为了实现像qq或者微信输入框的效果,当在
EditText输入字符串时发送按钮显示,当输入框字符消除掉时按钮改变。所以这时候我就要用到addTextChangedListener 用它来监听用户输入状态。可以在监听中改变用户输入的内容或者提示用户输入内容不合法等等
![](//img-blog.csdn.net/20160118152204958?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center)
![](//img-blog.csdn.net/20160118152137098?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center)
- EditText editText = (EditText)findViewById(R.id.monitor_edit_text0);
- editText.addTextChangedListener(new TextWatcher() {
-
- @Override
- public void onTextChanged(CharSequence text, int start, int before, int count) {
-
-
-
-
- textView1.setText("输入后字符串 [ " + text.toString() + " ] 起始光标 [ " + start + " ] 输入数量 [ " + count+" ]");
-
- }
-
- @Override
- public void beforeTextChanged(CharSequence text, int start, int count,int after) {
-
-
-
-
- System.out.println(text.toString());
- textView0.setText("输入前字符串 [ " + text.toString() + " ]起始光标 [ " + start + " ]结束偏移量 [" + after + " ]");
- }
-
- @Override
- public void afterTextChanged(Editable edit) {
-
- textView2.setText("输入结束后的内容为 [" + edit.toString()+" ] 即将显示在屏幕上");
- }
- });
posted @
2017-05-11 09:23
brave-sailor
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