Question

我尝试创建一个自定义的LinearLayout，它就像一个网格。我成功了，并且有了我想要的方面，但我仍然有问题。当我只有一行时。我想将自定义布局的layout_height属性从 wrap_content 更改为 march_parent ，以便能够将要创建的唯一LinearLayout居中。

所以现在我的代码是在 onFinishInflate 方法之后执行但我在这里遇到问题，我无法获得LayoutParams，因为值为null，当我尝试设置自己的新params，它不起作用：

setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));

这是我的代码：

import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;

import java.util.ArrayList;

public class GameGridLayout extends LinearLayout {
    private Context context;
    private int currentRow = -1, maxRowItems = 3;
    private ArrayList<LinearLayout> layouts = new ArrayList<>();

    public GameGridLayout(Context context) {
        super(context);
        this.context = context;
    }

    public GameGridLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
    }

    public GameGridLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.context = context;
    }

    private ArrayList<View> getViews() {
        int nbChilds = getChildCount();
        ArrayList<View> views = new ArrayList<>();
        for (int i = 0; i < nbChilds; i++) {
            views.add(getChildAt(i));
        }
        return views;
    }

    private void reorganizeViews(Context context) {
        ArrayList<View> views = getViews();
        if(views.size() == 4) maxRowItems = 2;

        for (int i = 0; i < views.size(); i++) {
            if(i % maxRowItems == 0) {
                LinearLayout currentLayout = new LinearLayout(context);
                layouts.add(currentLayout);
                currentRow++;
            }
            View currentChild = views.get(i);
            if(currentChild != null) {
                removeView(currentChild);
                layouts.get(currentRow).addView(currentChild);
            }
        }

        for (int i = 0; i < layouts.size(); i++) {
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
            layouts.get(i).setLayoutParams(params);
            layouts.get(i).setOrientation(HORIZONTAL);
            layouts.get(i).setWeightSum(3);
            layouts.get(i).setGravity(Gravity.CENTER);

            addView(layouts.get(i));
        }

        setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        reorganizeViews(context);
    }
}

如果你知道该怎么做，我看到如果我使用inflate方法，我可能会得到我想要的结果，但我不知道该怎么做，例如：

inflate(context, ??, this);

我没有任何xml来膨胀，所以......

Answer 1

在setLayoutParams中呼叫onFinishInflate实际上无法正常工作，因为LayoutParams的{{1}}将在以后添加到其父级时被覆盖。< / p>

我建议您在GameGridLayout添加到其父级后调用setLayoutParams。

Android自定义LinearLayout：getParams返回null

1 个答案: