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());