Question

抱歉我的英语不好。我现在的目的是在Snackbar中显示一个editText和gridView文本。当用户单击FAB时，此Snackbar会显示，而不是可以在editText中编写内容。之后，用户应该单击gridView中显示的GridViewAdapter生成的一些文本。我的代码成功显示了editView和一些静态按钮the code，但它无法查看gridView。这是我的最后一段代码，请帮我找到解决方案

    //grid view properties
GridView gridView;
List<String> ItemsList;
String selectedItem;
TextView GridViewItems,BackSelectedItem;
int backposition = -1;
String[] itemsName = new String[]{
        "Fisika",
        "Kimia",
        "Biologi",
        "Matematika",
};
    private void setupUI() {
    btnFab = (FloatingActionButton) findViewById(R.id.btnFloatingAction);
    btnFab.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            CoordinatorLayout linearLayout = (CoordinatorLayout)findViewById(R.id.coordinatorLayout);

            final Snackbar snackbar = Snackbar.make(linearLayout, "", Snackbar.LENGTH_INDEFINITE);
            Snackbar.SnackbarLayout layout = (Snackbar.SnackbarLayout) snackbar.getView();

            // Inflate your custom view with an Edit Text
            LayoutInflater objLayoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            final View snackView = objLayoutInflater.inflate(R.layout.custom_snac_layout, null);
            // custom_snac_layout is your custom xml

            final EditText txt_event = (EditText) snackView.findViewById(R.id.event_text);
            gridView = (GridView)findViewById(R.id.grid_view);

            ItemsList = new ArrayList<String>(Arrays.asList(itemsName));

            gridView.setAdapter(new GridViewAdapter(ParentActivity.this));

            gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                                        int position, long id) {
                    // TODO Auto-generated method stub

                    selectedItem = parent.getItemAtPosition(position).toString();

                    GridViewItems = (TextView) view;

                    GridViewItems.setBackgroundColor(Color.parseColor("#814f00"));

                    GridViewItems.setTextColor(Color.parseColor("#fdfcfa"));

                    BackSelectedItem = (TextView) gridView.getChildAt(backposition);

                    if (backposition != -1)
                    {

                        BackSelectedItem.setSelected(false);

                        BackSelectedItem.setBackgroundColor(Color.parseColor("#fbdcbb"));

                        BackSelectedItem.setTextColor(Color.parseColor("#040404"));
                    }

                    backposition = position;

                    String event =  txt_event.getText().toString();
                    Toast.makeText(ParentActivity.this, "Item selected "+ selectedItem +"Text "+event, Toast.LENGTH_LONG).show();

                }
            });

            layout.addView(snackView, 0);
            snackbar.show();

        }
    });

}
public class GridViewAdapter extends BaseAdapter {
    Context context;

    public GridViewAdapter(Context context)
    {
        this.context = context;
    }

    @Override
    public int getCount() {

        return itemsName.length;
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub

        return itemsName[position];
    }

    @Override
    public long getItemId(int position) {

        // TODO Auto-generated method stub

        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        TextView text = new TextView(this.context);

        text.setText(itemsName[position]);

        text.setGravity(Gravity.CENTER);

        text.setBackgroundColor(Color.parseColor("#fbdcbb"));

        text.setTextColor(Color.parseColor("#040404"));

        text.setLayoutParams(new GridView.LayoutParams(144, 144));

        return text;

    }

}

这里是我的custom_snac_layout.xml代码

    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
    android:layout_marginTop="8dp"
    android:layout_marginBottom="8dp"
    android:layout_alignParentTop="true"
    android:id="@+id/event_text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:scrollHorizontally="false"
    android:hint="@string/type_your_message"
    android:inputType="textNoSuggestions"
    android:maxLines="4"
    android:singleLine="false"
    android:textSize="18sp"
    android:paddingLeft="4dp" />

<GridView
    android:id="@+id/grid_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/event_text"
    android:layout_centerHorizontal="true"
    android:numColumns="3"/>

这些代码报告＆＃34; NullPointerException＆＃34;在logcat上

Answer 1

试试这个，

   gridView = (GridView)snackView.findViewById(R.id.grid_view);

如何显示和获取选择gridView在LayoutInflater上使用适配器

1 个答案: