This is a small class for Android to be called by javascript safety under Android 4.2!
See the example Activity to know how to use it.
also put a this:
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package android.webkit;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Retention(RetentionPolicy.RUNTIME)
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@Target({ElementType.METHOD})
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public @interface JavascriptInterface {}