Android开发——DeviceUtil,获取Android设备信息的工具类
Android 设备工具DeviceUtil Android 设备工具DeviceUtil dp转换px px转换dp 设备宽度 设备高度 SD卡判断 网络判断 VersionName VersionCode DeviceId 手机品牌 手机型号 系统Android API等级 系统Android 版本 App进程id App进程Name 创建App缓存文件夹 Uri转换File 获取AndroidManifestxml里meta data的值 DeviceUtil全部源码 dp转换px 在自定义View中必须用到这个方法。自定义View的时候,不能像在xml那样可以设置dp(密度),只能设置px(像素)。不同分辨率的设备,设置px,显示就不会一样了。为了结合设计图设置dp,需要将dp转换为px值,然后再设置。 Java" hljs="" java=""> /** * dp 转化为 px * @param context * @param dpValue * @return */ public static int dp2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } px转换dp /** * px 转化为 dp * @param context * @param pxValue * @return */ public static int px2dp(Context context, float pxValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (pxValue / scale + 0.5f); } 设备宽度 /** * 获取设备宽度(px) * @param context * @return */ public static int deviceWidth(Context context) { return context.getResources().getDisplayMetrics().widthPixels; } 设备高度 /** * 获取设备高度(px) * @param context * @return */ public static int deviceHeight(Context context) { return context.getResources().getDisplayMetrics().heightPixels; } SD卡判断 /** * SD卡判断 * @return */ public static boolean isSDCardAvailable() { return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); } 网络判断 /** * 是否有网 * @param context * @return */ public static boolean isNetworkConnected(Context context) { if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mNetworkInfo = mConnectivityManager .getActiveNetworkInfo(); if (mNetworkInfo != null) { return mNetworkInfo.isAvailable(); } } return false; } VersionName 对应build.gradle中的versionName /** * 返回版本名字 * 对应build.gradle中的versionName * * @param context * @return */ public static String getVersionName(Context context) { String versionName = ; try { PackageManager packageManager = context.getPackageManager(); PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0); versionName = packInfo.versionName; } catch (Exception e) { e.printStackTrace(); } return versionName; } VersionCode 对应build.gradle中的versionCode /** * 返回版本号 * 对应build.gradle中的versionCode * * @param context * @return */ public static String getVersionCode(Context context) { String versionCode = ; try { PackageManager packageManager = context.getPackageManager(); PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0); versionCode = String.valueOf(packInfo.versionCode); } catch (Exception e) { e.printStackTrace(); } return versionCode; } DeviceId 每台设备都有唯一的标识,这就是DeviceId /** * 获取设备的唯一标识,deviceId * * @param context * @return */ public static String getDeviceId(Context context) { TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); String deviceId = tm.getDeviceId(); if (deviceId == null) { return -; } else { return deviceId; } } 手机品牌 /** * 获取手机品牌 * * @return */ public static String getPhoneBrand() { return android.os.Build.BRAND; } 手机型号 /** * 获取手机型号 * * @return */ public static String getPhoneModel() { return android.os.Build.MODEL; } 系统Android API等级 /** * 获取手机Android API等级(22、23 ...) * * @return */ public static int getBuildLevel() { return android.os.Build.VERSION.SDK_INT; } 系统android-版本">系统Android 版本 /** * 获取手机Android 版本(4.4、5.0、5.1 ...) * * @return */ public static String getBuildVersion() { return android.os.Build.VERSION.RELEASE; } App进程id /** * 获取当前App进程的id * * @return */ public static int getAppProcessId() { return android.os.Process.myPid(); } App进程Name /** * 获取当前App进程的Name * * @param context * @param processId * @return */ public static String getAppProcessName(Context context, int processId) { String processName = null; ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); // 获取所有运行App的进程集合 List l = am.getRunningAppProcesses(); Iterator i = l.iterator(); PackageManager pm = context.getPackageManager(); while (i.hasNext()) { ActivityManager.RunningAppProcessInfo info = (ActivityManager.RunningAppProcessInfo) (i.next()); try { if (info.pid == processId) { CharSequence c = pm.getApplicationLabel(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA)); processName = info.processName; return processName; } } catch (Exception e) { Log.e(DeviceUtil.class.getName(), e.getMessage(), e); } } return processName; } 创建App缓存文件夹 /** * 创建App文件夹 * * @param appName * @param application * @return */ public static String createAPPFolder(String appName, Application application) { return createAPPFolder(appName, application, null); } /** * 创建App文件夹 * * @param appName * @param application * @param folderName * @return */ public static String createAPPFolder(String appName, Application application, String folderName) { File root = Environment.getExternalStorageDirectory(); File folder; /** * 如果存在SD卡 */ if (DeviceUtil.isSDCardAvailable() && root != null) { folder = new File(root, appName); if (!folder.exists()) { folder.mkdirs(); } } else { /** * 不存在SD卡,就放到缓存文件夹内 */ root = application.getCacheDir(); folder = new File(root, appName); if (!folder.exists()) { folder.mkdirs(); } } if (folderName != null) { folder = new File(folder, folderName); if (!folder.exists()) { folder.mkdirs(); } } return folder.getAbsolutePath(); } Uri转换File /** * 通过Uri找到File * * @param context * @param uri * @return */ public static File uri2File(Activity context, Uri uri) { File file; String[] project = {MediaStore.Images.Media.DATA}; Cursor actualImageCursor = context.getContentResolver().query(uri, project, null, null, null); if (actualImageCursor != null) { int actual_image_column_index = actualImageCursor .getColumnIndexOrThrow(MediaStore.Images.Media.DATA); actualImageCursor.moveToFirst(); String img_path = actualImageCursor .getString(actual_image_column_index); file = new File(img_path); } else { file = new File(uri.getPath()); } if (actualImageCursor != null) actualImageCursor.close(); return file; } 获取AndroidManifest.xml里meta data的值 AndroidManifest.xml 比如自定义了一个 meta-data ,名为DEBUG。 build.gradle 然后在build.gradle里给这个DEBUG赋值了。 //渠道Flavors productFlavors { APPTest { applicationId com.zyy.camnter.newlife manifestPlaceholders = [DEBUG : debug] } } 可以通过一下方法取得AndroidManifest.xml里DEBUG被赋上的值: /** * 获取AndroidManifest.xml里 的值 * * @param context * @param name * @return */ public static String getMetaData(Context context, String name) { String value = null; try { ApplicationInfo appInfo = context.getPackageManager().getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA); value = appInfo.metaData.getString(name); } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return value; } DeviceUtil全部源码 public class DeviceUtil { /** * dp 转化为 px * * @param context * @param dpValue * @return */ public static int dp2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } /** * px 转化为 dp * * @param context * @param pxValue * @return */ public static int px2dp(Context context, float pxValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (pxValue / scale + 0.5f); } /** * 获取设备宽度(px) * * @param context * @return */ public static int deviceWidth(Context context) { return context.getResources().getDisplayMetrics().widthPixels; } /** * 获取设备高度(px) * * @param context * @return */ public static int deviceHeight(Context context) { return context.getResources().getDisplayMetrics().heightPixels; } /** * SD卡判断 * * @return */ public static boolean isSDCardAvailable() { return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); } /** * 是否有网 * * @param context * @return */ public static boolean isNetworkConnected(Context context) { if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mNetworkInfo = mConnectivityManager .getActiveNetworkInfo(); if (mNetworkInfo != null) { return mNetworkInfo.isAvailable(); } } return false; } /** * 返回版本名字 * 对应build.gradle中的versionName * * @param context * @return */ public static String getVersionName(Context context) { String versionName = ; try { PackageManager packageManager = context.getPackageManager(); PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0); versionName = packInfo.versionName; } catch (Exception e) { e.printStackTrace(); } return versionName; } /** * 返回版本号 * 对应build.gradle中的versionCode * * @param context * @return */ public static String getVersionCode(Context context) { String versionCode = ; try { PackageManager packageManager = context.getPackageManager(); PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0); versionCode = String.valueOf(packInfo.versionCode); } catch (Exception e) { e.printStackTrace(); } return versionCode; } /** * 获取设备的唯一标识,deviceId * * @param context * @return */ public static String getDeviceId(Context context) { TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); String deviceId = tm.getDeviceId(); if (deviceId == null) { return -; } else { return deviceId; } } /** * 获取手机品牌 * * @return */ public static String getPhoneBrand() { return android.os.Build.BRAND; } /** * 获取手机型号 * * @return */ public static String getPhoneModel() { return android.os.Build.MODEL; } /** * 获取手机Android API等级(22、23 ...) * * @return */ public static int getBuildLevel() { return android.os.Build.VERSION.SDK_INT; } /** * 获取手机Android 版本(4.4、5.0、5.1 ...) * * @return */ public static String getBuildVersion() { return android.os.Build.VERSION.RELEASE; } /** * 获取当前App进程的id * * @return */ public static int getAppProcessId() { return android.os.Process.myPid(); } /** * 获取当前App进程的Name * * @param context * @param processId * @return */ public static String getAppProcessName(Context context, int processId) { String processName = null; ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); // 获取所有运行App的进程集合 List l = am.getRunningAppProcesses(); Iterator i = l.iterator(); PackageManager pm = context.getPackageManager(); while (i.hasNext()) { ActivityManager.RunningAppProcessInfo info = (ActivityManager.RunningAppProcessInfo) (i.next()); try { if (info.pid == processId) { CharSequence c = pm.getApplicationLabel(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA)); processName = info.processName; return processName; } } catch (Exception e) { Log.e(DeviceUtil.class.getName(), e.getMessage(), e); } } return processName; } /** * 创建App文件夹 * * @param appName * @param application * @return */ public static String createAPPFolder(String appName, Application application) { return createAPPFolder(appName, application, null); } /** * 创建App文件夹 * * @param appName * @param application * @param folderName * @return */ public static String createAPPFolder(String appName, Application application, String folderName) { File root = Environment.getExternalStorageDirectory(); File folder; /** * 如果存在SD卡 */ if (DeviceUtil.isSDCardAvailable() && root != null) { folder = new File(root, appName); if (!folder.exists()) { folder.mkdirs(); } } else { /** * 不存在SD卡,就放到缓存文件夹内 */ root = application.getCacheDir(); folder = new File(root, appName); if (!folder.exists()) { folder.mkdirs(); } } if (folderName != null) { folder = new File(folder, folderName); if (!folder.exists()) { folder.mkdirs(); } } return folder.getAbsolutePath(); } /** * 通过Uri找到File * * @param context * @param uri * @return */ public static File uri2File(Activity context, Uri uri) { File file; String[] project = {MediaStore.Images.Media.DATA}; Cursor actualImageCursor = context.getContentResolver().query(uri, project, null, null, null); if (actualImageCursor != null) { int actual_image_column_index = actualImageCursor .getColumnIndexOrThrow(MediaStore.Images.Media.DATA); actualImageCursor.moveToFirst(); String img_path = actualImageCursor .getString(actual_image_column_index); file = new File(img_path); } else { file = new File(uri.getPath()); } if (actualImageCursor != null) actualImageCursor.close(); return file; } /** * 获取AndroidManifest.xml里 的值 * * @param context * @param name * @return */ public static String getMetaData(Context context, String name) { String value = null; try { ApplicationInfo appInfo = context.getPackageManager().getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA); value = appInfo.metaData.getString(name); } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return value; } }