React Native:调整自定义UI组件的大小

Question

我已经构建了一个非常简单的原生Android UI组件,我想在单击来自我的本机项目的按钮时更新其子视图的大小.更确切地说,当单击此按钮时,我向我发送命令SimpleViewManager,然后调用resizeLayout()我的自定义视图.

我可以验证是否resizeLayout()已正确调用,但在旋转手机之前不会调整布局大小.显然,更改设备的方向会触发draw()我的自定义视图,但invalidate()我明确调用的也是如此.

其他布局更改,如更改背景颜色而不是调整大小工作正常.

我的自定义组件如下所示:

public class CustomComponent extends RelativeLayout {
    public CustomComponent(Context context) {
        super(context);
        init();
    }

    public CustomComponent(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CustomComponent(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        inflate(getContext(), R.layout.simple_layout, this);
    }

    public void resizeLayout(){
        LinearLayout childLayout = (LinearLayout) findViewById(R.id.child_layout);
        RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) childLayout.getLayoutParams();
        layoutParams.height = 50;
        layoutParams.width= 50;
        childLayout.setLayoutParams(layoutParams);

        invalidate();
    }
}

而simple_layout.xml看起来像这样:

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

    <LinearLayout
        android:id="@+id/child_layout"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:background="#ffee11"/>
</RelativeLayout>

任何帮助将不胜感激.

Answer 1

经过几天的搜索,我终于找到了这个旧的报道问题的回答本地的回购.

此解决方案与ReactPicker.java和ReactToolbar.java中使用的解决方案相同.我必须在我的CustomComponent中放入以下代码,之后甚至不需要调用requestLayout()或invalidate().一旦我更新布局的LayoutParams,就会传播更改.

@Override
public void requestLayout() {
    super.requestLayout();

    // The spinner relies on a measure + layout pass happening after it calls requestLayout().
    // Without this, the widget never actually changes the selection and doesn't call the
    // appropriate listeners. Since we override onLayout in our ViewGroups, a layout pass never
    // happens after a call to requestLayout, so we simulate one here.
    post(measureAndLayout);
}

private final Runnable measureAndLayout = new Runnable() {
    @Override
    public void run() {
        measure(MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.EXACTLY),
                MeasureSpec.makeMeasureSpec(getHeight(), MeasureSpec.EXACTLY));
        layout(getLeft(), getTop(), getRight(), getBottom());
    }
};