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| import java.util.*; | |
| public class Main { | |
| public static void main(String[] args) { | |
| List<String> names = null; | |
| // NPE!!! | |
| names.stream().filter(Objects::nonNull).forEach(System.out::println); | |
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| import java.util.*; | |
| import static br.com.felipebelluco.javaplayground.PredicateUtil.negate; | |
| public class Main { | |
| public static void main(String[] args) { | |
| List<String> list = Arrays.asList("foo", "", "bar"); | |
| // Instead of this... | |
| list.stream().filter(name -> !name.isEmpty()).forEach(System.out::println); |
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| // Preferences > Key Bindings > Add it to your "Keymap User" file: | |
| {"keys": ["alt+shift+f"], "command": "reindent", "args": {"single_line": false}} |
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| cd src/ && find -type f | sed -e 's/.*.//' | sort | uniq -c |
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| if (ContextCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) { | |
| // Permissão ainda não foi concedida | |
| } else { | |
| // Permissão já foi concedida, já é possível usufruir da funcionalidade | |
| } |
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| if (ContextCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) { | |
| // Permissão ainda não foi concedida | |
| } else { | |
| // Permissão já foi concedida, já é possível usufruir da funcionalidade | |
| } |
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| if (ContextCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) { | |
| // Verifica se o usuário já negou acesso a permisão | |
| if (shouldShowRequestPermissionRationale(Manifest.permission.CALL_PHONE)) { | |
| // Usuário negou acesso | |
| // Mostrar uma dialog explicando a importância do app ter acesso a funcionalidade | |
| } else { | |
| // Usuário não negou acesso ou negou e marcou a caixa de "não perguntar novamente" | |
| // Fazer a requisição da permissão | |
| } | |
| } |
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| AlertDialog.Builder(thisActivity).apply { | |
| setMessage(R.string.more_info_dialog_message) | |
| setTitle(R.string.more_info_dialog_title) | |
| setPositiveButton(R.string.yes_please) { d, i -> | |
| // Se o usuário quiser, requere novamente permissão à funcionalidade | |
| ActivityCompat.requestPermissions( | |
| thisActivity, | |
| arrayOf(Manifest.permission.CALL_PHONE), | |
| CALL_PHONE_RESULT_CODE) | |
| } |
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| override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) { | |
| when (requestCode) { | |
| CALL_PHONE_RESULT_CODE -> { | |
| // Gerenciar o resultado da requisição | |
| } | |
| } | |
| } |
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| ActivityCompat.requestPermissions( | |
| thisActivity, | |
| arrayOf(Manifest.permission.CALL_PHONE), | |
| CALL_PHONE_RESULT_CODE) |
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