Android开编程方式创建视图的宽度 [英] Android get programmatically created view's width

问题描述

我有TextView的编程方式创建，这样的：

I have TextView created programmatically, like that:

                TextView mTextView = new TextView(getApplicationContext());

                final LayoutParams params = new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                ((MarginLayoutParams) params).setMargins(8, 8, 0, 0);

                mTextView.setText(mText);
                mTextView.setLayoutParams(params);
                mTextView.setPadding(2, 2, 2, 2);
                mTextView.setBackground(getResources().getDrawable(R.drawable.note_corps));

                tagMap.addView(mTextView);

                textViewsWidth = mTextView.getWidth();

但mTextView.getWidth（）总是返回0

But mTextView.getWidth() always returns 0

如果我尝试：

mTextView.getLayoutParams().width

它返回的LayoutParams中的LayoutParams类对应的值（-1或-2）

It returns the LayoutParams corresponding value in the LayoutParams class (-1 or -2)

我怎样才能得到视图的宽度？

How can I get the view's width ?

修改我需要在这里做到这一点：

EDIT I need to do this here:

            @Override
        public void onPostExecute(Hashtable<String, Integer> hash){
            final ScrollView tagMapScroll = (ScrollView) findViewById(R.id.tagMapScroll);
            final LinearLayout tagMap = (LinearLayout) findViewById(R.id.tagMap);
            final ArrayList<Integer> arr = new ArrayList<Integer>(hash.values());
            final Enumeration<String> e = hash.keys();
            int index = 0;
            int textViewsWidth = 0;

            while(e.hasMoreElements()){
                final TextView tV = new TextView(getApplicationContext());

                tV.setTextColor(Color.parseColor("#666666"));
                tV.setText(Html.fromHtml(randomColor() + e.nextElement()));
                tV.setTextSize(arr.get(index));

                final LayoutParams params = new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                ((MarginLayoutParams) params).setMargins(8, 8, 0, 0);

                tV.setLayoutParams(params);
                tV.setPadding(2, 2, 2, 2);
                tV.setBackground(getResources().getDrawable(R.drawable.note_corps));

                tagMap.addView(tV);

                textViewsWidth += tV.getWidth();

                index++;
            }

            tagMapScroll.setVisibility(ScrollView.VISIBLE);

        }

修改SOLUTION 我用这个来自@ androiduser的回答是：

EDIT SOLUTION I used this from @androiduser's answer:

mTextView.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
                int width = mTextView.getMeasuredWidth();
                int height = mTextView.getMeasuredHeight();

问题解决了！

Problem solved !

推荐答案

我用这个解决方案：

yourView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

    @Override
    public void onGlobalLayout() {
        // Ensure you call it only once :
        yourView.getViewTreeObserver().removeGlobalOnLayoutListener(this);

        // Here you can get the size :)
    }
});

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