android - 如何更改 android 中下拉 View 的标题？

Question

我的布局中有一个微调器并使用 android:prompt="@string/year" 设置提示。

默认提示如下:

现在我的问题是:

1. 如何将默认图标更改为其他图片？
2. 如何让“年”文字居中显示为红色？
3. 如何将背景颜色更改为黄色(存在“年”文字和图标的背景)？

我的自定义适配器类

private class MyCustomSpinnerAdapter extends ArrayAdapter<ArrayList> {
        private ArrayList<String> objectsList = new ArrayList<String>();

        @SuppressWarnings("unchecked")
        public MyCustomSpinnerAdapter(Context context, int textViewResourceId,
                ArrayList objects) {
            super(context, textViewResourceId, objects);
            this.objectsList = objects;
        }

        @Override
        public View getDropDownView(int position, View convertView,
                ViewGroup parent) {
            return getCustomView(position, convertView, parent);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            return getCustomView1(position, convertView, parent);
        }

        public View getCustomView(int position, View convertView,
                ViewGroup parent) {
            LayoutInflater inflater = getLayoutInflater();
            View rowView = inflater.inflate(R.layout.spinner_dropdown, parent,
                    false);
            LinearLayout rowTitle = (LinearLayout) rowView
                    .findViewById(R.id.row);

            rowTitle.setBackgroundResource(R.drawable.spinner_row_focused);

            TextView textView = (TextView) rowView.findViewById(R.id.title);
            textView.setTypeface(typeFace);
            textView.setText(objectsList.get(position).toString().trim());
            return rowView;
        }

        public View getCustomView1(int position, View convertView,
                ViewGroup parent) {
            LayoutInflater inflater = getLayoutInflater();
            View rowView = inflater.inflate(R.layout.spinner_dropdown, parent,
                    false);

            TextView textView = (TextView) rowView.findViewById(R.id.title);
            textView.setText(objectsList.get(position).toString().trim());
            textView.setTypeface(typeFace);
            return rowView;
        }
    }

Answer 1

这是您的解决方案:为页眉创建简单布局(文件 R.layout.spinner_head):

<ImageView
    android:id="@+id/spin_img"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1.0" 
    android:padding="5dip"
    android:src="@android:drawable/btn_star"
    android:layout_alignParentLeft="true"/>

<TextView
    android:id="@+id/title"
    android:textColor="#f00"
    android:gravity="center"
    android:text="Year"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true" 
    />

创建自定义微调器:

class MySpinner extends Spinner {

        public MySpinner(Context context) {
            super(context);
        }

        @Override
        public boolean performClick() {
            boolean handled =  false;//super.performClick();

            if (!handled) {

                handled = true;

                Context context = getContext();

                AlertDialog.Builder builder = new AlertDialog.Builder(context);
                CharSequence mPrompt = getPrompt();
                if (mPrompt != null) {

                    builder.setCustomTitle(getLayoutInflater().inflate(R.layout.spinner_head, null));

                }

                builder.setSingleChoiceItems(new DropDownAdapter(getAdapter()),getSelectedItemPosition(), this).show();

            }

            return handled;
        }

        @Override
        public void onClick(DialogInterface dialog, int which) {
            setSelection(which);
            dialog.dismiss();
        }

        class  DropDownAdapter implements ListAdapter, SpinnerAdapter {
            private SpinnerAdapter mAdapter;

            public  DropDownAdapter(SpinnerAdapter adapter) {
                this.mAdapter = adapter;
            }

            @Override
            public int getCount() {
                return mAdapter == null ? 0 : mAdapter.getCount();
            }

            @Override
            public Object getItem(int position) {
                return mAdapter == null ? null : mAdapter.getItem(position);
            }

            @Override
            public long getItemId(int position) {
                return mAdapter == null ? -1 : mAdapter.getItemId(position);
            }

            @Override
            public int getItemViewType(int position) {
                return 0;
            }

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                return getDropDownView(position, convertView, parent);
            }

            @Override
            public int getViewTypeCount() {
                return 1;
            }

            @Override
            public boolean hasStableIds() {
                return mAdapter != null && mAdapter.hasStableIds();
            }

            @Override
            public boolean isEmpty() {
                return getCount() == 0;
            }

            @Override
            public void registerDataSetObserver(DataSetObserver observer) {
                 if (mAdapter != null) {
                     mAdapter.registerDataSetObserver(observer);
                 }

            }

            @Override
            public void unregisterDataSetObserver(DataSetObserver observer) {
                 if (mAdapter != null) {
                     mAdapter.unregisterDataSetObserver(observer);
                 }

            }

            @Override
            public View getDropDownView(int position, View convertView,
                    ViewGroup parent) {
                return mAdapter == null ? null : mAdapter.getDropDownView(position, convertView, parent);
            }

            @Override
            public boolean areAllItemsEnabled() {
                return true;
            }

            @Override
            public boolean isEnabled(int arg0) {
                return true;
            }


        }
    }

创建微调器的实例

MySpinner theSpin = new MySpinner(this);
            theSpin.setPrompt("Select Item");
            ArrayAdapter<String> theAdapter = 
                new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, new String[]{"item1","item2","item3","item4","item5","item6" });
            theSpin.setAdapter(theAdapter);

现在使用这个将显示自定义标题的自定义微调器。您可以根据需要修改该 header 。