public class MainActivity extends Activity { private Button buttonDate; private Button buttonTime; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  buttonDate = (Button) findViewById(R.id.dataBn);  buttonTime = (Button) findViewById(R.id.timeBn);  iniClick();//Binding the listeners for you program } public void iniClick(){  //set listener for your Date button  buttonDate.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    Calendar calendar = Calendar.getInstance();    //create a datePickerDialog and then shoe it on your screen    new DatePickerDialog(MainActivity.this,//binding the listener for your DatePickerDialog      new DatePickerDialog.OnDateSetListener() {       @Override       public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {        Toast.makeText(MainActivity.this,"Year:" + year + " Month:" + month + " Day:" + dayOfMonth,Toast.LENGTH_SHORT).show();       }      }      , calendar.get(Calendar.YEAR)      , calendar.get(Calendar.MONTH)      , calendar.get(Calendar.DAY_OF_MONTH)).show();   }  });  //set listener for your Time button  buttonTime.setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    Calendar calendar = Calendar.getInstance();    //create a datePickerDialog and then shoe it on your screen    new TimePickerDialog(MainActivity.this,      new TimePickerDialog.OnTimeSetListener() {       @Override       public void onTimeSet(TimePicker view, int hourOfDay, int minute) {        Toast.makeText(MainActivity.this,"Hour:" + hourOfDay + " Minute:" + minute ,Toast.LENGTH_SHORT).show();       }      }      , calendar.get(Calendar.HOUR_OF_DAY)      , calendar.get(Calendar.MINUTE)      , true).show();   }  }); }}

<?xml version="1.0" encoding="utf-8" ?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/idtatabHost" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" android:layout_weight="1"> <Button  android:id="@+id/dataBn"  android:text="點我一下 挑日期"  android:layout_width="0dp"  android:layout_weight="1"  android:layout_height="wrap_content" /> <Button  android:id="@+id/timeBn"  android:text="點我一下 挑時間 。。。"  android:layout_width="0dp"  android:layout_weight="1"  android:layout_height="wrap_content" /></LinearLayout>