修改课件部分逻辑

live_teaching/src/main/java/com/daya/live_teaching/widget/dialog/CoursewarePreviewDialog.java

@@ -50,6 +50,7 @@ public class CoursewarePreviewDialog extends Dialog implements View.OnClickListe
         setContentView(R.layout.dialog_courseware_preview_layout);
         mViewpager = findViewById(R.id.viewpager);
         mTvConfirm = findViewById(R.id.tv_confirm);
+        findViewById(R.id.iv_close).setOnClickListener(this);
         mTvConfirm.setOnClickListener(this);
         mAdapter = new BaseQuickAdapter<String, BaseViewHolder>(R.layout.item_courseware_preview_layout) {
             @Override
@@ -84,12 +85,16 @@ public class CoursewarePreviewDialog extends Dialog implements View.OnClickListe
     @Override
     public void onClick(View v) {
         int id = v.getId();
+        if (id == R.id.iv_close) {
+            dismiss();
+            return;
+        }
         if (id == R.id.tv_confirm) {
             if (mViewpager != null && selectData != null) {
                 int currentItem = mViewpager.getCurrentItem();
                 if (currentItem < mAdapter.getData().size()) {
                     String imgUrl = mAdapter.getData().get(currentItem);
-                    if(TextUtils.isEmpty(imgUrl)){
+                    if (TextUtils.isEmpty(imgUrl)) {
                         ToastUtil.getInstance().showShort("该课件暂无乐谱哦");
                         return;
                     }