今天在网上找的一个Android开发工具类集合，搬运到这里分享给大家，希望能够对大家有所帮助。

AppUtils

这是一个用于获取程序版本信息，程序名称的工具类

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;}}

DensityUtils

这个工具类主要用来做Android设备屏幕的单位转化

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);}}

HttpUtils

用于进行网络请求的工具类，可进行get，post两种请求，值得一提的是这个utils给大家提供了一个回调接口，方便获取下载文件的进度

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;}}

KeyboardUtils

这是一个键盘输入法相关的工具类，用于打开/关闭软键盘

import android.content.Context;import android.view.inputmethod.InputMethodManager;import android.widget.EditText;//打开或关闭软键盘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);}}

LogUtils

对Logcat的一个封装工具类

import android.util.Log;//Logcat统一管理类public class LogUtils{private LogUtils(){/* 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);}}

今天，Android不可或缺的开发工具类集合的分享就到这里，后续会更新。续篇地址：Android开发：Android快速开发不可或缺的11个工具类（二）

本文转载自：http://www.devstore.cn/code/info/363.htm

如无特殊说明，文章均为xiong_it原创，本文链接：http://blog.csdn.net/xiong_it/article/details/45969759。

Android开发：Android快速开发不可或缺的11个工具类（一）

AppUtils

DensityUtils

HttpUtils

KeyboardUtils

LogUtils

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Android开发：Android快速开发不可或缺的11个工具类 （一）

AppUtils

DensityUtils

HttpUtils

KeyboardUtils

LogUtils

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Android开发：Android快速开发不可或缺的11个工具类（一）