chris987 chris987 - 4 months ago 30
Android Question

Cannot resolve symbol `FileUtils` in Codepath `Todo App` tutorial (Android)

I'm trying to follow a

Todo
app tutorial from Codepath (https://guides.codepath.com).

Source: https://guides.codepath.com/android/Basic-Todo-App-Tutorial

As far as I can tell I've followed the tutorial, but am getting the below issue.

Cannot resolve symbol `FileUtils`


MainActivity.Java

package com.codepath.simpletodo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
private ArrayList<String> items;
private ArrayAdapter<String> itemsAdapter;
private ListView lvItems;

private void readItems() {
File filesDir = getFilesDir();
File todoFile = new File(filesDir, "todo.txt");
try {
items = new ArrayList<String>(FileUtils.readLines(todoFile));
} catch (IOException e) {
items = new ArrayList<String>();
}
}

private void writeItems() {
File filesDir = getFilesDir();
File todoFile = new File(filesDir, "todo.txt");
try {
FileUtils.writeLines(todoFile, items);
} catch (IOException e) {
e.printStackTrace();
}
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lvItems = (ListView) findViewById(R.id.lvItems);
items = new ArrayList<String>();
itemsAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, items);
lvItems.setAdapter(itemsAdapter);
items.add("Default item");
items.add("Another default item");
items.add("The third default item");
// setup remove listener method call
setupListViewListener();
}

// Attaches a long click listener to the listview
private void setupListViewListener() {
lvItems.setOnItemLongClickListener(
new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> adapter,
View item, int pos, long id) {
// Remove item within array at position
items.remove(pos);
// Refresh the adapter
itemsAdapter.notifyDataSetChanged();
// Return true consumes the long click event (marks it handled)
return true;
}
});
}

public void onAddItem(View v) {
EditText etNewItem = (EditText) findViewById(R.id.etNewItem);
String itemText = etNewItem.getText().toString();
itemsAdapter.add(itemText);
etNewItem.setText("");
}
}


activity_mail.xml



<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lvItems"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_above="@+id/btnAddItem" />

<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/etNewItem"
android:layout_alignTop="@+id/btnAddItem"
android:hint="Enter a new item"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_toLeftOf="@+id/btnAddItem"
android:layout_toStartOf="@+id/btnAddItem"
android:layout_alignParentBottom="true" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Item"
android:id="@+id/btnAddItem"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:onClick="onAddItem"
/>




I'm extremely new to Android and would be so happy just to get things to work, as I don't have enough background yet to have any hope at debugging.

Any guidance would be very appreciated.

UPDATE 1



app/build.gradle

Original Format

android {
compileSdkVersion 24
buildToolsVersion "24.0.0"

defaultConfig {
applicationId "com.codepath.simpletodo"
minSdkVersion 14
targetSdkVersion 24
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:24.0.0'
}


I've tried various combinations of including
'org.apache.commons:commons-io:1.3.2'
.


  1. Replacing
    'com.android.support:appcompat-v7:24.0.0'
    with
    'org.apache.commons:commons-io:1.3.2'

  2. Putting both on same line:
    compile 'com.android.support:appcompat-v7:24.0.0', 'org.apache.commons:commons-io:1.3.2'
    .

  3. Putting both on separate lines:
    compile 'com.android.support:appcompat-v7:24.0.0' compile 'org.apache.commons:commons-io:1.3.2'
    .



But when attempting the
Gradle project sync
, there is a failure with below message.

Error:(24, 13) Failed to resolve: compile org.apache.commons:commons-io:1.3.2


UPDATE 2



The final working version needed to look like this.

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:24.0.0'
compile group: 'org.apache.commons', name: 'commons-io', version: '1.3.2'
}

Answer

compile 'org.apache.commons:commons-io:1.3.2' contains FileUtils class. You should add this to your dependencies.

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