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- How to Use the Spinner (the drop-down menu)
Tuesday, June 26, 2012
Spinner is a very handy tool if you want to write a drop-down menu
First to declare a Spinner in the xml
Then initialize the Spinner
Again to declare an array, you want to put information go Spinner management side of
Then we want to use ArrayAdapter to assign it to Spinner
Then we have to set the how to deal with them at this time we will join the event an item when the user presses the Spinner
Code
http://uploadingit.com/file/rfq2ac02xoanegtk/SpinnerDemo.zip
First to declare a Spinner in the xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Spinner android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/mySpinner" /> </LinearLayout> Then initialize the Spinner
private Spinner spinner; private ArrayAdapter<String> lunchList; private Context mContext; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mContext = this.getApplicationContext(); spinner = (Spinner)findViewById(R.id.mySpinner); }
Again to declare an array, you want to put information go Spinner management side of
private String[] lunch = {""};
Then we want to use ArrayAdapter to assign it to Spinner
lunchList = new ArrayAdapter<String>(SpinnerDemo.this, android.R.layout.simple_spinner_item, lunch); spinner.setAdapter(lunchList);
Then we have to set the how to deal with them at this time we will join the event an item when the user presses the Spinner
spinner.setOnItemSelectedListener(new OnItemSelectedListener(){ @Override public void onItemSelected(AdapterView<?> arg0, View arg1,int position, long arg3) { Toast.makeText(mContext, "你選的是"+lunch[position], Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub } });
Code
http://uploadingit.com/file/rfq2ac02xoanegtk/SpinnerDemo.zip