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Android开发 10个常用工具类详解

sanshao 2018年06月22日 手机开发 419 0
原文出处: 张鸿洋的博客  

打开大家手上的项目,基本都会有一大批的辅助类,今天特此整理出10个基本每个项目中都会使用的工具类,用于快速开发~~

在此感谢群里给我发项目中工具类的兄弟/姐妹~

1、日志工具类L.java

package com.zhy.utils;   
 
import android.util.Log;   
 
/**  
 * Log统一管理类  
 *   
 *   
 *   
 */   
public class L   
{   
 
    private L()   
    {   
        /* cannot be instantiated */   
        throw new UnsupportedOperationException("cannot be instantiated");   
    }   
 
    public static boolean isDebug = true;// 是否需要打印bug,可以在application的onCreate函数里面初始化   
    private static final String TAG = "way";   
  // 下面四个是默认tag的函数   
    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);   
    }   
 // 下面是传入自定义tag的函数   
    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);   
    }   
}

网上看到的类,注释上应该原创作者的名字,很简单的一个类;网上也有很多提供把日志记录到SDCard上的,不过我是从来没记录过,所以引入个最简单的,大家可以进行评价是否需要扩充~~

2、Toast统一管理类

package com.zhy.utils;   
 
import android.content.Context;   
import android.widget.Toast;   
 
/**  
 * Toast统一管理类  
 *   
 */   
public class T   
{   
 
    private T()   
    {   
        /** cannot be instantiated**/   
        throw new UnsupportedOperationException("cannot be instantiated");   
    }   
 
    public static boolean isShow = true;   
 /**  
     * 短时间显示Toast  
     *   
     * @param context  
     * @param message  
     */   
    public static void showShort(Context context, CharSequence message)   
    {   
        if (isShow)   
            Toast.makeText(context, message, Toast.LENGTH_SHORT).show();   
    }   
 
    /**  
     * 短时间显示Toast  
     *   
     * @param context  
     * @param message  
     */   
    public static void showShort(Context context, int message)   
    {   
        if (isShow)   
            Toast.makeText(context, message, Toast.LENGTH_SHORT).show();   
    }   
    /**  
     * 长时间显示Toast  
     *   
     * @param context  
     * @param message  
     */   
    public static void showLong(Context context, CharSequence message)   
    {   
        if (isShow)   
            Toast.makeText(context, message, Toast.LENGTH_LONG).show();   
    }   
 
    /**  
     * 长时间显示Toast  
     *   
     * @param context  
     * @param message  
     */   
    public static void showLong(Context context, int message)   
    {   
        if (isShow)   
            Toast.makeText(context, message, Toast.LENGTH_LONG).show();   
    }   
    /**  
     * 自定义显示Toast时间  
     *   
     * @param context  
     * @param message  
     * @param duration  
     */   
    public static void show(Context context, CharSequence message, int duration)   
    {   
        if (isShow)   
            Toast.makeText(context, message, duration).show();   
    }   
 
    /**  
     * 自定义显示Toast时间  
     *   
     * @param context  
     * @param message  
     * @param duration  
     */   
    public static void show(Context context, int message, int duration)   
    {   
        if (isShow)   
            Toast.makeText(context, message, duration).show();   
    }   
 
}

也是非常简单的一个封装,能省则省了~~

3、SharedPreferences封装类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   
{   
    /**  
     * 保存在手机里面的文件名  
     */   
    public static final String FILE_NAME = "share_data";   
 
    /**  
     * 保存数据的方法,我们需要拿到保存数据的具体类型,然后根据类型调用不同的保存方法  
     *   
     * @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);   
    }   
    /**  
     * 得到保存数据的方法,我们根据默认值得到保存的数据的具体类型,然后调用相对于的方法获取值  
     *   
     * @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;   
    }   
    /**  
     * 移除某个key值已经对应的值  
     * @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);   
    }   
 
    /**  
     * 清除所有数据  
     * @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);   
    }   
 
    /**  
     * 查询某个key是否已经存在  
     * @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);   
    }   
    /**  
     * 返回所有的键值对  
     *   
     * @param context  
     * @return  
     */   
    public static Map<String, ?> getAll(Context context)   
    {   
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME,   
                Context.MODE_PRIVATE);   
        return sp.getAll();   
    }   
 
    /**  
     * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类  
     *   
     * @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;   
        }   
        /**  
         * 如果找到则使用apply执行,否则使用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();   
        }   
    }   
 
}

对SharedPreference的使用做了建议的封装,对外公布出put,get,remove,clear等等方法;

注意一点,里面所有的commit操作使用了SharedPreferencesCompat.apply进行了替代,目的是尽可能的使用apply代替commit

首先说下为什么,因为commit方法是同步的,并且我们很多时候的commit操作都是UI线程中,毕竟是IO操作,尽可能异步;

所以我们使用apply进行替代,apply异步的进行写入;

但是apply相当于commit来说是new API呢,为了更好的兼容,我们做了适配;

SharedPreferencesCompat也可以给大家创建兼容类提供了一定的参考~~

4、单位转换类 DensityUtils

    package com.zhy.utils;   
 
    import android.content.Context;   
    import android.util.TypedValue;   
 
    /**  
     * 常用单位转换的辅助类  
     *   
     *   
     *   
     */   
    public class DensityUtils   
    {   
        private DensityUtils()   
        {   
            /** cannot be instantiated **/   
            throw new UnsupportedOperationException("cannot be instantiated");   
        }   
 
        /**  
         * dp转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转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转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转sp  
                 *   
                 * @param fontScale  
                 * @param pxVal  
                 * @return  
                 */   
                public static float px2sp(Context context, float pxVal)   
                {   
                    return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);   
                }   
 
            }

5、SD卡相关辅助类 SDCardUtils

package com.zhy.utils;   
 
import java.io.File;   
 
import android.os.Environment;   
import android.os.StatFs;   
 
/**  
 * SD卡相关的辅助类  
 *   
 *   
 *   
 */   
public class SDCardUtils   
{   
    private SDCardUtils()   
    {   
        /** cannot be instantiated **/   
        throw new UnsupportedOperationException("cannot be instantiated");   
    }   
 
    /**  
     * 判断SDCard是否可用  
     *   
     * @return  
     */   
    public static boolean isSDCardEnable()   
    {   
        return Environment.getExternalStorageState().equals(   
                Environment.MEDIA_MOUNTED);   
 
    }   
 
    /**  
     * 获取SD卡路径  
     *   
     * @return  
     */   
    public static String getSDCardPath()   
    {   
        return Environment.getExternalStorageDirectory().getAbsolutePath()   
                + File.separator;   
    }   
 
    /**  
     * 获取SD卡的剩余容量 单位byte  
     *   
     * @return  
     */   
    public static long getSDCardAllSize()   
    {   
        if (isSDCardEnable())   
        {   
            StatFs stat = new StatFs(getSDCardPath());   
            // 获取空闲的数据块的数量   
            long availableBlocks = (long) stat.getAvailableBlocks() - 4;   
            // 获取单个数据块的大小(byte)   
            long freeBlocks = stat.getAvailableBlocks();   
            return freeBlocks * availableBlocks;   
        }   
        return 0;   
    }   
 
    /**  
     * 获取指定路径所在空间的剩余可用容量字节数,单位byte  
     *   
     * @param filePath  
     * @return 容量字节 SDCard可用空间,内部存储可用空间  
     */   
    public static long getFreeBytes(String filePath)   
    {   
        // 如果是sd卡的下的路径,则获取sd卡可用容量   
        if (filePath.startsWith(getSDCardPath()))   
        {   
            filePath = getSDCardPath();   
        } else   
        {// 如果是内部存储的路径,则获取内存存储的可用容量   
            filePath = Environment.getDataDirectory().getAbsolutePath();   
        }   
        StatFs stat = new StatFs(filePath);   
        long availableBlocks = (long) stat.getAvailableBlocks() - 4;   
        return stat.getBlockSize() * availableBlocks;   
    }   
 
    /**  
     * 获取系统存储路径  
     *   
     * @return  
     */   
    public static String getRootDirectoryPath()   
    {   
        return Environment.getRootDirectory().getAbsolutePath();   
    }   
 
}

6、屏幕相关辅助类 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;   
 
    /**  
     * 获得屏幕相关的辅助类  
     *   
     *   
     *   
     */   
    public class ScreenUtils   
    {   
        private ScreenUtils()   
        {   
            /** cannot be instantiated **/   
            throw new UnsupportedOperationException("cannot be instantiated");   
        }   
 
        /**  
         * 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;   
        }   
 
        /**  
         * 获取当前屏幕截图,包含状态栏  
         *   
         * @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;   
 
        }   
 
        /**  
         * 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;   
 
        }   
 
    }

7、App相关辅助类

    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相关的辅助类  
     *   
     *   
     *   
     */   
    public class AppUtils   
    {   
 
        private AppUtils()   
        {   
            /**cannot be instantiated **/   
            throw new UnsupportedOperationException("cannot be instantiated");   
 
        }   
 
        /**  
         * 获取应用程序名称  
         */   
        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;   
        }   
 
        /**  
         * [获取应用程序版本名称信息]  
         *   
         * @param context  
         * @return 当前应用的版本名称  
         */   
        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;   
        }   
 
    }

8、软键盘相关辅助类KeyBoardUtils

    package com.zhy.utils;   
 
    import android.content.Context;   
    import android.view.inputmethod.InputMethodManager;   
    import android.widget.EditText;   
 
    /**  
     * 打开或关闭软键盘  
     *   
     * @author zhy  
     *   
     */   
    public class KeyBoardUtils   
    {   
        /**  
         * 打卡软键盘  
         *   
         * @param mEditText  
         *            输入框  
         * @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);   
        }   
 
        /**  
         * 关闭软键盘  
         *   
         * @param mEditText  
         *            输入框  
         * @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);   
        }   
    }

9、网络相关辅助类 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;   
 
    /**  
     * 跟网络相关的工具类  
     *   
     *   
     *   
     */   
    public class NetUtils   
    {   
        private NetUtils()   
        {   
            /** cannot be instantiated **/   
            throw new UnsupportedOperationException("cannot be instantiated");   
        }   
 
        /**  
         * 判断网络是否连接  
         *   
         * @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;   
        }   
 
        /**  
         * 判断是否是wifi连接  
         */   
        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;   
 
        }   
 
        /**  
         * 打开网络设置界面  
         */   
        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);   
        }   
 
    }

10、Http相关辅助类 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请求的工具类  
     *   
     * @author zhy  
     *   
     */   
    public class HttpUtils   
    {   
 
        private static final int TIMEOUT_IN_MILLIONS = 5000;   
 
        public interface CallBack   
        {   
            void onRequestComplete(String result);   
        }   
 
        /**  
         * 异步的Get请求  
         *   
         * @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();   
        }   
 
        /**  
         * 异步的Post请求  
         * @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请求,获得返回数据  
         *   
         * @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 发送POST方法的请求   
         *    
         * @param url   
         *            发送请求的 URL   
         * @param param   
         *            请求参数,请求参数应该是 name1=value1&name2=value2 的形式。   
         * @return 所代表远程资源的响应结果   
         * @throws Exception   
         */   
        public static String doPost(String url, String param)    
        {   
            PrintWriter out = null;   
            BufferedReader in = null;   
            String result = "";   
            try   
            {   
                URL realUrl = new URL(url);   
                // 打开和URL之间的连接   
                HttpURLConnection conn = (HttpURLConnection) realUrl   
                        .openConnection();   
                // 设置通用的请求属性   
                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);   
                // 发送POST请求必须设置如下两行   
                conn.setDoOutput(true);   
                conn.setDoInput(true);   
                conn.setReadTimeout(TIMEOUT_IN_MILLIONS);   
                conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);   
 
                if (param != null && !param.trim().equals(""))   
                {   
                    // 获取URLConnection对象对应的输出流   
                    out = new PrintWriter(conn.getOutputStream());   
                    // 发送请求参数   
                    out.print(param);   
                    // flush输出流的缓冲   
                    out.flush();   
                }   
                // 定义BufferedReader输入流来读取URL的响应   
                in = new BufferedReader(   
                        new InputStreamReader(conn.getInputStream()));   
                String line;   
                while ((line = in.readLine()) != null)   
                {   
                    result += line;   
                }   
            } catch (Exception e)   
            {   
                e.printStackTrace();   
            }   
            // 使用finally块来关闭输出流、输入流   
            finally   
            {   
                try   
                {   
                    if (out != null)   
                    {   
                        out.close();   
                    }   
                    if (in != null)   
                    {   
                        in.close();   
                    }   
                } catch (IOException ex)   
                {   
                    ex.printStackTrace();   
                }   
            }   
            return result;   
        }   
    }

如果大家在使用过程中出现什么错误,或者有更好的建议,欢迎大家留言提出~~可以不断的改进这些类~

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36个Android开发常用代码片段详解
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