res下新增Menu資料夾,新增main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/add_item" android:title="Add"/>

    <item android:id="@+id/remove_item" android:title="Remove"/>
</menu>

重寫方法

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main
 
, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.add_item:
            Toast.makeText(getApplicationContext(), "You clickde Add", Toast.LENGTH_SHORT).show();
            break;
        case R.id.remove_item
 
:
            Toast.makeText(getApplicationContext(), "You clickde Remove", Toast.LENGTH_SHORT).show();
            break;
        default:
    }
    return true;
}

點選可以得到如下2個按鈕