控件 - Menu

Menu 菜单

res文件夹下，新建menu文件夹，将菜单xml放入其中。

示例代码

main.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item android:id="@+id/add_item"
        android:title="Add"
        android:icon="@drawable/add"
        app:showAsAction="always"/>
    <item android:id="@+id/remove_item"
        android:title="Remove"
        android:icon="@drawable/remove"
        app:showAsAction="never"/>
</menu>

activity_com_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

   <android.support.v7.widget.Toolbar
        android:id="@+id/mb_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

</LinearLayout>

MenuActivity.java

public class MenuActivity extends MyBaseActivity {

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

        toolBar = findViewById(R.id.mb_toolbar);
        setSupportActionBar(toolBar);
    }

    // 重写创建菜单方法 onCreateOptionsMenu
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // 加载菜单
        getMenuInflater().inflate(R.menu.main, menu);
        // return true允许显示菜单
        return true;
    }

    // 重写菜单选择方法 onOptionsItemSelected
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        super.onOptionsItemSelected(item);
        // 匹配点击哪个菜单项
        switch (item.getItemId()) {
            case R.id.add_item:
                Toast.makeText(this, "You Clicked Add", Toast.LENGTH_LONG).show();
                break;
            case R.id.remove_item:
                Toast.makeText(this, "You Clicked Remove", Toast.LENGTH_LONG).show();
                break;
            default:
        }
        return true;
    }
}