java - ListView 未正确填充/不可见

Question

我有一个带有自定义列表适配器的 Activity 。如果填充 ListView 的数组列表为空，我会向用户显示一个文本框，否则文本框将变得不可见，并显示 ListView 。每当数组列表为空时，文本框都会出现，但是当它不是空时，我会得到一个空白屏幕。我不确定这是因为我的 ListView 不可见还是因为它没有正确填充。昨天这工作得很好，但从那以后我对类(class)做了很多改变，我不确定是哪一个导致了这个问题。在过去的几个小时里我一直在尝试遵循代码来解决这个问题，我注意到如果我在适配器的 getView() 方法中添加一个 log 调用，它不会显示，如果我将它添加到构造函数中，它会显示正常。我还确保适配器被调用并使用 log 在 if 语句中输入正确的条件。我希望你们中的一个人能够发现问题，而我却不能。

调用适配器的方法:

 private void PopulateLister(ArrayList<BetDisplayer> listwriterr) {
    Log.d("POPULATING", listwriterr.toString());
    if (listwriterr.isEmpty()) {
        TextView emptybet = (TextView) findViewById(R.id.nobetstxtbox);
       // emptybet.setText("None of your bets have been settled yet.");
        emptybet.setVisibility(View.VISIBLE);
        ListView listView = (ListView) findViewById(R.id.betslistviews);
        listView.setVisibility(View.GONE);
    }
    else if (listwriterr.size() > 0){
        TextView emptybet = (TextView) findViewById(R.id.nobetstxtbox);
        emptybet.setVisibility(View.GONE);
        ListView listView = (ListView) findViewById(R.id.betslistviews);
        listView.setVisibility(View.VISIBLE);
        if (listwriterr.get(0).getStatus().equals("open")){
            ArrayAdapter<BetDisplayer> adapter = new MyListAdapter1();
            listView.setAdapter(adapter);
        }
        else {
            ArrayAdapter<BetDisplayer> adapter = new MyListAdapter2();
            listView.setAdapter(adapter);
        }



    }
}

Activity 的 XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout23"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:orientation="vertical">
    <!-- Main ListView
         Always give id value as list(@android:id/list)
    -->
    <fragment
        android:id="@+id/fragment"
        android:name="com.example.albert.betterapp.menu"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:layout="@layout/fragment_menu" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:layout_gravity="center"
        android:orientation="horizontal"
        android:weightSum="100">

        <LinearLayout
            android:id="@+id/openbetslayout"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:layout_weight="49"
            android:tag=""
            android:background="@drawable/bettypeselector"
            android:clickable="true">

            <TextView
                android:id="@+id/openbetstxtview"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_gravity="center"
                android:clickable="false"
                android:gravity="center"
                android:text="Open Bets"
                android:textColor="#B4B5AE"
                android:textStyle="bold" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:background="@drawable/seperator">

        </LinearLayout>

        <LinearLayout
            android:id="@+id/closedbetslayout"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:layout_weight="49"
            android:tag=""
            android:background="@drawable/bettypeselector"
            android:clickable="true">

            <TextView
                android:id="@+id/settledbetstxtview"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_gravity="center"
                android:clickable="false"
                android:gravity="center"
                android:text="Settled Bets"
                android:textColor="#B4B5AE"
                android:textStyle="bold" />
        </LinearLayout>
    </LinearLayout>


    <android.support.v4.widget.SwipeRefreshLayout
        android:layout_width="fill_parent"
        android:id = "@+id/displayallbetsrefresh"
        android:layout_height="wrap_content">
        <TextView
        android:layout_width="fill_parent"
        android:layout_height="200dp"
        android:id="@+id/nobetstxtbox"
        android:text="You currently don't have any open bets saved."
        android:textStyle="bold"
        android:layout_gravity="center"
        android:gravity="center"
        android:visibility="gone"
        android:textSize="17sp"
        android:textColor="#067103"/>
        <ListView
            android:id="@+id/betslistviews"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@color/betcolor"></ListView>
    </android.support.v4.widget.SwipeRefreshLayout>


</LinearLayout>

适配器:

 private class MyListAdapter1 extends ArrayAdapter<BetDisplayer> {
    public MyListAdapter1() {
        super(DisplayAllBets.this, R.layout.activity_singletotalbet, openbetsarray);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Log.d("TESTING", "123123123");
        itemView = convertView;
        if (itemView == null) {
            itemView = getLayoutInflater().inflate(R.layout.activity_singletotalbet, parent, false);
        }
        Button v = (Button) itemView.findViewById(R.id.detailsbutton);
        BetDisplayer currentwriter = openbetsarray.get(position);
        Log.d("TESTING", currentwriter.getSelections());
        Log.d("TESTING2", currentwriter.getSelections());
        String selections = currentwriter.getSelections();
        int numberofselections = 0;

        for (int i = 0; i < selections.length(); i++) {
            if (selections.charAt(i) == '/') {
                numberofselections++;
            }
        }
        if (numberofselections == 1) {
            TextView descriptor = (TextView) itemView.findViewById(R.id.no);
            descriptor.setText("Single");
        } else if (numberofselections == 2) {
            TextView descriptor = (TextView) itemView.findViewById(R.id.no);
            descriptor.setText("Double");
        } else if (numberofselections == 3) {
            TextView descriptor = (TextView) itemView.findViewById(R.id.no);
            descriptor.setText("Treble");
        } else {
            TextView descriptor = (TextView) itemView.findViewById(R.id.no);
            descriptor.setText("Accumulator" + "(" + numberofselections + ")");
        }
        TextView status = (TextView) itemView.findViewById(R.id.status);
        status.setText(currentwriter.getStatus());
        Log.d("ERRORDEBUG", currentwriter.toString());
        if (status.getText().toString().equals("open")) {
            TextView winnings = (TextView) itemView.findViewById(R.id.winnings);
            winnings.setText("-");
            /*LinearLayout displaylayout = (LinearLayout) itemView.findViewById(R.id.displaylayout);
            displaylayout.setBackgroundColor(Color.parseColor("#FFFFFF"));
            Button b = (Button) itemView.findViewById(R.id.detailsbutton);
            b.setBackgroundResource(R.drawable.btnback);*/
        }
        else if (status.getText().toString().equals("lost")) {
            TextView winnings = (TextView) itemView.findViewById(R.id.winnings);
            winnings.setText("0");
            /*LinearLayout displaylayout = (LinearLayout) itemView.findViewById(R.id.displaylayout);
            Button b = (Button) itemView.findViewById(R.id.detailsbutton);
            b.setBackgroundResource(R.drawable.btnbacklost);
            displaylayout.setBackgroundResource(R.drawable.lost);*/
        }
        else {
            TextView winnings = (TextView) itemView.findViewById(R.id.winnings);
            winnings.setText(Integer.toString(currentwriter.getReturns()));
          /*  Button b = (Button) itemView.findViewById(R.id.detailsbutton);
            b.setBackgroundResource(R.drawable.btnback);
            LinearLayout displaylayout = (LinearLayout) itemView.findViewById(R.id.displaylayout);
            displaylayout.setBackgroundResource(R.drawable.won);*/
        }
        TextView winningss = (TextView) itemView.findViewById(R.id.winningss);
        winningss.setText(Integer.toString(currentwriter.getReturns()));
        TextView stakes = (TextView) itemView.findViewById(R.id.stakes);
        stakes.setText(Integer.toString(currentwriter.getStake()));
        TextView tokens = (TextView) itemView.findViewById(R.id.tokens);
        tokens.setText(currentwriter.getId().substring(0,10));
        TextView teams = (TextView) itemView.findViewById(R.id.teams);
        TextView finalteams = (TextView) itemView.findViewById(R.id.actteams);
        String userselectionssetter = currentwriter.getUserselections();
        String actteamssetter = currentwriter.getActualselections();
        teams.setText(userselectionssetter);
        finalteams.setText(actteamssetter);
        return itemView;


    }
}

Answer 1

您的 SwipeRefreshLayout 有 2 个 subview ，如果我没记错的话，这会导致显示问题。你应该有类似的东西:

<SwipeRefreshLayout>
    <FrameLayout>
        <ScrollView>
            <TextView/>
        </ScrollView>
        <ListView/>
    </FrameLayout>
</SwipeRefreshLayout>

这是显示列表或文本时拉动刷新工作的唯一方法，然后您还必须重写 canChildScrollUp()。祝你好运。

否则，将文本放在 SwipeRefreshLayout 之外，并将 ListView 作为其唯一子级，但是当显示文本时，将无法进行滑动刷新。