如何将删除项目选项添加到 Spinner 下拉列表

Question

如果单击每个项目右侧的 "X" 按钮，我想让用户可以删除显示在微调器下拉列表中的项目，请参见下面的示例。

如果用户点击该项目，Spinner 应该像经典的 Android 默认 Spinner 一样工作。

我应该如何扩展和重新定义Spinner 才能以这种方式工作？

Answer 1

我想你正在寻找这个：

MainActivity：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    spnView3 = (Spinner) findViewById(R.id.spnView3);

    ArrayList<String> aList = new ArrayList<String>();
    aList.add("--Select--");
    aList.add("Md. Shahadat Sarker");
    aList.add("Developer");
    aList.add("ErrrorPoint");

    spnView3.setAdapter(new SpinnerAdapter(this, R.layout.spinner_row, aList, aList));

    Toast.makeText(this, "Selected: " + spnView3.getSelectedItem(), 500).show();

}

activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Spinner
        android:id="@+id/spnView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="left" />

</RelativeLayout>

spinner_row.xml（布局）：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:baselineAligned="false"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="9"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/spnItemName"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="9"
            android:text="Item Name"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/spnItemDel"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="X"
            android:textAppearance="?android:attr/textAppearanceSmall" />
    </LinearLayout>

</LinearLayout>

适配器：

public View getCustomView(final int position, View convertView, ViewGroup parent){
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        View rowView =  inflater.inflate(R.layout.spinner_row, parent, false);

        spnItemName = (TextView) rowView.findViewById(R.id.spnItemName);
        spnItemDel = (TextView) rowView.findViewById(R.id.spnItemDel);

        spnItemName.setText(iName.get(position)+"");

        spnItemDel.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(context, "Deleted", Toast.LENGTH_SHORT).show();
                //iName[position] = null;
                iName.remove(position);
                notifyDataSetChanged();
            }
        });
        return rowView;
    }

完整的例子是here... download

编辑部分：

   if( /*Your condition goes here*/ ){
        spnItemName.setVisibility(View.GONE);
    } else{
        spnItemName.setVisibility(View.VISIBLE);
    }