Android快速开发系列 10个常用工具类实例代码详解
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