TextInputLayout的使用

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因为是design包下的，所以需要导包。

TextInputLayout是LinearLayout下的一个子类。public class TextInputLayout extends LinearLayout

布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.heima.textinputlayouttest.MainActivity">    <android.support.design.widget.TextInputLayout        android:layout_width="match_parent"        android:layout_height="wrap_content">        <EditText            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:hint="账号" />    </android.support.design.widget.TextInputLayout>    <android.support.design.widget.TextInputLayout        android:id="@+id/input"        android:layout_width="match_parent"        android:layout_height="wrap_content">        <EditText            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:hint="密码" />    </android.support.design.widget.TextInputLayout></LinearLayout>

代码：

import android.support.design.widget.TextInputLayout;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.util.Log;import android.widget.EditText;public class MainActivity extends AppCompatActivity {    TextInputLayout input;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        input = (TextInputLayout) findViewById(R.id.input);        EditText editText = input.getEditText();        editText.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) {                Log.e("itcast","afterTextChanged");                if (s.length()>=10){                    input.setErrorEnabled(true);                    input.setError("字数不得超过10个");                }else {                    input.setErrorEnabled(false);                }            }        });    }}

展示：

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