Android：控件Spinner、getResources、setDropDownViewResource、setOnItemSelectedListener

public class MainActivity extends Activity{    /**     * 1.XML文件配置：     * 添加弹出对话框的标题： android:prompt="@string/spinnername1"     * 2.Adapter的布局：android.R.layout.simple_spinner_item     * resource设置结果显示框的布局:new ArrayAdapter(context, resource, textViewResourceId)     * 3.点击事件：s1.setOnItemSelectedListener     * 4.设置弹出对话框的行布局：     * adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);     *     * 5.得到资源文件:Resources res = getResources()     * 6.通过资源id获取资源文件的内容：String[] arrStr = res.getStringArray(R.array.colors)     *     */    @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                            Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);                  Resources res = getResources();        String[] arrStr = res.getStringArray(R.array.colors);        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.spinnertextview, arrStr);        /**         * 1.APIdemo的原写法：         * ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(                this, R.array.colors, android.R.layout.simple_spinner_item);         * 2.ArrayAdapter.createFromResource         * 此方法将R.array.colors这个字符串数组文件的内容得到(通过id得到资源，通过方法得到内容)         */                  adapter.setDropDownViewResource(R.layout.spinnercheckeditem);        spinner1.setAdapter(adapter);                  spinner1.setOnItemSelectedListener(new OnItemSelectedListener()        {            @Override            public void onItemSelected(AdapterView<?> parent, View view,                    int position, long id)            {                Toast.makeText(MainActivity.this, "Spinner1: position=" + position + " id=" + id, Toast.LENGTH_SHORT).show();            }            @Override            public void onNothingSelected(AdapterView<?> parent)            {                Toast.makeText(MainActivity.this, "Spinner1: unselected", Toast.LENGTH_SHORT).show();            }        });    }          @Override    public boolean onCreateOptionsMenu(Menu menu)    {        getMenuInflater().inflate(R.menu.activity_main, menu);        return true;    }      }

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