59、常规控件（2）TextInputLayout-让EditText提示更加人性化

提示语用在显示。

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:layout_width="match_parent"
 3     android:layout_height="match_parent"
 4     android:layout_margin="20dp"
 5     android:orientation="vertical">
 7     <android.support.design.widget.TextInputLayout
 8         android:id="@+id/textInput"
 9         android:layout_width="match_parent"
10         android:layout_height="wrap_content">
11         <EditText
12             android:layout_width="match_parent"
13             android:layout_height="wrap_content" />
14     </android.support.design.widget.TextInputLayout>
16 </LinearLayout>

TextInputLayout textInput = (TextInputLayout) this.findViewById(R.id.textInput);
textInput.setHint("请输入用户名");

 1         final TextInputLayout textInput = (TextInputLayout) this.findViewById(R.id.textInput);
 2         textInput.setHint("请输入用户名");
 3
 4         EditText editText = textInput.getEditText();
 5         editText.addTextChangedListener(new TextWatcher() {
 6             @Override
 7             public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
11             @Override
12             public void onTextChanged(CharSequence s, int start, int before, int count) {
13                 if (s.length() > 10) {
14                     textInput.setError("用户名不能超过10位");
15                     textInput.setErrorEnabled(true);
16                 } else {
17                     textInput.setErrorEnabled(false);
18                 }
19             }
21             @Override
22             public void afterTextChanged(Editable s) {}
25         });