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@@ -20,6 +20,8 @@ import androidx.core.view.ViewCompat;
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import androidx.core.view.WindowInsetsCompat;
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import androidx.core.view.WindowInsetsCompat;
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import java.io.Serializable;
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import java.io.Serializable;
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+import java.util.concurrent.ConcurrentHashMap;
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+import java.util.concurrent.ConcurrentMap;
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public class MainActivity extends AppCompatActivity {
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public class MainActivity extends AppCompatActivity {
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private static final String TAG = "MainActivity";
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private static final String TAG = "MainActivity";
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