android常用的工具类

1.设备相关的工具类DeviceUtil(获取屏幕大小，状态栏高度，键盘操作，版本号，dip与px转化）

public class DeviceUtil{
   /**
    * 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;

    /**
     * 该方法用于将dip大小转换为px大小
     */
   public static int dip2px(Context context, float dipValue) {
   	final float scale = context.getResources().getDisplayMetrics().density;
   	return (int) (dipValue * scale + 0.5f);
  }
  /**
    * 该方法用于将px大小转换为dip大小
    */
   public static int px2dip(Context context, float pxValue) {
   	final float scale = context.getResources().getDisplayMetrics().density;
   	return (int) (pxValue / scale + 0.5f);
   }

   /**
    * 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;
  }

    /**
     * 打开键盘.
     *
     * @param context the context
     */
    public static void showSoftInput(Context context) {
        InputMethodManager inputMethodManager = (InputMethodManager) context
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        inputMethodManager.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
    }

    /**
     * 关闭键盘事件.
     *
     * @param context the context
     */
    public static void closeSoftInput(Context context) {
        InputMethodManager inputMethodManager = (InputMethodManager) context
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        if (inputMethodManager != null && ((Activity) context).getCurrentFocus() != null) {
            inputMethodManager.hideSoftInputFromWindow(((Activity) context).getCurrentFocus()
                    .getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
        }
    }

    /**
     * 获取当前版本号
     * @return
     * @throws Exception
     */
    public static String getVersionName(Context context) {
        StringBuilder builder = new StringBuilder("v");
        try {
            PackageInfo packInfo = getPackageInfo(context);
            builder.append(packInfo.versionName);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return builder.toString();
    }

    /**
     * 是否存在该包名的应用
     * @param context
     * @return
     */
    public static boolean exitAppBy(Context context, String packageName) {
        final PackageManager packageManager = context.getPackageManager();
        List packageInfos= packageManager.getInstalledPackages(0);// 获取所有已安装程序的包信息
        if (packageInfos!= null) {
            for (int i = 0; i < pinfo.size(); i++) {
                String pn = packageInfos.get(i).packageName;
                if (pn.equals(packageName)) {
                    return true;
                }
            }
        }
        return false;
    }

2.LogUtil

public class LogUtil {
   private static final boolean DEBUG = false;

   public static void i(String tag, String msg) {
      if (DEBUG) {
         Log.i(tag, msg);
      }
   }

   public static void e(String tag, String msg) {
      if (DEBUG) {
         Log.e(tag, msg);

      }
   }

   public static void d(String tag, String msg) {
      if (DEBUG) {
         Log.d(tag, msg);

      }
   }

   public static void w(String tag, String msg) {
      if (DEBUG) {
         Log.w(tag, msg);

      }
   }

   public static void v(String tag, String msg) {
      if (DEBUG) {
         Log.v(tag, msg);

      }
   }

3.加密MD5Util

public class MD5Util {
     public static String md5(String str) {
      if (str == null) {
         return null;
      }
      return md5(str, "utf-8");
   }

   public static String md5(String str, String encodingType) {
      MessageDigest md5 = null;
      try {
         md5 = MessageDigest.getInstance("MD5");
      } catch (Exception e) {
         e.printStackTrace();
         return null;
      }

      try {
         md5.update(str.getBytes(encodingType));
      } catch (UnsupportedEncodingException e) {
         md5.update(str.getBytes());
      }

      byte[] md5Bytes = md5.digest();

      StringBuffer hexValue = new StringBuffer();
      for (int i = 0; i < md5Bytes.length; i++) {
         int val = ((int) md5Bytes[i]) & 0xff;
         if (val < 16) {
            hexValue.append("0");
         }
         hexValue.append(Integer.toHexString(val));
      }
      return hexValue.toString();
   }
}

4.偏好缓存SPUtil

public class SPUtil {
   private static final String name="sp_data";
   
   public static SharedPreferences getDefaultSharedPreferences(Context context) {
      return context.getSharedPreferences(name, Context.MODE_PRIVATE);
   }
   
   public static void putInt(Context context,String key, int value) {
      SharedPreferences sharedPreferences = getDefaultSharedPreferences(context);
      SharedPreferences.Editor edit = sharedPreferences.edit();
      edit.putInt(key, value);
      edit.commit();
   }
   
   public static int getInt(Context context,String key) {
      SharedPreferences sharedPreferences = getDefaultSharedPreferences(context);
      return sharedPreferences.getInt(key, 0);
   }
   
   public static void putString(Context context,String key, String value) {
      SharedPreferences sharedPreferences = getDefaultSharedPreferences(context);
      SharedPreferences.Editor edit = sharedPreferences.edit();
      edit.putString(key, value);
      edit.commit();
   }
   
   public static String getString(Context context,String key) {
      SharedPreferences sharedPreferences = getDefaultSharedPreferences(context);
      return sharedPreferences.getString(key,null);
   }
   
   public static void putBoolean(Context context,String key, boolean value) {
      SharedPreferences sharedPreferences = getDefaultSharedPreferences(context);
      SharedPreferences.Editor edit = sharedPreferences.edit();
      edit.putBoolean(key, value);
      edit.commit();
   }
   
   public static boolean getBoolean(Context context,String key,boolean defValue) {
      SharedPreferences sharedPreferences = getDefaultSharedPreferences(context);
      return sharedPreferences.getBoolean(key,defValue);
   }
}