- public class CommonUtil {
- public static boolean hasSDCard() {
- String status = Environment.getExternalStorageState();
- return status.equals(Environment.MEDIA_MOUNTED);
- }
- /**
- * 获取最大内存
- *
- * @return
- */
- public static long getMaxMemory() {
- return Runtime.getRuntime().maxMemory() / 1024;
- }
- /**
- * 检查网络
- *
- * @param context
- * @return
- */
- public static boolean checkNetState(Context context) {
- boolean netstate = false;
- ConnectivityManager connectivity = (ConnectivityManager) context
- .getSystemService(Context.CONNECTIVITY_SERVICE);
- if (connectivity != null) {
- NetworkInfo[] info = connectivity.getAllNetworkInfo();
- if (info != null) {
- for (int i = 0; i < info.length; i++) {
- if (info[i].getState() == NetworkInfo.State.CONNECTED) {
- netstate = true;
- break;
- }
- }
- }
- }
- return netstate;
- }
- public static void showToast(Context context, String tip) {
- Toast.makeText(context, tip, Toast.LENGTH_SHORT).show();
- }
- public static DisplayMetrics metric = new DisplayMetrics();
- /**
- * 得到屏幕高度
- *
- * @param context
- * @return
- */
- public static int getScreenHeight(Activity context) {
- context.getWindowManager().getDefaultDisplay().getMetrics(metric);
- return metric.heightPixels;
- }
- /**
- * 得到屏幕宽度
- *
- * @param context
- * @return
- */
- public static int getScreenWidth(Activity context) {
- context.getWindowManager().getDefaultDisplay().getMetrics(metric);
- return metric.widthPixels;
- }
- /**
- * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
- */
- public static int dip2px(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);
- }
- /**
- * 查询手机内非系统应用
- *
- * @param context
- * @return
- */
- public static List<PackageInfo> getAllApps(Context context) {
- List<PackageInfo> apps = new ArrayList<PackageInfo>();
- PackageManager pManager = context.getPackageManager();
- // 获取手机内所有应用
- List<PackageInfo> paklist = pManager.getInstalledPackages(0);
- for (int i = 0; i < paklist.size(); i++) {
- PackageInfo pak = (PackageInfo) paklist.get(i);
- // 判断是否为非系统预装的应用程序
- if ((pak.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) <= 0) {
- // customs applications
- apps.add(pak);
- }
- }
- return apps;
- }
- public static Bitmap zoomBitmap(Bitmap bitmap, int width, int height) {
- int w = bitmap.getWidth();
- int h = bitmap.getHeight();
- Matrix matrix = new Matrix();
- float scaleWidth = ((float) width / w);
- float scaleHeight = ((float) height / h);
- matrix.postScale(scaleWidth, scaleHeight);
- Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);
- return newbmp;
- }
- /**
- * 获取版本号和版本次数
- *
- * @param context
- * @return
- */
- public static String getVersionCode(Context context, int type) {
- try {
- PackageInfo pi = context.getPackageManager().getPackageInfo(
- context.getPackageName(), 0);
- if (type == 1) {
- return String.valueOf(pi.versionCode);
- } else {
- return pi.versionName;
- }
- } catch (NameNotFoundException e) {
- e.printStackTrace();
- return null;
- }
- }
- // 通过Service的类名来判断是否启动某个服务
- public static boolean messageServiceIsStart(
- List<ActivityManager.RunningServiceInfo> mServiceList,
- String className) {
- for (int i = 0; i < mServiceList.size(); i++) {
- if (className.equals(mServiceList.get(i).service.getClassName())) {
- return true;
- }
- }
- return false;
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/2204201512373.html
来源: http://www.codesnippet.cn/detail/2204201512373.html