修改英泰机器是否在线状态检测方法；

英泰机器添加beginPrint方法内触发式检测是否已连接

.idea/misc.xml

@@ -5,7 +5,42 @@
       <configuration PROFILE_NAME="Debug" CONFIG_NAME="Debug" />
     </configurations>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="NullableNotNullManager">
+    <option name="myDefaultNullable" value="android.support.annotation.Nullable" />
+    <option name="myDefaultNotNull" value="android.support.annotation.NonNull" />
+    <option name="myNullables">
+      <value>
+        <list size="10">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
+          <item index="2" class="java.lang.String" itemvalue="javax.annotation.CheckForNull" />
+          <item index="3" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
+          <item index="4" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
+          <item index="5" class="java.lang.String" itemvalue="androidx.annotation.Nullable" />
+          <item index="6" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNullable" />
+          <item index="7" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.qual.Nullable" />
+          <item index="8" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NullableDecl" />
+          <item index="9" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NullableType" />
+        </list>
+      </value>
+    </option>
+    <option name="myNotNulls">
+      <value>
+        <list size="9">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
+          <item index="4" class="java.lang.String" itemvalue="androidx.annotation.NonNull" />
+          <item index="5" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNonNull" />
+          <item index="6" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.qual.NonNull" />
+          <item index="7" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NonNullDecl" />
+          <item index="8" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NonNullType" />
+        </list>
+      </value>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

app/src/main/res/layout/activity_print.xml

@@ -79,7 +79,7 @@
                         android:id="@+id/btnPrintText"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
-                        android:text="打印默认字符" />
+                        android:text="打印输入字符" />
                 </TableRow>
 
                 <TableRow android:visibility="gone">

print/src/main/AndroidManifest.xml

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.miya.print" />
+    package="com.miya.print">
+
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+</manifest>

print/src/main/java/com/miya/print/YingtaiPrinter.java

@@ -30,7 +30,7 @@ public class YingtaiPrinter extends BasePrinter {
         this.context = context;
         mPrinter = PrinterAPI.getInstance();
         io = new USBAPI(context);
-        if (!io.isOpen().booleanValue()) {
+        if (!mPrinter.isConnect()) {
             if (PrinterAPI.SUCCESS == mPrinter.connect(io)) {
                 PrintLogger.i(TAG, "英泰打印机连接成功");
                 return true;
@@ -54,11 +54,29 @@ public class YingtaiPrinter extends BasePrinter {
         return true;
     }
 
+    @Override
+    public int beginPrint() {
+        if (mPrinter != null && !mPrinter.isConnect()) {
+            if (PrinterAPI.SUCCESS == mPrinter.connect(io)) {
+                PrintLogger.i(TAG, "之前的连接断掉了，重新连接后，英泰打印机连接成功");
+                return PrinterStatusEnum.CODE_SUCCESS.status;
+            } else {
+                PrintLogger.e(TAG, "之前的连接断掉了，重新连接后，英泰打印机连接失败");
+                throw new PrinterException(PrinterStatusEnum.CODE_FAILED.status, "重连尝试，英泰打印机连接失败，请重试");
+            }
+        }
+        return PrinterStatusEnum.CODE_SUCCESS.status;
+    }
+
     @Override
     public int printText(int align, int size, String content, boolean isFeed) {
         if (mPrinter != null) {
             int ret = setAlign(align);
             try {
+                //设置字体大小,可传0～7
+                if (size >= 0 && size <= 7) {
+                    ret = mPrinter.setCharSize(size, size);
+                }
                 ret = mPrinter.printString(content, "GBK", isFeed);
                 return ret;
             } catch (UnsupportedEncodingException e) {