Android Studio-da menyu yaratish

Menyu elementlarini bosish bilan ishlash.

Agar menyu elementlaridan birini bosgan bo'lsak, unda hech narsa bo'lmaydi. Amallarni menyuga bog'lash uchun MainActivity.java faylida onOptionsItemSelected-ni bekor qilishimiz kerak.
Tanlangan menyu bandini ekranda ko'rsatish uchun activity_main.xml fayliga id = header bilan TextView-ni qo'shamiz:

android:layout_width="match_parent"
android:layout_height="match_parent">


android:id="@+id/header"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="24sp" />



a MainActivity.java faylini o'zgartiramiz:
package com.example.android.menyuilova;


import androidx.appcompat.app.AppCompatActivity;


import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return true;
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
TextView headerView = findViewById(R.id.header);
switch (id) {
case R.id.sozlamalar:
headerView.setText("Sozlamalar");
return true;
case R.id.ochish:
headerView.setText("Ochish");
return true;
case R.id.saqlash:
headerView.setText("Saqlash");
return true;
}
return super.onOptionsItemSelected(item);
}
}
Qaysi menyu tanlanganligini aniqlash uchun avval uning identifikatorini olamiz: int id = item.getItemId(). Keyin biz switch, case -dan foydalanamiz va kerakli variantni tanlaymiz va tanlovga qarab ma'lum amallarni bajaramiz - bizni kodda TextView matnini o'rnatadi.
Endi yana bir bor ilovani ishga tushirib ishlashini ko'ramiz: