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  • 菜单项onCreateOptionsMenu()和onOptionsItemSelected()的使用

    Java源文件

    package com.example.macname.myapplication;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.MenuItem;
    import android.widget.Toast;
    import android.view.Menu;
    public class MainActivity extends AppCompatActivity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
        }
        public boolean onCreateOptionsMenu(Menu menu) {
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }
        public boolean onOptionsItemSelected(MenuItem item) {
            switch (item.getItemId()) {
                case R.id.add_item:
                    Toast.makeText(this, "You clicked Add", Toast.LENGTH_SHORT).show();
                    break;
                case R.id.remove_item:
                    Toast.makeText(this, "You clicked Remove", Toast.LENGTH_SHORT).show();
                    break;
                default:
            }
            return true;
        }
    }

    res/menu/main.xml

    <menu xmlns:android="http://schemas.android.com/apk/res/android" >
        <item
            android:id="@+id/add_item"
            android:title="Add"/>
        <item
            android:id="@+id/remove_item"
            android:title="Remove"/>
    </menu>

    res/layout/activity_main.xml

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
    
    </android.support.constraint.ConstraintLayout>

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  • 原文地址:https://www.cnblogs.com/sea-stream/p/10079729.html
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