Question

创建RecyclerView后，我注意到我的CardView展开时未调整为正确的高度（项目A ，项目B 和项目C ）。它的高度应与txtSubtitle TextView的高度相同。我认为txtSubtitleHeight可能是罪魁祸首，但是没有人知道是什么导致了这个问题以及如何解决这个问题？

public class MyFragmentRV extends android.support.v4.app.Fragment {

    public int mGridViewHeight;
//    public int txtSubtitleHeight;
    private static final int ITEM_TYPE = 100;
    private static final int HEADER_TYPE = 101;
    private static final int HEADER_TYPE_2 = 102;
    private static final int GRID_TYPE = 103;
//    GridView mGridViewA;
    ValueAnimator mAnimatorGV, mAnimatorTV;
    TextView txtArrowGV, txtTitle;

    //
    static final String[] frenchVowels = new String[]{
            "a", "e", "i", "o", "u", "y"
    };

    public MyFragmentRV.MyAdapter adapterGV;

    public MyFragmentRV() {}

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        return inflater.inflate(R.layout.fragment_rv, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        View v = getView();
        assert v != null;

        recyclerView = v.findViewById(R.id.my_recyclerview);

        // set the linear layout manager
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));

        // SpannableStrings
        // dynamically change SpannableString colour using defined attribute
        int[] attrS = {R.attr.spannablestringtextColor};
        TypedArray ta = getActivity().getTheme().obtainStyledAttributes(attrS);
        int colorSS = ta.getColor(0, Color.BLACK); //Color.BLACK - default value (colour will change automatically depending on chosen theme)
        Log.d(TAG, "clickMethod 1) " + Integer.toHexString(colorSS));
        ta.recycle();


        // SpannableString (start)
        SpannableStringBuilder ssb = new SpannableStringBuilder();

        SpannableString str1 = new SpannableString(" Item A ");
        str1.setSpan(new BackgroundColorSpan(Color.BLACK), 0, str1.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        str1.setSpan(new ForegroundColorSpan(ContextCompat.getColor(getContext(), R.color.yellow)), 0, str1.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        ssb.append(str1);

        SpannableString str2 = new SpannableString(" Hello World");
        str2.setSpan(new ForegroundColorSpan(colorSS), 0, str2.length(), 0);
        ssb.append(str2);
        // SpannableString (end)

        // init data
        data = new ArrayList<>();
        data.add(ssb);
        data.add("Item B");
        data.add("Item C");

        subdata = new ArrayList<>();
        subdata.add("\u2022 a");
        subdata.add("\u2022 b\n\u2022 bb");
        subdata.add("\u2022 c\n\u2022 cc\n\u2022 ccc");

        adapter = createAdapter();

        recyclerView.setAdapter(adapter);

        super.onActivityCreated(savedInstanceState);
    }

    RecyclerView recyclerView;
    ArrayList<CharSequence> data;
    ArrayList<String> subdata;
    RecyclerView.Adapter<ViewHolder> adapter;


    // creates the adapter
    private RecyclerView.Adapter<ViewHolder> createAdapter() {
        return new RecyclerView.Adapter<ViewHolder>() {
            @NonNull
            @Override
            public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int type) {
                switch (type) {
                    case HEADER_TYPE:
                        return new ViewHolder(inflateHelper(R.layout.header, parent));

                    case HEADER_TYPE_2:
                        return new ViewHolder(inflateHelper(R.layout.header, parent));

                    case ITEM_TYPE:
                        return new ViewHolder(inflateHelper(R.layout.recyclerview_item_tv, parent));

                    case GRID_TYPE:
                        return new ViewHolder(inflateHelper(R.layout.recyclerview_item_gv, parent));

                    default:
                        return new ViewHolder(inflateHelper(R.layout.recyclerview_item_tv, parent));
                }
            }

            @Override
            public void onBindViewHolder(@NonNull ViewHolder viewHolder, int position) {
                final Typeface iconFont = FontManager.getTypeface(getContext(), FontManager.FONTAWESOME); // FontManager class must be accessed first before text views can be set as image views

                switch (getItemViewType(position)) {
                    case HEADER_TYPE:
                        Button expandButton = viewHolder.itemView.findViewById(R.id.button);
                        expandButton.setText("Expand all");

                        expandButton.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                            }
                        });
                    break;
                    case HEADER_TYPE_2:
                        Button collapseButton = viewHolder.itemView.findViewById(R.id.button);
                        collapseButton.setText("Collapse all");

                        collapseButton.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                            }
                        });
                    break;
                    case ITEM_TYPE:
                        // get the current item
                        CharSequence itemA = data.get(position - 3);
                        String itemB = subdata.get(position - 3);


                        txtTitle = viewHolder.itemView.findViewById(R.id.tv_tv_A);
                        txtTitle.setText(itemA);

                        final TextView txtSubtitle = viewHolder.itemView.findViewById(R.id.tv_tv_B);
                        txtSubtitle.setText(itemB);
                        txtSubtitle.setVisibility(View.GONE);

                        //Add onPreDrawListener
                        txtSubtitle.getViewTreeObserver().addOnPreDrawListener(
                        new ViewTreeObserver.OnPreDrawListener() {

                            @Override
                            public boolean onPreDraw() {
                                txtSubtitle.getViewTreeObserver().removeOnPreDrawListener(this);
                                txtSubtitle.setVisibility(View.GONE);

                                final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
                                final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
                                txtSubtitle.measure(widthSpec, heightSpec);

                                txtSubtitleHeight = txtSubtitle.getMeasuredHeight();

                                return true;
                            }
                        });

                        final TextView txtArrowTV = viewHolder.itemView.findViewById(R.id.tv_tv_expandcollapse);
                        txtArrowTV.setText(R.string.fa_icon_chevron_down);
                        txtArrowTV.setTypeface(iconFont);

                        //
                        CardView cardView = viewHolder.itemView.findViewById(R.id.cv_tv);
                        LinearLayout mLinearLayoutTV = viewHolder.itemView.findViewById(R.id.cardview_tv_titlerow);

                        cardView.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
//                                Toast.makeText(getActivity(),"CardView clicked", Toast.LENGTH_SHORT).show();
                                if(txtSubtitle.getVisibility() == View.GONE){
                                    expandTV(txtSubtitle, txtArrowTV);
                                } else {
                                    collapseTV(txtSubtitle, txtArrowTV);
                                }
                            }
                        });

                        mLinearLayoutTV.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                if(txtSubtitle.getVisibility() == View.GONE){
                                    expandTV(txtSubtitle, txtArrowTV);
                                } else {
                                    collapseTV(txtSubtitle, txtArrowTV);
                                }
                            }
                        });

                        txtArrowTV.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                if(txtSubtitle.getVisibility() == View.GONE){
                                    expandTV(txtSubtitle, txtArrowTV);
                                } else {
                                    collapseTV(txtSubtitle, txtArrowTV);
                                }
                            }
                        });
                    break;
                    case GRID_TYPE:
                        TextView titleG = viewHolder.itemView.findViewById(R.id.tv_gv_A);

                        titleG.setText("French vowels");

                        final TextView txtArrowGV = viewHolder.itemView.findViewById(R.id.tv_gv_expandcollapse);
                        txtArrowGV.setText(R.string.fa_icon_chevron_down);
                        txtArrowGV.setTypeface(iconFont);

                        final GridView mGridViewA = viewHolder.itemView.findViewById(R.id.gv);
                        mGridViewA.setVisibility(View.GONE);
                        mGridViewA.setEnabled(false);
                        mGridViewA.setVerticalScrollBarEnabled(false);
                        adapterGV = new MyFragmentRV.MyAdapter(getActivity().getApplicationContext(), 0);
                        mGridViewA.setAdapter(adapterGV);
                        for (String frenchVowel : frenchVowels) {
                            adapterGV.addAdapterItem(new MyFragmentRV.AdapterItem(frenchVowel));
                        }


                        //Add onPreDrawListener
                        mGridViewA.getViewTreeObserver().addOnPreDrawListener(
                        new ViewTreeObserver.OnPreDrawListener() {

                            @Override
                            public boolean onPreDraw() {
                                mGridViewA.getViewTreeObserver().removeOnPreDrawListener(this);
                                mGridViewA.setVisibility(View.GONE);

                                final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
                                final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
                                mGridViewA.measure(widthSpec, heightSpec);

                                mGridViewHeight = mGridViewA.getMeasuredHeight();

                                return true;
                            }
                        });


                        CardView cardViewG = viewHolder.itemView.findViewById(R.id.cv_gv);
                        LinearLayout mLinearLayoutGV = viewHolder.itemView.findViewById(R.id.cardview_gv_titlerow);

                        cardViewG.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                if(mGridViewA.getVisibility() == View.GONE){
                                    expandGV(mGridViewA);
                                } else {
                                    collapseGV(mGridViewA);
                                }
                            }
                        });

                        mLinearLayoutGV.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                if(mGridViewA.getVisibility() == View.GONE){
                                    expandGV(mGridViewA);
                                } else {
                                    collapseGV(mGridViewA);
                                }
                            }
                        });

                        txtArrowGV.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                if(mGridViewA.getVisibility() == View.GONE){
                                    expandGV(mGridViewA);
                                } else {
                                    collapseGV(mGridViewA);
                                }
                            }
                        });
                    break;
                }
            }

            @Override
            public int getItemCount() {
                return data.size() + 3;
            }

            @Override
            public int getItemViewType(int position) {
                switch (position) {
                    case 0:
                        return HEADER_TYPE;
                    case 1:
                        return HEADER_TYPE_2;
                    case 2:
                        return GRID_TYPE;
                    default: return ITEM_TYPE;
                }
            }
        };
    }

    private View inflateHelper(int resId, ViewGroup parent) {
        return LayoutInflater.from(getActivity()).inflate(resId, parent, false);
    }

    // inner class for viewholder to use,
    class ViewHolder extends RecyclerView.ViewHolder {
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
        }
    }

    public void expandGV(final GridView mGridViewA) {
        mGridViewA.setVisibility(View.VISIBLE);
        txtArrowGV.setText(R.string.fa_icon_chevron_up);

       ValueAnimator mAnimatorGV = slideAnimator(0, mGridViewHeight, mGridViewA);
        mAnimatorGV.start();
    }
    public void collapseGV(final GridView mGridViewA) {
        txtArrowGV.setText(R.string.fa_icon_chevron_down);

        int finalGVHeight = mGridViewA.getHeight();

        mAnimatorGV = slideAnimator(finalGVHeight, 0, mGridViewA);

        mAnimatorGV.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationEnd(Animator animator) {
                mGridViewA.setVisibility(View.GONE);
            }

            @Override
            public void onAnimationStart(Animator animator) {
            }

            @Override
            public void onAnimationCancel(Animator animator) {
            }

            @Override
            public void onAnimationRepeat(Animator animator) {
            }
        });
        mAnimatorGV.start();
    }
    public void expandTV(final TextView txtSubtitle, final TextView txtArrowTV) {
        txtSubtitle.setVisibility(View.VISIBLE);

        txtArrowTV.setText(R.string.fa_icon_chevron_up);

        mAnimatorTV = slideAnimator(0, txtSubtitleHeight, txtSubtitle);

        mAnimatorTV.start();
    }

    public void collapseTV(final TextView txtSubtitle, final TextView txtArrowTV) {
        txtArrowTV.setText(R.string.fa_icon_chevron_down);

        int finalTVHeight = txtSubtitle.getHeight();

        mAnimatorTV = slideAnimator(finalTVHeight, 0, txtSubtitle);

        mAnimatorTV.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationEnd(Animator animator) {
                txtSubtitle.setVisibility(View.GONE);
            }

            @Override
            public void onAnimationStart(Animator animator) {
            }

            @Override
            public void onAnimationCancel(Animator animator) {
            }

            @Override
            public void onAnimationRepeat(Animator animator) {
            }
        });
        mAnimatorTV.start();
    }


    public ValueAnimator slideAnimator(int start, int end, final View txtSubtitle) {

        final ValueAnimator animator = ValueAnimator.ofInt(start, end);

        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                // update height
                int value = (Integer) valueAnimator.getAnimatedValue();

                ViewGroup.LayoutParams layoutParamsTV = txtSubtitle.getLayoutParams();
                layoutParamsTV.height = value;
                txtSubtitle.setLayoutParams(layoutParamsTV);

//                ViewGroup.LayoutParams layoutParamsGV = mGridViewA.getLayoutParams();
//                layoutParamsGV.height = value;
//                mGridViewA.setLayoutParams(layoutParamsGV);
            }
        });
        return animator;
    }
}

XML

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:focusable="true"
    android:id="@+id/cv_tv"
    android:layout_marginBottom="20dp"
    >

    <LinearLayout
        android:id="@+id/cardview_main"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="10dp"
        android:animateLayoutChanges="true">

        <LinearLayout
            android:id="@+id/cardview_tv_titlerow"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_marginBottom="2dp"
            android:weightSum="100">

            <TextView
                android:id="@+id/tv_tv_A"
                android:layout_weight="90"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:textColor="?android:attr/textColorPrimary"
                style="@android:style/TextAppearance.Medium" />

            <TextView
                android:id="@+id/tv_tv_expandcollapse"
                android:clickable="true"
                android:focusable="true"
                android:layout_weight="10"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="10dp"
                android:textColor="?android:attr/textColorPrimary"
                style="@android:style/TextAppearance.Large" />
        </LinearLayout>

        <RelativeLayout
            android:id="@+id/relativelayout_tv"
            android:animateLayoutChanges="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/tv_tv_B"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textColor="?android:attr/textColorPrimary"
                style="@android:style/TextAppearance.Large" />
        </RelativeLayout>
    </LinearLayout>
</android.support.v7.widget.CardView>

Macmist的建议

Answer 1

好吧，看来这是您获得不正确高度的功能。实际上，通过重新阅读您的代码，我想我可能已经对发生的事情有所了解。通过测试，我们确定问题出在检索大小的函数方面。现在，在演示gif上，所有展开的视图都具有相同的大小，而对于最后一张卡片，它似乎具有所需的大小，该文本后面没有空格。

因此，根据这些信息，我的猜测如下：

您确定高度的功能确实有效
但是只有一个变量定义了该大小（txtSubtitleHeight）
因此，对于每张卡，都会计算其高度，然后用该卡的高度替换txtSubtitleHeight
最后，txtSubtitleHeight具有最后看到的卡片的高度。而且，当您使用此变量扩展每张卡时，每张卡的高度都将与最后一张卡的高度成正比。

因此，基于此，如果我没记错的话，一个简单的解决方法是为每个卡设置一个高度变量，从而为适配器中的每个视口持有者设置一个高度变量。

您可以这样做：

   // inner class for viewholder to use,
    class ViewHolder extends RecyclerView.ViewHolder {
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
        }
        int height;
    }

然后您可以像这样更新onPreDraw函数：

@Override
public boolean onPreDraw() {
    txtSubtitle.getViewTreeObserver().removeOnPreDrawListener(this);
                                txtSubtitle.setVisibility(View.GONE);
    final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
    final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
                                txtSubtitle.measure(widthSpec, heightSpec);
    viewHolder.height = txtSubtitle.getMeasuredHeight();
    return true;
}

最后在您的expandTV中

public void expandTV(final TextView txtSubtitle, final TextView txtArrowTV, final ViewHolder holder) {
    txtSubtitle.setVisibility(View.VISIBLE);

    txtArrowTV.setText(R.string.fa_icon_chevron_up);

    mAnimatorTV = slideAnimator(0, holder.height, txtSubtitle);

    mAnimatorTV.start();
}

我相信它应该可以解决您的问题：）

展开后，RecyclerView内部的CardView不能调整为正确的高度

1 个答案: