这个控件的两个优点：
- 更加友好地显示提示
- 更友好地显示错误信息
更加友好地显示提示：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.lovely_solory.super_william.mynotebook.MainActivity">
<android.support.design.widget.TextInputLayout
android:id="@+id/username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="username"
android:maxLength="25"
android:maxLines="1" />
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout
android:id="@+id/password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/username">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:hint="password"
android:maxLength="25"
android:maxLines="1" />
</android.support.design.widget.TextInputLayout>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/password"
android:layout_marginTop="20dp"
android:text="login" />
</RelativeLayout>
更加友好地显示错误信息：
这部分需要代码来控制：
public class MainActivity extends AppCompatActivity {
TextInputLayout edit_username, edit_password;
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edit_username = findViewById(R.id.username);
edit_password = findViewById(R.id.password);
btn = findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String username = edit_username.getEditText().getText().toString();
String password = edit_password.getEditText().getText().toString();
if (username.isEmpty()) {
edit_username.setErrorEnabled(true);
edit_username.setError("请输入正确的用户名格式");
}
if (password.isEmpty()) {
edit_password.setErrorEnabled(true);
edit_password.setError("请输入正确的密码格式");
}
if (!username.isEmpty()&&!password.isEmpty())
{
Toast.makeText(MainActivity.this,"登录成功",Toast.LENGTH_SHORT).show();
}
}
});
}
}
效果：
