第一步：创建工具类
/**
* @data on /9/3 10:51 AM
* @auther
* @describe java 时间戳/字符串 之间转换
*/
public class DateUtil {
private static SimpleDateFormat sf = null;
// 将时间戳转成字符串
public static String getDateToString(long time) {
Date d = new Date(time);
sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sf.format(d);
}
//获取当前时间
public static String getCurrentDate() {
Date d = new Date();
sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sf.format(d);
}
//将字符串转换为时间戳
public static long getStringToDate(String time) {
sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = new Date();
try {
date = sf.parse(time);
} catch (ParseException e) {
e.printStackTrace();
}
return date.getTime();
}
//直接获取当前时间戳
public static String getTimeStamp() {
String currentDate = getCurrentDate();
sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = new Date();
try {
date = sf.parse(currentDate);
} catch (ParseException e) {
e.printStackTrace();
}
return String.valueOf(date.getTime());
}
}
然后，调用就完事儿了！
第二步：xml布局文件展示
xmlns:app="/apk/res-auto"
xmlns:tools="/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".show.Case25"
tools:ignore="MissingConstraints">
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/green"
app:title="java时间戳转字符串"
app:titleTextColor="@color/white" />
android:id="@+id/btn_show_time_chuo"
android:layout_width="match_parent"
app:layout_constraintTop_toBottomOf="@+id/toolbar"
android:layout_height="wrap_content"
android:text="获取当前时间戳" />
android:id="@+id/btn_show_time"
android:layout_width="match_parent"
app:layout_constraintTop_toBottomOf="@+id/btn_show_time_chuo"
android:layout_height="wrap_content"
android:text="获取当前时间" />
android:id="@+id/btn_change"
android:layout_width="match_parent"
app:layout_constraintTop_toBottomOf="@+id/btn_show_time"
android:layout_height="wrap_content"
android:text="时间戳转字符串" />
android:id="@+id/btn_change2"
android:layout_width="match_parent"
app:layout_constraintTop_toBottomOf="@+id/btn_change"
android:layout_height="wrap_content"
android:text="字符串转时间戳" />
android:id="@+id/tv_show"
android:layout_marginTop="40dp"
android:background="@color/blue"
android:textColor="@color/white"
android:textSize="20sp"
android:gravity="center"
tools:text="测试一下"
app:layout_constraintTop_toBottomOf="@id/btn_change2"
android:layout_width="match_parent"
android:layout_height="40dp"/>
第三步：调用工具类中的方法，完成转换
public class Case25 extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_case25);
Button getTimeChuo = findViewById(R.id.btn_show_time_chuo);
Button getTime = findViewById(R.id.btn_show_time);
Button changeToTime = findViewById(R.id.btn_change);
Button changeToChuo = findViewById(R.id.btn_change2);
TextView tvShow = findViewById(R.id.tv_show);
getTimeChuo.setOnClickListener((View)->{
tvShow.setText(DateUtil.getTimeStamp());
});
getTime.setOnClickListener((View)->{
tvShow.setText(DateUtil.getCurrentDate());
});
changeToTime.setOnClickListener((View)->{
tvShow.setText(DateUtil.getDateToString(1600074914));
});
changeToChuo.setOnClickListener((View)->{
//String.valueof(Long):long转成String类型
tvShow.setText(String.valueOf(DateUtil.getStringToDate("-09-18 18:00:00")));
});
}
}
