import android.app.Activity; import android.os.Bundle; import android.text.format.Time; import android.view.View; import android.widget.RelativeLayout; import android.widget.TextView; import java.util.Calendar; import butterknife.BindView; import butterknife.ButterKnife; import butterknife.OnClick; public class MainActivity extends Activity {  @BindView(R.id.tv_time)  TextView tvTime;  @BindView(R.id.activity_main)  RelativeLayout activityMain;  @BindView(R.id.tv_cal)  TextView tvCal;  Time time;  @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   ButterKnife.bind(this);   tvTime.setText("Time類");   tvCal.setText("Calender類");   initTime();  }  private void initTime() {   time = new Time();   time.setToNow();  }  @OnClick({R.id.tv_cal,R.id.tv_time})  public void onClick(View view) {   switch (view.getId()) {    case R.id.tv_time://點擊第一個     //月份是從0-11算的，所以顯示的話要+1     String times = time.year + "年" + time.month+1 + "月" + time.monthDay       + "日" + time.hour + "時" + time.minute + "分" + time.second + "秒"       + ":現在是一年中的第" + time.yearDay + "天";     tvTime.setText(times);     break;    case R.id.tv_cal:     Calendar cal=Calendar.getInstance();     String time_cal=""+cal.get(Calendar.YEAR)+"-"+cal.get(Calendar.MONTH)+1+"-"+cal.get(Calendar.DATE)+" "       +cal.get(Calendar.HOUR_OF_DAY)+":"+cal.get(Calendar.MINUTE);     tvCal.setText(time_cal);     break;   }  }  @Override  protected void onDestroy() {   super.onDestroy(); //  Unbinder unbinder=ButterKnife.bind(this); //  unbinder.unbind();   ButterKnife.bind(this).unbind();  } }