Spinner
<div id="cnblogs_post_body">1.设置Spinner之中的元素内容，采用了ArrayAdapter来描述，并通过setApdater()来设置adapter2.设置spinner展开的方式，这里通过设置ArrayAdapter的第二个参数，设置了spinner没有展开前的UI格式，simple_spinner_item是textview的label方式，而simple_spinner_dropdown_item这是点击圆圈选择方式。在这个例子中，我们将展开方式设置为点击圆圈选择
3.使用setOnItemSelectedListener()来设置Spinner的点击触发的callback函数，有onItemSelected和onNothingSelected两个接口需要具体给出。
通过调用资源文件的array创建adapter
<div class="cnblogs_code">public class MainActivity extends Activity implements OnItemSelectedListener { private Spinner sp; private TextView tv; private ArrayAdapter<CharSequence> adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sp = (Spinner) findViewById(R.id.spinner1); tv = (TextView) findViewById(R.id.textView1); adapter = ArrayAdapter.createFromResource(this, R.array.test, android.R.layout.simple_spinner_item); sp.setAdapter(adapter); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); sp.setOnItemSelectedListener(this); } @Override public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub tv.setText(sp.getItemAtPosition(arg2).toString()); } @Override public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub tv.setText(""); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; }}
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