TextInputLayout的使用

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![这里写代码片](http://img.blog.csdn.net/20170721152758132?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQveGlhb3NoaXRvdW5hbg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)布局中：<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.hello.lianxiday_072102.MainActivity">    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_weight="0.5"        >        <TextView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:gravity="center"            android:text="Welcome"            android:textColor="#333333"            android:textSize="30sp" />    </RelativeLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_weight="0.5"        android:orientation="vertical">        <android.support.design.widget.TextInputLayout            android:id="@+id/usernameWrapper"            android:layout_width="match_parent"            android:layout_height="wrap_content">            <EditText                android:id="@+id/username"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:hint="Username"                android:inputType="textEmailAddress" />        </android.support.design.widget.TextInputLayout>        <android.support.design.widget.TextInputLayout            android:id="@+id/passwordWrapper"            android:layout_width="match_parent"            android:layout_height="wrap_content"            app:hintTextAppearance="@style/errorAppearance"            app:errorTextAppearance="@style/hintAppearance"            android:layout_marginTop="4dp">            <EditText                android:id="@+id/password"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:hint="shuakjkd是李凯的"                android:inputType="textPassword" />        </android.support.design.widget.TextInputLayout>        <Button            android:id="@+id/btn"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_marginTop="4dp"            android:text="Login" />    </LinearLayout></LinearLayout>Style中： <style name="hintAppearance" parent="TextAppearance.AppCompat">        <item name="android:textSize">14sp</item>        <item name="android:textColor">#ffee00</item>    </style>    <style name="errorAppearance" parent="TextAppearance.AppCompat">        <item name="android:textSize">14sp</item>        <item name="android:textColor">#cc0</item>    </style>activity中：public class MainActivity extends AppCompatActivity implements View.OnClickListener{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        findViewById(R.id.btn).setOnClickListener(this);    }    @Override    public void onClick(View v) {        TextInputLayout usernameWrapper = (TextInputLayout) findViewById(R.id.usernameWrapper);        TextInputLayout passwordWrapper = (TextInputLayout) findViewById(R.id.passwordWrapper);        String username = usernameWrapper.getEditText().getText().toString();        String password = passwordWrapper.getEditText().getText().toString();        if (!TextUtils.isEmpty(username)) {            usernameWrapper.setError("Not a valid email address!");        } else {            usernameWrapper.setErrorEnabled(false);        }        if (!TextUtils.isEmpty(password) ) {            passwordWrapper.setError("Not a valid password!");        } else {            passwordWrapper.setErrorEnabled(false);        }    }}
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