Android学习第六天---menu

主xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world" />

</RelativeLayout>

在menu中添加xml文件为

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/menu_settings1"
        android:title="@string/menu_settings1"/>
    
    <item android:id="@+id/menu_settings2" android:title="@string/menu_settings2">
        <menu>
            <item android:id="@+id/submenu1" android:title="submenu1"></item>
            <item android:id="@+id/submenu2" android:title="submenu2"></item>
        </menu>    
    </item>    
    <item
        android:id="@+id/menu_settings3"
        android:title="@string/menu_settings3"/>
    <item
        android:id="@+id/menu_settings4"
        android:title="@string/menu_settings4"/>
    

</menu>

java代码中

package cn.core.test;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {
        case R.id.menu_settings1:
            Log.i("TAR", "settings1");
            break;
        case R.id.menu_settings2:
            Log.i("TAR", "settings2");
            break;
        case R.id.menu_settings3:
            Log.i("TAR", "settings3");
            break;
        case R.id.menu_settings4:
            Log.i("TAR", "settings4");
            break;
        case R.id.submenu1:
            Log.i("TAR", "submenu1");
            break;
        case R.id.submenu2:
            Log.i("TAR", "submenu2");
            break;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}