Question

我正在用户可以选择的应用上创建“频道”列表。我希望它们在网格视图中，（有点像可点击的瓷砖）。在此片段上应该有两个单独的网格 - 默认频道（channelListSupplied）以及用户必须请求订阅（channelListEarned）的网格。

我使用了一个自定义适配器，我从另一个答案得到了SO，但我不能让它工作，因为它在片段中而不是在Activity中，我确定有一些参考我不是正确传递。

下面列出了Java和XML的相关部分......

FragmentChannels.java :(片段到MainActivity.java）

public class FragmentChannels extends Fragment implements FragmentManager.OnBackStackChangedListener {

    ViewGroup container;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        ...

        final JSONObject channelList = data.getJSONObject("channels");
        final JSONArray channelListSupplied = channelList.getJSONArray("supplied");
        final JSONArray channelListEarned = channelList.getJSONArray("earned");


        GridView channelViewSupplied = (GridView) view.findViewById(R.id.channel_grid_supplied);
        GridView channelViewEarned = (GridView) view.findViewById(R.id.channel_grid_earned);

        if (Session.getSessionVar("canHasSpecial").equals("1")) {
            FragmentChannels.this.createGridView(channelViewEarned, channelListEarned, FragmentChannels.this.container);
        }

        FragmentChannels.this.createGridView(channelViewSupplied, channelListSupplied, FragmentChannels.this.container);
        ...

        return view;
    }

    public void createGridView(final GridView gridView, JSONArray list, final ViewGroup container) throws JSONException {

        final String[] gridList = new String[list.length()];
        final Activity activity = getActivity();

        for (int i = 0; i < list.length(); i++) {
            JSONObject channelData = (JSONObject) list.get(i);
            gridList[i] = channelData.getString("source_name");
        }

        activity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                gridView.setAdapter(new GridViewAdapter(activity, gridList, container));
            }
        });
    }


    public boolean createChannelMenu(Menu menu) {
        MenuInflater inflater  = this.getActivity().getMenuInflater();
        inflater.inflate(R.menu.menu_channels, menu);
        super.onCreateOptionsMenu(menu, inflater);
        return true;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        final Activity activity = getActivity();

    }

    @Override
    public void onBackStackChanged() {

    }

}

GridViewAdapter.java：

public class GridViewAdapter extends BaseAdapter {

    private Context context;
    private final String[] textViewValues;
    private ViewGroup container;

    public GridViewAdapter(Context context, String[] textViewValues, ViewGroup container) {

        this.context = context;
        this.textViewValues = textViewValues;
        this.container = container;
    }

    @Override
    public int getCount() {
        return this.textViewValues.length;
    }

    @Override
    public Object getItem(int position) {
        return textViewValues[position];
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Log.d("CDFF", position+": "+this.textViewValues[position]);
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View gridView;

        if (convertView == null) {

            gridView = inflater.inflate(R.layout.grid_item_layout, this.container);

            TextView titleView = (TextView) gridView.findViewById(R.id.grid_item_title);
            titleView.setText(textViewValues[position]);
        }

        else {
            gridView = convertView;
        }

        return gridView;
    }
}

fragment_channels.xml：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:name="FragmentChannels"
    android:id="@+id/fragment_channel_container"
    tools:context="xx.xxx.xxxx.FragmentChannels"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingTop="10dp"
            android:paddingBottom="10dp"
            android:text="My Channels"
            android:background="@color/peach"
            android:textSize="20sp"
            android:textColor="@color/midnightBlue"
            android:gravity="center"
            android:textAppearance="@style/TextAppearance.FontPath"
            />

        <GridView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/channel_grid_earned"
            android:layout_margin="5dp"
            android:columnWidth="180dp"
            android:drawSelectorOnTop="true"
            android:gravity="center"
            android:numColumns="auto_fit"
            android:stretchMode="spacingWidthUniform"
            android:verticalSpacing="5dp"
            android:focusable="true"
            android:clickable="true"/>

        <GridView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/channel_grid_supplied"
            android:layout_margin="5dp"
            android:columnWidth="180dp"
            android:drawSelectorOnTop="true"
            android:gravity="center"
            android:numColumns="auto_fit"
            android:stretchMode="spacingWidthUniform"
            android:verticalSpacing="5dp"
            android:focusable="true"
            android:clickable="true"/>

    </LinearLayout>
</FrameLayout>

grid_item_layout.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="5dp"
    android:background="@color/white"
    android:orientation="vertical"
    android:padding="5dp">

    <ImageView
        android:id="@+id/grid_item_image"
        android:layout_width="150dp"
        android:layout_height="100dp"
        android:scaleType="centerCrop"/>

    <TextView
        android:id="@+id/grid_item_title"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="5dp"
        android:gravity="center"
        android:maxLines="2"
        android:ellipsize="marquee"
        android:textSize="12sp" />
</RelativeLayout>

截至目前，除了“我的频道”TextView之外，片段上没有任何内容显示。

我非常感谢任何帮助！

Answer 1

固定。

我换了一行：

gridView = inflater.inflate(R.layout.grid_item_layout, this.container);

要：

gridView = inflater.inflate(R.layout.grid_item_layout, null);

在GridViewAdapter.java班。

自定义GridView适配器无法显示

1 个答案: