code: package com.lody.virtual.server.notification;
  
  import android.content.Context;
  import android.os.Build;
  import android.util.TypedValue;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.FrameLayout;
  import android.widget.LinearLayout;
  
  import com.lody.virtual.helper.utils.OSUtils;
  
  /**
   * Created by 247321453 on 2016/7/17.
   * notification's width
   */
  
  /* package */ class WidthCompat {
      private final static String TAG = WidthCompat.class.getSimpleName();
      private volatile int mWidth = 0;
  
      public int getNotificationWidth(Context context, int width, int height, int padding) {
          if (mWidth > 0) {
              return mWidth;
          }
          int w = getDefaultWidth(width, padding);
          if (OSUtils.getInstance().isEmui()) {
              // huawei's emui
              w = getEMUINotificationWidth(context, width, height);
          } else if (OSUtils.getInstance().isMiui()) {
              if (Build.VERSION.SDK_INT >= 21) {
                  padding = Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f,
                          context.getResources().getDisplayMetrics()));
                  w = getMIUINotificationWidth(context, width - padding * 2, height);
              } else {
                  padding = Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 25f,
                          context.getResources().getDisplayMetrics()));
                  w = getMIUINotificationWidth(context, width - padding * 2, height);
              }
          }
          mWidth = w;
          return w;
      }
  
      private int getDefaultWidth(int width, int padding) {
          if (Build.VERSION.SDK_INT >= 21)
              return width - padding * 2;
          return width;
      }
  
  
      private int getMIUINotificationWidth(Context context, int width, int height) {
          // status_bar_notification_row
          // adaptive
          // content
          try {
              Context systemUi = context.createPackageContext(NotificationCompat.SYSTEM_UI_PKG,
                      Context.CONTEXT_IGNORE_SECURITY | Context.CONTEXT_INCLUDE_CODE);
              int layoutId = getSystemId(systemUi, "status_bar_notification_row", "layout");
              // status_bar_notification_row
              if (layoutId != 0) {
                  ViewGroup viewGroup = createViewGroup(systemUi, layoutId);
  
                  int lid = getSystemId(systemUi, "adaptive", "id");
                  if (lid == 0) {
                      lid = getSystemId(systemUi, "content", "id");
                  } else {
                      // miui5的子view不存在的空指针
                      View child = viewGroup.findViewById(lid);
                      if (child != null && child instanceof ViewGroup) {
                          ((ViewGroup) child).addView(new View(systemUi));
                      }
                  }
                  layout(viewGroup, width, height);
                  if (lid != 0) {
                      View child = viewGroup.findViewById(lid);
                      if (child != null) {
                          return width - child.getLeft() - child.getPaddingLeft() - child.getPaddingRight();
                      }
                  } else {
                      int count = viewGroup.getChildCount();
                      for (int i = 0; i < count; i++) {
                          View child = viewGroup.getChildAt(i);
                          if (FrameLayout.class.isInstance(child) || "LatestItemView".equals(child.getClass().getName())
                                  || "SizeAdaptiveLayout".equals(child.getClass().getName())) {
                              return width - child.getLeft() - child.getPaddingLeft() - child.getPaddingRight();// (LinearLayout)child;
                          }
                      }
                  }
              }
          } catch (Exception e) {
              // ignore
          }
          return width;
      }
  
      /**
       * emui 3.0
       */
      private int getEMUINotificationWidth(Context context, int width, int height) {
          try {
              Context systemUi = context.createPackageContext(NotificationCompat.SYSTEM_UI_PKG,
                      Context.CONTEXT_IGNORE_SECURITY | Context.CONTEXT_INCLUDE_CODE);
              int layoutId = getSystemId(systemUi, "time_axis", "layout");
              if (layoutId != 0) {
                  ViewGroup viewGroup = createViewGroup(systemUi, layoutId);
                  layout(viewGroup, width, height);
                  int lid = getSystemId(systemUi, "content_view_group", "id");
                  if (lid != 0) {
                      View child = viewGroup.findViewById(lid);
                      return width - child.getLeft() - child.getPaddingLeft() - child.getPaddingRight();
                  } else {
                      int count = viewGroup.getChildCount();
                      for (int i = 0; i < count; i++) {
                          View child = viewGroup.getChildAt(i);
                          if (LinearLayout.class.isInstance(child)) {
                              // (LinearLayout)child;
                              return width - child.getLeft() - child.getPaddingLeft() - child.getPaddingRight();
                          }
                      }
                  }
              }
          } catch (Exception e) {
              // ignore
          }
          return width;
      }
  
      private int getSystemId(Context systemUi, String name, String type) {
          return systemUi.getResources().getIdentifier(name, type, NotificationCompat.SYSTEM_UI_PKG);
      }
  
      private ViewGroup createViewGroup(Context context, int layoutId) {
          try {
              return (ViewGroup) LayoutInflater.from(context).inflate(layoutId, null);
          } catch (Throwable e) {
              // ignore
          }
          return new FrameLayout(context);
      }
  
      private void layout(View view, int width, int height) {
          view.layout(0, 0, width, height);
          view.measure(View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.AT_MOST),
                  View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.AT_MOST));
          view.layout(0, 0, width, height);
      }
  }
  