android快速开发--常用utils类

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。

1、日志工具类L.java

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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

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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

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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({ &quot;unchecked&quot;, &quot;rawtypes&quot; })  
private static Method findApplyMethod()  
{  
    try  
    {  
        Class clz = SharedPreferences.Editor.class;  
        return clz.getMethod(&quot;apply&quot;);  
    } 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

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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

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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

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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

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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

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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

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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 &amp;&amp; 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

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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(&quot; responseCode is not 200 ... &quot;);  
}  
```
  } 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 &amp;&amp; !param.trim().equals(&quot;&quot;))  
{  
    // 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 &#43;= 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~

android快速开发--常用utils类

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