    public void purgeHwBuffers(boolean purgeWriteBuffers, boolean purgeReadBuffers) throws IOException;
+    void purgeHwBuffers(boolean purgeWriteBuffers, boolean purgeReadBuffers) throws IOException;
 
     /**
      * send BREAK condition.
      *
      * @param value set/reset
      */
-    public void setBreak(boolean value) throws IOException;
+    void setBreak(boolean value) throws IOException;
 
     /**
      * Returns the current state of the connection.
      */
-    public boolean isOpen();
+    boolean isOpen();
 
 }