Android进阶之路

因当前项目需要计算时间差，进行数据处理，所以在Csdn上找了一下，之后修修补补是可以用的，建议大家如果用到项目中的话，可能需要把老的时间戳或者时间format存储在文件或者sp中，之后用于判断，然后进行自己的逻辑处理。

Effect :

Log执行：

注：这个可以自己简单封装下，比较简单。

MainActivity :

package com.bakheet.effect.time;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.TextView;import android.widget.Toast;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;public class MainActivity extends AppCompatActivity {    private SimpleDateFormat format;    public String oldtime ;    public String newtime;    private TextView mContent;    private TextView mCount;    private TextView mBtnNow;    private TextView mBtn;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        mBtn = (TextView) findViewById(R.id.btn);        mBtnNow = (TextView) findViewById(R.id.btn_now);        mCount = (TextView) findViewById(R.id.count);        mContent = (TextView) findViewById(R.id.content);        //Csdn内一篇博主的博文        mBtn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Toast.makeText(MainActivity.this,"Csdn博友事件触发",Toast.LENGTH_SHORT).show();                try {                Date d1 = format.parse("2012-11-05 12:00:00");//后的时间                Date d2 = format.parse("2012-11-04 11:10:00"); //前的时间                Long diff = d1.getTime() - d2.getTime();   //两时间差，精确到毫秒                Long day = diff / (1000 * 60 * 60 * 24);          //以天数为单位取整                Long hour=(diff/(60*60*1000)-day*24);             //以小时为单位取整                Long min=((diff/(60*1000))-day*24*60-hour*60);    //以分钟为单位取整                Long second=(diff/1000-day*24*60*60-hour*60*60-min*60);//秒                    Log.e("tag","day =" +day);                    Log.e("tag","hour =" +hour);                    Log.e("tag","min =" +min);                    Log.e("tag","second =" +second);                    mContent.setText("day = "+day+"，hour = "+hour+"，min = "+min+"，second = "+second);                } catch (Exception e) {                    e.printStackTrace();                }            }        });        //获取当前的时间戳和时间转译    - 这里同时用存储老的时间        mBtnNow.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Toast.makeText(MainActivity.this,"获取当前时间",Toast.LENGTH_SHORT).show();                long timeMillis = System.currentTimeMillis();                Log.e("tag timeMillis =",""+timeMillis);                //将时间戳转为日期格式                String time = stampToDate(timeMillis);                Log.e("tag time = ",time);                oldtime=time;                Log.e("tag newtime = ",oldtime);                try {                    //将日期格式转回为时间戳的格式                    String what = dateToStamp(time);                    Log.e("tag what = ",what);                } catch (ParseException e) {                    e.printStackTrace();                }            }        });        //This is my code -  - 主要作用与计算时间差 （会用到之前我们的记录的时间，所以使用的时候，无比先执行上面的逻辑）        mCount.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                //思维方式，使用最新的时间减去之前我们的老时间进行运算                Toast.makeText(MainActivity.this,"新老时间触发",Toast.LENGTH_SHORT).show();                long timeMillis = System.currentTimeMillis();                Log.e("tag timeMillis =",""+timeMillis);                String time = stampToDate(timeMillis);                Log.e("tag time = ",time);                newtime=time;                Log.e("tag newtime = ",newtime);                try {                //严格来讲，在使用中这里需要判断的，尤其是null的判断，这里我们使用的了 try catch                Date d1 = format.parse(newtime); //当前时间                Date d2 = format.parse(oldtime); //之前记录的时间                Long diff = d1.getTime() - d2.getTime();   //两时间差，精确到毫秒                    //以天数为单位取整                    Long day = diff / (1000 * 60 * 60 * 24);                    //以小时为单位取整                    Long hour=(diff/(60*60*1000)-day*24);                    //以分钟为单位取整                    Long min=((diff/(60*1000))-day*24*60-hour*60);                    //以秒为单位                    Long second=(diff/1000-day*24*60*60-hour*60*60-min*60);                    Log.e("tag","day =" +day);                    Log.e("tag","hour =" +hour);                    Log.e("tag","min =" +min);                    Log.e("tag","second =" +second);                    mContent.setText("day = "+day+"，hour = "+hour+"，min = "+min+"，second = "+second);                } catch (Exception e) {                    //建议抛出总异常                    e.printStackTrace();                }            }        });    }     /**     * 将时间转换为时间戳     */    public String dateToStamp(String time) throws ParseException {        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        Date date = simpleDateFormat.parse(time);        long ts = date.getTime();        return String.valueOf(ts);    }     /**     * 将时间戳转换为时间     */    public String stampToDate(long timeMillis){        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        Date date = new Date(timeMillis);        return simpleDateFormat.format(date);    }}

MainActivity Xml :

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.bakheet.effect.time.MainActivity">    <TextView        android:layout_marginTop="10dp"        android:layout_width="match_parent"        android:padding="5dp"        android:layout_height="wrap_content"        android:text="csdn博友时间差算法"        android:gravity="center"        android:id="@+id/btn"        />    <TextView        android:layout_marginTop="10dp"        android:layout_width="match_parent"        android:padding="5dp"        android:layout_height="wrap_content"        android:gravity="center"        android:text="当前时间"        android:id="@+id/btn_now"        />    <TextView        android:layout_marginTop="10dp"        android:layout_width="match_parent"        android:padding="5dp"        android:layout_height="wrap_content"        android:gravity="center"        android:id="@+id/count"        android:text="新老时间计算"        />    <TextView        android:layout_marginTop="10dp"        android:layout_width="match_parent"        android:padding="5dp"        android:layout_height="wrap_content"        android:gravity="center"        android:id="@+id/content"        android:text=""        /></LinearLayout>