dip转px

    public int convertDipOrPx(int dip) {          float scale = MarketApplication.getMarketApplicationContext()                  .getResources().getDisplayMetrics().density;          return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1));      }

获取当前窗体,并添加自定义view:

getWindowManager()                  .addView(                          overlay,                          new WindowManager.LayoutParams(                                  LayoutParams.WRAP_CONTENT,                                  LayoutParams.WRAP_CONTENT,                                  WindowManager.LayoutParams.TYPE_APPLICATION,                                  WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE                                          | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,                                  PixelFormat.TRANSLUCENT));  

自定义fastScrollBar图片样式：

        try {              Field f = AbsListView.class.getDeclaredField("mFastScroller");              f.setAccessible(true);              Object o = f.get(listView);              f = f.getType().getDeclaredField("mThumbDrawable");              f.setAccessible(true);              Drawable drawable = (Drawable) f.get(o);              drawable = getResources().getDrawable(R.drawable.ic_launcher);              f.set(o, drawable);              Toast.makeText(this, f.getType().getName(), 1000).show();          } catch (Exception e) {              throw new RuntimeException(e);          }

=网络==================================

判断网络是否可用：

/**    * 网络是否可用    *     * @param context    * @return    */   public static boolean isNetworkAvailable(Context context) {    ConnectivityManager mgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo[] info = mgr.getAllNetworkInfo();       if (info != null) {        for (int i = 0; i < info.length; i++) {         if (info[i].getState() == NetworkInfo.State.CONNECTED) {          return true;         }        }       }    return false;   }

方法二：

    /*       * 判断网络连接是否已开 2012-08-20true 已打开 false 未打开       */      public static boolean isConn(Context context) {          boolean bisConnFlag = false;          ConnectivityManager conManager = (ConnectivityManager) context                  .getSystemService(Context.CONNECTIVITY_SERVICE);          NetworkInfo network = conManager.getActiveNetworkInfo();          if (network != null) {              bisConnFlag = conManager.getActiveNetworkInfo().isAvailable();          }          return bisConnFlag;      }

判断是不是Wifi连接：

    public static boolean isWifiActive(Context icontext) {          Context context = icontext.getApplicationContext();          ConnectivityManager connectivity = (ConnectivityManager) context                  .getSystemService(Context.CONNECTIVITY_SERVICE);          NetworkInfo[] info;          if (connectivity != null) {              info = connectivity.getAllNetworkInfo();              if (info != null) {                  for (int i = 0; i < info.length; i++) {                      if (info[i].getTypeName().equals("WIFI")                              && info[i].isConnected()) {                          return true;                      }                  }              }          }          return false;      }

判断当前网络类型

/**    * 网络方式检查    */   private static int netCheck(Context context) {    ConnectivityManager conMan = (ConnectivityManager) context      .getSystemService(Context.CONNECTIVITY_SERVICE);    State mobile = conMan.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)      .getState();    State wifi = conMan.getNetworkInfo(ConnectivityManager.TYPE_WIFI)      .getState();    if (wifi.equals(State.CONNECTED)) {     return DO_WIFI;    } else if (mobile.equals(State.CONNECTED)) {     return DO_3G;    } else {     return NO_CONNECTION;    }   }

获取下载文件的真实名字

    public String getReallyFileName(String url) {          StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()                  .detectDiskReads().detectDiskWrites().detectNetwork() // 这里可以替换为detectAll()                                                                        // 就包括了磁盘读写和网络I/O                  .penaltyLog() // 打印logcat，当然也可以定位到dropbox，通过文件保存相应的log                  .build());          StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()                  .detectLeakedSqlLiteObjects() // 探测SQLite数据库操作                  .penaltyLog() // 打印logcat                  .penaltyDeath().build());            String filename = "";          URL myURL;          HttpURLConnection conn = null;          if (url == null || url.length() < 1) {              return null;          }            try {              myURL = new URL(url);              conn = (HttpURLConnection) myURL.openConnection();              conn.connect();              conn.getResponseCode();              URL absUrl = conn.getURL();// 获得真实Url              // 打印输出服务器Header信息              // Map<String, List<String>> map = conn.getHeaderFields();              // for (String str : map.keySet()) {              // if (str != null) {              // Log.e("H3c", str + map.get(str));              // }              // }              filename = conn.getHeaderField("Content-Disposition");// 通过Content-Disposition获取文件名，这点跟服务器有关，需要灵活变通              if (filename == null || filename.length() < 1) {                  filename = URLDecoder.decode(absUrl.getFile(), "UTF-8");              }          } catch (MalformedURLException e) {              e.printStackTrace();          } catch (IOException e) {              e.printStackTrace();          } finally {              if (conn != null) {                  conn.disconnect();                  conn = null;              }          }            return filename;      }

=图片==========================

bitmap转Byte数组(微信分享就需要用到)

public byte[] bmpToByteArray(final Bitmap bmp, final boolean needRecycle) {          ByteArrayOutputStream output = new ByteArrayOutputStream();          bmp.compress(CompressFormat.PNG, 100, output);          if (needRecycle) {              bmp.recycle();          }            byte[] result = output.toByteArray();          try {              output.close();          } catch (Exception e) {              e.printStackTrace();          }            return result;      }

public Bitmap loadBitmap(Resources res, int id) {          BitmapFactory.Options opt = new BitmapFactory.Options();          opt.inPreferredConfig = Bitmap.Config.RGB_565;          opt.inPurgeable = true;          opt.inInputShareable = true;            InputStream is = res.openRawResource(id);// 获取资源图片          return BitmapFactory.decodeStream(is, null, opt);      }

public void saveBitmapToFile(String url, String filePath) {          File iconFile = new File(filePath);          if (!iconFile.getParentFile().exists()) {              iconFile.getParentFile().mkdirs();          }            if (iconFile.exists() && iconFile.length() > 0) {              return;          }            FileOutputStream fos = null;          InputStream is = null;          try {              fos = new FileOutputStream(filePath);              is = new URL(url).openStream();                int data = is.read();              while (data != -1) {                  fos.write(data);                  data = is.read();              }          } catch (IOException e) {              e.printStackTrace();          } finally {              try {                  if (is != null) {                      is.close();                  }                  if (fos != null) {                      fos.close();                  }              } catch (IOException e) {                  e.printStackTrace();              }          }      }

=系统==============================

根据包名打开一个应用程序

    public boolean openApp(String packageName) {          PackageInfo pi = null;          try {              pi = mPM.getPackageInfo(packageName, 0);          } catch (NameNotFoundException e) {              e.printStackTrace();              return false;          }            if (pi == null) {              return false;          }            Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);          resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);          resolveIntent.setPackage(pi.packageName);            List<ResolveInfo> apps = mPM.queryIntentActivities(resolveIntent, 0);            ResolveInfo ri = null;          try {              ri = apps.iterator().next();          } catch (Exception e) {              return true;          }          if (ri != null) {              String tmpPackageName = ri.activityInfo.packageName;              String className = ri.activityInfo.name;                Intent intent = new Intent(Intent.ACTION_MAIN);              intent.addCategory(Intent.CATEGORY_LAUNCHER);                ComponentName cn = new ComponentName(tmpPackageName, className);                intent.setComponent(cn);              intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);              MarketApplication.getMarketApplicationContext().startActivity(                      intent);          } else {              return false;          }          return true;      }

判断是否APK是否安装过

public boolean checkApkExist(Context context, String packageName) {          if (packageName == null || "".equals(packageName))              return false;          try {              ApplicationInfo info = context.getPackageManager()                      .getApplicationInfo(packageName,                              PackageManager.GET_UNINSTALLED_PACKAGES);              return true;          } catch (NameNotFoundException e) {              return false;          } catch (NullPointerException e) {              return false;          }      }

安装APK

    public void installApk(Context context, String strFileAllName) {          File file = new File(strFileAllName);          Intent intent = new Intent();          intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);          intent.setAction(Intent.ACTION_VIEW);          String type = "application/vnd.android.package-archive";          intent.setDataAndType(Uri.fromFile(file), type);          context.startActivity(intent);      }

卸载APK

    public void UninstallApk(Context context, String strPackageName) {          Uri packageURI = Uri.parse("package:" + strPackageName);          Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);          context.startActivity(uninstallIntent);      }

判断SD卡是否可用

    public boolean CheckSD() {          if (android.os.Environment.getExternalStorageState().equals(                  android.os.Environment.MEDIA_MOUNTED)) {              return true;          } else {              return false;          }      }

创建快捷方式：

    public void createShortCut(Context contxt) {          // if (isInstallShortcut()) {// 如果已经创建了一次就不会再创建了          // return;          // }            Intent sIntent = new Intent(Intent.ACTION_MAIN);          sIntent.addCategory(Intent.CATEGORY_LAUNCHER);// 加入action,和category之后，程序卸载的时候才会主动将该快捷方式也卸载          sIntent.setClass(contxt, Login.class);            Intent installer = new Intent();          installer.putExtra("duplicate", false);          installer.putExtra("android.intent.extra.shortcut.INTENT", sIntent);          installer.putExtra("android.intent.extra.shortcut.NAME", "名字");          installer.putExtra("android.intent.extra.shortcut.ICON_RESOURCE",                  Intent.ShortcutIconResource                          .fromContext(contxt, R.drawable.icon));          installer.setAction("com.android.launcher.action.INSTALL_SHORTCUT");          contxt.sendBroadcast(installer);      }

判断快捷方式是否创建：

private boolean isInstallShortcut() {          boolean isInstallShortcut = false;          final ContentResolver cr = MarketApplication                  .getMarketApplicationContext().getContentResolver();          String AUTHORITY = "com.android.launcher.settings";          Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY                  + "/favorites?notify=true");            Cursor c = cr.query(CONTENT_URI,                  new String[] { "title", "iconResource" }, "title=?",                  new String[] { "名字" }, null);          if (c != null && c.getCount() > 0) {              isInstallShortcut = true;          }            if (c != null) {              c.close();          }            if (isInstallShortcut) {              return isInstallShortcut;          }            AUTHORITY = "com.android.launcher2.settings";          CONTENT_URI = Uri.parse("content://" + AUTHORITY                  + "/favorites?notify=true");          c = cr.query(CONTENT_URI, new String[] { "title", "iconResource" },                  "title=?", new String[] { "名字" }, null);          if (c != null && c.getCount() > 0) {              isInstallShortcut = true;          }            if (c != null) {              c.close();          }            AUTHORITY = "com.baidu.launcher";          CONTENT_URI = Uri.parse("content://" + AUTHORITY                  + "/favorites?notify=true");          c = cr.query(CONTENT_URI, new String[] { "title", "iconResource" },                  "title=?", new String[] { "名字" }, null);          if (c != null && c.getCount() > 0) {              isInstallShortcut = true;          }            if (c != null) {              c.close();          }            return isInstallShortcut;      }

过滤特殊字符：

    private String StringFilter(String str) throws PatternSyntaxException {          // 只允许字母和数字          // String regEx = "[^a-zA-Z0-9]";          // 清除掉所有特殊字符          String regEx = "[`~!@#$%^&*()+=|{}':;',//[//].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？]";          Pattern p = Pattern.compile(regEx);          Matcher m = p.matcher(str);          return m.replaceAll("").trim();      }

执行shell语句：

    public int execRootCmdSilent(String cmd) {          int result = -1;          DataOutputStream dos = null;            try {              Process p = Runtime.getRuntime().exec("su");              dos = new DataOutputStream(p.getOutputStream());              dos.writeBytes(cmd + "\n");              dos.flush();              dos.writeBytes("exit\n");              dos.flush();              p.waitFor();              result = p.exitValue();          } catch (Exception e) {              e.printStackTrace();          } finally {              if (dos != null) {                  try {                      dos.close();                  } catch (IOException e) {                      e.printStackTrace();                  }              }          }          return result;      }

获得文件MD5值：

    public String getFileMD5(File file) {          if (!file.isFile()) {              return null;          }            MessageDigest digest = null;          FileInputStream in = null;          byte buffer[] = new byte[1024];          int len;          try {              digest = MessageDigest.getInstance("MD5");              in = new FileInputStream(file);              while ((len = in.read(buffer, 0, 1024)) != -1) {                  digest.update(buffer, 0, len);              }          } catch (Exception e) {              e.printStackTrace();              return null;          } finally {              if (in != null) {                  try {                      in.close();                  } catch (IOException e) {                      e.printStackTrace();                  }              }          }          BigInteger bigInt = new BigInteger(1, digest.digest());          return bigInt.toString(16);      }