Android 常见工具类封装

1，MD5工具类：

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"));
    }
}

2，线程睡眠

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();
    }
}

3，检查网络是否连通

/**
     * 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;
    }

4，异常类捕捉

/**
 * 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();
            }
        }
    }
}

5，图片API类

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;
    }

}

6，提醒封装类

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();
    }