之前的log打得跟日记一样

1.感觉先显示文件再显示文件夹还是太丑了,改了回来
2.获取外部存储根目录的由直接给路径改成方法调用获取
3.新建了一个NetCheck类,用于检测当前网络状态,但是具体功能并没有实现
4.实现了fragment之间的跳转和数据的传递,即点击文件夹打开该目录,然后发现空目录会发生空指针异常也一并处理了
fragment的跳转和参考官方文档和https://blog.csdn.net/m0_46962786/article/details/109119746,这篇文章,对nav_graph中的filemanagefragment(简称fm)添加了action和argument

完成了文件管理的功能,然后正在删除一些冗余的代码

CloudKey/app/src/main/java/com/thankvinci/CloudKey/Files/FileAdapter.java

@@ -1,5 +1,6 @@
 package com.thankvinci.CloudKey.Files;
 
+import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
@@ -10,15 +11,23 @@ import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentTransaction;
+import androidx.navigation.Navigation;
 import androidx.recyclerview.widget.RecyclerView;
 
+import com.thankvinci.CloudKey.Fragment.FileManageFragment;
 import com.thankvinci.CloudKey.R;
 
+import java.io.File;
 import java.util.List;
 
 public class FileAdapter extends RecyclerView.Adapter<FileAdapter.ViewHolder> {
 
     private List<FileItem> fileList;
+    private Fragment fragment;
+
+    private static FileAdapter adapter;
 
     static class ViewHolder extends RecyclerView.ViewHolder{
         ImageView icon;
@@ -31,19 +40,44 @@ public class FileAdapter extends RecyclerView.Adapter<FileAdapter.ViewHolder> {
           name = file.findViewById(R.id.file_name);
         }
     }
-    public FileAdapter(List<FileItem> fileList){
+    public static FileAdapter getInstance(List<FileItem> fileList,Fragment fragment){
+        if(adapter != null){
+            return adapter;
+        }
+        adapter = new FileAdapter(fileList,fragment);
+        return adapter;
+    }
+    public void setFileList(List<FileItem> fileList){
+        this.fileList = fileList;
+    }
+    public FileAdapter(List<FileItem> fileList,Fragment fragment){
         this.fileList = fileList;
+        this.fragment = fragment;
     }
     @Override
     public FileAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.file_item,parent,false);
         ViewHolder holder = new ViewHolder(view);
+        Bundle data = new Bundle();
+
         holder.file.setOnClickListener(new View.OnClickListener(){
             @Override
             public void onClick(View v){
                 int position = holder.getAdapterPosition();
                 FileItem fitem = fileList.get(position);
-                Toast.makeText(view.getContext(),fitem.getName(),Toast.LENGTH_SHORT).show();
+                Toast.makeText(v.getContext(),fitem.getName(),Toast.LENGTH_SHORT).show();
+                if(fitem.isDir()){
+                    StringBuilder builder = new StringBuilder();
+                    builder.append(((FileManageFragment)fragment).getDir());
+                    builder.append("/");
+                    builder.append(fitem.getName());
+                    data.putString("dir",builder.toString());
+                    data.putBoolean("isRoot",false);
+                    Navigation.findNavController(v).navigate(R.id.action_openDir,data);
+                }else{
+                    Toast.makeText(v.getContext(),"没有打开除文件夹和压缩包以外的功能",Toast.LENGTH_SHORT).show();
+                }
+
             }
         });
         return holder;
@@ -58,6 +92,9 @@ public class FileAdapter extends RecyclerView.Adapter<FileAdapter.ViewHolder> {
 
     @Override
     public int getItemCount() {
+        if (fileList == null){
+            return 0;
+        }
         return fileList.size();
     }
 }

CloudKey/app/src/main/java/com/thankvinci/CloudKey/Files/FileItem.java

@@ -29,4 +29,7 @@ public class FileItem {
     public int getIcon(){
         return icon;
     }
+    public boolean isDir(){
+        return !type;
+    }
 }

CloudKey/app/src/main/java/com/thankvinci/CloudKey/Files/FileUtils.java

@@ -7,19 +7,19 @@ import java.util.Comparator;
 import java.util.List;
 
 public class FileUtils {
-    //按照文件,文件夹,文件名次序的顺序进行排序,参考:https://blog.csdn.net/qq_34246164/article/details/111785553
+    //按照文件夹,文件,文件名次序的顺序进行排序,参考:https://blog.csdn.net/qq_34246164/article/details/111785553
     public static void orderByName(File[] files){
         List fileList = Arrays.asList(files);
         Collections.sort(fileList, new Comparator<File>() {
             @Override
             public int compare(File f1,File f2){
                 if(f1.isDirectory() && f2.isFile()){
-                    return 0;
+                    return -1;
                 }
                 if(f2.isDirectory() && f1.isFile()){
-                    return -1;
+                    return 0;
                 }
-                return f1.getName().compareTo(f2.getName());
+                return (f1.getName().toUpperCase()).compareTo((f2.getName().toUpperCase()));
             }
         });
     }

CloudKey/app/src/main/java/com/thankvinci/CloudKey/Fragment/FileManageFragment.java

@@ -1,10 +1,15 @@
 package com.thankvinci.CloudKey.Fragment;
 
 import android.os.Bundle;
+import android.os.Environment;
+import android.view.LayoutInflater;
 import android.view.View;
+import android.view.ViewGroup;
 import android.widget.EditText;
 import android.widget.Toast;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.core.app.ActivityCompat;
 import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.RecyclerView;
@@ -18,27 +23,48 @@ import com.thankvinci.CloudKey.R;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Stack;
 
 public class FileManageFragment extends Fragment {
 
+    private String dir; //当前fragment加载的目录
+    private boolean isRoot; //是否是根目录布局
+
     private EditText path_edit;
     private RecyclerView directoryView;
-    private List<FileItem> fileItemList = new ArrayList<>();
+    private List<FileItem> fileItemList;
     private String fileNames[];
     private File files[];
 
     public FileManageFragment(){
         super(R.layout.filemanage_fragment);
     }
+
     @Override
     public void onViewCreated(View view,Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
         path_edit = getView().findViewById(R.id.path_name);
         directoryView = (RecyclerView)getView().findViewById(R.id.dir_list);
+
+        Bundle data = getArguments();
+        dir = data.getString("dir");
+        isRoot = data.getBoolean("isRoot");
+        Toast.makeText(getActivity(),dir+isRoot,Toast.LENGTH_SHORT).show();
+        if(isRoot){
             loadRoot();
+        }else{
+            loadDirectory(dir);
+        }
+        initLayout();
+    }
+    public String getDir(){
+        return dir;
+    }
+    private void initLayout(){
         StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL);
         directoryView.setLayoutManager(layoutManager);
-        FileAdapter adapter = new FileAdapter(fileItemList);
+        FileAdapter adapter = FileAdapter.getInstance(fileItemList,this);
+        adapter.setFileList(fileItemList);
         directoryView.setAdapter(adapter);
     }
     private void loadRoot() {
@@ -46,25 +72,39 @@ public class FileManageFragment extends Fragment {
         ActivityCompat.requestPermissions(getActivity(), new String[]{ //运行时权限
                 "android.permission.WRITE_EXTERNAL_STORAGE",
                 "android.permission.READ_EXTERNAL_STORAGE"}, 1);
-        //File root = getActivity().getExternalFilesDir(null);
-        //File root = new File(Environment.getExternalStorageState());
-        File root = new File("/storage/emulated/0");
-        Toast.makeText(getActivity(),root.getAbsolutePath()+"",Toast.LENGTH_SHORT).show();
-        Toast.makeText(getActivity(),root.canRead()+"",Toast.LENGTH_SHORT).show();
+
+        String rootPath = Environment.getExternalStorageDirectory().getPath();
+        dir = rootPath;
+        path_edit.setText(dir);
+        File root = new File(rootPath);
         files = root.listFiles();
+        if (files == null){
+            //当目录里为空时,列表为空对象
+        }else{
             FileUtils.orderByName(files);
-        path_edit.setText("/storage/emulated/0");
+
             initDirectory();
         }
+
+    }
     public void loadDirectory(String path){
         ActivityCompat.requestPermissions(getActivity(), new String[]{ //运行时权限
                 "android.permission.WRITE_EXTERNAL_STORAGE",
                 "android.permission.READ_EXTERNAL_STORAGE"}, 1);
+        path_edit.setText(path);
         File directory = new File(path);
-        Toast.makeText(getActivity(),directory.getAbsolutePath()+"",Toast.LENGTH_SHORT).show();
+        files = directory.listFiles();
+        if (files == null){
+            //当目录里为空时,列表为空对象
+        }else{
+            FileUtils.orderByName(files);
             initDirectory();
         }
+        Toast.makeText(getActivity(),directory.canRead()+"",Toast.LENGTH_SHORT).show();
+    }
     private void initDirectory(){
+        fileItemList = null;
+        fileItemList  = new ArrayList<>();
         String filename,suffix;
         boolean isFile,isZip;
         int lastIndex,index;
@@ -90,8 +130,6 @@ public class FileManageFragment extends Fragment {
             if(index != 0){ //隐藏.开头的隐藏文件
                 FileItem fitem = new FileItem(filename,isFile,isZip);
                 fileItemList.add(fitem);
-            }else{
-
             }
         }
     }

CloudKey/app/src/main/java/com/thankvinci/CloudKey/NetUtils/NetCheck.java

@@ -0,0 +1,4 @@
+package com.thankvinci.CloudKey.NetUtils;
+
+public class NetCheck {
+}

CloudKey/app/src/main/res/layout/filemanage_fragment.xml

@@ -10,10 +10,11 @@
         android:id="@+id/path_name"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:editable="false"
-        android:focusedByDefault="true"
+        android:focusable="false"
         android:text="/emulated/0/sdcard"
         android:textColor="@color/grey"
+        android:textSize="14dp"
+        android:singleLine="true"
         tools:ignore="MissingConstraints" />
 
     <androidx.recyclerview.widget.RecyclerView

CloudKey/app/src/main/res/navigation/nav_graph.xml

@@ -8,7 +8,21 @@
         android:id="@+id/fileManageFragment"
         android:name="com.thankvinci.CloudKey.Fragment.FileManageFragment"
         android:label="目录"
-        tools:layout="@layout/filemanage_fragment" />
+        tools:layout="@layout/filemanage_fragment" >
+        <action
+            android:id="@+id/action_openDir"
+            app:destination="@id/fileManageFragment" />
+        <argument
+            android:name="dir"
+            android:defaultValue=""
+            app:argType="string"
+            app:nullable="true"/>
+        <argument
+            android:name="isRoot"
+            android:defaultValue="true"
+            app:argType="boolean"
+            app:nullable="false"/>
+    </fragment>
     <fragment
         android:id="@+id/aboutFragment"
         android:name="com.thankvinci.CloudKey.Fragment.AboutFragment"

开发历程.md

@@ -186,3 +186,38 @@ implementation 'androidx.navigation:navigation-ui:2.2.2'
 **2021/6/11**
 
 发现物理机的隐藏文件挺多的,于是设置默认隐藏.开头的隐藏文件,关于file类获取当前目录下的子文件,在Windows上默认按文件名排序,但是在Android里却没有,所以要对文件和文件夹以及名字和文件夹进行排序,考虑到我们可能要优先找文件,所以,文件就显示在文件夹前
+
+**2021/6/11**
+
+感觉先文件再文件夹还是太丑了,就改回来了,然后是获取根目录
+
+从File root = new File("/storage/emulated/0");改为:File root = new File(Environment.getExternalStorageDirectory().getPath())
+
+在实现点击recyclerview子项的时候就在想,由于我点击的是自己设计的FileItem类对象,我只能把当前的文件名传出去,却获取不到文件的完整路径,最后我在想,用一个栈来存我每次打开的目录,默认栈顶是根目录,打开一个目录就入栈,退出一个目录就出栈,栈顶为1时,若再退出则弹出Dialog提示是否退出
+
+新建了一个NetCheck类,用于检测当前网络状态,不过并没有实现功能
+
+在完成打开目录的时候,没有考虑到一些问题,比如,返回键,由于我是重新加载布局,所以就变成了按一下返回键就finish()这样的情况,在想要不要设置成每点击一个文件夹就实例化一个fragment
+
+===========================================分割线=====================================
+
+具体流程是这样:
+
+进入APP,默认是根目录,加载布局的时候初始化栈,栈顶是根目录,每打开一个目录就实例化一个布局,然后放到栈顶,每按一次返回就把栈顶的布局弹出并finish(),当到达栈底时,会询问是否退出APP,是则弹栈finish();
+
+程序左边的nav导航中的"我的文件"点击不仅会加载根目录布局,还会直接把栈初始化
+
+打完这几行字后发现自己很蠢,打开,返回finish已经是栈的操作了,要实现的是,fragment之间的跳转
+
+在执行fragment之间跳转的部分卡住了,书上的跳转是一个activity的layout文件的子控件framelayout的跳转,但是这里写的是navHostFragment中的fragment跳转
+
+从官方文档中可以找到
+
+public static final View.OnClickListener createNavigateOnClickListener(@IdRes int resId, @Nullable Bundle args)
+
+第一个参数是在nav_graph中设置的action,我设置了从FM到FM的action,第二个参数是Bundle,用于传递数据
+
+返回一个OnClickListener,但是我是分文件和目录的,这个方法又不能重写,然后又找到了https://blog.csdn.net/m0_46962786/article/details/109119746这篇文章,这里面是在普通的OnClickListener中获取当前的Navigation的controller,然后调用navigate()方法去触发action和传递参数
+
+
+