Android开发辅助工具类
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文章转自http://blog.csdn.net/smartbetter/article/details/52709446
本篇用于分享Android开发辅助工具类,用于快速开发,以便减少做重复的工作,提高开发效率。项目代码长期更新于Github:https://github.com/smartbetter/Android-UtilsLibrary
1.AppUtils(App相关辅助类)
public class AppUtils { private AppUtils() { 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 (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return null; } /** * 获取应用程序版本名称信息 */ public static String getVersionName(Context context) { try { PackageManager packageManager = context.getPackageManager(); PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), 0); return packageInfo.versionName; // 当前应用的版本名称 } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return null; }}
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2.CameraUtils(摄像头相关辅助类)
public class CameraUtils { private CameraUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } /** * 判断摄像头是否可用 */ public static boolean isCameraCanUse() { boolean canUse = true; Camera mCamera = null; try { mCamera = Camera.open(); // setParameters 是针对魅族MX5 做的。MX5 通过Camera.open() 拿到的Camera // 对象不为null Camera.Parameters mParameters = mCamera.getParameters(); mCamera.setParameters(mParameters); } catch (Exception e) { canUse = false; } if (mCamera != null) { mCamera.release(); } return canUse; }}
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3.DensityUtils(android dp和px之间转换)
public class DensityUtils { private DensityUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } /** * 根据手机的分辨率从 dip 的单位 转成为 px(像素) */ public static int qip2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } /** * 根据手机的分辨率从 px(像素) 的单位 转成为 dp */ public static int px2dip(Context context, float pxValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (pxValue / scale + 0.5f); }}
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4.FileUtils(文件的基本操作)
主要封装了一些文件操作的基本方法,包括创建、删除、获取文件大小等。
public class FileUtils { private FileUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } /** * 检查是否存在SD卡 */ public static boolean hasSdcard() { String state = Environment.getExternalStorageState(); if (state.equals(Environment.MEDIA_MOUNTED)) { return true; } else { return false; } } /** * 创建目录 * * @param context * @param dirName 文件夹名称 * @return */ public static File createFileDir(Context context, String dirName) { String filePath; // 如SD卡已存在,则存储;反之存在data目录下 if (hasSdcard()) { // SD卡路径 filePath = Environment.getExternalStorageDirectory() + File.separator + dirName; } else { filePath = context.getCacheDir().getPath() + File.separator + dirName; } File destDir = new File(filePath); if (!destDir.exists()) { boolean isCreate = destDir.mkdirs(); Log.i("FileUtils", filePath + " has created. " + isCreate); } return destDir; } /** * 删除文件(若为目录,则递归删除子目录和文件) * * @param file * @param delThisPath true代表删除参数指定file,false代表保留参数指定file */ public static void delFile(File file, boolean delThisPath) { if (!file.exists()) { return; } if (file.isDirectory()) { File[] subFiles = file.listFiles(); if (subFiles != null) { int num = subFiles.length; // 删除子目录和文件 for (int i = 0; i < num; i++) { delFile(subFiles[i], true); } } } if (delThisPath) { file.delete(); } } /** * 获取文件大小,单位为byte(若为目录,则包括所有子目录和文件) * * @param file * @return */ public static long getFileSize(File file) { long size = 0; if (file.exists()) { if (file.isDirectory()) { File[] subFiles = file.listFiles(); if (subFiles != null) { int num = subFiles.length; for (int i = 0; i < num; i++) { size += getFileSize(subFiles[i]); } } } else { size += file.length(); } } return size; } /** * 保存Bitmap到指定目录 * * @param dir 目录 * @param fileName 文件名 * @param bitmap * @throws IOException */ public static void saveBitmap(File dir, String fileName, Bitmap bitmap) { if (bitmap == null) { return; } File file = new File(dir, fileName); try { file.createNewFile(); FileOutputStream fos = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos); fos.flush(); fos.close(); } catch (IOException e) { e.printStackTrace(); } } /** * 判断某目录下文件是否存在 * * @param dir 目录 * @param fileName 文件名 * @return */ public static boolean isFileExists(File dir, String fileName) { return new File(dir, fileName).exists(); }}
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5.HttpUtils(Http相关辅助类)
public class HttpUtils { private HttpUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } 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,形式:name1=value1&name2=value2 * @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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6.KeyBoardUtils(软键盘相关辅助类)
public class KeyBoardUtils { private KeyBoardUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } /** * 切换软键盘的状态 * 如当前为收起变为弹出,若当前为弹出变为收起 */ public static void toggleKeybord(EditText edittext) { InputMethodManager inputMethodManager = (InputMethodManager) edittext.getContext().getSystemService(Context.INPUT_METHOD_SERVICE); inputMethodManager.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS); } /** * 强制隐藏输入法键盘 */ public static void hideKeybord(EditText edittext) { InputMethodManager inputMethodManager = (InputMethodManager) edittext.getContext().getSystemService(Context.INPUT_METHOD_SERVICE); if (inputMethodManager.isActive()) { inputMethodManager.hideSoftInputFromWindow(edittext.getWindowToken(), 0); } } /** * 强制显示输入法键盘 */ public static void showKeybord(EditText edittext) { InputMethodManager inputMethodManager = (InputMethodManager) edittext.getContext().getSystemService(Context.INPUT_METHOD_SERVICE); inputMethodManager.showSoftInput(edittext, InputMethodManager.SHOW_FORCED); } /** * 输入法是否显示 */ public static boolean isKeybord(EditText edittext) { boolean bool = false; InputMethodManager inputMethodManager = (InputMethodManager) edittext.getContext().getSystemService(Context.INPUT_METHOD_SERVICE); if (inputMethodManager.isActive()) { bool = true; } return bool; }}
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7.LogUtils
public class LogUtils { private LogUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } private static boolean isDebug = false; public static void i(String tag, String msg) { if (isDebug) { Log.i(tag, msg); } } public static void i(Object object, String msg) { if (isDebug) { Log.i(object.getClass().getSimpleName(), msg); } } public static void e(String tag, String msg) { if (isDebug) { Log.e(tag, msg); } } public static void e(Object object, String msg) { if (isDebug) { Log.e(object.getClass().getSimpleName(), msg); } }}
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8.NetUtils(网络相关)
public class NetUtils { private NetUtils() { 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; } /** * 是否有网络,需要加上访问网络状态的权限 */ public static boolean hasNetwork(Context context) { ConnectivityManager con = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo workinfo = con.getActiveNetworkInfo(); if (workinfo == null || !workinfo.isAvailable()) { return false; } return true; } /** * 判断是否是WiFi网络 */ public static boolean isWifiNet(Context context) { ConnectivityManager con = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo workinfo = con.getActiveNetworkInfo(); return workinfo != null && workinfo.getType() == ConnectivityManager.TYPE_WIFI; } /** * 打开网络设置界面 */ public static void openSetting(Activity activity) { //整体 activity.startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS)); //WIFI: //activity.startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS)); //流量: //activity.startActivity(new Intent(android.provider.Settings.ACTION_DATA_ROAMING_SETTINGS)); }}
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9.ScreenUtils(屏幕相关)
public class ScreenUtils { private ScreenUtils() { 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; }}
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10.SDCardUtils(SD卡相关)
public class SDCardUtils { private SDCardUtils() { 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(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(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 */ public static String getRootDirectoryPath() { return Environment.getRootDirectory().getAbsolutePath(); }}
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11.SPUtils
public class SPUtils { private SPUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } /** * 保存文件名 */ public static final String FILE_NAME = "config"; /** * 保存数据的方法,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); //commit同步的,apply异步的 } /** * 获取数据的方法,根据默认值得到数据的类型,然后调用对应方法获取值 */ 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(适配) */ 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 (IllegalArgumentException e) { } catch (IllegalAccessException e) { } catch (InvocationTargetException e) { } editor.commit(); } }}
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12.ToastUtils
public class ToastUtils { private ToastUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } /** * 短时间显示Toast */ public static void showShort(Context context, CharSequence message) { Toast.makeText(context, message, Toast.LENGTH_SHORT).show(); } /** * 长时间显示Toast */ public static void showLong(Context context, CharSequence message) { Toast.makeText(context, message, Toast.LENGTH_LONG).show(); }}
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13.ViewUtils
public class ViewUtils { private ViewUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } /** * 把自身从父View中移除 */ public static void removeSelfFromParent(View view) { if (view != null) { ViewParent parent = view.getParent(); if (parent != null && parent instanceof ViewGroup) { ViewGroup group = (ViewGroup) parent; group.removeView(view); } } } /** * 判断触点是否落在该View上 */ public static boolean isTouchInView(MotionEvent ev, View v) { int[] vLoc = new int[2]; v.getLocationOnScreen(vLoc); float motionX = ev.getRawX(); float motionY = ev.getRawY(); return motionX >= vLoc[0] && motionX <= (vLoc[0] + v.getWidth()) && motionY >= vLoc[1] && motionY <= (vLoc[1] + v.getHeight()); }}
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除了以上常用工具类,还提供了对一些常用开源框架的辅助工具类,如下:
14.GlideUtils(Glide框架相关)
/** * 用Glide框架加载图片的时候根据图片尺寸让ImageView自适应 * Created by gc on 2016/11/6. */public class GlideUtils { private GlideUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } /** * 加载图片 * @param view * @param url * @param targetWidth */ public static void loadImage(ImageView view, String url, final int targetWidth) { Glide.with(view.getContext()) .load(url) .into(new ImageViewTarget<GlideDrawable>(view) { @Override protected void setResource(GlideDrawable resource) { autoFit(view, targetWidth, resource.getIntrinsicWidth(), resource.getIntrinsicHeight()); view.setImageDrawable(resource); } }); } public static void autoFit(ImageView imageView, int targetWidth, int photoWidth, int photoHeight) { float ratio = (targetWidth + 0f) / photoWidth; ViewGroup.LayoutParams params = imageView.getLayoutParams(); if (params == null) { params = new ViewGroup.LayoutParams(targetWidth, (int) (photoHeight * ratio)); } else { params.width = targetWidth; params.height = (int) (photoHeight * ratio); } imageView.setLayoutParams(params); }}
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15.GsonUtils
public class GsonUtils { private GsonUtils() { throw new UnsupportedOperationException("cannot be instantiated"); } /** * 把一个map变成json字符串 * * @param map * @return */ public static String parseMapToJson(Map<?, ?> map) { try { Gson gson = new Gson(); return gson.toJson(map); } catch (Exception e) { } return null; } /** * 把一个json字符串变成对象 * * @param json * @param cls * @return */ public static <T> T parseJsonToBean(String json, Class<T> cls) { Gson gson = new Gson(); T t = null; try { t = gson.fromJson(json, cls); } catch (Exception e) { } return t; } /** * 把json字符串变成map * * @param json * @return */ public static HashMap<String, Object> parseJsonToMap(String json) { Gson gson = new Gson(); Type type = new TypeToken<HashMap<String, Object>>() { }.getType(); HashMap<String, Object> map = null; try { map = gson.fromJson(json, type); } catch (Exception e) { } return map; } /** * 把json字符串变成集合 * params: new TypeToken<List<yourbean>>(){}.getType(), * * @param json * @param type new TypeToken<List<yourbean>>(){}.getType() * @return */ public static List<?> parseJsonToList(String json, Type type) { Gson gson = new Gson(); List<?> list = gson.fromJson(json, type); return list; } /** * 获取json串中某个字段的值,注意,只能获取同一层级的value * * @param json * @param key * @return */ public static String getFieldValue(String json, String key) { if (TextUtils.isEmpty(json)) return null; if (!json.contains(key)) return ""; JSONObject jsonObject = null; String value = null; try { jsonObject = new JSONObject(json); value = jsonObject.getString(key); } catch (JSONException e) { e.printStackTrace(); } return value; }}
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