Android多列显示的下拉列表框Spinner Android编程实现多列显示的下拉列表框Spinner功能示例
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本文实例讲述了Android编程实现多列显示的下拉列表框Spinner功能。分享给大家供大家参考,具体如下:
先上张效果图:
严格来说,这并不是一个下拉列表,只不过实现的效果很像是下拉列表
实现原理:
该下拉列表其实是一个AlertDialog.Builder,给它设置了一个以LinearLayout布局的View。该View内使用了一个GridView组件,
代码:
package yyy.testandroid9; private Intent intent; private int index = 0; private SharedPreferences preferences; private File file; private Spinner spinner; private GridView gridView; private LinearLayout layout; private Builder builder; private AlertDialog dialog; private MyAdapter adapter; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); LayoutInflater inflater = LayoutInflater.from(this); layout = (LinearLayout) inflater.inflate(R.layout.bank_grid, null); gridView = (GridView) layout.findViewById(R.id.grid); adapter = new MyAdapter(this); gridView.setAdapter(adapter); button1 = (Button) findViewById(R.id.button1); button2 = (Button) findViewById(R.id.button2); textView = (TextView) findViewById(R.id.textview); builder = new Builder(TestAndroid9Activity.this); builder.setView(layout); button1.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub if(dialog == null){ dialog = builder.show(); } dialog.show(); } }); gridView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) { // TODO Auto-generated method stub button1.setText(getResources().getStringArray(R.array.city)[position]); dialog.dismiss(); adapter.map.put(index, false); adapter.map.put(position, true); index = position; adapter.notifyDataSetChanged(); } }); } private class MyAdapter extends BaseAdapter{ private Context context; private String[] citys; private LayoutInflater inflater; public HashMap<Integer, Boolean> map; public MyAdapter(Context context) { super(); this.context = context; citys = context.getResources().getStringArray(R.array.city); inflater = LayoutInflater.from(context); map = new HashMap<Integer, Boolean>(); for(int i=0;i<citys.length;i++){ map.put(i, false); } } public int getCount() { // TODO Auto-generated method stub return citys.length; } public Object getItem(int position) { // TODO Auto-generated method stub return null; } public long getItemId(int position) { // TODO Auto-generated method stub return position; } public View getView(int position, View view, ViewGroup parent) { // TODO Auto-generated method stub if(view == null){ view = inflater.inflate(R.layout.bank_item, null); } TextView textView = (TextView) view.findViewById(R.id.list_text); RadioButton radioButton = (RadioButton) view.findViewById(R.id.radiobutton); radioButton.setChecked(map.get(position)); textView.setText(citys[position]); return view; } }
bank_grid.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="20dp" android:background="#ffffff" android:id="@+id/grid_layout"> <GridView android:id="@+id/grid" android:layout_width="fill_parent" android:layout_height="fill_parent" android:verticalSpacing="20px" android:horizontalSpacing="10px" android:numColumns="4" android:scrollbars="vertical" android:layout_margin="10dp"/> </LinearLayout>
bank_item.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ffffff" > <RadioButton android:id="@+id/radiobutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="15dp" android:focusable="false" android:clickable="false" android:focusableInTouchMode="false" /> <TextView android:id="@+id/list_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#000000" android:layout_gravity="center_vertical"/> </LinearLayout>
希望本文所述对大家Android程序设计有所帮助。
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