如何使按钮消失，在滚动的列表视图的末尾？

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我想使用FAB作为项目的列表视图添加项目。虽然我想为滚动发布/隐藏设置动画。我折腾这样的：如何使按钮消失，在滚动的列表视图的末尾？

MainActivity.java类：

public class MainActivity extends Activity { 
private ListView listView; 

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

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent intent = new Intent(getApplicationContext(),AddActivity.class); 
      startActivity(intent); 
     } 
    }); 
    listView = (ListView) findViewById(R.id.ListView); 

.. 
}

}

activity_main.xml中：

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    tools:context="vow_note.maxsoft.com.vownote.MainActivity"> 
<include layout="@layout/content_main" /> 

<android.support.design.widget.FloatingActionButton 
    android:id="@+id/fab" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_gravity="bottom|end" 
    android:layout_margin="@dimen/fab_margin" 
    android:src="@android:drawable/ic_menu_add" />

content_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:orientation="vertical" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
> 

<LinearLayout android:layout_width="match_parent" 
    android:layout_height="70dp" 
    android:orientation="horizontal" 
    android:gravity="center_vertical|center" 
    android:padding="3dp" 
    android:background="#000000" 
    android:id="@+id/ll"> 
    ... 
</LinearLayout> 

<ListView android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:id="@+id/ListView" 
    android:layout_gravity="right" 
    android:background="#000000" 
    android:paddingBottom="50dp" 
    > 
</ListView>

，并在最后，FABHideScroll.java：

public class FABHideScroll extends FloatingActionButton.Behavior { 
public FABHideScroll(Context context, AttributeSet attrs) { 
    super(); 
} 

@Override 
public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) { 
    super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed); 

    //child -> Floating Action Button 
    if (child.getVisibility() == View.VISIBLE && dyConsumed > 0) { 
     child.hide(); 
    } else if (child.getVisibility() == View.GONE && dyConsumed < 0) { 
     child.show(); 
    } 
} 

@Override 
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View directTargetChild, View target, int nestedScrollAxes) { 
    return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL; 
}

}

我知道应该有他们的问题，因为它不运行。

我该如何解决它？非常感谢！

来源

2016-03-02 Mina Dahesh