Android基础——选项菜单,上下文菜单

大鹏一日同风起,扶摇直上九万里。这篇文章主要讲述Android基础——选项菜单,上下文菜单相关的知识,希望能为你提供帮助。
【Android基础——选项菜单,上下文菜单】首先要在资源目录下新建menu目录,所有的菜单布局文件都在这个目录下
选项菜单和上下文菜单的资源文件

< ?xml version="1.0" encoding="utf-8"?> < menu xmlns:android="http://schemas.android.com/apk/res/android"> < item android:id="@+id/message" android:title="消息"> < /item> < item android:id="@+id/homepage" android:title="首页"> < /item> < item android:id="@+id/help" android:title="帮追"> < /item> < item android:id="@+id/feedback" android:title="我要反馈"> < /item> < item android:id="@+id/setting" android:title="设置"> < /item> < item android:id="@+id/regard" android:title="关于"> < /item> < /menu>

< ?xml version="1.0" encoding="utf-8"?> < menu xmlns:android="http://schemas.android.com/apk/res/android"> < item android:id="@+id/copy" android:title="复制"> < /item> < item android:id="@+id/save" android:title="保存"> < /item> < /menu>

java代码
package com.example.mymenui; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.view.ContextMenu; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private TextView textView = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); /* * 2:上下文菜单 * */ //2.1:配置上下文菜单xml文件//2.2:为文本框注册上下文菜单 textView = (TextView)findViewById(R.id.text1); registerForContextMenu(textView); } //2.3:重写onCreateContextMenu()方法,添加一个上下文菜单 @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { MenuInflater menuInflater = new MenuInflater(this); menuInflater.inflate(R.menu.contextmenu,menu); } //2.4:指定各个菜单项被选择时做出的处理 @Override public boolean onContextItemSelected(@NonNull MenuItem item) { switch (item.getItemId()) { case R.id.copy: Toast.makeText( MainActivity.this,"已复制",Toast.LENGTH_SHORT ).show(); break; case R.id.save: Toast.makeText( MainActivity.this,"已保存",Toast.LENGTH_SHORT ).show(); break; } return super.onContextItemSelected(item); }/* * 1:使用选项菜单的 *1.1:配置菜单的xml文件 * */ //1.2:重写onCreateOptionsMenu() 方法,添加一个选项菜单 @Override public boolean onCreateOptionsMenu(Menu menu) { //实例化MenuInflater对象 MenuInflater menuInflater = new MenuInflater(this); //解析菜单资源文件 menuInflater.inflate(R.menu.menu,menu); //返回这个菜单 return super.onCreateOptionsMenu(menu); } //1.3:onOptionsItemSelected()对各个菜单项进行处理 @Override public boolean onOptionsItemSelected(@NonNull MenuItem item) { switch (item.getItemId()){ case R.id.setting: Intent intent1 = new Intent( MainActivity.this,Setting.class ); startActivity(intent1); break; case R.id.regard: Intent intent2 = new Intent( MainActivity.this,Regard.class ); startActivity(intent2); break; } return super.onOptionsItemSelected(item); }}

 

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