在Android Studio中实现选项菜单 [英] Implementing an option menu in Android Studio

问题描述

如何在我的android应用程序中实现选项菜单?我尝试了 Android Developer 中的代码，但出现了错误.例如:必须声明元素菜单.这是我的代码

How do I implement an option menu in my android application? I tried code from Android Developer but I get errors. Such as these: Element menu must be declared. Here is my code

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/new_game"
    android:icon="@drawable/ic_new_game"
    android:title="@string/new_game"
    android:showAsAction="ifRoom"/>
<item android:id="@+id/help"
    android:icon="@drawable/ic_help"
    android:title="@string/help" />
</menu>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.lucavanraalte.test" >

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme" >

    <activity android:name=".MainActivity" android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

    </activity>
</application>

</manifest>

推荐答案

在您的Java代码中，添加此onCreateOptionsMenu以显示optionMenu，

In your java code, add this onCreateOptionsMenu to show optionMenu,

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.option_menu, menu); //your file name
        return super.onCreateOptionsMenu(menu);
    }

保留您的res \ menu \ option_menu文件夹，

Keep your under res\menu\option_menu folder,

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/new_game"
    android:icon="@drawable/ic_new_game"
    android:title="@string/new_game"
    android:showAsAction="ifRoom"/>
<item android:id="@+id/help"
    android:icon="@drawable/ic_help"
    android:title="@string/help" />
</menu>

现在，如果您要设置onOptionsItemSelected，即您可以使用的onClick事件，

Now, if you want to set onOptionsItemSelected i.e onClick event for that ou can use,

@Override
    public boolean onOptionsItemSelected(final MenuItem item) {

        switch (item.getItemId()) {
            case android.R.id.new_game:
                //your code
                // EX : call intent if you want to swich to other activity 
                return true;
            case R.id.help:
                //your code
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

这篇关于在Android Studio中实现选项菜单的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！