Android 下拉框

Android 下拉框的使用方法 直接上代码

            <Spinner
                android:id="@+id/spinner"
                android:layout_width="100px"
                android:layout_height="80px">
            </Spinner>

       Spinner  m_Spinenr = (Spinner)findViewById(R.id.spinner);
       final String[] list = {"A","B","C","D","E","F","G"};
       String value = "";

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.custom_spiner_text_item,list);
        //参数2是样式   R.layout.custom_spiner_text_item 是自定义的样式 是在res/layout/ 目录下 一个名为  custom_spiner_text_item  文件里定义的样式  如下

        /*
            <TextView xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/textViewCustom"
            style="?android:attr/spinnerItemStyle"
            android:layout_width="100px"
            android:layout_height="40px"
            android:textSize="20sp" />
        */

        //系统自带样式有三种  
        // simple_spinner_item   simple_spinner_dropdown_item   simple_expandable_list_item_1

        m_Spinenr.setAdapter(adapter );
        m_Spinenr.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
                value = list [pos];  //取出选中的值
            }
            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });