global: Fix or suppress most lints/warnings

Signed-off-by: Samuel Holland <samuel@sholland.org>

app/src/main/java/com/wireguard/android/widget/KeyInputFilter.java

@@ -11,7 +11,11 @@ import com.wireguard.crypto.KeyEncoding;
  */
 
 public class KeyInputFilter implements InputFilter {
-    public static KeyInputFilter newInstance() {
+    private static boolean isAllowed(final char c) {
+        return Character.isLetterOrDigit(c) || c == '+' || c == '/';
+    }
+
+    public static InputFilter newInstance() {
         return new KeyInputFilter();
     }
 
@@ -40,8 +44,4 @@ public class KeyInputFilter implements InputFilter {
         }
         return replacement;
     }
-
-    private boolean isAllowed(final char c) {
-        return Character.isLetterOrDigit(c) || c == '+' || c == '/';
-    }
 }

app/src/main/java/com/wireguard/android/widget/NameInputFilter.java

@@ -11,7 +11,11 @@ import com.wireguard.android.model.Tunnel;
  */
 
 public class NameInputFilter implements InputFilter {
-    public static NameInputFilter newInstance() {
+    private static boolean isAllowed(final char c) {
+        return Character.isLetterOrDigit(c) || "_=+.-".indexOf(c) >= 0;
+    }
+
+    public static InputFilter newInstance() {
         return new NameInputFilter();
     }
 
@@ -39,8 +43,4 @@ public class NameInputFilter implements InputFilter {
         }
         return replacement;
     }
-
-    private boolean isAllowed(final char c) {
-        return Character.isLetterOrDigit(c) || "_=+.-".indexOf(c) >= 0;
-    }
 }

app/src/main/java/com/wireguard/android/widget/ToggleSwitch.java

@@ -25,6 +25,7 @@ public class ToggleSwitch extends Switch {
     private boolean isRestoringState;
     private OnBeforeCheckedChangeListener listener;
 
+    @SuppressWarnings({"SameParameterValue", "WeakerAccess"})
     public ToggleSwitch(final Context context, final AttributeSet attrs) {
         super(context, attrs);
     }