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我试图ConstraintLayout在 Android 中理解,但不幸的是它的行为与 Swift 中的有很大不同ConstraintLayout。这真的让我很困惑。

长话短说:更改下面的评论行似乎没有任何区别。即使 LayoutParams 未设置为,约束似乎总是覆盖视图大小MATCH_CONSTRAINT

        LayoutParams params = new LayoutParams(
                LayoutParams.MATCH_PARENT,
                HEIGHT
        );

        mView = new ConstraintLayout(getContext());
        mView.setId(View.generateViewId());
        mView.setLayoutParams(params);
        addView(mView);

        ConstraintLayout.LayoutParams cParams;
        cParams = new ConstraintLayout.LayoutParams(
//                ConstraintLayout.LayoutParams.WRAP_CONTENT,
//                ConstraintLayout.LayoutParams.WRAP_CONTENT
//                ConstraintLayout.LayoutParams.MATCH_PARENT,
//                ConstraintLayout.LayoutParams.MATCH_PARENT
                HEIGHT - 2*PADDING,
                HEIGHT - 2*PADDING
        );

        mText = new TextView(getContext());
        mText.setId(View.generateViewId());
        mText.setText("Title");
        mText.setTextSize(30);
        mText.setGravity(Gravity.CENTER);
//        mText.setLayoutParams(cParams);
        mText.setTextColor(Color.RED);
        mText.setBackgroundColor(Color.YELLOW);
        mView.addView(mText);

        set = new ConstraintSet();

        set.connect(mText.getId(), ConstraintSet.START, ConstraintSet.PARENT_ID, ConstraintSet.START, PADDING);
        set.connect(mText.getId(), ConstraintSet.TOP, ConstraintSet.PARENT_ID, ConstraintSet.TOP, PADDING);
        set.connect(mText.getId(), ConstraintSet.END, ConstraintSet.PARENT_ID, ConstraintSet.END, PADDING); //Always needed
        set.connect(mText.getId(), ConstraintSet.BOTTOM, ConstraintSet.PARENT_ID, ConstraintSet.BOTTOM, PADDING); //Always needed

        set.applyTo(mView);

LayoutParams使用约束布局时需要设置吗?如果是这样,为什么?

是否可以使用 LayoutParams 手动设置我的视图大小并只使用ConstrainSet.connect两次,例如 withSTARTTOP?我试过了,但没有用。

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0 回答 0