setmargin方法在自定义ViewGroup上不起作用

Question

我正在做一个项目，我的工作部分是在主屏幕上创建一个滑动布局，当应用程序启动时，它将部分出现在底部，我们可以滚动该布局。然后我需要在里面添加子视图也就是cards。现在，我已经创建了一个自定义的ViewGroup，我将以编程方式添加它们。

我已经成功地完成了任务的大部分。

我已经创建了一个自定义的FrameLayout滑动布局。

然后我使用它并添加了XML。

<?xml version="1.0" encoding="utf-8"?>
<com.dhrumil.airhockey.OverflowView
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/layer_list"
android:padding="5dp"
android:layout_height="match_parent"/>

现在，我已经创建了一个名为MyCardView的java类，它扩展了ViewGroup。

public class MyCardView extends ViewGroup {
    public MyCardView(Context context){
        super(context);
        init(context);
    }
    public MyCardView(Context context, AttributeSet attrs){
        super(context,attrs);
        init(context);
    }
    public MyCardView(Context context, AttributeSet attrs, int defStyleAttr){
        super(context, attrs,defStyleAttr);
        init(context);
    }
    public MyCardView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        init(context);
    }
    public void init(Context context){
    }
    @Override
    protected void onLayout(boolean b, int l, int i1, int i2, int i3) {
        // TODO Auto-generated method stub
        final int count = getChildCount();
        int curWidth, curHeight, curLeft, curTop, maxHeight;
        //get the available size of child view
        int childLeft = this.getPaddingLeft();
        int childTop = this.getPaddingTop();
        int childRight = this.getMeasuredWidth() - this.getPaddingRight();
        int childBottom = this.getMeasuredHeight() - this.getPaddingBottom();
        int childWidth = childRight - childLeft;
        int childHeight = childBottom - childTop;
        maxHeight = 0;
        curLeft = childLeft;
        curTop = childTop;
        //walk through each child, and arrange it from left to right
        for (int i = 0; i < count; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                //Get the maximum size of the child
                child.measure(MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.AT_MOST),
                        MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.AT_MOST));
                curWidth = child.getMeasuredWidth();
                curHeight = child.getMeasuredHeight();
                //wrap is reach to the end
                if (curLeft + curWidth >= childRight) {
                    curLeft = childLeft;
                    curTop += maxHeight;
                    maxHeight = 0;
                }
                //do the layout
                child.layout(curLeft, curTop, curLeft + curWidth, curTop + curHeight);
                //store the max height
                if (maxHeight < curHeight)
                    maxHeight = curHeight;
                curLeft += curWidth;
            }
        }
    }
}

然后我试图以编程方式将MyCardView的对象添加到自定义FrameLayout中。

这是onCreate()内部执行任务的方法。即将两个自定义ViewGroup添加到一个LinearLayout中。

public void setupText(){
    FrameLayout frame = (FrameLayout) findViewById(R.id.overflow_frame);
    LinearLayout linearLayout = new LinearLayout(getBaseContext());
    linearLayout.setOrientation(LinearLayout.VERTICAL);
    ViewGroup vg = new MyCardView(getBaseContext());
    ViewGroup.MarginLayoutParams layoutParams = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,200);
    vg.setBackgroundColor(Color.WHITE);
    ViewCompat.setElevation(vg, 5);
    TextView tvTemp = new TextView(getBaseContext());
    tvTemp.setTextColor(Color.BLACK);
    tvTemp.setText("Hello There");
    vg.addView(tvTemp);
    ViewGroup vg1 = new MyCardView(getBaseContext());
    ViewGroup.MarginLayoutParams layoutParams1 = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,200);
    layoutParams1.setMargins(0,10,0,0);
    vg1.setBackgroundColor(Color.WHITE);
    ViewCompat.setElevation(vg1, 5);
    TextView tvTemp1 = new TextView(getBaseContext());
    tvTemp1.setTextColor(Color.BLACK);
    tvTemp1.setText("Hello There 2");
    vg1.addView(tvTemp1);
    linearLayout.addView(vg,layoutParams);
    linearLayout.addView(vg1,layoutParams1);
    frame.addView(linearLayout);
}

现在发生的是我试图设置ViewGroup的margin，但这似乎不适用。请帮助。

Answer 1

我所做的错误是，在我的代码中，我已经声明了ViewGroup.MarginLayoutParams layoutParams1的实例，我在linearLayout.addView(vg1,layoutParams1)中传递了相同的实例，但方法addView()接受View作为第一个参数，LayoutParams的实例作为第二个。

所以我认为这就是问题所在(不完全确定)。所以我把代码改成

LinearLayout.LayoutParams layoutParams1 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,200);