<TextView
        android:id="@+id/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="216dp"
        android:text="點擊選擇時間"
        android:textSize="20sp"/>

public class MainActivity extends Activity {

    private TextView time;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        time.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
             showtime();
            }
        });
    }

    private void initView() {
        time = (TextView) findViewById(R.id.time);
    }
    private void showtime() {
        Calendar calendar = Calendar.getInstance();//調(diào)用Calendar類獲取年月日
        int  mYear = calendar.get(Calendar.YEAR);//年
        int  mMonth = calendar.get(Calendar.MONTH);//月份要加一個一，這個值的初始值是0。不加會日期會少一月。
        int  mDay = calendar.get(Calendar.DAY_OF_MONTH);//日
        DatePickerDialog datePickerDialog = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {
              time.setText(i + "年" + (i1+1) + "月" + i2 + "日");//當(dāng)選擇完后將時間顯示,記得月份i1加一

            }
        }, mYear,mMonth, mDay);//將年月日放入DatePickerDialog中，并將值傳給參數(shù)

        datePickerDialog.show();//顯示dialog

    }
}