Android快速开发系列 10个常用工具类

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原文地址:Android快速开发系列 10个常用工具类

参考地址:github总结1

参考地址:Android项目中常用的工具类集(史上最全整理)


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);      }  }  


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();      }    }  



3、SharedPreferences封装类SPUtils


键值对的形式存储。


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~~


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();          }      }    }  
这两个方法的区别在于: 
1. apply没有返回值而commit返回boolean表明修改是否提交成功 
2. apply是将修改数据原子提交到内存, 而后异步真正提交到硬件磁盘, 而commit是同步的提交到硬件磁盘,因此,在多个并发的提交commit的时候,他们会等待正在处理的commit保存到磁盘后在操作,从而降低了效率。而apply只是原子的提交到内容,后面有调用apply的函数的将会直接覆盖前面的内存数据,这样从一定程度上提高了很多效率。 
3. apply方法不会提示任何失败的提示。 
由于在一个进程中,sharedPreference是单实例,一般不会出现并发冲突,如果对提交的结果不关心的话,建议使用apply,当然需要确保提交成功且有后续操作的话,还是需要用commit的。


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;      }  }  






















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