Remove unused imports.

package com.android.documentsui.dirlist;

import static android.content.ContentResolver.EXTRA_REFRESH_SUPPORTED;

import static com.android.documentsui.base.DocumentInfo.getCursorInt;

import static com.android.documentsui.base.DocumentInfo.getCursorString;

import static com.android.documentsui.base.Shared.DEBUG;

import android.annotation.DimenRes;

import android.annotation.FractionRes;

import android.annotation.IntDef;

import android.annotation.StringRes;

import android.app.Activity;

import android.app.ActivityManager;

import android.app.Fragment;

import android.os.Build;

import android.os.Bundle;

import android.os.Handler;

import android.os.Looper;

import android.os.Parcelable;

import android.provider.DocumentsContract;

import android.provider.DocumentsContract.Document;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ImageView;

import android.widget.TextView;

import com.android.documentsui.ActionHandler;

import com.android.documentsui.ActionModeController;

import com.android.documentsui.Metrics;

import com.android.documentsui.R;

import com.android.documentsui.RecentsLoader;

import com.android.documentsui.RefreshTask;

import com.android.documentsui.ThumbnailCache;

import com.android.documentsui.base.DocumentInfo;

import com.android.documentsui.base.EventHandler;

import com.android.documentsui.services.FileOperations;

import com.android.documentsui.sorting.SortDimension;

import com.android.documentsui.sorting.SortModel;

import com.android.documentsui.ui.DialogController;

import java.io.IOException;

import java.lang.annotation.Retention;