app/src/main/java/io/lbry/browser/MainActivity.java

@@ -353,7 +353,11 @@ public class MainActivity extends AppCompatActivity implements SdkStatusListener
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // workaround to fix dark theme because https://issuetracker.google.com/issues/37124582
+        try {
             new WebView(this);
+        } catch (Exception ex) {
+            // pass (don't fail initialization on some _weird_ device implementations)
+        }
         AppCompatDelegate.setDefaultNightMode(isDarkMode() ? AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO);
 
         initKeyStore();
@@ -365,17 +369,20 @@ public class MainActivity extends AppCompatActivity implements SdkStatusListener
         initSpecialRouteMap();
 
         LbryAnalytics.init(this);
+        try {
             FirebaseInstanceId.getInstance().getInstanceId().addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
                 @Override
                 public void onComplete(Task<InstanceIdResult> task) {
                     if (!task.isSuccessful()) {
                         return;
                     }
-
                     // Get new Instance ID token
                     firebaseMessagingToken = task.getResult().getToken();
                 }
             });
+        } catch (IllegalStateException ex) {
+            // pass
+        }
 
         super.onCreate(savedInstanceState);
         dbHelper = new DatabaseHelper(this);
@@ -739,8 +746,13 @@ public class MainActivity extends AppCompatActivity implements SdkStatusListener
 
     public void openPublishesOnSuccessfulPublish() {
         // close publish form
+        try {
             getSupportFragmentManager().popBackStack();
             openFragment(PublishesFragment.class, true, NavMenuItem.ID_ITEM_PUBLISHES);
+        } catch (IllegalStateException ex) {
+            // pass
+            onBackPressed();
+        }
     }
 
     public void openPublishForm(Claim claim) {
@@ -2486,8 +2498,14 @@ public class MainActivity extends AppCompatActivity implements SdkStatusListener
                 !startingSignInFlowActivity) {
             enteringPIPMode = true;
             PictureInPictureParams params = new PictureInPictureParams.Builder().build();
+
+            try {
                 enterPictureInPictureMode(params);
                 return true;
+            } catch (IllegalStateException ex) {
+                // pass
+                enteringPIPMode = false;
+            }
         }
 
         return false;
@@ -2933,6 +2951,9 @@ public class MainActivity extends AppCompatActivity implements SdkStatusListener
     }
 
     public static boolean hasPermission(String permission, Context context) {
+        if (context == null) {
+            return false;
+        }
         return (ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED);
     }
 

app/src/main/java/io/lbry/browser/VerificationActivity.java

@@ -177,7 +177,7 @@ public class VerificationActivity extends FragmentActivity implements SignInList
 
                 @Override
                 public void onError(Exception error) {
-                    showFetchUserError(error.getMessage());
+                    showFetchUserError(error != null ? error.getMessage() : getString(R.string.fetch_current_user_error));
                     hideLoading();
                 }
             });
@@ -213,7 +213,7 @@ public class VerificationActivity extends FragmentActivity implements SignInList
                 }
                 @Override
                 public void onError(Exception error) {
-                    showFetchUserError(error.getMessage());
+                    showFetchUserError(error != null ? error.getMessage() : getString(R.string.fetch_current_user_error));
                     hideLoading();
                 }
             });
@@ -250,7 +250,7 @@ public class VerificationActivity extends FragmentActivity implements SignInList
 
             @Override
             public void onError(Exception error) {
-                showFetchUserError(error.getMessage());
+                showFetchUserError(error != null ? error.getMessage() : getString(R.string.fetch_current_user_error));
                 hideLoading();
             }
         });

app/src/main/java/io/lbry/browser/dialog/RepostClaimDialogFragment.java

@@ -231,6 +231,11 @@ public class RepostClaimDialogFragment extends BottomSheetDialogFragment impleme
         }
 
         Claim channel = (Claim) channelSpinner.getSelectedItem();
+        if (channel == null) {
+            showError(getString(R.string.please_select_repost_channel));
+            return;
+        }
+
         StreamRepostTask task = new StreamRepostTask(name, bid, claim.getClaimId(), channel.getClaimId(), repostProgress, new ClaimResultHandler() {
             @Override
             public void beforeStart() {
@@ -256,11 +261,14 @@ public class RepostClaimDialogFragment extends BottomSheetDialogFragment impleme
     }
 
     private void showError(String message) {
-        Snackbar.make(getView(), message, Snackbar.LENGTH_LONG).
+        View view = getView();
+        if (view != null && !Helper.isNullOrEmpty(message)) {
+            Snackbar.make(view, message, Snackbar.LENGTH_LONG).
                     setBackgroundTint(Color.RED).
                     setTextColor(Color.WHITE).
                     show();
         }
+    }
 
     private void startLoading() {
         Dialog dialog = getDialog();

app/src/main/java/io/lbry/browser/dialog/SendTipDialogFragment.java

@@ -91,11 +91,13 @@ public class SendTipDialogFragment extends BottomSheetDialogFragment implements
 
         TextView infoText = view.findViewById(R.id.tip_info);
         infoText.setMovementMethod(LinkMovementMethod.getInstance());
+        if (claim != null) {
             infoText.setText(HtmlCompat.fromHtml(
                     Claim.TYPE_CHANNEL.equalsIgnoreCase(claim.getValueType()) ?
                             getString(R.string.send_tip_info_channel, claim.getTitleOrName()) :
                             getString(R.string.send_tip_info_content, claim.getTitleOrName()),
                     HtmlCompat.FROM_HTML_MODE_LEGACY));
+        }
 
         sendButton.setOnClickListener(new View.OnClickListener() {
             @Override

app/src/main/java/io/lbry/browser/tasks/localdata/LoadGalleryItemsTask.java

@@ -55,6 +55,7 @@ public class LoadGalleryItemsTask extends AsyncTask<Void, GalleryItem, List<Gall
                         MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
                         projection, null, null,
                         String.format("%s DESC LIMIT 150", MediaStore.MediaColumns.DATE_MODIFIED));
+                if (cursor != null) {
                     while (cursor.moveToNext()) {
                         int idColumn = cursor.getColumnIndex(MediaStore.MediaColumns._ID);
                         int nameColumn = cursor.getColumnIndex(MediaStore.MediaColumns.DISPLAY_NAME);
@@ -70,6 +71,7 @@ public class LoadGalleryItemsTask extends AsyncTask<Void, GalleryItem, List<Gall
                         item.setDuration(cursor.getLong(durationColumn));
                         items.add(item);
                     }
+                }
             } catch (SQLiteException ex) {
                 // failed to load videos. log and pass
                 Log.e(TAG, ex.getMessage(), ex);

app/src/main/java/io/lbry/browser/ui/channel/ChannelFormFragment.java

@@ -254,7 +254,13 @@ public class ChannelFormFragment extends BaseFragment implements
 
     private void checkParams() {
         Map<String, Object> params = getParams();
-        if (params.containsKey("claim")) {
+        if (params == null) {
+            Context context = getContext();
+            if (context instanceof MainActivity) {
+                ((MainActivity) context).onBackPressed();
+                return;
+            }
+        } else if (params.containsKey("claim")) {
             Claim claim = (Claim) params.get("claim");
             if (claim != null && !claim.equals(this.currentClaim)) {
                 this.currentClaim = claim;

app/src/main/java/io/lbry/browser/ui/findcontent/FileViewFragment.java

@@ -835,7 +835,10 @@ public class FileViewFragment extends BaseFragment implements
                     dialog.setListener(new RepostClaimDialogFragment.RepostClaimListener() {
                         @Override
                         public void onClaimReposted(Claim claim) {
-                            Snackbar.make(root.findViewById(R.id.file_view_claim_display_area), R.string.content_successfully_reposted, Snackbar.LENGTH_LONG).show();
+                            Context context = getContext();
+                            if (context instanceof MainActivity) {
+                                ((MainActivity) context).showMessage(R.string.content_successfully_reposted);
+                            }
                         }
                     });
                     Context context = getContext();
@@ -1416,7 +1419,7 @@ public class FileViewFragment extends BaseFragment implements
             root.findViewById(R.id.file_view_exoplayer_container).setVisibility(View.GONE);
             root.findViewById(R.id.file_view_unsupported_container).setVisibility(View.VISIBLE);
             String fileNameString = "";
-            if (claim.getFile() != null) {
+            if (claim.getFile() != null && !Helper.isNullOrEmpty(claim.getFile().getDownloadPath())) {
                 LbryFile lbryFile = claim.getFile();
                 File file = new File(lbryFile.getDownloadPath());
                 fileNameString = String.format("\"%s\" ", file.getName());

app/src/main/java/io/lbry/browser/ui/publish/PublishFormFragment.java

@@ -585,6 +585,7 @@ public class PublishFormFragment extends BaseFragment implements
     private void updateFieldsFromCurrentClaim() {
         if (currentClaim != null && !editFieldsLoaded) {
             Context context = getContext();
+            try {
                 Claim.StreamMetadata metadata = (Claim.StreamMetadata) currentClaim.getValue();
                 uploadedThumbnailUrl = currentClaim.getThumbnailUrl();
                 if (context != null && !Helper.isNullOrEmpty(uploadedThumbnailUrl)) {
@@ -637,6 +638,10 @@ public class PublishFormFragment extends BaseFragment implements
                 inputAddress.setEnabled(false);
                 editMode = true;
                 editFieldsLoaded = true;
+            } catch (ClassCastException ex) {
+                // invalid claim value type
+                cancelOnFatalCondition(getString(R.string.publish_invalid_claim_type));
+            }
         }
     }
 
@@ -1297,8 +1302,11 @@ public class PublishFormFragment extends BaseFragment implements
     @Override
     public void onFilePicked(String filePath) {
         if (Helper.isNullOrEmpty(filePath)) {
-            Snackbar.make(getView(), R.string.undetermined_image_filepath, Snackbar.LENGTH_LONG).setBackgroundTint(
+            View view = getView();
-                    ContextCompat.getColor(getContext(), R.color.red)).show();
+            if (view != null) {
+                Snackbar.make(view, R.string.undetermined_image_filepath, Snackbar.LENGTH_LONG).
+                        setBackgroundTint(Color.RED).setTextColor(Color.WHITE).show();
+            }
             return;
         }
 

app/src/main/java/io/lbry/browser/ui/verification/EmailVerificationFragment.java

@@ -70,8 +70,12 @@ public class EmailVerificationFragment extends Fragment {
         inputEmail.setOnFocusChangeListener(new View.OnFocusChangeListener() {
             @Override
             public void onFocusChange(View view, boolean hasFocus) {
+                try {
                     String layoutHint = !hasFocus ? "" : getString(R.string.email);
                     inputLayoutEmail.setHint(layoutHint);
+                } catch (IllegalStateException ex) {
+                    // pass
+                }
             }
         });
         buttonContinue.setOnClickListener(new View.OnClickListener() {
@@ -98,9 +102,12 @@ public class EmailVerificationFragment extends Fragment {
 
     private void addEmail() {
         currentEmail = Helper.getValue(inputEmail.getText());
-        if (Helper.isNullOrEmpty(currentEmail) || currentEmail.indexOf("@") == -1) {
+        if (Helper.isNullOrEmpty(currentEmail) || !currentEmail.contains("@")) {
-            Snackbar.make(getView(), R.string.provide_valid_email, Snackbar.LENGTH_LONG).
+            View view = getView();
+            if (view != null) {
+                Snackbar.make(view, R.string.provide_valid_email, Snackbar.LENGTH_LONG).
                         setBackgroundTint(Color.RED).setTextColor(Color.WHITE).show();
+            }
             return;
         }
 
@@ -136,8 +143,11 @@ public class EmailVerificationFragment extends Fragment {
 
             @Override
             public void onError(Exception error) {
+                View view = getView();
+                if (view != null && error != null) {
                     Snackbar.make(getView(), error.getMessage(), Snackbar.LENGTH_LONG).
                             setBackgroundTint(Color.RED).setTextColor(Color.WHITE).show();
+                };
                 Helper.setViewVisibility(buttonContinue, View.VISIBLE);
             }
         });
@@ -194,14 +204,20 @@ public class EmailVerificationFragment extends Fragment {
 
             @Override
             public void onSuccess() {
-                Snackbar.make(getView(), R.string.please_follow_instructions, Snackbar.LENGTH_LONG).show();
+                View view = getView();
+                if (view != null) {
+                    Snackbar.make(view, R.string.please_follow_instructions, Snackbar.LENGTH_LONG).show();
+                }
                 Helper.setViewEnabled(buttonResend, true);
             }
 
             @Override
             public void onError(Exception error) {
-                Snackbar.make(getView(), error.getMessage(), Snackbar.LENGTH_LONG).
+                View view = getView();
+                if (view != null && error != null) {
+                    Snackbar.make(view, error.getMessage(), Snackbar.LENGTH_LONG).
                             setBackgroundTint(Color.RED).setTextColor(Color.WHITE).show();
+                }
                 Helper.setViewEnabled(buttonResend, true);
             }
         });

app/src/main/java/io/lbry/browser/ui/wallet/WalletFragment.java

@@ -409,14 +409,22 @@ public class WalletFragment extends BaseFragment implements SdkStatusListener, W
         // wallet_send task
         String recipientAddress = Helper.getValue(inputSendAddress.getText());
         String amountString = Helper.getValue(inputSendAmount.getText());
-        String amount = new DecimalFormat(Helper.SDK_AMOUNT_FORMAT, new DecimalFormatSymbols(Locale.US)).
+        String amount = null;
+        try {
+            amount = new DecimalFormat(Helper.SDK_AMOUNT_FORMAT, new DecimalFormatSymbols(Locale.US)).
                     format(new BigDecimal(amountString).doubleValue());
+        } catch (NumberFormatException ex) {
+            Snackbar.make(getView(), R.string.invalid_amount, Snackbar.LENGTH_LONG).
+                    setBackgroundTint(Color.RED).setTextColor(Color.WHITE).show();
+            return;
+        }
 
         disableSendControls();
+        double actualSendAmount = Double.valueOf(amount);
         WalletSendTask task = new WalletSendTask(recipientAddress, amount, walletSendProgress, new WalletSendTask.WalletSendHandler() {
             @Override
             public void onSuccess() {
-                double sentAmount = Double.valueOf(amount);
+                double sentAmount = actualSendAmount;
                 String message = getResources().getQuantityString(
                         R.plurals.you_sent_credits, sentAmount == 1.0 ? 1 : 2,
                         new DecimalFormat("#,###.##").format(sentAmount));
@@ -530,8 +538,11 @@ public class WalletFragment extends BaseFragment implements SdkStatusListener, W
             }
             @Override
             public void onSuccess(String newAddress) {
-                SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getContext());
+                Context context = getContext();
+                if (context != null) {
+                    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
                     sp.edit().putString(MainActivity.PREFERENCE_KEY_INTERNAL_WALLET_RECEIVE_ADDRESS, newAddress).apply();
+                }
                 Helper.setViewText(textWalletReceiveAddress, newAddress);
                 Helper.setViewEnabled(buttonGetNewAddress, true);
             }

app/src/main/java/io/lbry/browser/utils/LbryUri.java

@@ -66,6 +66,10 @@ public class LbryUri {
                 REGEX_PART_MODIFIER_SEPARATOR));
 
         String cleanUrl = url, queryString = null;
+        if (Helper.isNullOrEmpty(url)) {
+            throw new LbryUriException("Invalid url parameter.");
+        }
+
         Matcher qsMatcher = PATTERN_SEPARATE_QUERY_STRING.matcher(url);
         if (qsMatcher.matches()) {
             queryString = qsMatcher.group(2);

app/src/main/res/values/strings.xml

@@ -87,6 +87,7 @@
     <string name="please_select_channel">Please select a channel to post your comment as.</string>
     <string name="post_comment">Post comment with tip?</string>
     <string name="comment_posted">Your comment was successfully posted.</string>
+    <string name="please_select_repost_channel">Please select a channel to repost on.</string>
     <plurals name="post_for_credits">
         <item quantity="one">Post for %1$s credit</item>
         <item quantity="other">Post for %1$s credits</item>
@@ -137,6 +138,7 @@
     <string name="show_extra_fields">Show extra fields</string>
     <string name="hide_extra_fields">Hide extra fields</string>
     <string name="no_file_found">No file found to publish.</string>
+    <string name="publish_invalid_claim_type">Invalid claim specified for editing.</string>
     <string name="video_optimization">Video optimization</string>
     <string name="thumbnail_creation_failed">A thumbnail could not be automatically created from your content file.</string>
     <string name="video_being_optimized">Your video is being optimized for better support on a wide range of devices. You can fill out the remaining fields below while this is in progress.</string>
@@ -405,6 +407,7 @@
     <string name="verify">Verify</string>
     <string name="please_enter_valid_phone">Please enter a valid phone number.</string>
     <string name="please_enter_verification_code">Please enter the verification code sent to your phone number.</string>
+    <string name="fetch_current_user_error">User account could not be retrieved at this time. Please try again later.</string>
 
     <!-- Forms -->
     <string name="no_added_tags">You have not added any tags yet. Add tags to improve discovery.</string>