打开系统文件夹管理系统，显示选择的文件路径

最近要做打开文件，然后读取文件的内容的程序。但是打开系统的文件夹的程序，我上网查了，很多人的程序都是代码量比较大，程序比较复杂， 其实我只是想打开系统文件夹，然后把文件的路径显示出来。 本程序主要程序代码只要7行，很简单。

/* AUTO-GENERATED FILE.  DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found.  It
 * should not be modified by hand.
 */
package android.support.v7.appcompat;

public final class R {
	public static final class anim {
		public static final int abc_fade_in = 0x7f040000;
		public static final int abc_fade_out = 0x7f040001;
		public static final int abc_slide_in_bottom = 0x7f040002;
		public static final int abc_slide_in_top = 0x7f040003;
		public static final int abc_slide_out_bottom = 0x7f040004;
		public static final int abc_slide_out_top = 0x7f040005;
	}
	public static final class attr {
		public static final int actionBarDivider = 0x7f01000f;
		public static final int actionBarItemBackground = 0x7f010010;
		public static final int actionBarSize = 0x7f01000e;
		public static final int actionBarSplitstyle = 0x7f01000c;
		public static final int actionBarstyle = 0x7f01000b;
		public static final int actionBarTabBarstyle = 0x7f010008;
		public static final int actionBarTabstyle = 0x7f010007;
		public static final int actionBarTabTextstyle = 0x7f010009;
		public static final int actionBarWidgetTheme = 0x7f01000d;
		public static final int actionButtonstyle = 0x7f010016;
		public static final int actiondropDownstyle = 0x7f010047;
		public static final int actionLayout = 0x7f01004e;
		public static final int actionMenuTextAppearance = 0x7f010011;
		public static final int actionMenuTextColor = 0x7f010012;
		public static final int actionModeBackground = 0x7f01003c;
		public static final int actionModeCloseButtonstyle = 0x7f01003b;
		public static final int actionModeCloseDrawable = 0x7f01003e;
		public static final int actionModeCopyDrawable = 0x7f010040;
		public static final int actionModeCutDrawable = 0x7f01003f;
		public static final int actionModeFindDrawable = 0x7f010044;
		public static final int actionModePasteDrawable = 0x7f010041;
		public static final int actionModePopupWindowstyle = 0x7f010046;
		public static final int actionModeSelectAllDrawable = 0x7f010042;
		public static final int actionModeShareDrawable = 0x7f010043;
		public static final int actionModeSplitBackground = 0x7f01003d;
		public static final int actionModestyle = 0x7f01003a;
		public static final int actionModeWebSearchDrawable = 0x7f010045;
		public static final int actionOverflowButtonstyle = 0x7f01000a;
		public static final int actionProviderClass = 0x7f010050;
		public static final int actionViewClass = 0x7f01004f;
		public static final int activityChooserViewstyle = 0x7f01006c;
		public static final int background = 0x7f01002f;
		public static final int backgroundSplit = 0x7f010031;
		public static final int backgroundStacked = 0x7f010030;
		public static final int buttonBarButtonstyle = 0x7f010018;
		public static final int buttonBarstyle = 0x7f010017;
		public static final int customNavigationLayout = 0x7f010032;
		public static final int disableChildrenWhenDisabled = 0x7f010054;
		public static final int

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2016-11-21 20:11  OpenFile1.2\
     文件         475  2016-11-18 14:14  OpenFile1.2\.classpath
     文件         847  2016-11-21 19:58  OpenFile1.2\.project
     目录           0  2016-11-21 20:11  OpenFile1.2\.settings\
     文件         177  2016-11-18 14:14  OpenFile1.2\.settings\org.eclipse.jdt.core.prefs
     文件         862  2016-11-18 14:14  OpenFile1.2\AndroidManifest.xml
     目录           0  2016-11-18 14:13  OpenFile1.2\assets\
     目录           0  2016-11-21 20:11  OpenFile1.2\bin\
     文件         862  2016-11-21 19:58  OpenFile1.2\bin\AndroidManifest.xml
     目录           0  2016-11-21 20:11  OpenFile1.2\bin\classes\
     文件     1403228  2016-11-21 20:00  OpenFile1.2\bin\classes.dex
     目录           0  2016-11-21 20:11  OpenFile1.2\bin\classes\android\
     目录           0  2016-11-21 20:11  OpenFile1.2\bin\classes\android\support\
     目录           0  2016-11-21 20:11  OpenFile1.2\bin\classes\android\support\v7\
     目录           0  2016-11-21 20:11  OpenFile1.2\bin\classes\android\support\v7\appcompat\
     文件         629  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$anim.class
     文件        5136  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$attr.class
     文件         763  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$bool.class
     文件         594  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$color.class
     文件        1530  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$dimen.class
     文件        5191  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$drawable.class
     文件        2556  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$id.class
     文件         445  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$integer.class
     文件        1629  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$layout.class
     文件        1141  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$string.class
     文件        9582  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$style.class
     文件        6541  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R$styleable.class
     文件        1015  2016-11-21 19:58  OpenFile1.2\bin\classes\android\support\v7\appcompat\R.class
     目录           0  2016-11-21 20:11  OpenFile1.2\bin\classes\com\
     目录           0  2016-11-21 20:11  OpenFile1.2\bin\classes\com\example\
     目录           0  2016-11-21 20:11  OpenFile1.2\bin\classes\com\example\openfile\
............此处省略83个文件信息