Android控件入门-Spinner下拉菜单

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xml:

<Spinner
    android:id="@+id/spinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

java:

private static final String TAG = "MainActivity";
private Spinner s;
private String[] data = new String[]{"nihao", "aa", "bb"};

s = findViewById(R.id.spinner);
s.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data));
// 点击监听事件
s.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        Log.d(TAG, "onItemSelected: " + data[position]);
        Toast.makeText(getApplicationContext(), data[position], Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }
});