实用工具类合集-优快云博客

1、日志工具类

public class Logutils {
    private Logutils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }
    // 是否需要打印bug，可以在application的onCreate函数里面初始化
    public static boolean isDebug = true;
    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);
    }
}

2、Toast工具类

public class ToastUtils {
    /**
     * 显示土司的工具类,安全的工具类可以在任意线程里面显示
     * @param activity
     * @param text
     * */
    public static void show(final Activity activity,final String text){
        //需要判断当前的线程是否是主线程
        if("main".equalsIgnoreCase(Thread.currentThread().getName())){
            Toast.makeText(activity, text, 0).show();
        }else{//说明不是主线程
            activity.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(activity, text, 0).show();
                }
            });
        }
    }
    /**
     * 显示土司的方法,安全的工具类可以在任意线程里面显示,并指定时长
     * @param activity
     * @param text
     * @param length 显示的时长
     * */
    public static void show(final Activity activity,final String text,final int length){
        //需要判断当前的线程是否是主线程
        if("main".equalsIgnoreCase(Thread.currentThread().getName())){
            Toast.makeText(activity, text, length).show();
        }else{//说明不是主线程
            activity.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(activity, text, length).show();
                }
            });
        }
    }
}

3、SharePreferences工具类

public class SharePreferencesUtils {
    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*/
    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*/
    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*/
    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*/
    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*/
    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*/
    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*/
    private static class SharedPreferencesCompat {
        private static final Method sApplyMethod = findApplyMethod();
        /**反射查找apply的方法*/
        @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*/
        public static void apply(SharedPreferences.Editor editor) {
            try {
                if (sApplyMethod != null) {
                    sApplyMethod.invoke(editor);
                    return;
                }
            } catch (Exception e) {
            }
            editor.commit();
        }
    }
}

4、单位转换类

public class DensityUtils {
    private DensityUtils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }
    /**dp转px*/
    public static int dp2px(Context context, float dpVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dpVal, context.getResources().getDisplayMetrics());
    }
    /**sp转px*/
    public static int sp2px(Context context, float spVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
                spVal, context.getResources().getDisplayMetrics());
    }
    /**px转dp*/
    public static float px2dp(Context context, float pxVal) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (pxVal / scale);
    }
    /**px转sp*/
    public static float px2sp(Context context, float pxVal) {
        return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
    }
}

5、SD卡工具类

public class SDCardUtils {
    private SDCardUtils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }
    /**判断SDCard是否可用*/
    public static boolean isSDCardEnable() {
        return Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED);
    }
    /**获取SD卡路径*/
    public static String getSDCardPath() {
        return Environment.getExternalStorageDirectory().getAbsolutePath()
                + File.separator;
    }
    /**获取SD卡的剩余容量 单位byte*/
    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
     * @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*/
    public static String getRootDirectoryPath() {
        return Environment.getRootDirectory().getAbsolutePath();
    }
}

6、屏幕相关工具类

public class ScreenUtils {
    private ScreenUtils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }
    /**获得屏幕高度*/
    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*/
    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*/
    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*/
    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*/
    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

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]
     * @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、软键盘辅助类

public class KeyBoardUtils {
    /**
     * 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

public class NetUtils {
    private NetUtils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }
    /**判断网络是否连接*/
    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

public class HttpUtils {
    private static final int TIMEOUT_IN_MILLIONS = 5000;
    public interface CallBack {
        void onRequestComplete(String result);
    }
    /**异步的Get请求*/
    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*/
    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*/
    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;
    }
}

11、MD5加密工具类

public class MD5Utils {
    /**
     * 加密字符串采用md5算法
     * */
    public static String encode(String text) {
        try {
            MessageDigest digest = MessageDigest.getInstance("md5");
            byte[] result = digest.digest(text.getBytes());
            StringBuffer sb = new StringBuffer();
            for (byte b : result) {
                String hex = Integer.toHexString(b & 0xff);
                if (hex.length() == 1) {
                    sb.append("0");
                } else {
                    sb.append(hex);
                }
            }
            return sb.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return "";// 不可达到
    }
}

12、服务状态工具类

/**
 * 服务运行状态的工具类
 * */
public class ServiceStatesUtils {
    /**
     * 判断服务是否处于运行状态
     * @param context 上下文
     * @param className 服务的全路径类名
     * @return true  服务运行中false服务已经停止
     * */
    public static boolean isServiceRunning(Context context,String classname){
        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningServiceInfo> runningServices = manager.getRunningServices(100);//后台最大有100服务在运行
        for(RunningServiceInfo info:runningServices){
            String className = info.service.getClassName();
            if(classname.equals(className)){
                return true;
            }
        }
        return false;
    }
}

13、流转换字符串

public class StreamUtils {
    /**
     * 把一个流的内容读取出来转换成字符串
     * @param is
     * @return 解析成功返回字符串,解析失败返回null
     * */
    public static String readString(InputStream is) {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] buf = new byte[1024];
            int len = 0;
            while ((len = is.read(buf)) != -1) {
                baos.write(buf, 0, len);
            }
            is.close();
            return baos.toString();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}

14、系统信息工具类

public class SystemInfoUtils {
    /**
     * 获取手机里面正在运行的进程数量
     * @param context 上下文，要获取手机的状态信息，必须得到ActivityManager
     * @return
     */
    public static int getRunningProcessCount(Context context){
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        //获取正在运行的应用程序进程的集合
        List<RunningAppProcessInfo> infos = am.getRunningAppProcesses();
        return infos.size();
    }
    /**
     * 获取手机的剩余可用内存(ram)空间
     * @param context
     * @return 可用内存的大小 单位byte
     */
    public static long getAvailRam(Context context){
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        MemoryInfo outInfo = new MemoryInfo();
        am.getMemoryInfo(outInfo);
        return outInfo.availMem;    
    }
    /**
     * 获取手机的总内存(ram)空间
     * @param context
     * @return 总的内存的大小 单位byte
     */
    public static long gettotalRam(Context context){
        
      /*api 16版本才出现的api,为了迎合低版本，我们直接去读取linux的配置文件
         ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
         MemoryInfo outInfo = new MemoryInfo();
         am.getMemoryInfo(outInfo);
         return outInfo.totalMem;*/
        
          //低版本适配可以使用如下方法
          try {
            File file = new File("/proc/meminfo");
            FileInputStream fis = new FileInputStream(file);
            BufferedReader bufr = new BufferedReader(new InputStreamReader(fis));
            String line = bufr.readLine();
            StringBuffer sb = new StringBuffer();
            //MemTotal:N多空格加  513000 kB，所以将其转化为字符 判断取出其中的数字
            for(char c : line.toCharArray()){
                if(c>'0' && c < '9'){
                    sb.append(c);
                }
            }
            //System.out.println(Long.parseLong(sb.toString()));
            //过滤出来的数字*1024 转成byte数进行返回
            return Long.parseLong(sb.toString())*1024;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }
}