TextInputLayout簡單說使用

TextInputLayout是android.support.design.widget裏的一個控件,須要配合EditText一塊兒使用才行,並且必須是包裹住EditText,例如:

<android.support.design.widget.TextInputLayout
        android:layout_height="wrap_content"
        app:hintTextAppearance="@style/hintStyle"
        android:layout_width="match_parent">

        <EditText
            android:layout_width="match_parent"
            android:layout_height="@dimen/height_150dp"
            android:layout_margin="@dimen/margin_5dp"
            android:gravity="top"
            android:hint="設置輸入內容"
            android:maxLength="120"
            android:layout_gravity="center_horizontal|top"
            android:background="@null"
            android:textColor="@color/light_grey"/>
    </android.support.design.widget.TextInputLayout>

TextInputLayout是爲了檢測輸入的合法性應運而生的新控件,咱們在平常項目中經常須要檢測用戶輸入字符是否符合要求,必須合法性檢查或者字符數目檢查,TextInputLayout能夠讓提示變得靈活和醒目.好比咱們如今就構造一個輸入合法手機號的EditText的代碼.

```
public class MainActivity extends AppCompatActivity {

@Bind(R.id.et)
EditText et;
@Bind(R.id.et_input_layout)
TextInputLayout etInputLayout;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.bind(this);

    et.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        //TextInputLayout的setError方法必須放到onTextChanged裏
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
                if (isMobileNum(s.toString())){
                    Log.e("輸入的是合法的字符串","輸入的是合法的字符串");
                    etInputLayout.setErrorEnabled(false);
                }else{
                    Toast.makeText(MainActivity.this,"輸入的不是合法的字符串,並讓字符串歸空",Toast.LENGTH_SHORT).show();
                    //啓動錯誤提示
                    etInputLayout.setErrorEnabled(true);
                    etInputLayout.setError("輸入的不是手機號");
                }
                isMobileNum(s.toString());
        }

        //當咱們有須要判斷輸入字符內容長度的要求時,放到afterTextChanged方法裏
        @Override
        public void afterTextChanged(Editable s) {
            //判斷輸入內容的長度放在此處
        }
    });
}

public static boolean isMobileNum(String mobiles)
{
    Pattern p = Pattern
            .compile("^((13[0-9])|(15[^4,//D])|(18[0,5-9]))//d{8}$");
    Matcher m = p.matcher(mobiles);
    return m.matches();
}

}