/***
Copyright (c) 2012-2015 CommonsWare, LLC
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy
of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
by applicable law or agreed to in writing, software distributed under the
License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
OF ANY KIND, either express or implied. See the License for the specific
language governing permissions and limitations under the License.
Covered in detail in the book _The Busy Coder's Guide to Android Development_
https://commonsware.com/Android
*/
package com.commonsware.android.fileseditor;
import android.app.Fragment;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
public class EditorFragment extends Fragment {
private static final String KEY_FILE="file";
private EditText editor;
private LoadTextTask loadTask=null;
private boolean loaded=false;
static EditorFragment newInstance(File fileToEdit) {
EditorFragment frag=new EditorFragment();
Bundle args=new Bundle();
args.putSerializable(KEY_FILE, fileToEdit);
frag.setArguments(args);
return(frag);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
View result=inflater.inflate(R.layout.editor, container, false);
editor=(EditText)result.findViewById(R.id.editor);
return(result);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
if (!loaded) {
loadTask=new LoadTextTask();
loadTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
(File)getArguments().getSerializable(KEY_FILE));
}
}
@Override
public void onPause() {
if (loaded) {
new SaveThread(editor.getText().toString(),
(File)getArguments().getSerializable(KEY_FILE)).start();
}
super.onPause();
}
@Override
public void onDestroy() {
if (loadTask!=null) {
loadTask.cancel(false);
}
super.onDestroy();
}
private class LoadTextTask extends AsyncTask<File, Void, String> {
@Override
protected String doInBackground(File... files) {
String result=null;
if (files[0].exists()) {
BufferedReader br;
try {
br=new BufferedReader(new FileReader(files[0]));
try {
StringBuilder sb=new StringBuilder();
String line=br.readLine();
while (line!=null) {
sb.append(line);
sb.append("\n");
line=br.readLine();
}
result=sb.toString();
}
finally {
br.close();
}
}
catch (IOException e) {
Log.e(getClass().getSimpleName(), "Exception reading file", e);
}
}
return(result);
}
@Override
protected void onPostExecute(String s) {
editor.setText(s);
loadTask=null;
loaded=true;
}
}
private static class SaveThread extends Thread {
private final String text;
private final File fileToEdit;
SaveThread(String text, File fileToEdit) {
this.text=text;
this.fileToEdit=fileToEdit;
}
@Override
public void run() {
try {
fileToEdit.getParentFile().mkdirs();
FileOutputStream fos=new FileOutputStream(fileToEdit);
Writer w=new BufferedWriter(new OutputStreamWriter(fos));
try {
w.write(text);
w.flush();
fos.getFD().sync();
}
finally {
w.close();
}
}
catch (IOException e) {
Log.e(getClass().getSimpleName(), "Exception writing file", e);
}
}
}
}