android 經常使用工具

轉載請標明出處：http://blog.csdn.net/lmj623565791/article/details/38965311，本文出自【張鴻洋的博客】

打開你們手上的項目，基本都會有一大批的輔助類，今天特此整理出10個基本每一個項目中都會使用的工具類，用於快速開發~~

在此感謝羣裏給我發項目中工具類的兄弟/姐妹~

一、日誌工具類L.java

 

package com.zhy.utils;

import android.util.Log;

/**
 * Log統一管理類
 *
 *
 *
 */
public class L
{

    private L()
    {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    public static boolean isDebug = true;// 是否須要打印bug，能夠在application的onCreate函數裏面初始化
    private static final String TAG = "way";

    // 下面四個是默認tag的函數
    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);
    }

    // 下面是傳入自定義tag的函數
    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);
    }
}

 

網上看到的類，註釋上應該原創做者的名字，很簡單的一個類；網上也有不少提供把日誌記錄到SDCard上的，不過我是歷來沒記錄過，因此引入個最簡單的，你們能夠進行評價是否須要擴充~~

二、Toast統一管理類 

 

package com.zhy.utils;

import android.content.Context;
import android.widget.Toast;

/**
 * Toast統一管理類
 *
 */
public class T
{

    private T()
    {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    public static boolean isShow = true;

    /**
     * 短期顯示Toast
     *
     * @param context
     * @param message
     */
    public static void showShort(Context context, CharSequence message)
    {
        if (isShow)
            Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
    }

    /**
     * 短期顯示Toast
     *
     * @param context
     * @param message
     */
    public static void showShort(Context context, int message)
    {
        if (isShow)
            Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
    }

    /**
     * 長時間顯示Toast
     *
     * @param context
     * @param message
     */
    public static void showLong(Context context, CharSequence message)
    {
        if (isShow)
            Toast.makeText(context, message, Toast.LENGTH_LONG).show();
    }

    /**
     * 長時間顯示Toast
     *
     * @param context
     * @param message
     */
    public static void showLong(Context context, int message)
    {
        if (isShow)
            Toast.makeText(context, message, Toast.LENGTH_LONG).show();
    }

    /**
     * 自定義顯示Toast時間
     *
     * @param context
     * @param message
     * @param duration
     */
    public static void show(Context context, CharSequence message, int duration)
    {
        if (isShow)
            Toast.makeText(context, message, duration).show();
    }

    /**
     * 自定義顯示Toast時間
     *
     * @param context
     * @param message
     * @param duration
     */
    public static void show(Context context, int message, int duration)
    {
        if (isShow)
            Toast.makeText(context, message, duration).show();
    }

}

 

也是很是簡單的一個封裝，能省則省了~~

三、SharedPreferences封裝類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
{
    /**
     * 保存在手機裏面的文件名
     */
    public static final String FILE_NAME = "share_data";

    /**
     * 保存數據的方法，咱們須要拿到保存數據的具體類型，而後根據類型調用不一樣的保存方法
     *
     * @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);
    }

    /**
     * 獲得保存數據的方法，咱們根據默認值獲得保存的數據的具體類型，而後調用相對於的方法獲取值
     *
     * @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;
    }

    /**
     * 移除某個key值已經對應的值
     * @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);
    }

    /**
     * 清除全部數據
     * @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);
    }

    /**
     * 查詢某個key是否已經存在
     * @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);
    }

    /**
     * 返回全部的鍵值對
     *
     * @param context
     * @return
     */
    public static Map<String, ?> getAll(Context context)
    {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
                Context.MODE_PRIVATE);
        return sp.getAll();
    }

    /**
     * 建立一個解決SharedPreferencesCompat.apply方法的一個兼容類
     *
     * @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;
        }

        /**
         * 若是找到則使用apply執行，不然使用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();
        }
    }

}

對SharedPreference的使用作了建議的封裝，對外公佈出put，get，remove，clear等等方法；

 

注意一點，裏面全部的commit操做使用了SharedPreferencesCompat.apply進行了替代，目的是儘量的使用apply代替commit

首先說下爲何，由於commit方法是同步的，而且咱們不少時候的commit操做都是UI線程中，畢竟是IO操做，儘量異步；

因此咱們使用apply進行替代，apply異步的進行寫入；

可是apply至關於commit來講是new API呢，爲了更好的兼容，咱們作了適配；

SharedPreferencesCompat也能夠給你們建立兼容類提供了必定的參考~~

 

四、單位轉換類 DensityUtils

 

package com.zhy.utils;

import android.content.Context;
import android.util.TypedValue;

/**
 * 經常使用單位轉換的輔助類
 *
 *
 *
 */
public class DensityUtils
{
    private DensityUtils()
    {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * dp轉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轉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轉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轉sp
     *
     * @param fontScale
     * @param pxVal
     * @return
     */
    public static float px2sp(Context context, float pxVal)
    {
        return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
    }

}

 

五、SD卡相關輔助類 SDCardUtils

package com.zhy.utils;

import java.io.File;

import android.os.Environment;
import android.os.StatFs;

/**
 * SD卡相關的輔助類
 *
 *
 *
 */
public class SDCardUtils
{
    private SDCardUtils()
    {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * 判斷SDCard是否可用
     *
     * @return
     */
    public static boolean isSDCardEnable()
    {
        return Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED);

    }

    /**
     * 獲取SD卡路徑
     *
     * @return
     */
    public static String getSDCardPath()
    {
        return Environment.getExternalStorageDirectory().getAbsolutePath()
                + File.separator;
    }

    /**
     * 獲取SD卡的剩餘容量 單位byte
     *
     * @return
     */
    public static long getSDCardAllSize()
    {
        if (isSDCardEnable())
        {
            StatFs stat = new StatFs(getSDCardPath());
            // 獲取空閒的數據塊的數量
            long availableBlocks = (long) stat.getAvailableBlocks() - 4;
            // 獲取單個數據塊的大小（byte）
            long freeBlocks = stat.getAvailableBlocks();
            return freeBlocks * availableBlocks;
        }
        return 0;
    }

    /**
     * 獲取指定路徑所在空間的剩餘可用容量字節數，單位byte
     *
     * @param filePath
     * @return 容量字節 SDCard可用空間，內部存儲可用空間
     */
    public static long getFreeBytes(String filePath)
    {
        // 若是是sd卡的下的路徑，則獲取sd卡可用容量
        if (filePath.startsWith(getSDCardPath()))
        {
            filePath = getSDCardPath();
        } else
        {// 若是是內部存儲的路徑，則獲取內存存儲的可用容量
            filePath = Environment.getDataDirectory().getAbsolutePath();
        }
        StatFs stat = new StatFs(filePath);
        long availableBlocks = (long) stat.getAvailableBlocks() - 4;
        return stat.getBlockSize() * availableBlocks;
    }

    /**
     * 獲取系統存儲路徑
     *
     * @return
     */
    public static String getRootDirectoryPath()
    {
        return Environment.getRootDirectory().getAbsolutePath();
    }


}

 

 

六、屏幕相關輔助類 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;

/**
 * 得到屏幕相關的輔助類
 *
 *
 *
 */
public class ScreenUtils
{
    private ScreenUtils()
    {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * 得到屏幕高度
     *
     * @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;
    }

    /**
     * 得到屏幕寬度
     *
     * @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;
    }

    /**
     * 得到狀態欄的高度
     *
     * @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;
    }

    /**
     * 獲取當前屏幕截圖，包含狀態欄
     *
     * @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;

    }

    /**
     * 獲取當前屏幕截圖，不包含狀態欄
     *
     * @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;

    }

}

 

七、App相關輔助類

 

 

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相關的輔助類
 *
 *
 *
 */
public class AppUtils
{

    private AppUtils()
    {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");

    }

    /**
     * 獲取應用程序名稱
     */
    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;
    }

    /**
     * [獲取應用程序版本名稱信息]
     *
     * @param context
     * @return 當前應用的版本名稱
     */
    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;
    }

}

 

八、軟鍵盤相關輔助類KeyBoardUtils

 

 

package com.zhy.utils;

import android.content.Context;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;

/**
 * 打開或關閉軟鍵盤
 *
 * @author zhy
 *
 */
public class KeyBoardUtils
{
    /**
     * 打卡軟鍵盤
     *
     * @param mEditText
     *            輸入框
     * @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);
    }

    /**
     * 關閉軟鍵盤
     *
     * @param mEditText
     *            輸入框
     * @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);
    }
}

 

九、網絡相關輔助類 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;

/**
 * 跟網絡相關的工具類
 *
 *
 *
 */
public class NetUtils
{
    private NetUtils()
    {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * 判斷網絡是否鏈接
     *
     * @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;
    }

    /**
     * 判斷是不是wifi鏈接
     */
    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;

    }

    /**
     * 打開網絡設置界面
     */
    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);
    }

}

 

 

十、Http相關輔助類 HttpUtils

package com.zhy.utils;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Http請求的工具類
 *
 * @author zhy
 *
 */
public class HttpUtils
{

    private static final int TIMEOUT_IN_MILLIONS = 5000;

    public interface CallBack
    {
        void onRequestComplete(String result);
    }


    /**
     * 異步的Get請求
     *
     * @param urlStr
     * @param callBack
     */
    public static void doGetAsyn(final String urlStr, final CallBack callBack)
    {
        new Thread()
        {
            public void run()
            {
                try
                {
                    String result = doGet(urlStr);
                    if (callBack != null)
                    {
                        callBack.onRequestComplete(result);
                    }
                } catch (Exception e)
                {
                    e.printStackTrace();
                }

            };
        }.start();
    }

    /**
     * 異步的Post請求
     * @param urlStr
     * @param params
     * @param callBack
     * @throws Exception
     */
    public static void doPostAsyn(final String urlStr, final String params,
            final CallBack callBack) throws Exception
    {
        new Thread()
        {
            public void run()
            {
                try
                {
                    String result = doPost(urlStr, params);
                    if (callBack != null)
                    {
                        callBack.onRequestComplete(result);
                    }
                } catch (Exception e)
                {
                    e.printStackTrace();
                }

            };
        }.start();

    }

    /**
     * Get請求，得到返回數據
     *
     * @param urlStr
     * @return
     * @throws Exception
     */
    public static String doGet(String urlStr)
    {
        URL url = null;
        HttpURLConnection conn = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        try
        {
            url = new URL(urlStr);
            conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
            conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
            conn.setRequestMethod("GET");
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            if (conn.getResponseCode() == 200)
            {
                is = conn.getInputStream();
                baos = new ByteArrayOutputStream();
                int len = -1;
                byte[] buf = new byte[128];

                while ((len = is.read(buf)) != -1)
                {
                    baos.write(buf, 0, len);
                }
                baos.flush();
                return baos.toString();
            } else
            {
                throw new RuntimeException(" responseCode is not 200 ... ");
            }

        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
            try
            {
                if (is != null)
                    is.close();
            } catch (IOException e)
            {
            }
            try
            {
                if (baos != null)
                    baos.close();
            } catch (IOException e)
            {
            }
            conn.disconnect();
        }

        return null ;

    }

    /**
     * 向指定 URL 發送POST方法的請求
     *
     * @param url
     *            發送請求的 URL
     * @param param
     *            請求參數，請求參數應該是 name1=value1&name2=value2 的形式。
     * @return 所表明遠程資源的響應結果
     * @throws Exception
     */
    public static String doPost(String url, String param)
    {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try
        {
            URL realUrl = new URL(url);
            // 打開和URL之間的鏈接
            HttpURLConnection conn = (HttpURLConnection) realUrl
                    .openConnection();
            // 設置通用的請求屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");
            conn.setRequestProperty("charset", "utf-8");
            conn.setUseCaches(false);
            // 發送POST請求必須設置以下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
            conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);

            if (param != null && !param.trim().equals(""))
            {
                // 獲取URLConnection對象對應的輸出流
                out = new PrintWriter(conn.getOutputStream());
                // 發送請求參數
                out.print(param);
                // flush輸出流的緩衝
                out.flush();
            }
            // 定義BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null)
            {
                result += line;
            }
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        // 使用finally塊來關閉輸出流、輸入流
        finally
        {
            try
            {
                if (out != null)
                {
                    out.close();
                }
                if (in != null)
                {
                    in.close();
                }
            } catch (IOException ex)
            {
                ex.printStackTrace();
            }
        }
        return result;
    }
}