v2.0.10 : annotations @nullable added

Author: DantSu

escposprinter/src/main/java/com/dantsu/escposprinter/connection/bluetooth/BluetoothConnections.java

@@ -1,8 +1,11 @@
 package com.dantsu.escposprinter.connection.bluetooth;
 
+import android.annotation.SuppressLint;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 
+import androidx.annotation.Nullable;
+
 import java.util.Set;
 
 public class BluetoothConnections {
@@ -19,6 +22,8 @@ public BluetoothConnections() {
      * Get a list of bluetooth devices available.
      * @return Return an array of BluetoothConnection instance
      */
+    @SuppressLint("MissingPermission")
+    @Nullable
     public BluetoothConnection[] getList() {
         if (this.bluetoothAdapter == null) {
             return null;

escposprinter/src/main/java/com/dantsu/escposprinter/connection/bluetooth/BluetoothPrintersConnections.java

@@ -4,6 +4,8 @@
 import android.bluetooth.BluetoothClass;
 import android.bluetooth.BluetoothDevice;
 
+import androidx.annotation.Nullable;
+
 import com.dantsu.escposprinter.exceptions.EscPosConnectionException;
 
 public class BluetoothPrintersConnections extends BluetoothConnections {
@@ -13,6 +15,7 @@ public class BluetoothPrintersConnections extends BluetoothConnections {
      *
      * @return a EscPosPrinterCommands instance
      */
+    @Nullable
     public static BluetoothConnection selectFirstPaired() {
         BluetoothPrintersConnections printers = new BluetoothPrintersConnections();
         BluetoothConnection[] bluetoothPrinters = printers.getList();
@@ -36,6 +39,7 @@ public static BluetoothConnection selectFirstPaired() {
      * @return an array of EscPosPrinterCommands
      */
     @SuppressLint("MissingPermission")
+    @Nullable
     public BluetoothConnection[] getList() {
         BluetoothConnection[] bluetoothDevicesList = super.getList();
 

escposprinter/src/main/java/com/dantsu/escposprinter/connection/usb/UsbConnections.java

@@ -4,6 +4,8 @@
 import android.hardware.usb.UsbDevice;
 import android.hardware.usb.UsbManager;
 
+import androidx.annotation.Nullable;
+
 import java.util.Collection;
 
 public class UsbConnections {
@@ -22,6 +24,7 @@ public UsbConnections(Context context) {
      * Get a list of USB devices available.
      * @return Return an array of UsbConnection instance
      */
+    @Nullable
     public UsbConnection[] getList() {
         if (this.usbManager == null) {
             return null;

escposprinter/src/main/java/com/dantsu/escposprinter/connection/usb/UsbDeviceHelper.java

@@ -5,13 +5,16 @@
 import android.hardware.usb.UsbEndpoint;
 import android.hardware.usb.UsbInterface;
 
+import androidx.annotation.Nullable;
+
 public class UsbDeviceHelper {
     /**
      * Find the correct USB interface for printing
      *
      * @param usbDevice USB device
      * @return correct USB interface for printing, null if not found
      */
+    @Nullable
     static public UsbInterface findPrinterInterface(UsbDevice usbDevice) {
         if (usbDevice == null) {
             return null;
@@ -32,6 +35,7 @@ static public UsbInterface findPrinterInterface(UsbDevice usbDevice) {
      * @param usbInterface USB interface
      * @return Input endpoint or null if not found
      */
+    @Nullable
     static public UsbEndpoint findEndpointIn(UsbInterface usbInterface) {
         if (usbInterface != null) {
             int endpointsCount = usbInterface.getEndpointCount();

escposprinter/src/main/java/com/dantsu/escposprinter/connection/usb/UsbPrintersConnections.java

@@ -4,6 +4,8 @@
 import android.hardware.usb.UsbConstants;
 import android.hardware.usb.UsbDevice;
 
+import androidx.annotation.Nullable;
+
 import com.dantsu.escposprinter.exceptions.EscPosConnectionException;
 
 public class UsbPrintersConnections extends UsbConnections {
@@ -22,6 +24,7 @@ public UsbPrintersConnections(Context context) {
      *
      * @return a UsbConnection instance
      */
+    @Nullable
     public static UsbConnection selectFirstConnected(Context context) {
         UsbPrintersConnections printers = new UsbPrintersConnections(context);
         UsbConnection[] bluetoothPrinters = printers.getList();
@@ -39,6 +42,7 @@ public static UsbConnection selectFirstConnected(Context context) {
      *
      * @return an array of UsbConnection
      */
+    @Nullable
     public UsbConnection[] getList() {
         UsbConnection[] usbConnections = super.getList();