android---菜单栏选项

android菜单栏选项

layout.xml

<?xml version="1.0" encoding="utf-8"?>

main.java

package com.example.optionmenu;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Switch;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {TextView txt;MenuItem item;    @Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    txt = findViewById(R.id.TextView);}public boolean onCreateOptionsMenu(Menu menu)    {        super.onCreateOptionsMenu(menu);        menu.add(                1,//组号                1,//ID                1,//排序                "菜单栏1");        menu.add(1,2,2,"菜单栏2");        menu.add(1,3,3,"菜单栏3");        menu.add(1,4,4,"菜单栏4");        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem Item)    {        String title = "选择了"+item.getTitle().toString();        switch (item.getItemId())        {            case 1:                txt.setText(title);                break;            case 2:                txt.setText(title);                break;            case 3:                txt.setText(title);                break;            case 4:                txt.setText(title);                break;            default:                return super.onOptionsItemSelected(item);        }        return true;    }

}

layout.xml

main.java

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