Question

我不想使用普通或迷你尺寸的FAB。所以，我试图通过使用LayoutParams来设置FAB的宽度和高度，但setLayoutParams不起作用。我尝试使用ImageButton，因为FAB扩展了ImageButton并且它适用于ImageButton。有人能告诉我为什么会这样吗？

final GridLayout.LayoutParams lp = (GridLayout.LayoutParams) mFab1.getLayoutParams();
    ViewTreeObserver vto = mFab2.getViewTreeObserver();
    ViewTreeObserver.OnGlobalLayoutListener listener = new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            lp.height = mFab2.getHeight();//Height is ready
            lp.width = mFab2.getWidth(); //Width is ready
            Log.d(LOG_TAG, (String.valueOf(mFab2.getWidth())) + " and " + (String.valueOf(mFab2.getHeight())));


        }
    } ;
    vto.addOnGlobalLayoutListener(listener);

    mFab1.setLayoutParams(lp);// Works here if mFab1 is ImageButton

    mFab1.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {

            Log.d(LOG_TAG, "Outside "+(String.valueOf(mFab1.getWidth())) + " and " + (String.valueOf(mFab1.getHeight())));
            if(mFab1.getWidth()==0){
                mFab1.setLayoutParams(lp);//trying to set LayoutParams again
                Log.d(LOG_TAG, "Inside "+(String.valueOf(mFab1.getWidth())) + " and " + (String.valueOf(mFab1.getHeight())));
            }

        }
    });

我使用v7 GridLayout并且在xml中mFab1的高度和宽度都设置为零，因为我使用权重。由于列跨度为2，layout_gravity设置为＆＃34; center_horizontal＆＃34;因此，将宽度设置为零将不起作用，这就是为什么我想在java代码中设置宽度，它对ImageButton非常有效。

    <android.support.v7.widget.GridLayout 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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:columnCount="2"
    app:rowCount="6"
    tools:context=".fragment.MainNavigationActivityFragment"
    >


<ImageButton
        android:id="@+id/mFab2"
        app:layout_rowWeight="1"
        app:layout_gravity="fill_horizontal"
        app:layout_columnSpan="1"
        app:layout_columnWeight="1"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:src="@drawable/ic_home"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:background="@drawable/home_bg"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="10dp"/>

<ImageButton
    app:layout_rowWeight="1"
    android:id="@+id/mFab3"
    app:layout_columnSpan="1"
    app:layout_gravity="fill_horizontal"
    app:layout_columnWeight="1"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:src="@drawable/ic_home"
    android:background="@drawable/home_bg"
    android:layout_marginTop="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp" />

<Button
    app:layout_rowSpan="1"
    app:layout_rowWeight="0.2"
    app:layout_gravity="fill_horizontal"
    app:layout_columnSpan="1"
    app:layout_columnWeight="1"
    android:id="@+id/button1"
    android:text="Some Text"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:background="@color/transparent"
    android:textColor="@color/colorPrimary"
    android:fontFamily="roboto-condensed"
    android:layout_marginTop="10dp"
    android:layout_marginLeft="10dp" />
<Button
    app:layout_rowSpan="1"
    app:layout_rowWeight="0.2"
    app:layout_gravity="fill_horizontal"
    app:layout_columnSpan="1"
    app:layout_columnWeight="1"
    android:id="@+id/button2"
    android:text="Some Text"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:fontFamily="roboto-condensed"
    android:textColor="@color/colorPrimary"
    android:background="@color/transparent"
    android:layout_marginTop="10dp"
    android:layout_marginLeft="10dp" />



<ImageButton
    app:layout_rowWeight="1"
    android:id="@+id/mFab3"
    android:textColor="#FFFFFF"
    android:textSize="30sp"
    app:layout_columnSpan="1"
    app:layout_gravity="fill_horizontal"
    app:layout_columnWeight="1"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:src="@drawable/ic_home"
    android:background="@drawable/home_bg"
    android:padding="10dp"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="10dp" />

<ImageButton
    app:layout_rowWeight="1"
    android:id="@+id/mFab4"
    app:layout_columnSpan="1"
    app:layout_gravity="fill_horizontal"
    app:layout_columnWeight="1"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:src="@drawable/ic_home"
    android:background="@drawable/home_bg"
    android:layout_marginTop="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp" />

<Button
    app:layout_rowSpan="1"
    app:layout_rowWeight="0.2"
    app:layout_gravity="fill_horizontal"
    app:layout_columnSpan="1"
    app:layout_columnWeight="1"
    android:id="@+id/button3"
    android:text="Some Text"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:background="@color/transparent"
    android:textColor="@color/colorPrimary"
    android:fontFamily="roboto-condensed"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="10dp" />
<Button
    app:layout_rowSpan="1"
    app:layout_rowWeight="0.2"
    app:layout_gravity="fill_horizontal"
    app:layout_columnSpan="1"
    app:layout_columnWeight="1"
    android:id="@+id/button4"
    android:text="Some Text"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:fontFamily="roboto-condensed"
    android:textColor="@color/colorPrimary"
    android:background="@color/transparent"
    android:layout_marginTop="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginLeft="10dp" />

 <android.support.design.widget.FloatingActionButton
        app:layout_rowSpan="1"
        app:layout_rowWeight="1"
        android:id="@+id/mFab1"
        app:layout_columnSpan="2"
        app:layout_gravity="center_horizontal"
        app:layout_columnWeight="1"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        app:backgroundTint="@color/colorPrimary"
        android:src="@drawable/icon"
        android:layout_margin="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
         />

<Button
    app:layout_rowSpan="1"
    app:layout_rowWeight="0.2"
    app:layout_gravity="center_horizontal"
    app:layout_columnSpan="2"
    app:layout_columnWeight="1"
    android:id="@+id/button5"
    android:text="Some Text"
    android:layout_width="wrap_content"
    android:layout_height="0dp"
    android:fontFamily="roboto-condensed"
    android:textColor="@color/colorPrimary"
    android:background="@color/transparent"
    android:layout_margin="10dp"
    android:layout_marginTop="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginBottom="10dp" />
</android.support.v7.widget.GridLayout>

Answer 1

我想我能理解你想做什么。

您似乎想根据mFab2的高度/宽度设置mFab1高度/宽度。是吗？

我认为你只需要为mFab2添加一个监听器。因此，当读取mFab2的高度/宽度时，将它们应用于mFab1。您不需要为mFab1设置监听器。

请你试试下面的代码：

    findViewById(R.id.mFab2).getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            View mFab1 = findViewById(R.id.mFab1);
            View mFab2 = findViewById(R.id.mFab2);
            mFab1.getLayoutParams().height = mFab2.getHeight();
            mFab1.getLayoutParams().width = mFab2.getWidth();
            Log.d(LOG_TAG, (String.valueOf(mFab2.getWidth())) + " and " + (String.valueOf(mFab2.getHeight())));
        }
    });

您可以使用此代码替换您在说明中共享的所有代码。然后，让我知道是否有效。

当然，如果该代码有效，您可以添加适当的空检查和任何其他错误检查

无法通过setLayoutParams

1 个答案: