Android 的选项菜单OptionsMenu和上下文菜单ContextMenu的使用案例

1、选项菜单OptionsMenu和上下文菜单ContextMenu 效果如下：

 2、MainActivity 

package com.example.aidldemo;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
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 Main3Activity extends AppCompatActivity {

    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);

        tv = findViewById(R.id.textView2);
        registerForContextMenu(tv);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.action_bar_menu,menu);
        return super.onCreateOptionsMenu(menu);

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch(item.getItemId()){
            case R.id.search:
                Toast.makeText(this,"search",Toast.LENGTH_SHORT).show();
                break;
            case R.id.msg:
//                Toast.makeText(this,"msg",Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(this,MainActivity.class);
                startActivity(intent);
                break;
            case R.id.setting:
                Toast.makeText(this,"设置",Toast.LENGTH_SHORT).show();
                break;
            case R.id.about :
                Toast.makeText(this,"关于",Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.context_menu, menu);
        super.onCreateContextMenu(menu, v, menuInfo);
    }




    @Override
    public boolean onContextItemSelected(MenuItem item) {
        switch(item.getItemId()){

            case R.id.copy:
                Toast.makeText(this,"copy",Toast.LENGTH_SHORT).show();
                break;
            case R.id.collect :
                Toast.makeText(this,"collect",Toast.LENGTH_SHORT).show();
                break;
            case R.id.report :
                Toast.makeText(this,"report",Toast.LENGTH_SHORT).show();
                break;
        }
        return super.onContextItemSelected(item);
    }


}

3、在res目录下的menu目录下创建action_bar_menu.xml选项菜单和context_menu.xml上下文菜单：

 选项菜单 action_bar_menu.xml 文件

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/search"
        android:icon="@android:drawable/ic_menu_search"
        android:title="搜索"
        app:actionViewClass="android.support.v7.widget.SearchView"
        app:showAsAction="always" />
    <item
        android:id="@+id/msg"
        android:actionLayout="@layout/fragment_list"
        android:icon="@android:drawable/ic_menu_sort_by_size"
        android:title="搜索"
        app:showAsAction="always" />
    <item
        android:id="@+id/setting"
        android:icon="@drawable/ic_looks_one"
        android:title="设置" />
    <item
        android:id="@+id/about"
        android:icon="@drawable/ic_looks_two"
        android:title="关于" />
</menu>

上下文菜单 context_menu.xml 文件

<?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
        android:id="@+id/collect"
        android:title="收藏" />
    <item
        android:id="@+id/report"
        android:title="举报" />
</menu>

3、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=".Main3Activity">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Context Menu"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

4、清单文件 AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.aidldemo">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".Main3Activity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
       
        <activity android:name=".MainActivity">
            <meta-data android:name="android.support.PARENT_ACTIVITY"
                        android:value=".Main3Activity"></meta-data>

     
        </activity>
    </application>

</manifest>