Android开发-DesignDemo-AndroidStudio(十二)TextInputLayout

项目压缩包下载地址：http://download.csdn.net/detail/iwanghang/9675030

TextInputActivity.java:

package com.iwanghang.coordinatordemo;

import android.support.design.widget.TextInputLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;

public class TextInputActivity extends AppCompatActivity implements TextWatcher {
    TextInputLayout text_input;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_text_input);
        text_input = (TextInputLayout) findViewById(R.id.text_input);
        // 监听editText的内容改变
        // 实现 addTextChangedListener 的 beforeTextChanged onTextChanged
        // afterTextChanged 这3个方法
        text_input.getEditText().addTextChangedListener(this);
    }

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void afterTextChanged(Editable editable) {
        if (editable.length()<6) {
            text_input.setError("用户名必须为6位或以上");
            text_input.setErrorEnabled(true);
        } else {
            text_input.setErrorEnabled(false);
        }
    }
}

activity_input_text.xml:

<?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:id="@+id/activity_text_input"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.iwanghang.coordinatordemo.TextInputActivity">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="用户名"/>
    <android.support.design.widget.TextInputLayout
        android:id="@+id/text_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="用户名"/>
    </android.support.design.widget.TextInputLayout>

</LinearLayout>

项目压缩包下载地址：http://download.csdn.net/detail/iwanghang/9675030