Android快速開發(fā)系列 10個(gè)常用工具類實(shí)例代碼詳解

更新時(shí)間：2018年09月29日 15:32:48 作者：鴻洋_

今天特此整理出10個(gè)基本每個(gè)項(xiàng)目中都會(huì)使用的工具類，用于快速開發(fā),對(duì)android開發(fā)常用工具類感興趣的朋友跟隨小編一起看看吧

打開大家手上的項(xiàng)目，基本都會(huì)有一大批的輔助類，今天特此整理出10個(gè)基本每個(gè)項(xiàng)目中都會(huì)使用的工具類，用于快速開發(fā)~~在此感謝群里給我發(fā)項(xiàng)目中工具類的兄弟/姐妹~

1、日志工具類L.java

package com.zhy.utils;

import android.util.Log;
/**
 * Log統(tǒng)一管理類
 * 
 * 
 * 
 */
public class L
{
 private L()
 {
 /* cannot be instantiated */
 throw new UnsupportedOperationException("cannot be instantiated");
 }
 public static boolean isDebug = true;// 是否需要打印bug，可以在application的onCreate函數(shù)里面初始化
 private static final String TAG = "way";
 // 下面四個(gè)是默認(rèn)tag的函數(shù)
 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(shù)
 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(wǎng)上看到的類，注釋上應(yīng)該原創(chuàng)作者的名字，很簡(jiǎn)單的一個(gè)類；網(wǎng)上也有很多提供把日志記錄到SDCard上的，不過我是從來沒記錄過，所以引入個(gè)最簡(jiǎn)單的，大家可以進(jìn)行評(píng)價(jià)是否需要擴(kuò)充~~

2、Toast統(tǒng)一管理類

package com.zhy.utils;

import android.content.Context;
import android.widget.Toast;
/**
 * Toast統(tǒng)一管理類
 * 
 */
public class T
{
 private T()
 {
 /* cannot be instantiated */
 throw new UnsupportedOperationException("cannot be instantiated");
 }
 public static boolean isShow = true;
 /**
 * 短時(shí)間顯示Toast
 * 
 * @param context
 * @param message
 */
 public static void showShort(Context context, CharSequence message)
 {
 if (isShow)
 Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
 }
 /**
 * 短時(shí)間顯示Toast
 * 
 * @param context
 * @param message
 */
 public static void showShort(Context context, int message)
 {
 if (isShow)
 Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
 }
 /**
 * 長(zhǎng)時(shí)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(zhǎng)時(shí)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(shí)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(shí)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();
 }
}

也是非常簡(jiǎn)單的一個(gè)封裝，能省則省了~~

3、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(jī)里面的文件名
 */
 public static final String FILE_NAME = "share_data";
 /**
 * 保存數(shù)據(jù)的方法，我們需要拿到保存數(shù)據(jù)的具體類型，然后根據(jù)類型調(diào)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);
 }
 /**
 * 得到保存數(shù)據(jù)的方法，我們根據(jù)默認(rèn)值得到保存的數(shù)據(jù)的具體類型，然后調(diào)用相對(duì)于的方法獲取值
 * 
 * @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(gè)key值已經(jīng)對(duì)應(yīng)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);
 }
 /**
 * 清除所有數(shù)據(jù)
 * @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(gè)key是否已經(jīng)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);
 }
 /**
 * 返回所有的鍵值對(duì)
 * 
 * @param context
 * @return
 */
 public static Map<String, ?> getAll(Context context)
 {
 SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
 Context.MODE_PRIVATE);
 return sp.getAll();
 }
 /**
 * 創(chuàng)建一個(gè)解決SharedPreferencesCompat.apply方法的一個(gè)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;
 }
 /**
 * 如果找到則使用apply執(zhí)行，否則使用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(duì)SharedPreference的使用做了建議的封裝，對(duì)外公布出put，get，remove，clear等等方法；注意一點(diǎn)，里面所有的commit操作使用了SharedPreferencesCompat.apply進(jìn)行了替代，目的是盡可能的使用apply代替commit首先說下為什么，因?yàn)閏ommit方法是同步的，并且我們很多時(shí)候的commit操作都是UI線程中，畢竟是IO操作，盡可能異步；所以我們使用apply進(jìn)行替代，apply異步的進(jìn)行寫入；但是apply相當(dāng)于commit來說是new API呢，為了更好的兼容，我們做了適配；SharedPreferencesCompat也可以給大家創(chuàng)建兼容類提供了一定的參考~~

4、單位轉(zhuǎn)換類 DensityUtils

package com.zhy.utils;

import android.content.Context;
import android.util.TypedValue;
/**
 * 常用單位轉(zhuǎn)換的輔助類
 * 
 * 
 * 
 */
public class DensityUtils
{
 private DensityUtils()
 {
 /* cannot be instantiated */
 throw new UnsupportedOperationException("cannot be instantiated");
 }
 /**
 * dp轉(zhuǎn)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(zhuǎn)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(zhuǎn)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(zhuǎn)sp
 * 
 * @param fontScale
 * @param pxVal
 * @return
 */
 public static float px2sp(Context context, float pxVal)
 {
 return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
 }
}

5、SD卡相關(guān)輔助類 SDCardUtils

package com.zhy.utils;

import java.io.File;
import android.os.Environment;
import android.os.StatFs;
/**
 * SD卡相關(guān)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卡的剩余容量 單位byte
 * 
 * @return
 */
 public static long getSDCardAllSize()
 {
 if (isSDCardEnable())
 {
 StatFs stat = new StatFs(getSDCardPath());
 // 獲取空閑的數(shù)據(jù)塊的數(shù)量
 long availableBlocks = (long) stat.getAvailableBlocks() - 4;
 // 獲取單個(gè)數(shù)據(jù)塊的大?。╞yte）
 long freeBlocks = stat.getAvailableBlocks();
 return freeBlocks * availableBlocks;
 }
 return 0;
 }
 /**
 * 獲取指定路徑所在空間的剩余可用容量字節(jié)數(shù)，單位byte
 * 
 * @param filePath
 * @return 容量字節(jié) SDCard可用空間，內(nèi)部存儲(chǔ)可用空間
 */
 public static long getFreeBytes(String filePath)
 {
 // 如果是sd卡的下的路徑，則獲取sd卡可用容量
 if (filePath.startsWith(getSDCardPath()))
 {
 filePath = getSDCardPath();
 } else
 {// 如果是內(nèi)部存儲(chǔ)的路徑，則獲取內(nèi)存存儲(chǔ)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(tǒng)存儲(chǔ)路徑
 * 
 * @return
 */
 public static String getRootDirectoryPath()
 {
 return Environment.getRootDirectory().getAbsolutePath();
 }
}

6、屏幕相關(guān)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;
/**
 * 獲得屏幕相關(guān)的輔助類
 * 
 * 
 * 
 */
public class ScreenUtils
{
 private ScreenUtils()
 {
 /* cannot be instantiated */
 throw new UnsupportedOperationException("cannot be instantiated");
 }
 /**
 * 獲得屏幕高度
 * 
 * @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;
 }
 /**
 * 獲得屏幕寬度
 * 
 * @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;
 }
 /**
 * 獲得狀態(tài)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(dāng)前屏幕截圖，包含狀態(tài)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(dāng)前屏幕截圖，不包含狀態(tài)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;
 }
}

7、App相關(guān)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(guān)的輔助類
 * 
 * 
 * 
 */
public class AppUtils
{
 private AppUtils()
 {
 /* cannot be instantiated */
 throw new UnsupportedOperationException("cannot be instantiated");
 }
 /**
 * 獲取應(yīng)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(yīng)用程序版本名稱信息]
 * 
 * @param context
 * @return 當(dāng)前應(yīng)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;
 }
}

8、軟鍵盤相關(guān)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(guān)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(guān)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);
 }
}

9、網(wǎng)絡(luò)相關(guān)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(wǎng)絡(luò)相關(guān)的工具類
 * 
 * 
 * 
 */
public class NetUtils
{
 private NetUtils()
 {
 /* cannot be instantiated */
 throw new UnsupportedOperationException("cannot be instantiated");
 }
 /**
 * 判斷網(wǎng)絡(luò)是否連接
 * 
 * @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;
 }
 /**
 * 判斷是否是wifi連接
 */
 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(wǎng)絡(luò)設(shè)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相關(guān)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(qǐng)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(qǐng)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(qǐng)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(qǐng)求，獲得返回?cái)?shù)據(jù)
 * 
 * @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(fā)送POST方法的請(qǐng)求
 * 
 * @param url
 *   發(fā)送請(qǐng)求的 URL
 * @param param
 *   請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
 * @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)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之間的連接
 HttpURLConnection conn = (HttpURLConnection) realUrl
  .openConnection();
 // 設(shè)置通用的請(qǐng)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(fā)送POST請(qǐng)求必須設(shè)置如下兩行
 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(duì)象對(duì)應(yīng)的輸出流
 out = new PrintWriter(conn.getOutputStream());
 // 發(fā)送請(qǐng)求參數(shù)
 out.print(param);
 // flush輸出流的緩沖
 out.flush();
 }
 // 定義BufferedReader輸入流來讀取URL的響應(yīng)
 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(guān)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;
 }
}

總結(jié)

以上所述是小編給大家介紹的Android快速開發(fā)系列 10個(gè)常用工具類實(shí)例代碼詳解，希望對(duì)大家有所幫助，如果大家有任何疑問請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！

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