setMargins 方法不适用于自定义 ViewGroup

Question

我正在做一个项目，我的部分工作是在主屏幕上创建一个滑动布局，当应用程序启动时，它会部分出现在底部，我们可以滚动该布局。然后我必须在其中添加子视图，这将是卡片。现在我已经创建了一个自定义 ViewGroup 并且我将以编程方式添加它们。

我已经成功完成了大部分任务。

我已经为滑动布局创建了自定义 FrameLayout。

然后我使用它并添加在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"/>

现在我创建了一个名为 MyCardView 的 java class 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;
            }
        }

    }
}

然后我尝试以编程方式将 MyCardView 的对象添加到我的自定义 FrameLayout 中。

这是 onCreate() 中执行任务的方法。也就是把两个自定义ViewGroup加成一个LinearLayout.

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);
}

现在我正在尝试设置 ViewGroup 的边距，但这似乎不适用。请帮助。

Answer 1

我犯的错误是，在我的代码中，我声明了 ViewGroup.MarginLayoutParams layoutParams1 的一个实例，并且我在 linearLayout.addView(vg1,layoutParams1) 中传递了相同的实例，但是方法 addView() 接受 View 作为第一个参数，LayoutParams 的实例作为第二个参数。

所以我认为这是问题所在（不完全确定）。所以我将代码更改为

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

setMargins 方法不适用于自定义 ViewGroup

setMargins method is not working on custom ViewGroup

java

android

android-custom-view

viewgroup