TextInputLayout 和 TextInputEditText 是属于 design 包里面的控件
呐，就是这个：compile 'com.android.support:design:26.0.0-alpha1'
这两者要结合使用，其实只用 TextInputLayout ，然后 TextInputEditText 用 EditText 替换好像也可以。
下面来看一个示例代码咯
布局文件如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.TextInputLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/userNameLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.TextInputEditText
android:id="@+id/userName"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/passwdLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.TextInputEditText
android:id="@+id/passwd"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.TextInputLayout>
</LinearLayout>
Activity的代码如下
private TextInputLayout userNameLayout;
private TextInputEditText userName;
private TextInputLayout passwdLayout;
private TextInputEditText passwd;
userNameLayout = (TextInputLayout) findViewById(R.id.userNameLayout);
userName = (TextInputEditText) findViewById(R.id.userName);
userNameLayout.setHint("请输入账号");
userName.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
if (s.length() < 3) {
userNameLayout.setErrorEnabled(true);
userNameLayout.setError("用户名不能小于3位");
} else {
userNameLayout.setErrorEnabled(false);
}
}
});
passwdLayout = (TextInputLayout) findViewById(R.id.passwdLayout);
passwdLayout.setHint("请输入密码");
passwd = (TextInputEditText) findViewById(R.id.passwd);
passwd.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
if (s.length() < 3) {
passwdLayout.setErrorEnabled(true);
passwdLayout.setError("密密不222能小于3位");
} else {
passwdLayout.setErrorEnabled(false);
}
}
});
}
其实也没什么，
主要的代码也就几行
userNameLayout.setHint("请输入账号");
这行代码，就是设置提示信息
passwdLayout.setErrorEnabled(true);
这行表示，启用错误提示，相应的，传入false就表示关闭错误提示。
passwdLayout.setError("密密不222能小于3位");
这个表示，具体的错误提示
