Android下拉框控件Spinner的使用

select_spinner.xml

<?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:orientation="vertical"  >  <TextView      android:id="@+id/TextView01"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="this is FirstActivity of AppB"    />    <Spinner     android:id="@+id/spinner"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     />  </LinearLayout>

代码实现：

 protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.select_spinner);                                        spinner = (Spinner) findViewById(R.id.spinner);        spinner.setPrompt("请选择");        final int [] drawableIds = {R.drawable.aa, R.drawable.icon};        final int [] msgIds = {R.string.aa, R.string.bb};                                BaseAdapter baseAdapter = new BaseAdapter() {            @Override            public int getCount() {                return msgIds.length;            }            @Override            public Object getItem(int position) {                return null;            }            @Override            public long getItemId(int position) {                return 0;            }            @Override            public View getView(int position, View convertView, ViewGroup parent) {             // 动态生成每个下拉项对应的View，每个下拉项View由LinearLayout             // 中包含一个ImageView及一个TextView构成             // 初始化LinearLayout             LinearLayout ll = new LinearLayout(TestActivity.this);             ll.setOrientation(LinearLayout.HORIZONTAL);             // 初始化ImageView             ImageView ii = new ImageView(TestActivity.this);             ii.setImageDrawable((getResources().getDrawable(drawableIds[position])));             ll.addView(ii);             // 初始化TextView             TextView tv = new TextView(TestActivity.this);             tv.setText(" " + getResources().getText(msgIds[position]));             tv.setTextColor(R.color.blue);             tv.setTextSize(24);             ll.addView(tv);             return ll;            }                    };                        spinner.setAdapter(baseAdapter);        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {             @Override             public void onItemSelected(AdapterView<?> arg0, View view,                     int arg2, long arg3) {                 //被选中时候发生的动作                Log.i("chen", "===="+arg0+"   "+view+"    "+arg2+"    "+arg3);                             // 获取主界面TextView                TextView tv = (TextView) findViewById(R.id.TextView01);                // 获取当前选中选项对应的LinearLayout                LinearLayout ll = (LinearLayout) view;                // 获取其中的TextView                TextView tvn = (TextView) ll.getChildAt(1);                // 用StringBuilder动态生成信息                StringBuilder sb = new StringBuilder();                sb.append(getResources().getText(R.string.app_name));                sb.append(":");                sb.append(tvn.getText());                // 信息设置进住界面                tv.setText(sb.toString());            }             @Override             public void onNothingSelected(AdapterView<?> arg0) {                             }         });    }

如果用ArrayAdapter实现如下：

//设置下拉框控件的标题文本内容：spinner.setPrompt("请选择");//定义下拉框内容：String [] datas = {“ATAAW.COM”,”Android.com”,”Google.com”};//定义添加适配器：ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource( this, datas, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter);//响应下拉框的选中值发生变化的事件处理：spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {             @Override             public void onItemSelected(AdapterView<?> arg0, View arg1,                     int arg2, long arg3) {                 //被选中时候发生的动作             }             @Override             public void onNothingSelected(AdapterView<?> arg0) {             }         });

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