setMargins方法不适用于自定义ViewGroup [英] setMargins method is not working on custom ViewGroup

问题描述

我正在一个项目中，我的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将部分出现在底部，我们可以滚动该布局.然后，我必须在其中添加子视图，即卡片.现在，我已经创建了一个自定义ViewGroup，并将以编程方式添加它们.

I am working on a project where my portion of work is to create a sliding layout on main screen which will partially appear at bottom when the app will start and we can scroll that layout. And then I have to add child views inside of it which will be cards. Now for that I have created a custom ViewGroup and I will add them programmatically.

我已经成功完成了大部分任务.

I have succeed in making most of the portion of the task.

我为滑动布局创建了自定义FrameLayout.

I have created a custom FrameLayout for sliding layout.

然后我用它并添加了XML.

Then I used it and added in 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类，该类扩展了ViewGroup.

Now after that I have created a java class named MyCardView which exends 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的对象添加到我的自定义FrameLayout中.

Then I am trying to add objects of MyCardView into custom FrameLayout of mine programmatically.

这是onCreate()中执行任务的方法.将两个自定义ViewGroup添加到一个LinearLayout中.

Here is the method inside onCreate() which does the task. Which is to add two custom ViewGroups into one 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);
}

现在发生了什么事，我正在尝试设置ViewGroup的边距，但这似乎并不适用.请帮忙.

Now what happens is I am trying to set margin of ViewGroup but that doesn't seem to apply. Please Help.

推荐答案

我做的错误是，在我的代码中，我声明了ViewGroup.MarginLayoutParams layoutParams1的实例，并且在linearLayout.addView(vg1,layoutParams1)中传递了相同的实例，但是该方法addView()接受View作为第一个参数，并接受LayoutParams的实例作为第二个参数.

The mistake I was doing is, in my code I have declared an instance of ViewGroup.MarginLayoutParams layoutParams1 and I am passing the same instance in linearLayout.addView(vg1,layoutParams1) but the method addView() accepts View as first argument and an instance of LayoutParams as second.

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

So I think that was the problem (not fully sure). So I changed my code to

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

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