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我有一個xml文件，其中包含ImageView和TextView的可見性「消失」。 下面是我的XML文件，它的名字是video_fragment.xmlsetVisibility不能在片段中工作
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment_coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/white">
</android.support.v7.widget.RecyclerView>
<ImageView
android:id="@+id/emotion_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/emotion"
android:layout_centerHorizontal="true"
android:layout_marginTop="125dp"
android:visibility="gone"/>
<TextView
android:id="@+id/emotion_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="2dp"
android:text="@string/video_not_available"
android:textColor="@color/black_color"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:visibility="gone"/>
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
我片段使用此佈局。在片段，當我使Imageview和TextView通過setVisibility方法可見。它不可見。 這裏是我的片段類
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.video_fragment, container, false);
emotionImage = (ImageView)view.findViewById(R.id.emotion_image);
emotionText = (TextView)view.findViewById(R.id.emotion_text);
final String url = Constant.SUB_CAT_URL+categoryId;
coordinatorLayout = (CoordinatorLayout) view. findViewById(R.id.fragment_coordinatorLayout);
recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
getSubCategoryItem(url);
return view;
}
public void getSubCategoryItem(String url){
ConnectivityManager cm = (ConnectivityManager)getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo nf = cm.getActiveNetworkInfo();
isConnected = nf != null && nf.isConnectedOrConnecting();
if(isConnected) {
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
String message = response.optString(MESSAGE);
if (message.equals("Success")) {
JSONArray rootJsonArray = response.optJSONArray(DATA);
for (int i = 0; i < rootJsonArray.length(); i++) {
videoDetails = new ArrayList<>();
JSONObject childJsonObject = rootJsonArray.optJSONObject(i);
String subCategoryName = childJsonObject.optString(SUB_CATEGORY_NAME);
JSONArray childJsonArray = childJsonObject.optJSONArray(VIDEO_DETAILS);
try {
if (!childJsonArray.equals(null)) {
for (int j = 0; j < childJsonArray.length(); j++) {
JSONObject jsonObject = childJsonArray.optJSONObject(j);
String videoId = jsonObject.optString(VIDEO_ID);
String videoTitle = jsonObject.optString(VIDEO_TITLE);
String videoDes = jsonObject.optString(VIDEO_DESCRIPTION);
String videoDuration = jsonObject.optString(VIDEO_DURATION);
videoDetailsModel = new VideoDetailsModel(videoId, videoTitle, videoDes, videoDuration);
if (subCategoryName.equals("None")) {
nonSubCagegoryList.add(videoDetailsModel);
} else {
videoDetails.add(videoDetailsModel);
}
}
} else {
pdialog.dismiss();
emotionImage.setVisibility(View.VISIBLE);
emotionText.setVisibility(View.VISIBLE);
}
} catch (NullPointerException e) {
e.printStackTrace();
}
if (!subCategoryName.equals("None")) {
dashBoardModel = new DashBoardModel(subCategoryName, videoDetails);
dashBoard.add(dashBoardModel);
adapterContent.add(dashBoard);
subCategoryList.put(subCategoryName, videoDetails);
new SubCategoryModel(subCategoryList);
}
}
DashBoardRecyclerAdapter adapter = new DashBoardRecyclerAdapter(getActivity(), nonSubCagegoryList, adapterContent, categoryId);
recyclerView.setAdapter(adapter);
pdialog.dismiss();
} else {
pdialog.dismiss();
emotionImage.setVisibility(View.VISIBLE);
emotionText.setVisibility(View.VISIBLE);
}
} catch (Exception e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error instanceof TimeoutError || error instanceof NoConnectionError) {
pdialog.dismiss();
new ShowSnackBar(coordinatorLayout, getResources().getString(R.string.server_not_response));
}
}
}
);
jsonObjectRequest.setRetryPolicy(new DefaultRetryPolicy(20000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
requestQueue.add(jsonObjectRequest);
}else {
pdialog.dismiss();
new ShowSnackBar(coordinatorLayout,getResources().getString(R.string.check_internet));
}
}
當調試程序，debuger去別的部分，但在那之後我的看法是不visbile