Android 工具类大全

转载请标明出处：http://blog.csdn.net/lmj623565791/article/details/38965311

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~~

 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);
     }

 }