問(wèn)題描述

現(xiàn)在有這么一個(gè)簡(jiǎn)單的Fragment:

public class Level1Fragment extends Fragment { TextView tv; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {ViewGroup v=inflater.inflate(R.layout.activity_test,null);tv= (TextView) v.findViewById(R.id.level1_textview);tv.setText('啦啦啦');return v; } //給View截圖，代碼應(yīng)該沒有問(wèn)題 public static Bitmap convertViewToBitmap(View view){view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());view.buildDrawingCache();return view.getDrawingCache(); }

現(xiàn)在，我想在Fragment剛加載完成時(shí)，獲取這個(gè)TextView的截圖，我應(yīng)該把代碼放在哪個(gè)事件里？

我嘗試過(guò)tv.postDelayed()、tv.post()以及tv.getViewTreeObserver().addOnPreDrawListener()。

嘗試用的代碼也貼出來(lái)吧：

@Override public void onResume() {super.onResume();tv.postDelayed(new Runnable() { @Override public void run() {final Bitmap bit=convertViewToBitmap(tv);//iv只是個(gè)簡(jiǎn)單的ImageView，與本問(wèn)題無(wú)關(guān)iv.setImageBitmap(bit);iv.startAnimation(new AlphaAnimation(1,0)); }},100); }

但是都無(wú)法獲取到。

所以，請(qǐng)問(wèn)到底該用什么方法來(lái)正確獲取到tv的截圖呢？

(btw，F(xiàn)ragment是直接通過(guò)FragmentTransaction.replace()顯示的，而不是通過(guò)ViewPager，因此生命周期應(yīng)該不會(huì)被打亂..)

求解惑!

問(wèn)題解答

你說(shuō)的這三種方法前兩種都是可以的啊，最后一種有問(wèn)題，應(yīng)該是getViewTreeObserver().addOnGlobalLayoutListener()