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;
