android各种常用的方法集合
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1、常用的方法Utils
public class Utils { // 记录屏幕的高度、宽度、密度等信息。 public static int screenH; public static int screenW; public static float screenDensity; // 屏幕密度（0.75 / 1.0 / 1.5） public static int screenDensityDpi; // 屏幕密度DPI（120 / 160 / 240） public static int statusBarHeight; // 状态栏高度 // 获取屏幕的高度和宽度 public static int getScreenW(Activity mActivity) { if (screenW == 0) { DisplayMetrics metric = new DisplayMetrics(); mActivity.getWindowManager().getDefaultDisplay().getMetrics(metric); screenW = metric.widthPixels; // 屏幕宽度（像素） screenH = metric.heightPixels; // 屏幕高度（像素） screenDensity = metric.density; // 屏幕密度（0.75 / 1.0 / 1.5） screenDensityDpi = metric.densityDpi; // 屏幕密度DPI（120 / 160 / } return screenW; } public static int getScreenH(Activity mActivity) { if (screenH == 0) { DisplayMetrics metric = new DisplayMetrics(); mActivity.getWindowManager().getDefaultDisplay().getMetrics(metric); screenW = metric.widthPixels; // 屏幕宽度（像素） screenH = metric.heightPixels; // 屏幕高度（像素） screenDensity = metric.density; // 屏幕密度（0.75 / 1.0 / 1.5） screenDensityDpi = metric.densityDpi; // 屏幕密度DPI（120 / 160 / } return screenH; } /** * 升级检测 * * @param locVersionName * @param lastVersion * @return 是否升级 */ public static boolean checkUpdate(String locVersionName, String lastVersion) { boolean hasUpdate = false; String[] locVersionS = locVersionName.split("\\."); String[] lastVersionS = lastVersion.split("\\."); if (!locVersionName.equals(lastVersion)) { if (locVersionS != null && lastVersion != null) { int localLenth = locVersionS.length; int lastVerLenth = lastVersionS.length; // int netLenth = lastVersion.length(); for (int i = 0; i < lastVerLenth; i++) { if (localLenth < lastVerLenth && i == localLenth) { hasUpdate = true; return hasUpdate; } if (Integer.valueOf(lastVersionS[i]) > Integer .valueOf(locVersionS[i])) { hasUpdate = true; return hasUpdate; } else if (Integer.valueOf(lastVersionS[i]) < Integer .valueOf(locVersionS[i])) { hasUpdate = false; return hasUpdate; } } } } else { hasUpdate = false; } return hasUpdate; } /** * bitmap转byte数组 * * @param bmp * @param needRecycle * @return */ public static byte[] bmpToByteArray(final Bitmap bmp, final boolean needRecycle) { ByteArrayOutputStream output = new ByteArrayOutputStream(); bmp.compress(CompressFormat.PNG, 100, output); if (needRecycle) { bmp.recycle(); } byte[] result = output.toByteArray(); try { output.close(); } catch (Exception e) { e.printStackTrace(); } return result; } /** * 实现文本复制功能 add by lif * * @param content */ public static void copy(String content, Context context) { // 得到剪贴板管理器 ClipboardManager cmb = (ClipboardManager) context .getSystemService(Context.CLIPBOARD_SERVICE); cmb.setText(content.trim()); } /** * 实现粘贴功能 add by lif * * @param context * @return */ public static String paste(Context context) { // 得到剪贴板管理器 ClipboardManager cmb = (ClipboardManager) context .getSystemService(Context.CLIPBOARD_SERVICE); return cmb.getText().toString().trim(); } /** * 隐藏软键盘 */ public static void hideSoftInputMethod(Activity act) { View view = act.getWindow().peekDecorView(); if (view != null) { // 隐藏虚拟键盘 InputMethodManager inputmanger = (InputMethodManager) act .getSystemService(act.INPUT_METHOD_SERVICE); inputmanger.hideSoftInputFromWindow(view.getWindowToken(), 0); } } /** * 切换软件盘 显示隐藏 */ public static void switchSoftInputMethod(Activity act) { // 方法一(如果输入法在窗口上已经显示，则隐藏，反之则显示) InputMethodManager imm = (InputMethodManager) act .getSystemService(Context.INPUT_METHOD_SERVICE); imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS); } /** * 验证是否手机号码 * * @param mobiles * @return */ public static boolean isMobileNO(String mobiles) { Pattern p = Pattern .compile("^((13[0-9])|(15[^4,//D])|(18[0,5-9]))//d{8}$"); Matcher m = p.matcher(mobiles); System.out.println(m.matches() + "---"); return m.matches(); } /** * 中文识别 * */ public static boolean hasChinese(String source) { String reg_charset = "([\\u4E00-\\u9FA5]*+)"; Pattern p = Pattern.compile(reg_charset); Matcher m = p.matcher(source); boolean hasChinese = false; while (m.find()) { if (!"".equals(m.group(1))) { hasChinese = true; } } return hasChinese; } /** * 用户名规则判断 * * @param uname * @return */ public static boolean isAccountStandard(String uname) { Pattern p = Pattern.compile("[A-Za-z0-9_]+"); Matcher m = p.matcher(uname); return m.matches(); } // java 合并两个byte数组 public static byte[] byteMerger(byte[] byte_1, byte[] byte_2) { byte[] byte_3 = new byte[byte_1.length + byte_2.length]; System.arraycopy(byte_1, 0, byte_3, 0, byte_1.length); System.arraycopy(byte_2, 0, byte_3, byte_1.length, byte_2.length); return byte_3; }}2、常用的Log方法LogCat
public class LogCat { private static final boolean DEBUG = true; private static final String TAG = "TAG"; public static void v(String msg){ if (DEBUG) { android.util.Log.v(TAG, msg); } } public static void v(String tag, String msg) { if (DEBUG) { android.util.Log.v(tag, msg); } } public static void v(String tag, String msg, Throwable tr) { if (DEBUG) { android.util.Log.v(tag, msg, tr); } } public static void d(String msg) { if (DEBUG) { android.util.Log.d(TAG, msg); } } public static void d(String tag, String msg) { if (DEBUG) { android.util.Log.d(tag, msg); } } public static void d(String tag, String msg, Throwable tr) { if (DEBUG) { android.util.Log.d(tag, msg, tr); } } public static void i(String msg) { if (DEBUG) { android.util.Log.i(TAG, msg); } } public static void i(String tag, String msg) { if (DEBUG) { android.util.Log.i(tag, msg); } } public static void i(String tag, String msg, Throwable tr) { if (DEBUG) { android.util.Log.i(tag, msg, tr); } } public static void w(String msg) { if (DEBUG) { android.util.Log.w(TAG, msg); } } public static void w(String tag, String msg) { if (DEBUG) { android.util.Log.w(tag, msg); } } public static void w(String tag, String msg, Throwable tr) { if (DEBUG) { android.util.Log.w(tag, msg, tr); } } public static void w(String tag, Throwable tr) { if (DEBUG) { android.util.Log.w(tag, tr); } } public static void e(String msg) { if (DEBUG) { android.util.Log.e(TAG, msg); } } public static void e(String tag, String msg) { if (DEBUG) { android.util.Log.e(tag, msg); } } public static void e(String tag, String msg, Throwable tr) { if (DEBUG) { android.util.Log.e(tag, msg, tr); } }}3、常用的网络方法NetworkUtils
public class NetworkUtils { public static boolean mNetWorkState; public static boolean NETWORN_NONE=false ; // public static boolean NETWORN_WIFI=false ; public static boolean NETWORN_MOBILE; public static boolean isWifiConnected(Context context) { boolean network_wifi=false; if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mWiFiNetworkInfo = mConnectivityManager .getNetworkInfo(ConnectivityManager.TYPE_WIFI); if (mWiFiNetworkInfo != null) { network_wifi= mWiFiNetworkInfo.isAvailable(); } } return network_wifi; } public boolean isMobileConnected(Context context) { NETWORN_MOBILE=false; if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mMobileNetworkInfo = mConnectivityManager .getNetworkInfo(ConnectivityManager.TYPE_MOBILE); if (mMobileNetworkInfo != null) { NETWORN_MOBILE= mMobileNetworkInfo.isAvailable(); } } return NETWORN_MOBILE; } public static int getConnectedType(Context context) { if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo(); if (mNetworkInfo != null && mNetworkInfo.isAvailable()) { return mNetworkInfo.getType(); } } return -1; } private boolean checkNetworkState(Context context) { mNetWorkState = false; //得到网络连接信息 ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); //去进行判断网络是否连接 if (mConnectivityManager.getActiveNetworkInfo() != null) { mNetWorkState = mConnectivityManager.getActiveNetworkInfo().isAvailable(); } return mNetWorkState; }}4、常用的文件方法CacheFileUtil
public class CacheFileUtil { /** 1秒超时时间 */ public static final int CONFIG_CACHE_SHORT_TIMEOUT=1000 * 60 * 5; // 5 分钟 /** 5分钟超时时间 */ public static final int CONFIG_CACHE_MEDIUM_TIMEOUT=1000 * 3600 * 2; // 2小时 /** 中长缓存时间 */ public static final int CONFIG_CACHE_ML_TIMEOUT=1000 * 60 * 60 * 24 * 1; // 1天 /** 最大缓存时间 */ public static final int CONFIG_CACHE_MAX_TIMEOUT=1000 * 60 * 60 * 24 * 7; // 7天 public static final String cacheName = "TVSmall2"; public static final int CONFIG_CACHE_WIFI_TIMEOUT = 300000; //5 minute wifi环境下的缓存时间设置为5分钟 public static final int CONFIG_CACHE_MOBILE_TIMEOUT = 3600000; //1 hour 移动数据流量下的缓存时间设置为1小时 public void setDataCacheFile(String result,String filename,String time){ try { if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ File sdCardDir = Environment.getExternalStorageDirectory(); //获取SDCard目录 File saveFile = new File(sdCardDir+File.separator+cacheName,time+filename); removeExpiredCache(sdCardDir+File.separator+cacheName,time+filename); //设置缓存文件时间为1天 if (!saveFile.getParentFile().exists()) { saveFile.getParentFile().mkdirs(); } FileOutputStream outStream = new FileOutputStream(saveFile); outStream.write(result.getBytes()); outStream.close(); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public String getCacheDate(String filename,String time){ String result = null; File file = new File(Environment.getExternalStorageDirectory()+File.separator+cacheName,time+filename); if (file.exists() && file.isFile()) { long expiredTime = System.currentTimeMillis() - file.lastModified(); if(NetworkUtils.mNetWorkState==false){ //无网络 result =readTextFile(file); }else{ if(NetworkUtils.NETWORN_WIFI==true&& expiredTime>CONFIG_CACHE_WIFI_TIMEOUT){ return null; }else if(NetworkUtils.NETWORN_NONE==true&& expiredTime>CONFIG_CACHE_MOBILE_TIMEOUT){ return null; } } result =readTextFile(file); } return result; } public String readTextFile(File file) { StringBuffer sb = new StringBuffer(); try { BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(file),"UTF-8")); FileInputStream fis = new FileInputStream(file); int c; while ((c = br.read()) != -1) { sb.append((char) c); } br.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return sb.toString(); } public void writeTextFile(File file, String data) { PrintStream out = null; try { out = new PrintStream(new FileOutputStream(file)); out.print(data.toString()); } catch (FileNotFoundException e) { e.printStackTrace(); } finally { if (out != null) { out.close(); } }/** * (/data/data/com.xxx.xxx/cache) * * @param context */ public static void cleanInternalCache(Context context) { deleteFilesByDirectory(context.getCacheDir()); } /** * (/data/data/com.xxx.xxx/databases) * * @param context */ public static void cleanDatabases(Context context) { deleteFilesByDirectory(new File("/data/data/" + context.getPackageName() + "/databases")); } /** * * SharedPreference(/data/data/com.xxx.xxx/shared_prefs) * * @param * context */ public static void cleanSharedPreference(Context context) { deleteFilesByDirectory(new File("/data/data/" + context.getPackageName() + "/shared_prefs")); } /** * @param context * * @param dbName */ public static void cleanDatabaseByName(Context context, String dbName) { context.deleteDatabase(dbName); } /** /data/data/com.xxx.xxx/files* * @param context */ public static void cleanFiles(Context context) { deleteFilesByDirectory(context.getFilesDir()); } /** * * (/mnt/sdcard/android/data/com.xxx.xxx/cache) * * @param context */ public static void cleanExternalCache(Context context) { if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { Log.e("smile", "cleanExternalCache " + context.getExternalCacheDir()); deleteFilesByDirectory(context.getExternalCacheDir()); } } /** @param filePath */ public static void cleanCustomCache(String filePath) { deleteFilesByDirectory(new File(filePath)); } /** * @param context * * @param filepath */ public static void cleanApplicationData(Context context) { cleanInternalCache(context); cleanExternalCache(context); cleanFiles(context); } /** @param directory */ private static void deleteFilesByDirectory(File directory) { if (directory.isFile()) { directory.delete(); return; } if (directory.isDirectory()) { File[] childFiles = directory.listFiles(); if (childFiles == null || childFiles.length == 0) { directory.delete(); return; } for (int i = 0; i < childFiles.length; i++) { deleteFilesByDirectory(childFiles[i]); } directory.delete(); } } public static String getTotalCacheSize(Context context) throws Exception { long cacheSize = getFolderSize(context.getCacheDir()); if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { cacheSize += getFolderSize(context.getExternalCacheDir()); } cacheSize += getFolderSize(context.getFilesDir()); return getFormatSize(cacheSize); } // 计算某个文件的大小 private static long getFolderSize(File file) throws Exception { long size = 0; try { File[] fileList = file.listFiles(); for (int i = 0; i < fileList.length; i++) { // 如果下面还有文件 if (fileList[i].isDirectory()) { size = size + getFolderSize(fileList[i]); } else { size = size + fileList[i].length(); } } } catch (Exception e) { e.printStackTrace(); } return size; } /** * 格式化单位 * * @param size * @return */ public static String getFormatSize(double size) { double kiloByte = size / 1024; if (kiloByte < 1) { return "0K"; } double megaByte = kiloByte / 1024; if (megaByte < 1) { BigDecimal result1 = new BigDecimal(Double.toString(kiloByte)); return result1.setScale(2, BigDecimal.ROUND_HALF_UP) .toPlainString() + "K"; } double gigaByte = megaByte / 1024; if (gigaByte < 1) { BigDecimal result2 = new BigDecimal(Double.toString(megaByte)); return result2.setScale(2, BigDecimal.ROUND_HALF_UP) .toPlainString() + "M"; } double teraBytes = gigaByte / 1024; if (teraBytes < 1) { BigDecimal result3 = new BigDecimal(Double.toString(gigaByte)); return result3.setScale(2, BigDecimal.ROUND_HALF_UP) .toPlainString() + "G"; } BigDecimal result4 = new BigDecimal(teraBytes); return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "T"; } } @SuppressWarnings("unused") private void removeExpiredCache(String dirPath, String filename) { File file = new File(dirPath,filename); if (System.currentTimeMillis() -file.lastModified() > CONFIG_CACHE_ML_TIMEOUT) { file.delete(); } }}5、常用的时间方法TimeUtil
public class TimeUtil { public static String getCurrentTime() { return getCurrentTime("yyyy-MM-dd HH:mm:ss"); } public static String getCurrentTime(String format) { Date date = new Date(); SimpleDateFormat sdf = new SimpleDateFormat(format, Locale.getDefault()); String currentTime = sdf.format(date); return currentTime; } public static String getTime(int count) { SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Calendar c = Calendar.getInstance(); c.add(Calendar.DAY_OF_MONTH, -count); Date d = c.getTime(); return format.format(d); } public static String getTime(int year, int monthOfYear, int dayOfMonth) { SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); Calendar c = Calendar.getInstance(); c.set(Calendar.YEAR, year); c.set(Calendar.MONTH, monthOfYear); c.set(Calendar.DAY_OF_MONTH, dayOfMonth); Date d = c.getTime(); return format.format(d); } public static int getYear(String time) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar calendar = GregorianCalendar.getInstance(); try { calendar.setTime(sdf.parse(time)); } catch (ParseException e) { e.printStackTrace(); } int year = calendar.get(Calendar.YEAR); return year; } public static int getMonth(String time) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar calendar = GregorianCalendar.getInstance(); try { calendar.setTime(sdf.parse(time)); } catch (ParseException e) { e.printStackTrace(); } int month = calendar.get(Calendar.MONTH); return month; } public static int getDay(String time) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar calendar = GregorianCalendar.getInstance(); try { calendar.setTime(sdf.parse(time)); } catch (ParseException e) { e.printStackTrace(); } int day = calendar.get(Calendar.DATE); return day; } /** * -1:date1大于date2； * 1:date1小于date2 * * @param date1 * @param date2 * @return */ public static int compareDate(String date1, String date2) { DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); try { Date dt1 = df.parse(date1); Date dt2 = df.parse(date2); if (dt1.getTime() > dt2.getTime()) { return -1; } else if (dt1.getTime() < dt2.getTime()) { return 1; } else { return 0; } } catch (Exception exception) { exception.printStackTrace(); } return 0; } /** * 将millis转换成yyyy-MM-dd * @param millis * @return */ public static String millisToDay(long millis){ SimpleDateFormat formater = new SimpleDateFormat("yyyy-MM-dd"); Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(millis); String day = formater.format(calendar.getTime()); return day; }6、常用的SharedPreferences方法SaveValueToShared
public class SaveValueToShared { public static void saveDataToSharedpreference(Context mContext, String spName, String key, Boolean value) { SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_WRITEABLE); SharedPreferences.Editor editor = sPreferences.edit(); editor.putBoolean(key, value); editor.commit(); } public static void saveDataToSharedpreference(Context mContext, String spName, String key, String value){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_WRITEABLE); SharedPreferences.Editor editor = sPreferences.edit(); editor.putString(key, value); editor.commit(); } public static void saveDataToSharedpreference(Context mContext, String spName, String key, int value){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_WRITEABLE); SharedPreferences.Editor editor = sPreferences.edit(); editor.putInt(key, value); editor.commit(); } public static void saveDataToSharedpreference(Context mContext, String spName, String key, long value){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_WRITEABLE); SharedPreferences.Editor editor = sPreferences.edit(); editor.putLong(key, value); editor.commit(); } public static void saveDataToSharedpreference(Context mContext, String spName, String key, float value){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_WRITEABLE); SharedPreferences.Editor editor = sPreferences.edit(); editor.putFloat(key, value); editor.commit(); } public static Boolean getBooleanValueFromSharedPreference(Context mContext, String spName, String key){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_READABLE); return sPreferences.getBoolean(key, false); } public static Boolean getBooleanValueFromSharedPreference(Context mContext, String spName, String key,boolean value){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_READABLE); return sPreferences.getBoolean(key, value); } public static String getStringValueFromSharedPreference(Context mContext, String spName, String key, String value){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_READABLE); return sPreferences.getString(key, value); } public static int getIntValueFromSharedPreference(Context mContext, String spName, String key, int value){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_READABLE); return sPreferences.getInt(key, value); } public static long getLongValueFromSharedPreference(Context mContext, String spName, String key, long value){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_READABLE); return sPreferences.getLong(key, value); } public static float getFloatValueFromSharedPreference(Context mContext, String spName, String key, float value){ SharedPreferences sPreferences = mContext.getSharedPreferences(spName, Context.MODE_WORLD_READABLE); return sPreferences.getFloat(key, value); }} 0 0
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