Android开发获取当前系统日期和时间功能示例

public class MainActivity extends AppCompatActivity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    //创建线性布局管理器    LinearLayout layout = new LinearLayout(this);    //显示改layout    super.setContentView(layout);    layout.setOrientation(LinearLayout.VERTICAL); //创建TextView    final TextView show = new TextView(this); //创建Button    Button bn = new Button(this);    bn.setText(R.string.ok);    bn.setLayoutParams(new ViewGroup.LayoutParams(        ViewGroup.LayoutParams.WRAP_CONTENT,        ViewGroup.LayoutParams.MATCH_PARENT)); //添加TextView    layout.addView(show); //添加Button    layout.addView(bn); //设置一个监听事件    bn.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        show.setText("hello , Android , " + new java.util.Date());      }    });  }}

show.setText("hello , Android , " + new java.util.Date());