View.java example

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/**
 * Copyright 2011-2015 John Ericksen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.androidtransfuse.annotations;

import javax.inject.Qualifier;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;

/**
 * Injection qualifier annotation specifying which view is injected by resource id or tag.
 *
 * Injecting with this qualifier will lookup in the relevant Activity or Fragment class the view element using the
 * `getViewById()` or `getViewByTag()` methods.  Additionally, as long as the
 * type is a dependent of the Android `View` class, the injected instance will be cast to the given type.
 *
 *
 * @author John Ericksen
 */
@Target({METHOD, CONSTRUCTOR, FIELD, PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface View {

    /**
     * Resource id used to lookup the View via the `Activity.getViewById()` method.
     */
    int value() default -1;

    /**
     * Resource tag used to lookup the View via the `Activity.getViewByTag()` method.
     */
    String tag() default "";
}