add list of minio objects

.idea/misc.xml

@@ -3,7 +3,8 @@
   <component name="DesignSurface">
     <option name="filePathToZoomLevelMap">
       <map>
-        <entry key="app/src/main/res/layout/activity_main.xml" value="0.1" />
+        <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
+        <entry key="app/src/main/res/layout/main_object_list_entry.xml" value="0.5505208333333333" />
         <entry key="app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml" value="0.3353846153846154" />
         <entry key="app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml" value="0.3353846153846154" />
       </map>

app/src/main/java/de/clkl/android/miniofotoapp/MainActivity.java

@@ -17,20 +17,33 @@ import androidx.activity.result.contract.ActivityResultContracts;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.content.FileProvider;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
 
 import java.io.File;
 import java.io.IOException;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
 import java.text.SimpleDateFormat;
+import java.util.ArrayList;
 import java.util.Date;
+import java.util.List;
 import java.util.Locale;
 
 import io.minio.BucketExistsArgs;
+import io.minio.ListObjectsArgs;
 import io.minio.MakeBucketArgs;
 import io.minio.MinioClient;
+import io.minio.Result;
 import io.minio.UploadObjectArgs;
+import io.minio.errors.ErrorResponseException;
+import io.minio.errors.InsufficientDataException;
+import io.minio.errors.InternalException;
+import io.minio.errors.InvalidResponseException;
 import io.minio.errors.MinioException;
+import io.minio.errors.ServerException;
+import io.minio.errors.XmlParserException;
+import io.minio.messages.Item;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -41,6 +54,9 @@ public class MainActivity extends AppCompatActivity {
 	private MinioClient minio;
 	private String bucket;
 	private ActivityResultLauncher<Intent> photoLauncher;
+	private RecyclerView objectList;
+	private ArrayList<String> objectNames;
+	private ObjectListAdapter objectListAdapter;
 
 
 	@Override
@@ -48,6 +64,14 @@ public class MainActivity extends AppCompatActivity {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_main);
 		thumb = findViewById(R.id.imageView);
+
+		// list of all objects in bucket
+		objectList = findViewById(R.id.objectList);
+		objectNames = new ArrayList<>();
+		objectListAdapter = new ObjectListAdapter(objectNames);
+		objectList.setAdapter(objectListAdapter);
+		objectList.setLayoutManager(new LinearLayoutManager(this));
+
 		minio = MinioClient.builder()
 				.endpoint(getString(R.string.minio_host))
 				.credentials(getString(R.string.minio_access_key), getString(R.string.minio_secret_key))
@@ -63,10 +87,36 @@ public class MainActivity extends AppCompatActivity {
 						handlePhotoCallback();
 					}
 				});
+		listObjects();
+	}
+
+	private void listObjects() {
+		Runnable listObjects = new Runnable() {
+			@Override
+			public void run() {
+				Iterable<Result<Item>> objects = minio.listObjects(ListObjectsArgs.builder().bucket(bucket).prefix("Photos/").build());
+				objectNames.clear();
+				for (Result<Item> object : objects) {
+					try {
+						Item item = object.get();
+						objectNames.add(item.objectName());
+						Log.i(TAG, "list: '" + item.objectName() + "' is dir?: "+ item.isDir());
+					} catch (InvalidKeyException | IOException | NoSuchAlgorithmException | MinioException e) {
+						e.printStackTrace();
+						Log.e(TAG, "something went wrong with minio", e);
+					}
+				}
+				runOnUiThread(() -> {
+					objectListAdapter.notifyDataSetChanged();
+				});
+			}
+		};
+		new Thread(listObjects).start();
 	}
 
 	private static void checkOrCreateBucket(MinioClient client, String bucket) {
 		Runnable check = () -> { // lambda syntax: short for `new Runnable{}`
+			// network IO is not allowed in UI-Thread, needs to be run separately
 			try {
 				boolean isPresent = client.bucketExists(BucketExistsArgs.builder().bucket(bucket).build());
 				if (!isPresent) {
@@ -80,6 +130,7 @@ public class MainActivity extends AppCompatActivity {
 				Log.e(TAG, "something went wrong with minio", e);
 			}
 		};
+		// here, we just start a new Thread. Better: use a service with an interface for separation of concerns
 		new Thread(check).start();
 	}
 
@@ -137,7 +188,7 @@ public class MainActivity extends AppCompatActivity {
 		Runnable upload = () -> {
 
 			try {
-				String filename = currentPhotoPath.substring(currentPhotoPath.lastIndexOf("/"));
+				String filename = "Photos/" + currentPhotoPath.substring(currentPhotoPath.lastIndexOf("/"));
 				minio.uploadObject(UploadObjectArgs.builder().bucket(bucket).object(filename).filename(currentPhotoPath).build());
 			} catch (InvalidKeyException | IOException | NoSuchAlgorithmException | MinioException e) {
 				e.printStackTrace();
@@ -145,6 +196,7 @@ public class MainActivity extends AppCompatActivity {
 			}
 		};
 		new Thread(upload).start();
+		listObjects();
 	}
 
 	public void onButtonClick(View view) {

app/src/main/java/de/clkl/android/miniofotoapp/ObjectListAdapter.java

@@ -0,0 +1,60 @@
+package de.clkl.android.miniofotoapp;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class ObjectListAdapter extends RecyclerView.Adapter<ObjectListAdapter.ViewHolder> {
+	private List<String> objects;
+	private static List<String> IMAGE_FILE_TYPES = Arrays.asList(".jpg", ".png");
+
+	private static boolean isImage(String name){
+		return IMAGE_FILE_TYPES.stream().anyMatch(s -> name.toLowerCase().endsWith(s));
+	}
+
+	public ObjectListAdapter(List<String> objects) {
+		this.objects = objects;
+	}
+
+
+	@NonNull
+	@Override
+	public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+		Context ctx = parent.getContext();
+		LayoutInflater inflater = LayoutInflater.from(ctx);
+
+		View objectView = inflater.inflate(R.layout.main_object_list_entry, parent, false);
+		ViewHolder viewHolder = new ViewHolder(objectView);
+		return viewHolder;
+	}
+
+	@Override
+	public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
+		String object = objects.get(position);
+		holder.name.setText(object);
+	}
+
+	@Override
+	public int getItemCount() {
+		return objects.size();
+	}
+
+	public class ViewHolder extends RecyclerView.ViewHolder {
+		private final TextView name;
+		private final View thumb;
+
+		public ViewHolder(@NonNull View itemView) {
+			super(itemView);
+			name = itemView.findViewById(R.id.objectListContent);
+			thumb = itemView.findViewById(R.id.objectListImage);
+		}
+	}
+}

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

@@ -6,38 +6,36 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
-
     <Button
         android:id="@+id/button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginStart="148dp"
+        android:layout_marginStart="16dp"
-        android:layout_marginTop="112dp"
+        android:layout_marginTop="16dp"
-        android:text="@string/button"
         android:onClick="onButtonClick"
+        android:text="@string/button"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
     <ImageView
-        android:contentDescription="@string/thumbnail"
         android:id="@+id/imageView"
-        android:layout_width="match_parent"
+        android:layout_width="372dp"
-        android:layout_height="match_parent"
+        android:layout_height="259dp"
-        android:layout_marginStart="40dp"
+        android:layout_marginStart="8dp"
-        android:layout_marginTop="56dp"
+        android:layout_marginTop="36dp"
+        android:adjustViewBounds="false"
+        android:contentDescription="@string/thumbnail"
+        android:scaleType="fitCenter"
         app:layout_constraintStart_toStartOf="@+id/button"
         app:layout_constraintTop_toBottomOf="@+id/button"
-        app:srcCompat="@android:drawable/ic_dialog_alert"
+        app:srcCompat="@android:drawable/ic_dialog_alert" />
-        android:adjustViewBounds="false"
+
-        android:scaleType="fitCenter"
+    <androidx.recyclerview.widget.RecyclerView
-        />
+        android:id="@+id/objectList"
+        android:layout_width="409dp"
+        android:layout_height="354dp"
+        android:layout_marginTop="12dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/imageView" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:orientation="horizontal"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <TextView
+        android:id="@+id/objectListContent"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1" />
+
+    <ImageView
+        android:id="@+id/objectListImage"
+        android:layout_width="24dp"
+        android:layout_height="24dp"
+        android:layout_weight="1"
+        app:srcCompat="@android:drawable/ic_dialog_info" />
+</LinearLayout>

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:7.0.1"
+        classpath 'com.android.tools.build:gradle:7.0.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files