Android permission doesn't work even if I have declared it

javaandroidandroid-permissions
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What is the difference between == and equals() in Java?

javaequalityidentityobject-comparison
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How to evaluate a math expression given in string form?

javamathstring
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Sending Email in Android using JavaMail API without using the default/built-in app

javaemailandroidandroid-intentjakarta-mail
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What is an efficient way to implement a singleton pattern in Java? [closed]

javadesign-patternssingleton
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