Gyubin-Han/android-file-explorer
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feat: 외장 저장소 접근 기능 구현

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This commit is contained in:
한규빈
2026-01-04 23:09:42 +09:00
parent 23366e8513
commit 8400a519e1
4 changed files with 246 additions and 4 deletions
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210
app/src/main/java/be/gyu/android/file/explorer/MainActivity.java
View File

@@ -1,12 +1,218 @@
package be.gyu.android.file.explorer;
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.storage.StorageManager;
import android.os.storage.StorageVolume;
import android.provider.Settings;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.MimeTypeMap;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.core.content.FileProvider;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements FileAdapter.OnItemClickListener {
private static final int REQUEST_CODE_MANAGE_EXTERNAL_STORAGE = 1;
private RecyclerView recyclerView;
private FileAdapter fileAdapter;
private List<FileItem> fileList;
private File currentDirectory;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
fileList = new ArrayList<>();
fileAdapter = new FileAdapter(fileList);
fileAdapter.setOnItemClickListener(this);
recyclerView.setAdapter(fileAdapter);
if (checkStoragePermission()) {
loadFiles(Environment.getExternalStorageDirectory());
} else {
requestStoragePermission();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
if (item.getItemId() == R.id.select_storage) {
showStorageSelectionDialog();
return true;
}
return super.onOptionsItemSelected(item);
}
private void showStorageSelectionDialog() {
StorageManager storageManager = (StorageManager) getSystemService(STORAGE_SERVICE);
List<StorageVolume> storageVolumes = storageManager.getStorageVolumes();
List<String> volumeNames = new ArrayList<>();
List<File> volumePaths = new ArrayList<>();
for (StorageVolume volume : storageVolumes) {
if (volume.getState().equals(Environment.MEDIA_MOUNTED)) {
File path = volume.getDirectory();
if (path != null) {
volumeNames.add(volume.getDescription(this));
volumePaths.add(path);
}
}
}
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Select Storage");
builder.setItems(volumeNames.toArray(new String[0]), (dialog, which) -> {
loadFiles(volumePaths.get(which));
});
builder.show();
}
private boolean checkStoragePermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
return Environment.isExternalStorageManager();
} else {
return ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;
}
}
private void requestStoragePermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
try {
Intent intent = new Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION);
intent.addCategory("android.intent.category.DEFAULT");
intent.setData(Uri.parse(String.format("package:%s", getApplicationContext().getPackageName())));
startActivityForResult(intent, REQUEST_CODE_MANAGE_EXTERNAL_STORAGE);
} catch (Exception e) {
Intent intent = new Intent();
intent.setAction(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
startActivityForResult(intent, REQUEST_CODE_MANAGE_EXTERNAL_STORAGE);
}
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, REQUEST_CODE_MANAGE_EXTERNAL_STORAGE);
}
}
private void loadFiles(File directory) {
this.currentDirectory = directory;
if (directory != null) {
setTitle(directory.getName());
fileList.clear();
File[] files = directory.listFiles();
if (files != null) {
for (File file : files) {
fileList.add(new FileItem(file.getName(), file.getAbsolutePath(), file.isDirectory()));
}
} else {
Toast.makeText(this, "Cannot read this directory!", Toast.LENGTH_SHORT).show();
}
}
fileAdapter.notifyDataSetChanged();
}
@Override
public void onItemClick(FileItem item) {
File file = new File(item.getPath());
if (file.isDirectory()) {
if (file.canRead()) {
loadFiles(file);
} else {
Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show();
}
} else {
openFile(file);
}
}
private void openFile(File file) {
Uri uri = FileProvider.getUriForFile(this, getApplicationContext().getPackageName() + ".provider", file);
Intent intent = new Intent(Intent.ACTION_VIEW);
String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(uri.toString()));
intent.setDataAndType(uri, mime);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
try {
startActivity(intent);
} catch (Exception e) {
Toast.makeText(this, "Cannot open file", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onBackPressed() {
// Check against all storage volume roots
StorageManager storageManager = (StorageManager) getSystemService(STORAGE_SERVICE);
List<StorageVolume> storageVolumes = storageManager.getStorageVolumes();
boolean isAtRootOfAVolume = false;
for (StorageVolume volume : storageVolumes) {
File volumePath = volume.getDirectory();
if (volumePath != null && currentDirectory.equals(volumePath)) {
isAtRootOfAVolume = true;
break;
}
}
if (currentDirectory != null && !isAtRootOfAVolume) {
loadFiles(currentDirectory.getParentFile());
} else {
super.onBackPressed();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_CODE_MANAGE_EXTERNAL_STORAGE) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
loadFiles(Environment.getExternalStorageDirectory());
} else {
Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE_MANAGE_EXTERNAL_STORAGE) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
if (Environment.isExternalStorageManager()) {
loadFiles(Environment.getExternalStorageDirectory());
} else {
Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show();
}
}
}
}
}

10
app/src/main/res/drawable/ic_storage.xml Normal file
View File

@@ -0,0 +1,10 @@
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportWidth="24.0"
android:viewportHeight="24.0"
android:tint="?attr/colorControlNormal">
<path
android:fillColor="@android:color/white"
android:pathData="M2,20h20v-4H2v4zm2,-3h2v2H4v-2zM2,4v4h20V4H2zm4,3H4V5h2v2zm-4,7h20v-4H2v4zm2,-3h2v2H4v-2z"/>
</vector>

21
app/src/main/res/layout/activity_main.xml
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@@ -6,9 +6,26 @@
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize" />
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/appBarLayout" />
</androidx.constraintlayout.widget.ConstraintLayout>

9
app/src/main/res/menu/main_menu.xml Normal file
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@@ -0,0 +1,9 @@
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/select_storage"
android:title="Select Storage"
android:icon="@drawable/ic_storage"
app:showAsAction="ifRoom" />
</menu>