android中判断控件是否为空的地方非常之多，比如登录注册，只要是需要填写东西的地方基本上都需要判空。

难度不大，但是代码相对冗杂，如果集成框架的话就相对简单多了。

1.添加依赖

compile 'com.mobsandgeeks:android-saripaar:2.0.3'

2.布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp">

    <EditText
        android:id="@+id/et1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入姓名" />

        ......

    <EditText
        android:id="@+id/et6"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入姓名" />

    <Button
        android:text="Button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/button" />

</LinearLayout>

3.获取对象并设置相应判断类型

@BindView(R.id.button)
    Button button;

    @BindView(R.id.et1)
    @NotEmpty(messageResId = R.string.errorMessage)//类型
    @Order(1)//第几个
    EditText et1;
    @BindView(R.id.et2)
    @NotEmpty(messageResId = R.string.errorMessage)
    @Order(2)
    EditText et2;

strings.xml

<resources>
    <string name="app_name">ValidationDemo</string>
    <string name="errorMessage">不能为空</string>
</resources>

4.onCreate中初始化

validator = new Validator(this);
validator.setValidationListener(this);

两个监听方法

@Override
    public void onValidationSucceeded() {//不为空的时候执行
        //do somethings
        //sendSubmit();
    }

    @Override
    public void onValidationFailed(List<ValidationError> errors) {//为空的时候执行
        for (ValidationError error : errors) {
            View view = error.getView();
            String message = error.getCollatedErrorMessage(this);
            if (view instanceof EditText) {
                ((EditText) view).setError(message);
            }
        }
    }

5.调用

@Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.button:
                validator.validate();
                break;
        }
    }

6.扩展（非空、邮箱等）

NotEmpty
@NotEmpty(messageId = R.string.validation_name, order = 1)
private EditText mNameEditText;

MaxLength
MinLength

@MinLength(value = 1, messageId = R.string.validation_participants, order = 2)
private EditText mNameEditText;

MaxValue
MinValue

@MinValue(value = 2L, messageId = R.string.validation_name_length)
private EditText mEditNumberOfParticipants;

MaxNumberValue
MinNumberValue

@MinNumberValue(value = "5.5", messageId = R.string.validation_name_length)
private EditText mEditPotentialOfHydrogen;

RegExp

@RegExp(value = EMAIL, messageId = R.string.validation_valid_email)
private EditText mEditEmail;
@RegExp(value = "^[0-9]+$", messageId = R.string.validation_valid_count)
private EditText mEditCount;

DateInFuture

@DateInFuture(messageId = R.string.validation_date)
private TextView mTxtDate;

DateNoWeekend

@DateNoWeekend(messageId = R.string.validation_date_weekend)
private TextView mTxtDate;

Custom

@Custom(value = MyVeryOwnValidator.class, messageId = R.string.validation_custom)
private EditText mNameEditText;

Demo地址：​​https://github.com/yechaoa/ValidationDemo​​

github：​​https://github.com/ragunathjawahar/android-saripaar/​​