update

app/src/main/java/com/miya/fastcashier/log/EmptyRecyclerView.java

-package com.miya.fastcashier.log;
-
-import android.content.Context;
-import android.util.AttributeSet;
-import android.view.View;
-
-import androidx.annotation.Nullable;
-import androidx.recyclerview.widget.RecyclerView;
-
-/**
- * 作者：Leon
- * 时间：2017/3/17 13:44
- */
-public class EmptyRecyclerView extends RecyclerView {
-    private View mEmptyView;
-
-    public EmptyRecyclerView(Context context) {
-        super(context);
-    }
-
-    public EmptyRecyclerView(Context context, @Nullable AttributeSet attrs) {
-        super(context, attrs);
-    }
-
-    public EmptyRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
-        super(context, attrs, defStyle);
-    }
-
-    /**
-     * 根据数据源判断是否显示空白view
-     */
-    private void checkIfEmpty() {
-        if (mEmptyView != null || getAdapter() != null) {
-            mEmptyView.setVisibility(getAdapter().getItemCount() > 0 ? GONE : VISIBLE);
-        }
-    }
-
-    public void setmEmptyView(View mEmptyView) {
-        this.mEmptyView = mEmptyView;
-        checkIfEmpty();
-    }
-
-    @Override
-    public void setAdapter(Adapter adapter) {
-        Adapter adapterOld = getAdapter();
-        if (adapterOld != null) {
-            adapterOld.unregisterAdapterDataObserver(observer);
-        }
-        super.setAdapter(adapter);
-        if (adapter != null) {
-            adapter.registerAdapterDataObserver(observer);
-        }
-    }
-
-    AdapterDataObserver observer = new AdapterDataObserver() {
-        @Override
-        public void onChanged() {
-            super.onChanged();
-            checkIfEmpty();
-        }
-    };
-}

app/src/main/java/com/miya/fastcashier/log/EmptyRecyclerView.kt

+package com.miya.fastcashier.log
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.View
+import androidx.recyclerview.widget.RecyclerView
+
+/**
+ * 作者：Leon
+ * 时间：2017/3/17 13:44
+ */
+class EmptyRecyclerView : RecyclerView {
+
+    private var mEmptyView: View? = null
+
+    constructor(context: Context?) : super(context!!) {}
+    constructor(context: Context?, attrs: AttributeSet?) : super(
+        context!!, attrs
+    ) {
+    }
+
+    constructor(context: Context?, attrs: AttributeSet?, defStyle: Int) : super(
+        context!!, attrs, defStyle
+    ) {
+    }
+
+    /**
+     * 根据数据源判断是否显示空白view
+     */
+    private fun checkIfEmpty() {
+        if (mEmptyView != null || adapter != null) {
+            mEmptyView!!.visibility =
+                if (adapter!!.itemCount > 0) GONE else VISIBLE
+        }
+    }
+
+    fun setmEmptyView(mEmptyView: View?) {
+        this.mEmptyView = mEmptyView
+        checkIfEmpty()
+    }
+
+    override fun setAdapter(adapter: Adapter<*>?) {
+        val adapterOld = getAdapter()
+        adapterOld?.unregisterAdapterDataObserver(observer)
+        super.setAdapter(adapter)
+        adapter?.registerAdapterDataObserver(observer)
+    }
+
+    var observer: AdapterDataObserver = object : AdapterDataObserver() {
+        override fun onChanged() {
+            super.onChanged()
+            checkIfEmpty()
+        }
+    }
+}
\ No newline at end of file

app/src/main/java/com/miya/fastcashier/service/PrintService.kt

@@ -16,7 +16,7 @@ import java.util.*
 
 object PrintService {
 
-    private var payServiceResponse: PayServiceResponse? = null;
+    private var payServiceResponse: PayServiceResponse? = null
 
     /**
      * 退款