Use this library
Opened this issue · 7 comments
Hi,
I'm a beginner in java and I would like to use this library but I don't understand how to use it. The example is half explained, for example I don't understand what are the parent and child layouts.
If you have just a working example it would help me a lot!
Thanks
Hello @polo2169,
First welcome to java and TreeView😄
I don't understand what are the parent and child layouts.
The tree is represented as roots and subnodes for example
- directory 1
- file 1
- directory 2
- file 2
Directory 1 node is a parent and has 2 children (file 1, directory 2) and directory 2 is also a parent of one child who is file 2, so to create this in java after creating 4 nodes you need to set the relation between them, so add file 2 node as a child in directory 2, and then add file 1 and directory 2 as children in directory 2
TreeNode directory1 = new TreeNode("Directory 1", R.layout.directory);
TreeNode directory2 = new TreeNode("Directory 2", R.layout.directory);
TreeNode file1 = new TreeNode("File 1", R.layout.file);
TreeNode file2 = new TreeNode("File 2", R.layout.file);
directory2.addChild(file2);
directory1.addChild(file1);
directory1.addChild(directory2);
This is how to use TreeView basically, if you have any problem with any example we can discuss it.
Thanks
Amr Hesham
Hi @AmrDeveloper,
Thanks for your answer, unfortunately it doesn't work any better.
The editor says "add String to first parameter to the constructor".
I think I defined some things wrong but I followed the example.
It weird @polo2169,
Make sure you used this import
import com.amrdeveloper.treeview.TreeNode;
Can you please write the error message in this line
treeViewAdapter.updateTreeNodes(roots);
you are right I had the wrong import :/
I don't have any more errors! However, nothing is displayed during my test...
I don't understand what I have to put in the layout R.layout.list_item_one
I'm sorry I don't understand ahah
package fr.pdego.treeview2;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import com.amrdeveloper.treeview.TreeNode;
import com.amrdeveloper.treeview.TreeViewAdapter;
import com.amrdeveloper.treeview.TreeViewHolderFactory;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView=findViewById(R.id.recycler_view);
TreeViewHolderFactory factory = (v, layout) -> {
if (layout == R.layout.directory) return new CustomViewHolderOne(v);
else if (layout == R.layout.file) return new CustomViewHolderTwo(v);
else return new CustomViewHolderThree(v);
};
TreeViewAdapter treeViewAdapter = new TreeViewAdapter(factory);
recyclerView.setAdapter(treeViewAdapter);
TreeNode root1 = new TreeNode("Root1", R.layout.directory);
root1.addChild(new TreeNode("Child1", R.layout.file));
root1.addChild(new TreeNode("Child2", R.layout.file));
List<TreeNode> roots = new ArrayList<>();
roots.add(root1);
treeViewAdapter.updateTreeNodes(roots);
}
}
My view Holder
package fr.pdego.treeview2;
import android.view.View;
import androidx.annotation.NonNull;
import com.amrdeveloper.treeview.TreeNode;
import com.amrdeveloper.treeview.TreeViewHolder;
public class CustomViewHolderOne extends TreeViewHolder {
public CustomViewHolderOne(@NonNull View itemView) {
super(itemView);
}
@Override
public void bindTreeNode(TreeNode node) {
super.bindTreeNode(node);
// Here you can bind your node and check if it selected or not
}
}
My layouts
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="10dp"
android:paddingBottom="10dp">
<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_folder" />
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@id/image"
android:text="List Item"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Small"
android:textStyle="bold" />
</RelativeLayout>
Thank you for all your help!
First of all roots should add to the roots list so if you want to show Directories 1 and 2 add them to the list
roots.add(directory1);
roots.add(directory2);
Then in your view holder, you should update the text view to show the value for example, think of it as an adapter
package fr.pdego.treeview2;
import android.view.View;
import androidx.annotation.NonNull;
import com.amrdeveloper.treeview.TreeNode;
import com.amrdeveloper.treeview.TreeViewHolder;
public class CustomViewHolderOne extends TreeViewHolder {
private TextView text;
public CustomViewHolderOne(@NonNull View itemView) {
super(itemView);
text = itemView.findViewById(R.id.text);
}
@Override
public void bindTreeNode(TreeNode node) {
super.bindTreeNode(node);
text.setText(node.getValue().toString());
}
}
After your first example work well, I suggest to run the example app and play with it to see the features, and if you have any question please feel free to ask
I did it! Thank you so much for your help and for this really nice project!
@polo2169 You're most welcome :D, enjoy using it