<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <!-- 显示网络状态的标签控件 --> <TextView android:id="@+id/myyl" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="20dp" /> </RelativeLayout>
package com.example.yanlei.yl; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.text.format.DateFormat; import android.widget.TextView; import java.text.SimpleDateFormat; import java.util.Calendar; public class MainActivity extends AppCompatActivity { private TextView pTextView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pTextView = (TextView) findViewById(R.id.myyl); SimpleDateFormat sDateFormat; String date; if (DateFormat.is24HourFormat(getApplicationContext())) { sDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); date = sDateFormat.format(new java.util.Date()); } else { sDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); date = sDateFormat.format(new java.util.Date()) + getPeroidText(); } pTextView.setText("时间:" + date); } private CharSequence getPeroidText() { String am_pm = Calendar.getInstance().getTime().getHours() >= 12 ? "PM" : "AM"; return am_pm; } }