增加 读取user自动补长度

app/src/main/java/com/example/writeepc/WriteUserActivity.java

@@ -36,12 +36,15 @@ public class WriteUserActivity extends BaseActivity {
             Toast.makeText(this, "请输入要写入的数据", Toast.LENGTH_SHORT).show();
             return;
         }
+        int length = writeData.length();
+        String tag="";
         if (writeData.length() % 4 != 0) {
-            Toast.makeText(this, "请输入4字数据", Toast.LENGTH_SHORT).show();
-            return;
+            tag=String.format("%0" + (length % 4)*2 + "d", 0);
         }
-        Log.e("TAG", "writeUser:" + ASCIIUtil.str2Hex(writeData));
-        writeUserData(ASCIIUtil.str2Hex(writeData));
+        String s = ASCIIUtil.str2Hex(writeData)+tag;
+        Log.e("TAG", "writeUser:" + s);
+        Log.e("TAG", "writeUser:" + s.length());
+        writeUserData(s);
     }
 
     public void readUser(View view) {

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

@@ -63,10 +63,10 @@
                 android:text="写入数据:" />
 
             <EditText
-                android:id="@+id/epc_view"
                 android:layout_width="match_parent"
                 android:layout_height="55dp"
                 android:layout_gravity="center"
+                android:gravity="center"
                 android:text="@={data.writeUser}" />
         </LinearLayout>