Android EditText一部分特殊功能

Android EditText部分特殊功能

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1、给EditText加上文字选中功能，比如微博的插入话题功能。点击“插入话题”按钮的时候，“#请插入话题名称#”在两个#号中间的内容处于选中状态，用户一点击即消失。代码如下：

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1. text.setText("#请插入话题名称#");??????
2. Editable editable = text.getText();??????
3. Selection.setSelection(editable,?1, editable.length() -?1);??

2、如果想默认进入一个Activity时，唯一的一个edittext先不要获得焦点。在EditText前面加上一个没有大小的Layout：

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1. <LinearLayout??????
2. ????android:focusable="true"?android:focusableInTouchMode="true"??????
3. ????android:layout_width="0px"?android:layout_height="0px"/>??

3、输入文字的时候，如果想限制字数，并提示用户，可用以下方法：

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1. text.addTextChangedListener(new?TextWatcher() {??????
2. ??????????????????
3. ????????????@Override??????
4. ????????????public?void?onTextChanged(CharSequence s,?int?start,?int?before,?int?count) {??????
5. ???????????????? textCount = textCount + count - before;??????
6. ?????????????????if?(textCount <=?140) {??????
7. ?????????????????????? writeWordDes.setText("可输入字数："?+ (140?- textCount));??????
8. ?????????????????????? writeWordDes.setTextColor(getResources().getColor(R.color.solid_black));??????
9. ???????????????? }?else?{??????
10. ???????????????????? writeWordDes.setText("超出字数："?+ (textCount -?140));??????
11. ???????????????????? writeWordDes.setTextColor(getResources().getColor(R.color.solid_red));??????
12. ???????????????? }??????
13. ????????????}??????
14. ??????????????????
15. ????????????@Override??????
16. ????????????public?void?beforeTextChanged(CharSequence s,?int?start,?int?count,??????
17. ????????????????????int?after) {??????
18. ??????????????????????
19. ????????????}??????
20. ??????????????????
21. ????????????@Override??????
22. ????????????public?void?afterTextChanged(Editable s) {??????
23. ??????????????????????
24. ????????????}??????
25. ????????});??????
26. ????}??

4、让EditText不可输入，比如超过一定字数后，不让用户再输入文字：

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1. text.setFilters(new?InputFilter[] {????????
2. ?????????new?InputFilter() {????????
3. ????????????????public?CharSequence filter(CharSequence source,?int?start,????????
4. ????????????????????????int?end, Spanned dest,?int?dstart,?int?dend) {????????
5. ????????????????????return?source.length() <?1?? dest.subSequence(dstart, dend) :?"";????????
6. ????????????????}????????
7. ????????????}????????
8. ????????}); ? ?