Android常用工具类 日志、SP、App、屏幕、网络

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Android常用工具类

日志工具类L.java

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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);
	}
}

Toast统一管理类

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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();
	}

}

SharedPreferences封装类SPUtils

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package com.xhkjedu.xh_control_appstore.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 上下文
     * @param key     key
     * @param object  默认值
     */
    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       上下文
     * @param key           key
     * @param defaultObject 默认值
     * @return 返回值
     */
    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;
    }

    /**
     * 获取字符串类型
     *
     * @param context       上下文
     * @param key           key           key
     * @param defaultObject 默认值 默认值
     * @return 返回值 字符串
     */
    public static String getString(Context context, String key, String defaultObject) {
        Object o = get(context, key, defaultObject);
        if (o != null) {
            return o.toString();
        }
        return "";
    }

    /**
     * 移除某个key值已经对应的值
     *
     * @param context 上下文
     * @param key     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 上下文
     */
    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 上下文
     * @param key     key
     * @return 返回值
     */
    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 上下文
     * @return 返回值
     */
    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 返回值
         */
        @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 (Exception 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~~

单位转换类 DensityUtils

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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);
	}

}

SD卡相关辅助类 SDCardUtils

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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();
	}
}

​

屏幕相关辅助类 ScreenUtils

​

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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;

	}

}

App相关辅助类

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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;
	}

}

软键盘相关辅助类KeyBoardUtils

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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);
	}
}

网络相关辅助类 NetUtils

​

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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);
	}

}

Http相关辅助类 HttpUtils

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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;
	}
}

​

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