Saturday, January 30, 2016

android - Add, update and remove Menu item programmatically

MainActivity.java

package com.cfsuman.androidtutorials;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;


public class MainActivity extends AppCompatActivity {
    private TextView mTextView;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        mTextView = findViewById(R.id.textView);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu){
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.toolbar_options_menu, menu);
        return true;
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item){
        int id = item.getItemId();
        String title = item.getTitle().toString();

        if (id == R.id.delete) {
            mTextView.append("\n" + title + " Clicked.");
            return true;
        } else if (id == R.id.copy) {
            mTextView.append("\n" + title + " Clicked.");
            return true;
        } else if (id == R.id.paste) {
            mTextView.append("\n" + title + " Clicked.");
            return true;
        }else {
            return super.onOptionsItemSelected(item);
        }
    }



    @Override
    public boolean onPrepareOptionsMenu(Menu menu){
        // Add new Menu Item
        // Specify an id for the new menu item
        int purpleId = 101;

        // Check the menu item already added or not
        if(menu.findItem(purpleId) == null){
            // If it not exists then add the menu item to menu
            MenuItem cut = menu.add(
                    Menu.NONE, // groupId
                    purpleId, // itemId
                    2, // order
                    "Cut" // title
            );

            // Set an icon for the new menu item
            cut.setIcon(R.drawable.ic_action_content_cut);

            // Set the show as action flags for new menu item
            cut.setShowAsActionFlags(
                    MenuItem.SHOW_AS_ACTION_WITH_TEXT |
                            MenuItem.SHOW_AS_ACTION_ALWAYS
            );

            // Set a click listener for the new menu item
            cut.setOnMenuItemClickListener(menuItem -> {
                mTextView.append("\n" + cut.getTitle() + " Clicked.");
                return true;
            });

            mTextView.append("\nCut MenuItem Added.");
        }


        // Remove a menu item from menu
        if(menu.findItem(R.id.copy)!=null){
            // If copy menu item is not deleted then
            // delete/remove it from the menu
            menu.removeItem(R.id.copy);
            mTextView.append("\nCopy MenuItem Deleted.");
        }


        // Update/modify/change a menu item
        MenuItem paste = menu.findItem(R.id.paste);
        if(paste.getTitle() != "Paste Text"){
            // If paste menu item title not updated
            // then update/change it
            paste.setTitle("Paste Text");
            mTextView.append("\nPaste MenuItem Edited.");
        }


        super.onPrepareOptionsMenu(menu);
        return true;
    }
}
activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tool="http://schemas.android.com/tools"
    android:background="#DCDCDC"
    android:padding="24dp">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tool:text="TextView"
        android:fontFamily="sans-serif"
        android:textSize="26sp"
        android:textStyle="italic"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>
res/menu/toolbar_options_menu.xml

<?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/delete"
        android:title="Delete"
        android:icon="@drawable/ic_action_delete"
        app:showAsAction="always|withText"
        android:orderInCategory="1" />
    <item
        android:id="@+id/copy"
        android:title="Copy"
        android:icon="@drawable/ic_action_content_copy"
        app:showAsAction="ifRoom|withText"
        android:orderInCategory="2" />
    <item
        android:id="@+id/paste"
        android:title="Paste"
        android:icon="@drawable/ic_action_content_paste"
        app:showAsAction="ifRoom|withText"
        android:orderInCategory="3" />
</menu>