java - 折叠和展开动画后布局高度未正确更新

Question

早上好。

我正在尝试创建一个动态布局，您可以在其中添加和删除标签。布局还必须是可折叠和可展开的。

现在一切正常，布局高度通过添加和删除标签正确更新，但在我执行折叠和展开后功能停止。我不确定这是什么原因。如果有人能为我指出正确的方向，我将非常高兴!

代码:

public class FilterActivity extends AppCompatActivity {

    Logger logger = Logger.getLogger();

    LinearLayout tagsContainerLayout;

    Switch tagSwitch;

    // tag button
    ImageButton addTagButton;
    Button goButton;

    // heights for expanding
    Map<Integer, Integer> originalHeights;

    // tags
    ArrayList<String> selectedTags;

    // tag text bar
    AutoCompleteTextView tagsBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_filter);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        originalHeights = new HashMap<>();
        selectedTags = new ArrayList<>();

        // tag bar
        tagsBar = (AutoCompleteTextView) findViewById(R.id.tagSearch);

        // add tag
        addTagButton = (ImageButton) findViewById(R.id.addBtn);
        addTagButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String tag = tagsBar.getText().toString();

                if (!selectedTags.contains(tag)){
                    addTagToLayout(tag);
                }
            }
        });

        // start search
        goButton = (Button) findViewById(R.id.startSearchBtn);

        // switches
        tagSwitch = (Switch) findViewById(R.id.tagSwitch);

        tagSwitch.setChecked(true);

        tagLayout = (RelativeLayout) findViewById(R.id.tagsLayout);
        tagsContainerLayout = (LinearLayout) findViewById(R.id.tagContainer);

        // layouts
        addChecked(tagSwitch, tagLayout);
    }



    private void addTagToLayout(final String tagText)
    {
        // create tag
        final TextView newTag = new TextView(this);
        newTag.setText(tagText);

        newTag.setTextSize(getResources().getDimension(R.dimen.textsize));

        Drawable img = this.getResources().getDrawable(R.drawable.delete_tag_icon);
        newTag.setCompoundDrawablesWithIntrinsicBounds(img, null, null, null);
        logger.d(tagText);

        newTag.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));

        tagsContainerLayout.addView(newTag);

        logger.e("tag container height = " + tagsContainerLayout.getHeight());
        logger.e("tag top layout height = " + tagLayout.getHeight());

        ViewGroup.LayoutParams params = tagLayout.getLayoutParams();
        //params.height = newTag.getHeight() + tagLayout.getHeight();
        logger.e("new attempted height = " + String.valueOf(params.height + newTag.getHeight()));

        logger.e("params height = " + params.height);
        logger.e("newTag height = " + newTag.getHeight());

        //tagLayout.setLayoutParams(params);

        selectedTags.add(tagText);


        newTag.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                tagsContainerLayout.removeView(newTag);
                tagsContainerLayout.invalidate();
                //tagsLayout.re
                selectedTags.remove(tagText);

            }
        });

        tagLayout.requestLayout();
        tagsContainerLayout.requestLayout();
    }

    public void addChecked(final Switch s, final View target)
    {
        s.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    expand(target);
                } else {
                    collapse(target);
                }
            }
        });
    }

    private void expand(View summary) {
        //set Visible
        summary.setVisibility(View.VISIBLE);

        //final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        final int height = originalHeights.get(summary.getId());

        //summary.measure(widthSpec, height);

        ValueAnimator mAnimator = slideAnimator(0, 400, summary);

        mAnimator.start();
    }

    private void saveOriginalHeight(int id, int height)
    {
        originalHeights.put(id, height);
    }

    private void collapse(final View summary) {
        int finalHeight = summary.getHeight();

        saveOriginalHeight(summary.getId(), finalHeight);

        ValueAnimator mAnimator = slideAnimator(finalHeight, 0, summary);

        mAnimator.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationEnd(Animator animator) {
                //Height=0, but it set visibility to GONE
                summary.setVisibility(View.GONE);
            }

            @Override
            public void onAnimationStart(Animator animator) {
            }

            @Override
            public void onAnimationCancel(Animator animator) {
            }

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


    private ValueAnimator slideAnimator(int start, int end, final View summary) {

        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 layoutParams = summary.getLayoutParams();
                layoutParams.height = value;
                summary.setLayoutParams(layoutParams);
            }
        });
        return animator;
    }
}

如您所见，我一直在尝试手动执行此操作，但它不起作用，因为 newTag.getHeight() 出于某种原因不断返回 0。

Answer 1

这可能是因为您试图在渲染之前获取它的高度，请尝试使用 measure , 然后 getMeasuredHeight而不是在新创建的标签上使用 getHeight。