如何在Android中自定义浮动操作按钮，使其在启用和禁用FAB状态时具有不同的外观和感觉？

// 布局文件：activity_main.xml
<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/fab_icon"
    app:backgroundTint="@color/fab_enabled_color"
    />

// Java代码：MainActivity.java
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.content.res.ColorStateList;

public class MainActivity extends AppCompatActivity {
    private FloatingActionButton fabButton;

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

        fabButton = findViewById(R.id.fab_button);

        // 禁用FAB
        setFabEnabled(false);
    }

    private void setFabEnabled(boolean enabled) {
        fabButton.setEnabled(enabled);
        
        if (enabled) {
            // 启用状态下的样式
            fabButton.setBackgroundTintList(
                ColorStateList.valueOf(
                    ContextCompat.getColor(this, R.color.fab_enabled_color)
                )
            );
        } else {
            // 禁用状态下的样式
            fabButton.setBackgroundTintList(
                ColorStateList.valueOf(
                    ContextCompat.getColor(this, R.color.fab_disabled_color)
                )
            );
        }
    }
}