Android 常见工具类封装

傷城~ 2022-06-17 12:29 179阅读 0赞

1，MD5工具类：

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public class MD5Util {
        public final static String MD5(String s) {
            char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                    'a', 'b', 'c', 'd', 'e', 'f' };
            try {
                byte[] btInput = s.getBytes();
                // 获得MD5摘要算法的 MessageDigest 对象
                MessageDigest mdInst = MessageDigest.getInstance("MD5");
                // 使用指定的字节更新摘要
                mdInst.update(btInput);
                // 获得密文
                byte[] md = mdInst.digest();
                // 把密文转换成十六进制的字符串形式
                int j = md.length;
                char str[] = new char[j * 2];
                int k = 0;
                for (int i = 0; i < j; i++) {
                    byte byte0 = md[i];
                    str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                    str[k++] = hexDigits[byte0 & 0xf];
                }
                return new String(str);
            } catch (Exception e) {
                return null;
            }
        }
    
        public static void main(String[] args) {
            System.out.print(MD5Util.MD5("password"));
        }
    }

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2，线程睡眠

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public class CSleep {
        public static final long DEFAULT_SLEEP_TIME = 500;
    
        private boolean          isRuning           = false;
    
        public boolean isRuning() {
            return isRuning;
        }
    
        public void runWithTime(final long defaultSleepTime) {
            isRuning = true;
            new Thread() {
    
                @Override
                public void run() {
                    try {
                        sleep(defaultSleepTime, 0);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    isRuning = false;
                    super.run();
                }
            }.start();
        }
    }

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3，检查网络是否连通

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/**
         * 检查网络是否连通
         * 
         * @return boolean
         * @since V1.0
         */
        public boolean isNetworkAvailable(Context context) {
            // 创建并初始化连接对象
            ConnectivityManager connMan = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            // 判断初始化是否成功并作出相应处理
            if (connMan != null) {
                // 调用getActiveNetworkInfo方法创建对象,如果不为空则表明网络连通，否则没连通
                NetworkInfo info = connMan.getActiveNetworkInfo();
                if (info != null) {
                    return info.isAvailable();
                }
            }
            return false;
        }

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4，异常类捕捉

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/**
     * UncaughtException处理类,当程序发生Uncaught异常的时候,由该类来接管程序,并记录发送错误报告. 需要在Application中注册，为了要在程序启动器就监控整个程序。
     */
    public class CrashHandler implements UncaughtExceptionHandler {
        /** TAG */
        public static final String              TAG       = "CrashHandler";
        /** 系统默认的UncaughtException处理类 */
        private Thread.UncaughtExceptionHandler mDefaultHandler;
        /** CrashHandler实例 */
        private static CrashHandler             mCrashHandler;
        /** 程序的Context对象 */
        private Context                         mContext;
        /** 用来存储设备信息和异常信息 */
        private Map<String, String>             infos     = new HashMap<String, String>();
        /** 用于格式化日期,作为日志文件名的一部分 */
        private DateFormat                      formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
    
        /**
         * 私有构造函数
         */
        private CrashHandler() {
    
        }
    
        /**
         * 获取CrashHandler实例 ,单例模式
         * 
         * @return
         * @since V1.0
         */
        public static CrashHandler getInstance() {
            if (mCrashHandler == null)
                mCrashHandler = new CrashHandler();
            return mCrashHandler;
        }
    
        /**
         * 初始化
         * 
         * @param context
         * @since V1.0
         */
        public void init(Context context) {
            mContext = context;
            // 获取系统默认的UncaughtException处理器
            mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
            // 设置该CrashHandler为程序的默认处理器
            Thread.setDefaultUncaughtExceptionHandler(this);
        }
    
        /**
         * 当UncaughtException发生时会转入该函数来处理
         */
        @Override
        public void uncaughtException(Thread thread, Throwable ex) {
            if (!handleException(ex) && mDefaultHandler != null) {
                // 如果用户没有处理则让系统默认的异常处理器来处理
                mDefaultHandler.uncaughtException(thread, ex);
            } else {
                try {
                    Thread.sleep(3000);
                } catch (InterruptedException e) {
                    CLog.e(TAG, "uncaughtException() InterruptedException:" + e);
                }
                // 退出程序
                android.os.Process.killProcess(android.os.Process.myPid());
                System.exit(1);
            }
        }
    
        /**
         * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
         * 
         * @param ex
         * @return true:如果处理了该异常信息;否则返回false.
         * @since V1.0
         */
        private boolean handleException(Throwable ex) {
            if (ex == null) {
                return false;
            }
    
            // 收集设备参数信息
            collectDeviceInfo(mContext);
    
            // 使用Toast来显示异常信息
            new Thread() {
                @Override
                public void run() {
                    Looper.prepare();
                    Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_SHORT).show();
                    Looper.loop();
                }
            }.start();
    
            // 保存日志文件
            saveCatchInfo2File(ex);
            return true;
        }
    
        /**
         * 收集设备参数信息
         * 
         * @param ctx
         * @since V1.0
         */
        public void collectDeviceInfo(Context ctx) {
            try {
                PackageManager pm = ctx.getPackageManager();
                PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
                if (pi != null) {
                    String versionName = pi.versionName == null ? "null" : pi.versionName;
                    String versionCode = pi.versionCode + "";
                    infos.put("versionName", versionName);
                    infos.put("versionCode", versionCode);
                }
            } catch (NameNotFoundException e) {
                CLog.e(TAG, "collectDeviceInfo() an error occured when collect package info NameNotFoundException:", e);
            }
            Field[] fields = Build.class.getDeclaredFields();
            for (Field field : fields) {
                try {
                    field.setAccessible(true);
                    infos.put(field.getName(), field.get(null).toString());
                    CLog.d(TAG, field.getName() + " : " + field.get(null));
                } catch (Exception e) {
                    CLog.e(TAG, "collectDeviceInfo() an error occured when collect crash info Exception:", e);
                }
            }
        }
    
        /**
         * 保存错误信息到文件中
         * 
         * @param ex
         * @return 返回文件名称,便于将文件传送到服务器
         */
        private String saveCatchInfo2File(Throwable ex) {
            StringBuffer sb = new StringBuffer();
            for (Map.Entry<String, String> entry : infos.entrySet()) {
                String key = entry.getKey();
                String value = entry.getValue();
                sb.append(key + "=" + value + "\n");
            }
    
            Writer writer = new StringWriter();
            PrintWriter printWriter = new PrintWriter(writer);
            ex.printStackTrace(printWriter);
            Throwable cause = ex.getCause();
            while (cause != null) {
                cause.printStackTrace(printWriter);
                cause = cause.getCause();
            }
            printWriter.close();
            String result = writer.toString();
            sb.append(result);
            try {
                long timestamp = System.currentTimeMillis();
                String time = formatter.format(new Date());
                String fileName = "crash-" + time + "-" + timestamp + ".log";
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                    String path = FilePathUtil.getiVMSDirPath() + "/crash/";
                    File dir = new File(path);
                    if (!dir.exists()) {
                        dir.mkdirs();
                    }
                    FileOutputStream fos = new FileOutputStream(path + fileName);
                    fos.write(sb.toString().getBytes());
                    // 发送给开发人员
                    sendCrashLog2PM(path + fileName);
                    fos.close();
                }
                return fileName;
            } catch (Exception e) {
                CLog.e(TAG, "saveCatchInfo2File() an error occured while writing file... Exception:", e);
            }
            return null;
        }
    
        /**
         * 将捕获的导致崩溃的错误信息发送给开发人员 目前只将log日志保存在sdcard 和输出到LogCat中，并未发送给后台。
         * 
         * @param fileName
         * @since V1.0
         */
        private void sendCrashLog2PM(String fileName) {
            if (!new File(fileName).exists()) {
                CLog.e(TAG, "sendCrashLog2PM() 日志文件不存在");
                return;
            }
            FileInputStream fis = null;
            BufferedReader reader = null;
            String s = null;
            try {
                fis = new FileInputStream(fileName);
                reader = new BufferedReader(new InputStreamReader(fis, "GBK"));
                while (true) {
                    s = reader.readLine();
                    if (s == null)
                        break;
                    // 由于目前尚未确定以何种方式发送，所以先打出log日志。
                    CLog.e(TAG, s);
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally { // 关闭流
                try {
                    reader.close();
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

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5，弹出框提醒

public static Dialog showDialog(Context ctx, int layViewID, int ThemeType) {
            Dialog res = new Dialog(ctx, ThemeType);
            res.setContentView(layViewID);
            return res;
        }

6，图片API类

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public class ImageAPI {
    
        public static Bitmap getImageByFilePath(String filePath, int scale) {
            Bitmap res = null;
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(filePath, options);
            options.inJustDecodeBounds = false;
            options.inSampleSize = scale;
            options.inPreferredConfig = Bitmap.Config.ARGB_4444;
            return res;
        }
    
        public static Bitmap getImageByFilePath(String filePath, int Towidth, int ToHeight) {
            Bitmap res = null;
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            if (!new File(filePath).exists())
                return res;
            BitmapFactory.decodeFile(filePath, options);
    
            int origionalWidth = options.outHeight;
            int origionalHeight = options.outWidth;
            options.inJustDecodeBounds = false;
            int scale = Math.max(origionalWidth / Towidth, origionalHeight / ToHeight);
            options.inSampleSize = scale;
            options.inPreferredConfig = Bitmap.Config.ARGB_4444;
            try {
                res = BitmapFactory.decodeFile(filePath, options);
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            } catch (OutOfMemoryError e) {
                e.printStackTrace();
                return null;
            }
            return res;
        }
    
    }

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10，提醒封装类

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public static void showToast(Context ctx, int id, String str) {
            if (str == null) {
                return;
            }
    
            Toast toast = Toast.makeText(ctx, ctx.getString(id) + str, Toast.LENGTH_SHORT);
            toast.setGravity(Gravity.CENTER, 0, 0);
            toast.show();
        }
    
        public static void showToast(Context ctx, String errInfo) {
            if (errInfo == null) {
                return;
            }
    
            Toast toast = Toast.makeText(ctx, errInfo, Toast.LENGTH_SHORT);
            toast.setGravity(Gravity.CENTER, 0, 0);
            toast.show();
        }

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[copycode.gif]: /images/20220617/3f8e3bd606d340be89141c05cbf1e5ee.png