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Android快速开发系列 10个常用工具类实例代码详解

程序员文章站 2022-06-19 19:48:42
打开大家手上的项目,基本都会有一大批的辅助类,今天特此整理出10个基本每个项目中都会使用的工具类,用于快速开发~~在此感谢群里给我发项目中工具类的兄弟/姐妹~ 1、日志工...

打开大家手上的项目,基本都会有一大批的辅助类,今天特此整理出10个基本每个项目中都会使用的工具类,用于快速开发~~在此感谢群里给我发项目中工具类的兄弟/姐妹~

1、日志工具类l.java

package com.zhy.utils;

import android.util.log;
/**
 * log统一管理类
 * 
 * 
 * 
 */
public class l
{
 private l()
 {
 /* cannot be instantiated */
 throw new unsupportedoperationexception("cannot be instantiated");
 }
 public static boolean isdebug = true;// 是否需要打印bug,可以在application的oncreate函数里面初始化
 private static final string tag = "way";
 // 下面四个是默认tag的函数
 public static void i(string msg)
 {
 if (isdebug)
 log.i(tag, msg);
 }
 public static void d(string msg)
 {
 if (isdebug)
 log.d(tag, msg);
 }
 public static void e(string msg)
 {
 if (isdebug)
 log.e(tag, msg);
 }
 public static void v(string msg)
 {
 if (isdebug)
 log.v(tag, msg);
 }
 // 下面是传入自定义tag的函数
 public static void i(string tag, string msg)
 {
 if (isdebug)
 log.i(tag, msg);
 }
 public static void d(string tag, string msg)
 {
 if (isdebug)
 log.i(tag, msg);
 }
 public static void e(string tag, string msg)
 {
 if (isdebug)
 log.i(tag, msg);
 }
 public static void v(string tag, string msg)
 {
 if (isdebug)
 log.i(tag, msg);
 }
}

网上看到的类,注释上应该原创作者的名字,很简单的一个类;网上也有很多提供把日志记录到sdcard上的,不过我是从来没记录过,所以引入个最简单的,大家可以进行评价是否需要扩充~~

2、toast统一管理类

package com.zhy.utils;

import android.content.context;
import android.widget.toast;
/**
 * toast统一管理类
 * 
 */
public class t
{
 private t()
 {
 /* cannot be instantiated */
 throw new unsupportedoperationexception("cannot be instantiated");
 }
 public static boolean isshow = true;
 /**
 * 短时间显示toast
 * 
 * @param context
 * @param message
 */
 public static void showshort(context context, charsequence message)
 {
 if (isshow)
 toast.maketext(context, message, toast.length_short).show();
 }
 /**
 * 短时间显示toast
 * 
 * @param context
 * @param message
 */
 public static void showshort(context context, int message)
 {
 if (isshow)
 toast.maketext(context, message, toast.length_short).show();
 }
 /**
 * 长时间显示toast
 * 
 * @param context
 * @param message
 */
 public static void showlong(context context, charsequence message)
 {
 if (isshow)
 toast.maketext(context, message, toast.length_long).show();
 }
 /**
 * 长时间显示toast
 * 
 * @param context
 * @param message
 */
 public static void showlong(context context, int message)
 {
 if (isshow)
 toast.maketext(context, message, toast.length_long).show();
 }
 /**
 * 自定义显示toast时间
 * 
 * @param context
 * @param message
 * @param duration
 */
 public static void show(context context, charsequence message, int duration)
 {
 if (isshow)
 toast.maketext(context, message, duration).show();
 }
 /**
 * 自定义显示toast时间
 * 
 * @param context
 * @param message
 * @param duration
 */
 public static void show(context context, int message, int duration)
 {
 if (isshow)
 toast.maketext(context, message, duration).show();
 }
}

也是非常简单的一个封装,能省则省了~~

3、sharedpreferences封装类sputils

package com.zhy.utils;

import java.lang.reflect.invocationtargetexception;
import java.lang.reflect.method;
import java.util.map;
import android.content.context;
import android.content.sharedpreferences;
public class sputils
{
 /**
 * 保存在手机里面的文件名
 */
 public static final string file_name = "share_data";
 /**
 * 保存数据的方法,我们需要拿到保存数据的具体类型,然后根据类型调用不同的保存方法
 * 
 * @param context
 * @param key
 * @param object
 */
 public static void put(context context, string key, object object)
 {
 sharedpreferences sp = context.getsharedpreferences(file_name,
 context.mode_private);
 sharedpreferences.editor editor = sp.edit();
 if (object instanceof string)
 {
 editor.putstring(key, (string) object);
 } else if (object instanceof integer)
 {
 editor.putint(key, (integer) object);
 } else if (object instanceof boolean)
 {
 editor.putboolean(key, (boolean) object);
 } else if (object instanceof float)
 {
 editor.putfloat(key, (float) object);
 } else if (object instanceof long)
 {
 editor.putlong(key, (long) object);
 } else
 {
 editor.putstring(key, object.tostring());
 }
 sharedpreferencescompat.apply(editor);
 }
 /**
 * 得到保存数据的方法,我们根据默认值得到保存的数据的具体类型,然后调用相对于的方法获取值
 * 
 * @param context
 * @param key
 * @param defaultobject
 * @return
 */
 public static object get(context context, string key, object defaultobject)
 {
 sharedpreferences sp = context.getsharedpreferences(file_name,
 context.mode_private);
 if (defaultobject instanceof string)
 {
 return sp.getstring(key, (string) defaultobject);
 } else if (defaultobject instanceof integer)
 {
 return sp.getint(key, (integer) defaultobject);
 } else if (defaultobject instanceof boolean)
 {
 return sp.getboolean(key, (boolean) defaultobject);
 } else if (defaultobject instanceof float)
 {
 return sp.getfloat(key, (float) defaultobject);
 } else if (defaultobject instanceof long)
 {
 return sp.getlong(key, (long) defaultobject);
 }
 return null;
 }
 /**
 * 移除某个key值已经对应的值
 * @param context
 * @param key
 */
 public static void remove(context context, string key)
 {
 sharedpreferences sp = context.getsharedpreferences(file_name,
 context.mode_private);
 sharedpreferences.editor editor = sp.edit();
 editor.remove(key);
 sharedpreferencescompat.apply(editor);
 }
 /**
 * 清除所有数据
 * @param context
 */
 public static void clear(context context)
 {
 sharedpreferences sp = context.getsharedpreferences(file_name,
 context.mode_private);
 sharedpreferences.editor editor = sp.edit();
 editor.clear();
 sharedpreferencescompat.apply(editor);
 }
 /**
 * 查询某个key是否已经存在
 * @param context
 * @param key
 * @return
 */
 public static boolean contains(context context, string key)
 {
 sharedpreferences sp = context.getsharedpreferences(file_name,
 context.mode_private);
 return sp.contains(key);
 }
 /**
 * 返回所有的键值对
 * 
 * @param context
 * @return
 */
 public static map<string, ?> getall(context context)
 {
 sharedpreferences sp = context.getsharedpreferences(file_name,
 context.mode_private);
 return sp.getall();
 }
 /**
 * 创建一个解决sharedpreferencescompat.apply方法的一个兼容类
 * 
 * @author zhy
 * 
 */
 private static class sharedpreferencescompat
 {
 private static final method sapplymethod = findapplymethod();
 /**
 * 反射查找apply的方法
 * 
 * @return
 */
 @suppresswarnings({ "unchecked", "rawtypes" })
 private static method findapplymethod()
 {
 try
 {
 class clz = sharedpreferences.editor.class;
 return clz.getmethod("apply");
 } catch (nosuchmethodexception e)
 {
 }
 return null;
 }
 /**
 * 如果找到则使用apply执行,否则使用commit
 * 
 * @param editor
 */
 public static void apply(sharedpreferences.editor editor)
 {
 try
 {
 if (sapplymethod != null)
 {
  sapplymethod.invoke(editor);
  return;
 }
 } catch (illegalargumentexception e)
 {
 } catch (illegalaccessexception e)
 {
 } catch (invocationtargetexception e)
 {
 }
 editor.commit();
 }
 }
}

对sharedpreference的使用做了建议的封装,对外公布出put,get,remove,clear等等方法;注意一点,里面所有的commit操作使用了sharedpreferencescompat.apply进行了替代,目的是尽可能的使用apply代替commit首先说下为什么,因为commit方法是同步的,并且我们很多时候的commit操作都是ui线程中,毕竟是io操作,尽可能异步;所以我们使用apply进行替代,apply异步的进行写入;但是apply相当于commit来说是new api呢,为了更好的兼容,我们做了适配;sharedpreferencescompat也可以给大家创建兼容类提供了一定的参考~~

4、单位转换类 densityutils

package com.zhy.utils;

import android.content.context;
import android.util.typedvalue;
/**
 * 常用单位转换的辅助类
 * 
 * 
 * 
 */
public class densityutils
{
 private densityutils()
 {
 /* cannot be instantiated */
 throw new unsupportedoperationexception("cannot be instantiated");
 }
 /**
 * dp转px
 * 
 * @param context
 * @param val
 * @return
 */
 public static int dp2px(context context, float dpval)
 {
 return (int) typedvalue.applydimension(typedvalue.complex_unit_dip,
 dpval, context.getresources().getdisplaymetrics());
 }
 /**
 * sp转px
 * 
 * @param context
 * @param val
 * @return
 */
 public static int sp2px(context context, float spval)
 {
 return (int) typedvalue.applydimension(typedvalue.complex_unit_sp,
 spval, context.getresources().getdisplaymetrics());
 }
 /**
 * px转dp
 * 
 * @param context
 * @param pxval
 * @return
 */
 public static float px2dp(context context, float pxval)
 {
 final float scale = context.getresources().getdisplaymetrics().density;
 return (pxval / scale);
 }
 /**
 * px转sp
 * 
 * @param fontscale
 * @param pxval
 * @return
 */
 public static float px2sp(context context, float pxval)
 {
 return (pxval / context.getresources().getdisplaymetrics().scaleddensity);
 }
}

5、sd卡相关辅助类 sdcardutils

package com.zhy.utils;

import java.io.file;
import android.os.environment;
import android.os.statfs;
/**
 * sd卡相关的辅助类
 * 
 * 
 * 
 */
public class sdcardutils
{
 private sdcardutils()
 {
 /* cannot be instantiated */
 throw new unsupportedoperationexception("cannot be instantiated");
 }
 /**
 * 判断sdcard是否可用
 * 
 * @return
 */
 public static boolean issdcardenable()
 {
 return environment.getexternalstoragestate().equals(
 environment.media_mounted);
 }
 /**
 * 获取sd卡路径
 * 
 * @return
 */
 public static string getsdcardpath()
 {
 return environment.getexternalstoragedirectory().getabsolutepath()
 + file.separator;
 }
 /**
 * 获取sd卡的剩余容量 单位byte
 * 
 * @return
 */
 public static long getsdcardallsize()
 {
 if (issdcardenable())
 {
 statfs stat = new statfs(getsdcardpath());
 // 获取空闲的数据块的数量
 long availableblocks = (long) stat.getavailableblocks() - 4;
 // 获取单个数据块的大小(byte)
 long freeblocks = stat.getavailableblocks();
 return freeblocks * availableblocks;
 }
 return 0;
 }
 /**
 * 获取指定路径所在空间的剩余可用容量字节数,单位byte
 * 
 * @param filepath
 * @return 容量字节 sdcard可用空间,内部存储可用空间
 */
 public static long getfreebytes(string filepath)
 {
 // 如果是sd卡的下的路径,则获取sd卡可用容量
 if (filepath.startswith(getsdcardpath()))
 {
 filepath = getsdcardpath();
 } else
 {// 如果是内部存储的路径,则获取内存存储的可用容量
 filepath = environment.getdatadirectory().getabsolutepath();
 }
 statfs stat = new statfs(filepath);
 long availableblocks = (long) stat.getavailableblocks() - 4;
 return stat.getblocksize() * availableblocks;
 }
 /**
 * 获取系统存储路径
 * 
 * @return
 */
 public static string getrootdirectorypath()
 {
 return environment.getrootdirectory().getabsolutepath();
 }
}

6、屏幕相关辅助类 screenutils

package com.zhy.utils;

import android.app.activity;
import android.content.context;
import android.graphics.bitmap;
import android.graphics.rect;
import android.util.displaymetrics;
import android.view.view;
import android.view.windowmanager;
/**
 * 获得屏幕相关的辅助类
 * 
 * 
 * 
 */
public class screenutils
{
 private screenutils()
 {
 /* cannot be instantiated */
 throw new unsupportedoperationexception("cannot be instantiated");
 }
 /**
 * 获得屏幕高度
 * 
 * @param context
 * @return
 */
 public static int getscreenwidth(context context)
 {
 windowmanager wm = (windowmanager) context
 .getsystemservice(context.window_service);
 displaymetrics outmetrics = new displaymetrics();
 wm.getdefaultdisplay().getmetrics(outmetrics);
 return outmetrics.widthpixels;
 }
 /**
 * 获得屏幕宽度
 * 
 * @param context
 * @return
 */
 public static int getscreenheight(context context)
 {
 windowmanager wm = (windowmanager) context
 .getsystemservice(context.window_service);
 displaymetrics outmetrics = new displaymetrics();
 wm.getdefaultdisplay().getmetrics(outmetrics);
 return outmetrics.heightpixels;
 }
 /**
 * 获得状态栏的高度
 * 
 * @param context
 * @return
 */
 public static int getstatusheight(context context)
 {
 int statusheight = -1;
 try
 {
 class<?> clazz = class.forname("com.android.internal.r$dimen");
 object object = clazz.newinstance();
 int height = integer.parseint(clazz.getfield("status_bar_height")
  .get(object).tostring());
 statusheight = context.getresources().getdimensionpixelsize(height);
 } catch (exception e)
 {
 e.printstacktrace();
 }
 return statusheight;
 }
 /**
 * 获取当前屏幕截图,包含状态栏
 * 
 * @param activity
 * @return
 */
 public static bitmap snapshotwithstatusbar(activity activity)
 {
 view view = activity.getwindow().getdecorview();
 view.setdrawingcacheenabled(true);
 view.builddrawingcache();
 bitmap bmp = view.getdrawingcache();
 int width = getscreenwidth(activity);
 int height = getscreenheight(activity);
 bitmap bp = null;
 bp = bitmap.createbitmap(bmp, 0, 0, width, height);
 view.destroydrawingcache();
 return bp;
 }
 /**
 * 获取当前屏幕截图,不包含状态栏
 * 
 * @param activity
 * @return
 */
 public static bitmap snapshotwithoutstatusbar(activity activity)
 {
 view view = activity.getwindow().getdecorview();
 view.setdrawingcacheenabled(true);
 view.builddrawingcache();
 bitmap bmp = view.getdrawingcache();
 rect frame = new rect();
 activity.getwindow().getdecorview().getwindowvisibledisplayframe(frame);
 int statusbarheight = frame.top;
 int width = getscreenwidth(activity);
 int height = getscreenheight(activity);
 bitmap bp = null;
 bp = bitmap.createbitmap(bmp, 0, statusbarheight, width, height
 - statusbarheight);
 view.destroydrawingcache();
 return bp;
 }
}

7、app相关辅助类

package com.zhy.utils;

import android.content.context;
import android.content.pm.packageinfo;
import android.content.pm.packagemanager;
import android.content.pm.packagemanager.namenotfoundexception;
/**
 * 跟app相关的辅助类
 * 
 * 
 * 
 */
public class apputils
{
 private apputils()
 {
 /* cannot be instantiated */
 throw new unsupportedoperationexception("cannot be instantiated");
 }
 /**
 * 获取应用程序名称
 */
 public static string getappname(context context)
 {
 try
 {
 packagemanager packagemanager = context.getpackagemanager();
 packageinfo packageinfo = packagemanager.getpackageinfo(
  context.getpackagename(), 0);
 int labelres = packageinfo.applicationinfo.labelres;
 return context.getresources().getstring(labelres);
 } catch (namenotfoundexception e)
 {
 e.printstacktrace();
 }
 return null;
 }
 /**
 * [获取应用程序版本名称信息]
 * 
 * @param context
 * @return 当前应用的版本名称
 */
 public static string getversionname(context context)
 {
 try
 {
 packagemanager packagemanager = context.getpackagemanager();
 packageinfo packageinfo = packagemanager.getpackageinfo(
  context.getpackagename(), 0);
 return packageinfo.versionname;
 } catch (namenotfoundexception e)
 {
 e.printstacktrace();
 }
 return null;
 }
}

8、软键盘相关辅助类keyboardutils

package com.zhy.utils;

import android.content.context;
import android.view.inputmethod.inputmethodmanager;
import android.widget.edittext;
/**
 * 打开或关闭软键盘
 * 
 * @author zhy
 * 
 */
public class keyboardutils
{
 /**
 * 打卡软键盘
 * 
 * @param medittext
 *   输入框
 * @param mcontext
 *   上下文
 */
 public static void openkeybord(edittext medittext, context mcontext)
 {
 inputmethodmanager imm = (inputmethodmanager) mcontext
 .getsystemservice(context.input_method_service);
 imm.showsoftinput(medittext, inputmethodmanager.result_shown);
 imm.togglesoftinput(inputmethodmanager.show_forced,
 inputmethodmanager.hide_implicit_only);
 }
 /**
 * 关闭软键盘
 * 
 * @param medittext
 *   输入框
 * @param mcontext
 *   上下文
 */
 public static void closekeybord(edittext medittext, context mcontext)
 {
 inputmethodmanager imm = (inputmethodmanager) mcontext
 .getsystemservice(context.input_method_service);
 imm.hidesoftinputfromwindow(medittext.getwindowtoken(), 0);
 }
}

9、网络相关辅助类 netutils

package com.zhy.utils;

import android.app.activity;
import android.content.componentname;
import android.content.context;
import android.content.intent;
import android.net.connectivitymanager;
import android.net.networkinfo;
/**
 * 跟网络相关的工具类
 * 
 * 
 * 
 */
public class netutils
{
 private netutils()
 {
 /* cannot be instantiated */
 throw new unsupportedoperationexception("cannot be instantiated");
 }
 /**
 * 判断网络是否连接
 * 
 * @param context
 * @return
 */
 public static boolean isconnected(context context)
 {
 connectivitymanager connectivity = (connectivitymanager) context
 .getsystemservice(context.connectivity_service);
 if (null != connectivity)
 {
 networkinfo info = connectivity.getactivenetworkinfo();
 if (null != info && info.isconnected())
 {
 if (info.getstate() == networkinfo.state.connected)
 {
  return true;
 }
 }
 }
 return false;
 }
 /**
 * 判断是否是wifi连接
 */
 public static boolean iswifi(context context)
 {
 connectivitymanager cm = (connectivitymanager) context
 .getsystemservice(context.connectivity_service);
 if (cm == null)
 return false;
 return cm.getactivenetworkinfo().gettype() == connectivitymanager.type_wifi;
 }
 /**
 * 打开网络设置界面
 */
 public static void opensetting(activity activity)
 {
 intent intent = new intent("/");
 componentname cm = new componentname("com.android.settings",
 "com.android.settings.wirelesssettings");
 intent.setcomponent(cm);
 intent.setaction("android.intent.action.view");
 activity.startactivityforresult(intent, 0);
 }
}

10、http相关辅助类 httputils

package com.zhy.utils;

import java.io.bufferedreader;
import java.io.bytearrayoutputstream;
import java.io.ioexception;
import java.io.inputstream;
import java.io.inputstreamreader;
import java.io.printwriter;
import java.net.httpurlconnection;
import java.net.url;
/**
 * http请求的工具类
 * 
 * @author zhy
 * 
 */
public class httputils
{
 private static final int timeout_in_millions = 5000;
 public interface callback
 {
 void onrequestcomplete(string result);
 }
 /**
 * 异步的get请求
 * 
 * @param urlstr
 * @param callback
 */
 public static void dogetasyn(final string urlstr, final callback callback)
 {
 new thread()
 {
 public void run()
 {
 try
 {
  string result = doget(urlstr);
  if (callback != null)
  {
  callback.onrequestcomplete(result);
  }
 } catch (exception e)
 {
  e.printstacktrace();
 }
 };
 }.start();
 }
 /**
 * 异步的post请求
 * @param urlstr
 * @param params
 * @param callback
 * @throws exception
 */
 public static void dopostasyn(final string urlstr, final string params,
 final callback callback) throws exception
 {
 new thread()
 {
 public void run()
 {
 try
 {
  string result = dopost(urlstr, params);
  if (callback != null)
  {
  callback.onrequestcomplete(result);
  }
 } catch (exception e)
 {
  e.printstacktrace();
 }
 };
 }.start();
 }
 /**
 * get请求,获得返回数据
 * 
 * @param urlstr
 * @return
 * @throws exception
 */
 public static string doget(string urlstr) 
 {
 url url = null;
 httpurlconnection conn = null;
 inputstream is = null;
 bytearrayoutputstream baos = null;
 try
 {
 url = new url(urlstr);
 conn = (httpurlconnection) url.openconnection();
 conn.setreadtimeout(timeout_in_millions);
 conn.setconnecttimeout(timeout_in_millions);
 conn.setrequestmethod("get");
 conn.setrequestproperty("accept", "*/*");
 conn.setrequestproperty("connection", "keep-alive");
 if (conn.getresponsecode() == 200)
 {
 is = conn.getinputstream();
 baos = new bytearrayoutputstream();
 int len = -1;
 byte[] buf = new byte[128];
 while ((len = is.read(buf)) != -1)
 {
  baos.write(buf, 0, len);
 }
 baos.flush();
 return baos.tostring();
 } else
 {
 throw new runtimeexception(" responsecode is not 200 ... ");
 }
 } catch (exception e)
 {
 e.printstacktrace();
 } finally
 {
 try
 {
 if (is != null)
  is.close();
 } catch (ioexception e)
 {
 }
 try
 {
 if (baos != null)
  baos.close();
 } catch (ioexception e)
 {
 }
 conn.disconnect();
 }
 
 return null ;
 }
 /**
 * 向指定 url 发送post方法的请求
 * 
 * @param url
 *   发送请求的 url
 * @param param
 *   请求参数,请求参数应该是 name1=value1&name2=value2 的形式。
 * @return 所代表远程资源的响应结果
 * @throws exception
 */
 public static string dopost(string url, string param) 
 {
 printwriter out = null;
 bufferedreader in = null;
 string result = "";
 try
 {
 url realurl = new url(url);
 // 打开和url之间的连接
 httpurlconnection conn = (httpurlconnection) realurl
  .openconnection();
 // 设置通用的请求属性
 conn.setrequestproperty("accept", "*/*");
 conn.setrequestproperty("connection", "keep-alive");
 conn.setrequestmethod("post");
 conn.setrequestproperty("content-type",
  "application/x-www-form-urlencoded");
 conn.setrequestproperty("charset", "utf-8");
 conn.setusecaches(false);
 // 发送post请求必须设置如下两行
 conn.setdooutput(true);
 conn.setdoinput(true);
 conn.setreadtimeout(timeout_in_millions);
 conn.setconnecttimeout(timeout_in_millions);
 if (param != null && !param.trim().equals(""))
 {
 // 获取urlconnection对象对应的输出流
 out = new printwriter(conn.getoutputstream());
 // 发送请求参数
 out.print(param);
 // flush输出流的缓冲
 out.flush();
 }
 // 定义bufferedreader输入流来读取url的响应
 in = new bufferedreader(
  new inputstreamreader(conn.getinputstream()));
 string line;
 while ((line = in.readline()) != null)
 {
 result += line;
 }
 } catch (exception e)
 {
 e.printstacktrace();
 }
 // 使用finally块来关闭输出流、输入流
 finally
 {
 try
 {
 if (out != null)
 {
  out.close();
 }
 if (in != null)
 {
  in.close();
 }
 } catch (ioexception ex)
 {
 ex.printstacktrace();
 }
 }
 return result;
 }
}

总结

以上所述是小编给大家介绍的android快速开发系列 10个常用工具类实例代码详解,希望对大家有所帮助