package de.danoeh.antennapod.activity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.os.FileObserver;
import android.support.v4.app.NavUtils;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import de.danoeh.antennapod.BuildConfig;
import de.danoeh.antennapod.R;
import de.danoeh.antennapod.core.preferences.UserPreferences;
/**
* Let's the user choose a directory on the storage device. The selected folder
* will be sent back to the starting activity as an activity result.
*/
public class DirectoryChooserActivity extends AppCompatActivity {
private static final String TAG = "DirectoryChooserActivit";
private static final String CREATE_DIRECTORY_NAME = "AntennaPod";
public static final String RESULT_SELECTED_DIR = "selected_dir";
public static final int RESULT_CODE_DIR_SELECTED = 1;
private Button butConfirm;
private Button butCancel;
private ImageButton butNavUp;
private TextView txtvSelectedFolder;
private ListView listDirectories;
private ArrayAdapter<String> listDirectoriesAdapter;
private ArrayList<String> filenames;
/** The directory that is currently being shown. */
private File selectedDir;
private File[] filesInDir;
private FileObserver fileObserver;
@Override
protected void onCreate(Bundle savedInstanceState) {
setTheme(UserPreferences.getTheme());
super.onCreate(savedInstanceState);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
setContentView(R.layout.directory_chooser);
butConfirm = (Button) findViewById(R.id.butConfirm);
butCancel = (Button) findViewById(R.id.butCancel);
butNavUp = (ImageButton) findViewById(R.id.butNavUp);
txtvSelectedFolder = (TextView) findViewById(R.id.txtvSelectedFolder);
listDirectories = (ListView) findViewById(R.id.directory_list);
butConfirm.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (isValidFile(selectedDir)) {
if (selectedDir.list().length == 0) {
returnSelectedFolder();
} else {
showNonEmptyDirectoryWarning();
}
}
}
private void showNonEmptyDirectoryWarning() {
AlertDialog.Builder adb = new AlertDialog.Builder(
DirectoryChooserActivity.this);
adb.setTitle(R.string.folder_not_empty_dialog_title);
adb.setMessage(R.string.folder_not_empty_dialog_msg);
adb.setNegativeButton(R.string.cancel_label,
(dialog, which) -> {
dialog.dismiss();
});
adb.setPositiveButton(R.string.confirm_label,
(dialog, which) -> {
dialog.dismiss();
returnSelectedFolder();
});
adb.create().show();
}
});
butCancel.setOnClickListener(v -> {
setResult(Activity.RESULT_CANCELED);
finish();
});
listDirectories.setOnItemClickListener((adapter, view, position, id) -> {
Log.d(TAG, "Selected index: " + position);
if (filesInDir != null && position >= 0
&& position < filesInDir.length) {
changeDirectory(filesInDir[position]);
}
});
butNavUp.setOnClickListener(v -> {
File parent = null;
if (selectedDir != null
&& (parent = selectedDir.getParentFile()) != null) {
changeDirectory(parent);
}
});
filenames = new ArrayList<>();
listDirectoriesAdapter = new ArrayAdapter<>(this,
android.R.layout.simple_list_item_1, filenames);
listDirectories.setAdapter(listDirectoriesAdapter);
changeDirectory(Environment.getExternalStorageDirectory());
}
/**
* Finishes the activity and returns the selected folder as a result. The
* selected folder can also be null.
*/
private void returnSelectedFolder() {
if (selectedDir != null && BuildConfig.DEBUG)
Log.d(TAG, "Returning " + selectedDir.getAbsolutePath()
+ " as result");
Intent resultData = new Intent();
if (selectedDir != null) {
resultData.putExtra(RESULT_SELECTED_DIR,
selectedDir.getAbsolutePath());
}
setResult(Activity.RESULT_OK, resultData);
finish();
}
@Override
protected void onPause() {
super.onPause();
if (fileObserver != null) {
fileObserver.stopWatching();
}
}
@Override
protected void onResume() {
super.onResume();
if (fileObserver != null) {
fileObserver.startWatching();
}
}
@Override
public void onStop() {
super.onStop();
listDirectoriesAdapter = null;
fileObserver = null;
}
/**
* Change the directory that is currently being displayed.
*
* @param dir
* The file the activity should switch to. This File must be
* non-null and a directory, otherwise the displayed directory
* will not be changed
*/
private void changeDirectory(File dir) {
if (dir != null && dir.isDirectory()) {
File[] contents = dir.listFiles();
if (contents != null) {
int numDirectories = 0;
for (File f : contents) {
if (f.isDirectory()) {
numDirectories++;
}
}
filesInDir = new File[numDirectories];
filenames.clear();
for (int i = 0, counter = 0; i < numDirectories; counter++) {
if (contents[counter].isDirectory()) {
filesInDir[i] = contents[counter];
filenames.add(contents[counter].getName());
i++;
}
}
Arrays.sort(filesInDir);
Collections.sort(filenames);
selectedDir = dir;
txtvSelectedFolder.setText(dir.getAbsolutePath());
listDirectoriesAdapter.notifyDataSetChanged();
fileObserver = createFileObserver(dir.getAbsolutePath());
fileObserver.startWatching();
Log.d(TAG, "Changed directory to " + dir.getAbsolutePath());
} else {
Log.d(TAG, "Could not change folder: contents of dir were null");
}
} else {
if (dir == null) {
Log.d(TAG, "Could not change folder: dir was null");
} else {
Log.d(TAG, "Could not change folder: dir is no directory");
}
}
refreshButtonState();
}
/**
* Changes the state of the buttons depending on the currently selected file
* or folder.
*/
private void refreshButtonState() {
if (selectedDir != null) {
butConfirm.setEnabled(isValidFile(selectedDir));
supportInvalidateOptionsMenu();
}
}
/** Refresh the contents of the directory that is currently shown. */
private void refreshDirectory() {
if (selectedDir != null) {
changeDirectory(selectedDir);
}
}
/** Sets up a FileObserver to watch the current directory. */
private FileObserver createFileObserver(String path) {
return new FileObserver(path, FileObserver.CREATE | FileObserver.DELETE
| FileObserver.MOVED_FROM | FileObserver.MOVED_TO) {
@Override
public void onEvent(int event, String path) {
Log.d(TAG, "FileObserver received event " + event);
runOnUiThread(DirectoryChooserActivity.this::refreshDirectory);
}
};
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
menu.findItem(R.id.new_folder_item).setVisible(isValidFile(selectedDir));
return true;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.directory_chooser, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
case R.id.new_folder_item:
openNewFolderDialog();
return true;
case R.id.set_to_default_folder_item:
selectedDir = null;
returnSelectedFolder();
return true;
default:
return false;
}
}
/**
* Shows a confirmation dialog that asks the user if he wants to create a
* new folder.
*/
private void openNewFolderDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(R.string.create_folder_label);
builder.setMessage(String.format(getString(R.string.create_folder_msg),
CREATE_DIRECTORY_NAME));
builder.setNegativeButton(R.string.cancel_label,
(dialog, which) -> {
dialog.dismiss();
});
builder.setPositiveButton(R.string.confirm_label,
(dialog, which) -> {
dialog.dismiss();
int msg = createFolder();
Toast t = Toast.makeText(DirectoryChooserActivity.this,
msg, Toast.LENGTH_SHORT);
t.show();
});
builder.create().show();
}
/**
* Creates a new folder in the current directory with the name
* CREATE_DIRECTORY_NAME.
*/
private int createFolder() {
if (selectedDir == null) {
return R.string.create_folder_error;
} else if (selectedDir.canWrite()) {
File newDir = new File(selectedDir, CREATE_DIRECTORY_NAME);
if (!newDir.exists()) {
boolean result = newDir.mkdir();
if (result) {
return R.string.create_folder_success;
} else {
return R.string.create_folder_error;
}
} else {
return R.string.create_folder_error_already_exists;
}
} else {
return R.string.create_folder_error_no_write_access;
}
}
/** Returns true if the selected file or directory would be valid selection. */
private boolean isValidFile(File file) {
return file != null && file.isDirectory() && file.canRead() && file.canWrite();
}
}