Lesson 5

app/build.gradle

@@ -5,7 +5,7 @@ android {
     buildToolsVersion "23.0.2"
 
     defaultConfig {
-        applicationId "com.csc.lesson5"
+        applicationId "com.csc.fedorov.file_manager"
         minSdkVersion 15
         targetSdkVersion 23
         versionCode 1
@@ -21,4 +21,5 @@ android {
 
 dependencies {
     compile 'com.android.support:appcompat-v7:23.2.1'
+    compile 'com.android.support:recyclerview-v7:+'
 }

app/src/main/AndroidManifest.xml

@@ -1,14 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.csc.lesson5">
+    package="com.csc.fedorov.file_manager">
+
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".MainActivity">
+        <activity android:name="com.csc.fedorov.file_manager.MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/src/main/java/com/csc/fedorov/file_manager/FilesAdapter.java

@@ -0,0 +1,104 @@
+package com.csc.fedorov.file_manager;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import java.io.File;
+import java.util.List;
+
+/**
+ * Created by roman on 28.03.2016.
+ */
+public class FilesAdapter extends RecyclerView.Adapter<FilesAdapter.ViewHolder> {
+    public List<File> mFiles;
+    private Drawable fileIcon;
+    private Drawable folderIcon;
+    public Context context;
+
+    private static OnItemClickListener clickListener;
+    private static OnItemLongClickListener longClickListener;
+
+
+    public interface OnItemClickListener {
+        void onItemClick(View itemView, int position);
+    }
+
+    public interface OnItemLongClickListener {
+        void onItemLongClick(View itemView, int position);
+    }
+
+    public void setOnItemClickListener(OnItemClickListener listener) {
+        this.clickListener = listener;
+    }
+
+    public void setOnItemLongClickListener(OnItemLongClickListener listener) {
+        this.longClickListener = listener;
+    }
+
+    public static class ViewHolder extends RecyclerView.ViewHolder {
+        public TextView textView;
+        public ImageView imageView;
+
+        public ViewHolder(final View itemView) {
+            super(itemView);
+            textView = (TextView) itemView.findViewById(R.id.file_item_name);
+            imageView = (ImageView) itemView.findViewById(R.id.file_item_image);
+
+            itemView.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    if (clickListener != null)
+                        clickListener.onItemClick(itemView, getLayoutPosition());
+                }
+            });
+
+            itemView.setOnLongClickListener(new View.OnLongClickListener() {
+                @Override
+                public boolean onLongClick(View v) {
+                    if (longClickListener != null) {
+                        longClickListener.onItemLongClick(itemView, getLayoutPosition());
+                    }
+                    return true;
+                }
+            });
+        }
+    }
+
+    public FilesAdapter(List<File> myDataset) {
+        mFiles = myDataset;
+    }
+
+    // Create new views (invoked by the layout manager)
+    @Override
+    public FilesAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        context = parent.getContext();
+        View fileView = LayoutInflater.from(context).inflate(R.layout.file_item, parent, false);
+        folderIcon = ContextCompat.getDrawable(context, R.drawable.folder_icon_512x512);
+        fileIcon = ContextCompat.getDrawable(context, R.drawable.file_icon);
+
+        return new ViewHolder(fileView);
+    }
+
+    // Replace the contents of a view (invoked by the layout manager)
+    @Override
+    public void onBindViewHolder(ViewHolder holder, int position) {
+        holder.textView.setText(mFiles.get(position).getName());
+        if (mFiles.get(position).isDirectory()) {
+            holder.imageView.setImageDrawable(folderIcon);
+        } else {
+            holder.imageView.setImageDrawable(fileIcon);
+        }
+    }
+
+    @Override
+    public int getItemCount() {
+        return mFiles.size();
+    }
+}

app/src/main/java/com/csc/fedorov/file_manager/MainActivity.java

@@ -0,0 +1,83 @@
+package com.csc.fedorov.file_manager;
+
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.os.Environment;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+import android.widget.Toast;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.jar.Manifest;
+
+public class MainActivity extends AppCompatActivity {
+    private RecyclerView recyclerView;
+    private FilesAdapter adapter;
+    private RecyclerView.LayoutManager layoutManager;
+    private File currentFile;
+    private final ArrayList<File> filesList = new ArrayList<>();
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.main_activity);
+
+        currentFile = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
+
+        recyclerView = (RecyclerView) findViewById(R.id.files_recycler_view);
+        final File[] filesArray = currentFile.listFiles();
+        Collections.addAll(filesList, filesArray);
+        adapter = new FilesAdapter(filesList);
+        recyclerView.setAdapter(adapter);
+        recyclerView.setLayoutManager(new LinearLayoutManager(this));
+        adapter.setOnItemClickListener(new FilesAdapter.OnItemClickListener() {
+            @Override
+            public void onItemClick(View itemView, int position) {
+                File clickedFile = filesList.get(position);
+                if (clickedFile.isDirectory()) {
+                    File directoryToOpen = clickedFile.getAbsoluteFile();
+                    ArrayList<File> insideDirectoryList = new ArrayList<>();
+                    Collections.addAll(insideDirectoryList, directoryToOpen.listFiles());
+                    filesList.clear();
+                    filesList.addAll(insideDirectoryList);
+                    adapter.notifyDataSetChanged();
+                }
+            }
+        });
+        adapter.setOnItemLongClickListener(new FilesAdapter.OnItemLongClickListener() {
+            @Override
+            public void onItemLongClick(View itemView, final int position) {
+                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
+                builder.setTitle(R.string.choose_action).setItems(R.array.actions, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int which) {
+                        if (which == 2) {
+                            if (currentFile.delete()) {
+                                Toast.makeText(MainActivity.this, R.string.delete_ok, Toast.LENGTH_LONG).show();
+                                adapter.notifyItemRemoved(position);
+                            } else {
+                                Toast.makeText(MainActivity.this, R.string.delete_not_ok, Toast.LENGTH_LONG).show();
+                            }
+                        }
+                    }
+                });
+                AlertDialog dialog = builder.create();
+                dialog.show();
+            }
+        });
+    }
+
+    @Override
+    public void onBackPressed() {
+        File parentFile = currentFile.getParentFile();
+        ArrayList<File> parentDirectoryList = new ArrayList<>();
+        Collections.addAll(parentDirectoryList, parentFile.listFiles());
+        filesList.clear();
+        filesList.addAll(parentDirectoryList);
+        adapter.notifyDataSetChanged();
+    }
+}

app/src/main/res/layout/file_item.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?android:attr/selectableItemBackground">
+
+    <ImageView
+        android:id="@+id/file_item_image"
+        android:layout_width="@dimen/icon_size"
+        android:layout_height="@dimen/icon_size"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentStart="true"
+        android:contentDescription="@string/file_icon" />
+
+    <TextView
+        android:id="@+id/file_item_name"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_toEndOf="@+id/file_item_image"
+        android:layout_toRightOf="@+id/file_item_image" />
+
+</RelativeLayout>

app/src/main/res/layout/main_activity.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <android.support.v7.widget.RecyclerView
+        android:layout_marginTop="5dp"
+        android:id="@+id/files_recycler_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:scrollbars="vertical" />
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+</LinearLayout>

app/src/main/res/values/dimens.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="icon_size">40dp</dimen>
+</resources>

app/src/main/res/values/strings.xml

@@ -1,3 +1,13 @@
 <resources>
-    <string name="app_name">lesson5</string>
+    <string name="app_name">File manager</string>
+    <string name="file_icon">File icon</string>
+    <string name="choose_action">Choose action</string>
+    <string name="delete_ok">Successfully deleted</string>
+    <string name="delete_not_ok">You can\'t delete this file</string>
+
+    <array name="actions">
+        <item>Open</item>
+        <item>Rename</item>
+        <item>Delete</item>
+    </array>
 </resources>