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Custom Options menu in android

Custom options menu in android

Custom_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:gravity="bottom">

    <ImageButton
        android:id="@+id/sendBtn"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:src="@drawable/icon"
            android:contentDescription="@string/image_des" />
     
    <ImageButton
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:src="@drawable/icon"
        android:contentDescription="@string/image_des"/>
        
    <ImageButton
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:src="@drawable/icon"
        android:contentDescription="@string/image_des" />
        
    <ImageButton
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:src="@drawable/icon"
        android:contentDescription="@string/image_des" />
 
</LinearLayout>
Main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
    <Button
    android:text="Button"
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    </Button>
   
</LinearLayout>

CustomOptionsActivity.xml

package com.example;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;

public class CustomOptionsActivity extends Activity {
      MenuDialog customMenuDialog;

      @Override
      public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

      }
      private class MenuDialog extends AlertDialog {
            public MenuDialog(Context context) {
                  super(context);

                  View cus_menu = getLayoutInflater().inflate(R.layout.custom_menu, null);
                  setView(cus_menu);
            }

            @Override
            public boolean onKeyUp(int keyCode, KeyEvent event) {
                  if (keyCode == KeyEvent.KEYCODE_MENU) {
                        dismiss();
                        return true;
                  }
                  return super.onKeyUp(keyCode, event);
            }
      }

      @Override
      public boolean onKeyUp(int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_MENU) {
                  if (customMenuDialog == null) {
                        customMenuDialog = new MenuDialog(this);
                  }
                  customMenuDialog.show();
                  return true;
            }
            return super.onKeyUp(keyCode, event);

      }

}
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