Drop Android 4.4 Support

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

build.gradle

@@ -98,9 +98,6 @@ for (TaskExecutionRequest tr : getGradle().getStartParameter().getTaskRequests()
             apply from: 'gplay.gradle'
             System.console().println("Applying gplay.gradle")
         }
-        if (arg.contains("lint")) {
-            testMinSdk = 19
-        }
     }
 }
 
@@ -129,7 +126,7 @@ android {
     compileSdkVersion 29
 
     defaultConfig {
-        minSdkVersion 19
+        minSdkVersion 21
         targetSdkVersion 29
 
         // arguments to be passed to functional tests

src/main/java/com/owncloud/android/MainApp.java

@@ -384,21 +384,30 @@ public class MainApp extends MultiDexApplication implements HasAndroidInjector {
     @SuppressLint("ApplySharedPref") // commit is done on purpose to write immediately
     private void fixStoragePath() {
         if (!preferences.isStoragePathFixEnabled()) {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-                StoragePoint[] storagePoints = DataStorageProvider.getInstance().getAvailableStoragePoints();
-                String storagePath = preferences.getStoragePath("");
-
-                if (TextUtils.isEmpty(storagePath)) {
-                    if (preferences.getLastSeenVersionCode() != 0) {
-                        // We already used the app, but no storage is set - fix that!
-                        preferences.setStoragePath(Environment.getExternalStorageDirectory().getAbsolutePath());
-                        preferences.removeKeysMigrationPreference();
-                    } else {
-                        // find internal storage path that's indexable
-                        boolean set = false;
+            StoragePoint[] storagePoints = DataStorageProvider.getInstance().getAvailableStoragePoints();
+            String storagePath = preferences.getStoragePath("");
+
+            if (TextUtils.isEmpty(storagePath)) {
+                if (preferences.getLastSeenVersionCode() != 0) {
+                    // We already used the app, but no storage is set - fix that!
+                    preferences.setStoragePath(Environment.getExternalStorageDirectory().getAbsolutePath());
+                    preferences.removeKeysMigrationPreference();
+                } else {
+                    // find internal storage path that's indexable
+                    boolean set = false;
+                    for (StoragePoint storagePoint : storagePoints) {
+                        if (storagePoint.getStorageType() == StoragePoint.StorageType.INTERNAL &&
+                            storagePoint.getPrivacyType() == StoragePoint.PrivacyType.PUBLIC) {
+                            preferences.setStoragePath(storagePoint.getPath());
+                            preferences.removeKeysMigrationPreference();
+                            set = true;
+                            break;
+                        }
+                    }
+
+                    if (!set) {
                         for (StoragePoint storagePoint : storagePoints) {
-                            if (storagePoint.getStorageType() == StoragePoint.StorageType.INTERNAL &&
-                                storagePoint.getPrivacyType() == StoragePoint.PrivacyType.PUBLIC) {
+                            if (storagePoint.getPrivacyType() == StoragePoint.PrivacyType.PUBLIC) {
                                 preferences.setStoragePath(storagePoint.getPath());
                                 preferences.removeKeysMigrationPreference();
                                 set = true;
@@ -406,27 +415,10 @@ public class MainApp extends MultiDexApplication implements HasAndroidInjector {
                             }
                         }
 
-                        if (!set) {
-                            for (StoragePoint storagePoint : storagePoints) {
-                                if (storagePoint.getPrivacyType() == StoragePoint.PrivacyType.PUBLIC) {
-                                    preferences.setStoragePath(storagePoint.getPath());
-                                    preferences.removeKeysMigrationPreference();
-                                    set = true;
-                                    break;
-                                }
-                            }
-
-                        }
                     }
-                    preferences.setStoragePathFixEnabled(true);
-                } else {
-                    preferences.removeKeysMigrationPreference();
-                    preferences.setStoragePathFixEnabled(true);
                 }
+                preferences.setStoragePathFixEnabled(true);
             } else {
-                if (TextUtils.isEmpty(storagePath)) {
-                    preferences.setStoragePath(Environment.getExternalStorageDirectory().getAbsolutePath());
-                }
                 preferences.removeKeysMigrationPreference();
                 preferences.setStoragePathFixEnabled(true);
             }
@@ -479,12 +471,10 @@ public class MainApp extends MultiDexApplication implements HasAndroidInjector {
                                                     connectivityService,
                                                     powerManagementService);
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            ReceiversHelper.registerPowerSaveReceiver(uploadsStorageManager,
-                                                      accountManager,
-                                                      connectivityService,
-                                                      powerManagementService);
-        }
+        ReceiversHelper.registerPowerSaveReceiver(uploadsStorageManager,
+                                                  accountManager,
+                                                  connectivityService,
+                                                  powerManagementService);
     }
 
     public static void notificationChannels() {

src/main/java/com/owncloud/android/authentication/AuthenticatorActivity.java

@@ -330,13 +330,7 @@ public class AuthenticatorActivity extends AccountAuthenticatorActivity
     private void deleteCookies() {
         try {
             CookieSyncManager.createInstance(this);
-            CookieManager cookieManager = CookieManager.getInstance();
-
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-                cookieManager.removeAllCookies(null);
-            } else {
-                cookieManager.removeAllCookie();
-            }
+            CookieManager.getInstance().removeAllCookies(null);
         } catch (AndroidRuntimeException e) {
             Log_OC.e(TAG, e.getMessage());
         }
@@ -439,9 +433,7 @@ public class AuthenticatorActivity extends AccountAuthenticatorActivity
                 mLoginWebView.setVisibility(View.VISIBLE);
 
                 ThemeUtils.colorStatusBar(AuthenticatorActivity.this, primaryColor);
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-                    getWindow().setNavigationBarColor(primaryColor);
-                }
+                getWindow().setNavigationBarColor(primaryColor);
             }
 
             @Override

src/main/java/com/owncloud/android/datastorage/DataStorageProvider.java

@@ -21,7 +21,6 @@
 
 package com.owncloud.android.datastorage;
 
-import android.os.Build;
 import android.os.Environment;
 
 import com.owncloud.android.MainApp;
@@ -67,34 +66,22 @@ public class DataStorageProvider {
 
         List<String> paths = new ArrayList<>();
         StoragePoint storagePoint;
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            for (File f : MainApp.getAppContext().getExternalMediaDirs()) {
-                if (f != null && !paths.contains(f.getAbsolutePath())) {
-                    storagePoint = new StoragePoint();
-                    storagePoint.setPath(f.getAbsolutePath());
-                    storagePoint.setDescription(f.getAbsolutePath());
-                    storagePoint.setPrivacyType(StoragePoint.PrivacyType.PUBLIC);
-                    if (f.getAbsolutePath().startsWith("/storage/emulated/0")) {
-                        storagePoint.setStorageType(StoragePoint.StorageType.INTERNAL);
+        for (File f : MainApp.getAppContext().getExternalMediaDirs()) {
+            if (f != null && !paths.contains(f.getAbsolutePath())) {
+                storagePoint = new StoragePoint();
+                storagePoint.setPath(f.getAbsolutePath());
+                storagePoint.setDescription(f.getAbsolutePath());
+                storagePoint.setPrivacyType(StoragePoint.PrivacyType.PUBLIC);
+                if (f.getAbsolutePath().startsWith("/storage/emulated/0")) {
+                    storagePoint.setStorageType(StoragePoint.StorageType.INTERNAL);
+                    mCachedStoragePoints.add(storagePoint);
+                } else {
+                    storagePoint.setStorageType(StoragePoint.StorageType.EXTERNAL);
+                    if (isExternalStorageWritable()) {
                         mCachedStoragePoints.add(storagePoint);
-                    } else {
-                        storagePoint.setStorageType(StoragePoint.StorageType.EXTERNAL);
-                        if (isExternalStorageWritable()) {
-                            mCachedStoragePoints.add(storagePoint);
-                        }
                     }
                 }
             }
-        } else {
-            for (IStoragePointProvider p : mStorageProviders) {
-                if (p.canProvideStoragePoints()) {
-                    mCachedStoragePoints.addAll(p.getAvailableStoragePoint());
-                }
-            }
-
-            for (int i = 0; i < mCachedStoragePoints.size(); i++) {
-                paths.add(mCachedStoragePoints.get(i).getPath());
-            }
         }
 
         // Now we go add private ones

src/main/java/com/owncloud/android/files/FileMenuFilter.java

@@ -23,7 +23,6 @@ package com.owncloud.android.files;
 
 import android.content.ContentResolver;
 import android.content.Context;
-import android.os.Build;
 import android.view.Menu;
 import android.view.MenuItem;
 
@@ -333,7 +332,7 @@ public class FileMenuFilter {
      */
     @NextcloudServer(max = 18)
     private boolean isRichDocumentEditingSupported(OCCapability capability, String mimeType) {
-        return isSingleFile() && android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP &&
+        return isSingleFile() &&
             (capability.getRichDocumentsMimeTypeList().contains(mimeType) ||
                 capability.getRichDocumentsOptionalMimeTypeList().contains(mimeType)) &&
             capability.getRichDocumentsDirectEditing().isTrue();

src/main/java/com/owncloud/android/providers/DocumentsStorageProvider.java

@@ -26,7 +26,6 @@ import android.accounts.Account;
 import android.accounts.AuthenticatorException;
 import android.accounts.OperationCanceledException;
 import android.annotation.SuppressLint;
-import android.annotation.TargetApi;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.res.AssetFileDescriptor;
@@ -34,7 +33,6 @@ import android.database.Cursor;
 import android.graphics.Point;
 import android.net.Uri;
 import android.os.AsyncTask;
-import android.os.Build;
 import android.os.Bundle;
 import android.os.CancellationSignal;
 import android.os.Handler;
@@ -574,7 +572,6 @@ public class DocumentsStorageProvider extends DocumentsProvider {
         context.getContentResolver().notifyChange(toNotifyUri(parentFolder), null, false);
     }
 
-    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     private void recursiveRevokePermission(Document document) {
         FileDataStorageManager storageManager = document.getStorageManager();
         OCFile file = document.getFile();

src/main/java/com/owncloud/android/ui/activity/EditorWebView.java

@@ -112,7 +112,6 @@ public abstract class EditorWebView extends ExternalSiteWebView {
         finish();
     }
 
-    @SuppressLint("AddJavascriptInterface") // suppress warning as webview is only used >= Lollipop
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         webViewLayout = R.layout.richdocuments_webview; // TODO rename

src/main/java/com/owncloud/android/ui/activity/PassCodeActivity.java

@@ -23,7 +23,6 @@
 package com.owncloud.android.ui.activity;
 
 import android.content.Intent;
-import android.os.Build;
 import android.os.Bundle;
 import android.os.SystemClock;
 import android.text.Editable;
@@ -364,12 +363,12 @@ public class PassCodeActivity extends AppCompatActivity implements Injectable {
      * @return              'True' when the key event was processed by this method.
      */
     @Override
-    public boolean onKeyDown(int keyCode, KeyEvent event){
-        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount()== 0){
-            if(ACTION_CHECK.equals(getIntent().getAction()) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
+            if (ACTION_CHECK.equals(getIntent().getAction())) {
                 moveTaskToBack(true);
                 finishAndRemoveTask();
-            }else if (ACTION_REQUEST_WITH_RESULT.equals(getIntent().getAction()) ||
+            } else if (ACTION_REQUEST_WITH_RESULT.equals(getIntent().getAction()) ||
                 ACTION_CHECK_WITH_RESULT.equals(getIntent().getAction())) {
                 finish();
             }// else, do nothing, but report that the key was consumed to stay alive

src/main/java/com/owncloud/android/ui/activity/RichDocumentsEditorWebView.java

@@ -62,7 +62,6 @@ import java.lang.ref.WeakReference;
 import javax.inject.Inject;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.RequiresApi;
 import butterknife.ButterKnife;
 import butterknife.Unbinder;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
@@ -70,7 +69,6 @@ import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 /**
  * Opens document for editing via Richdocuments app in a web view
  */
-@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 public class RichDocumentsEditorWebView extends EditorWebView {
     public static final int REQUEST_LOCAL_FILE = 101;
     private static final int REQUEST_REMOTE_FILE = 100;
@@ -92,7 +90,6 @@ public class RichDocumentsEditorWebView extends EditorWebView {
     protected ClientFactory clientFactory;
 
     @SuppressFBWarnings("ANDROID_WEB_VIEW_JAVASCRIPT_INTERFACE")
-    @SuppressLint("AddJavascriptInterface") // suppress warning as webview is only used >= Lollipop
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

src/main/java/com/owncloud/android/ui/activity/ToolbarActivity.java

@@ -27,7 +27,6 @@ import android.annotation.SuppressLint;
 import android.graphics.Bitmap;
 import android.graphics.Color;
 import android.graphics.drawable.Drawable;
-import android.os.Build;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.FrameLayout;
@@ -50,7 +49,6 @@ import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.widget.AppCompatSpinner;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.content.ContextCompat;
-import androidx.core.view.ViewCompat;
 
 /**
  * Base class providing toolbar registration functionality, see {@link #setupToolbar(boolean, boolean)}.
@@ -161,22 +159,14 @@ public abstract class ToolbarActivity extends BaseActivity {
     @SuppressLint("PrivateResource")
     private void showHomeSearchToolbar(boolean isShow) {
         if (isShow) {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-                mAppBar.setStateListAnimator(AnimatorInflater.loadStateListAnimator(mAppBar.getContext(),
-                                                                                    R.animator.appbar_elevation_off));
-            } else {
-                ViewCompat.setElevation(mAppBar, 0);
-            }
+            mAppBar.setStateListAnimator(AnimatorInflater.loadStateListAnimator(mAppBar.getContext(),
+                                                                                R.animator.appbar_elevation_off));
             mDefaultToolbar.setVisibility(View.GONE);
             mHomeSearchToolbar.setVisibility(View.VISIBLE);
             ThemeUtils.colorStatusBar(this, ContextCompat.getColor(this, R.color.bg_default));
         } else {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-                mAppBar.setStateListAnimator(AnimatorInflater.loadStateListAnimator(mAppBar.getContext(),
-                                                                                    R.animator.appbar_elevation_on));
-            } else {
-                ViewCompat.setElevation(mAppBar, getResources().getDimension(R.dimen.design_appbar_elevation));
-            }
+            mAppBar.setStateListAnimator(AnimatorInflater.loadStateListAnimator(mAppBar.getContext(),
+                                                                                R.animator.appbar_elevation_on));
             mDefaultToolbar.setVisibility(View.VISIBLE);
             mHomeSearchToolbar.setVisibility(View.GONE);
             ThemeUtils.colorStatusBar(this);

src/main/java/com/owncloud/android/ui/adapter/PrintAdapter.java

@@ -21,7 +21,6 @@
 
 package com.owncloud.android.ui.adapter;
 
-import android.os.Build;
 import android.os.Bundle;
 import android.os.CancellationSignal;
 import android.os.ParcelFileDescriptor;
@@ -40,9 +39,6 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.Objects;
 
-import androidx.annotation.RequiresApi;
-
-@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 public class PrintAdapter extends PrintDocumentAdapter {
     private static final String TAG = PrintAdapter.class.getSimpleName();
     private static final String PDF_NAME = "finalPrint.pdf";

src/main/java/com/owncloud/android/ui/asynctasks/PrintAsyncTask.java

@@ -22,7 +22,6 @@
 package com.owncloud.android.ui.asynctasks;
 
 import android.os.AsyncTask;
-import android.os.Build;
 import android.print.PrintAttributes;
 import android.print.PrintDocumentAdapter;
 import android.print.PrintManager;
@@ -44,11 +43,8 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.lang.ref.WeakReference;
 
-import androidx.annotation.RequiresApi;
-
 import static android.content.Context.PRINT_SERVICE;
 
-@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 public class PrintAsyncTask extends AsyncTask<Void, Void, Boolean> {
     private static final String TAG = PrintAsyncTask.class.getSimpleName();
     private static final String JOB_NAME = "Document";

src/main/java/com/owncloud/android/ui/fragment/OCFileListBottomSheetDialog.java

@@ -21,7 +21,6 @@
 package com.owncloud.android.ui.fragment;
 
 import android.content.Context;
-import android.os.Build;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -127,7 +126,6 @@ public class OCFileListBottomSheetDialog extends BottomSheetDialog {
         OCCapability capability = fileActivity.getCapabilities();
         if (capability.getRichDocuments().isTrue() &&
             capability.getRichDocumentsDirectEditing().isTrue() &&
-            android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP &&
             capability.getRichDocumentsTemplatesAvailable().isTrue() &&
             !file.isEncrypted()) {
             templates.setVisibility(View.VISIBLE);
@@ -137,7 +135,6 @@ public class OCFileListBottomSheetDialog extends BottomSheetDialog {
             .getValue(user, ArbitraryDataProvider.DIRECT_EDITING);
 
         if (!json.isEmpty() &&
-            android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP &&
             !file.isEncrypted()) {
             DirectEditing directEditing = new Gson().fromJson(json, DirectEditing.class);
 
@@ -174,8 +171,7 @@ public class OCFileListBottomSheetDialog extends BottomSheetDialog {
         }
 
         // create rich workspace
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP &&
-            FileMenuFilter.isEditorAvailable(getContext().getContentResolver(),
+        if (FileMenuFilter.isEditorAvailable(getContext().getContentResolver(),
                                              user,
                                              MimeTypeUtil.MIMETYPE_TEXT_MARKDOWN) &&
             file != null && !file.isEncrypted()) {

src/main/java/com/owncloud/android/ui/fragment/OCFileListFragment.java

@@ -29,7 +29,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.graphics.Color;
 import android.os.AsyncTask;
-import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
@@ -1021,11 +1020,9 @@ public class OCFileListFragment extends ExtendedListFragment implements
                         } else if (FileMenuFilter.isEditorAvailable(requireContext().getContentResolver(),
                                                                     accountManager.getUser(),
                                                                     file.getMimeType()) &&
-                            !file.isEncrypted() &&
-                            android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+                            !file.isEncrypted()) {
                             mContainerActivity.getFileOperationsHelper().openFileWithTextEditor(file, getContext());
                         } else if (capability.getRichDocumentsMimeTypeList().contains(file.getMimeType()) &&
-                            android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP &&
                             capability.getRichDocumentsDirectEditing().isTrue() && !file.isEncrypted()) {
                             mContainerActivity.getFileOperationsHelper().openFileAsRichDocument(file, getContext());
                         } else {
@@ -1091,22 +1088,15 @@ public class OCFileListFragment extends ExtendedListFragment implements
                 }
                 case R.id.action_edit: {
                     // should not be necessary, as menu item is filtered, but better play safe
-                    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-                        if (FileMenuFilter.isEditorAvailable(requireContext().getContentResolver(),
-                                                             accountManager.getUser(),
-                                                             singleFile.getMimeType())) {
-                            mContainerActivity.getFileOperationsHelper().openFileWithTextEditor(singleFile,
-                                                                                                getContext());
-                        } else {
-                            mContainerActivity.getFileOperationsHelper().openFileAsRichDocument(singleFile,
-                                                                                                getContext());
-                        }
-
-                        return true;
+                    if (FileMenuFilter.isEditorAvailable(requireContext().getContentResolver(),
+                                                         accountManager.getUser(),
+                                                         singleFile.getMimeType())) {
+                        mContainerActivity.getFileOperationsHelper().openFileWithTextEditor(singleFile, getContext());
                     } else {
-                        DisplayUtils.showSnackMessage(getView(), "Not supported on older than Android 5");
-                        return false;
+                        mContainerActivity.getFileOperationsHelper().openFileAsRichDocument(singleFile, getContext());
                     }
+
+                    return true;
                 }
                 case R.id.action_rename_file: {
                     RenameFileDialogFragment dialog = RenameFileDialogFragment.newInstance(singleFile);

src/main/java/com/owncloud/android/ui/helpers/FileOperationsHelper.java

@@ -104,7 +104,6 @@ import java.util.regex.Pattern;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.annotation.RequiresApi;
 import androidx.core.content.FileProvider;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentTransaction;
@@ -288,14 +287,12 @@ public class FileOperationsHelper {
 
                 if (optionalUser.isPresent() && FileMenuFilter.isEditorAvailable(fileActivity.getContentResolver(),
                                                                                  optionalUser.get(),
-                                                                                 file.getMimeType()) &&
-                    android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+                                                                                 file.getMimeType())) {
                     openFileWithTextEditor(file, fileActivity);
                 } else {
                     Account account = fileActivity.getAccount();
                     OCCapability capability = fileActivity.getStorageManager().getCapability(account.name);
                     if (capability.getRichDocumentsMimeTypeList().contains(file.getMimeType()) &&
-                        android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP &&
                         capability.getRichDocumentsDirectEditing().isTrue()) {
                         openFileAsRichDocument(file, fileActivity);
                         return;
@@ -360,7 +357,6 @@ public class FileOperationsHelper {
         }
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
     public void openFileAsRichDocument(OCFile file, Context context) {
         Intent collaboraWebViewIntent = new Intent(context, RichDocumentsEditorWebView.class);
         collaboraWebViewIntent.putExtra(ExternalSiteWebView.EXTRA_TITLE, "Collabora");
@@ -369,7 +365,6 @@ public class FileOperationsHelper {
         context.startActivity(collaboraWebViewIntent);
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
     public void openFileWithTextEditor(OCFile file, Context context) {
         Intent textEditorIntent = new Intent(context, TextEditorWebView.class);
         textEditorIntent.putExtra(ExternalSiteWebView.EXTRA_TITLE, "Text");

src/main/java/com/owncloud/android/ui/preview/PreviewTextFileFragment.java

@@ -24,7 +24,6 @@ package com.owncloud.android.ui.preview;
 
 import android.accounts.Account;
 import android.os.AsyncTask;
-import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.view.Menu;
@@ -289,10 +288,6 @@ public class PreviewTextFileFragment extends PreviewTextFragment {
             menu.findItem(R.id.action_unset_favorite)
         );
 
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
-            FileMenuFilter.hideMenuItem(menu.findItem(R.id.action_edit));
-        }
-
         if (getFile().isSharedWithMe() && !getFile().canReshare()) {
             FileMenuFilter.hideMenuItem(menu.findItem(R.id.action_send_share_file));
         }
@@ -331,11 +326,8 @@ public class PreviewTextFileFragment extends PreviewTextFragment {
             }
 
             case R.id.action_edit:
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-                    containerActivity.getFileOperationsHelper().openFileWithTextEditor(getFile(), getContext());
-                    return true;
-                }
-                return false;
+                containerActivity.getFileOperationsHelper().openFileWithTextEditor(getFile(), getContext());
+                return true;
 
             default:
                 return super.onOptionsItemSelected(item);

src/main/java/com/owncloud/android/ui/preview/PreviewTextStringFragment.java

@@ -104,15 +104,10 @@ public class PreviewTextStringFragment extends PreviewTextFragment {
         }
 
         FloatingActionButton fabMain = requireActivity().findViewById(R.id.fab_main);
-
-        if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
-            fabMain.setVisibility(View.GONE);
-        } else {
-            fabMain.setVisibility(View.VISIBLE);
-            fabMain.setEnabled(true);
-            fabMain.setOnClickListener(v -> edit());
-            ThemeUtils.colorFloatingActionButton(fabMain, R.drawable.ic_edit, requireContext());
-        }
+        fabMain.setVisibility(View.VISIBLE);
+        fabMain.setEnabled(true);
+        fabMain.setOnClickListener(v -> edit());
+        ThemeUtils.colorFloatingActionButton(fabMain, R.drawable.ic_edit, requireContext());
 
         return view;
     }

src/main/java/com/owncloud/android/utils/ThemeUtils.java

@@ -122,7 +122,7 @@ public final class ThemeUtils {
         }
     }
 
-    public static int calculateDarkColor(int color, Context context){
+    public static int calculateDarkColor(int color, Context context) {
         try {
             return adjustLightness(-0.2f, color, -1f);
         } catch (Exception e) {
@@ -364,7 +364,7 @@ public final class ThemeUtils {
     }
 
     public static void setStatusBarColor(Activity activity, @ColorInt int color) {
-        if (activity != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        if (activity != null) {
             activity.getWindow().setStatusBarColor(color);
         }
     }
@@ -450,11 +450,7 @@ public final class ThemeUtils {
      */
     public static void colorProgressBar(ProgressBar progressBar, @ColorInt int color) {
         if (progressBar != null) {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-                progressBar.setProgressTintList(ColorStateList.valueOf(color));
-            } else {
-                ThemeUtils.colorHorizontalProgressBar(progressBar, color);
-            }
+            progressBar.setProgressTintList(ColorStateList.valueOf(color));
         }
     }
 
@@ -491,7 +487,7 @@ public final class ThemeUtils {
     }
 
     /**
-     * Sets the color of the status bar to {@code color} on devices with OS version lollipop or higher.
+     * Sets the color of the status bar to {@code color}.
      *
      * @param fragmentActivity fragment activity
      * @param color            the color
@@ -499,7 +495,7 @@ public final class ThemeUtils {
     public static void colorStatusBar(Activity fragmentActivity, @ColorInt int color) {
         Window window = fragmentActivity.getWindow();
         boolean isLightTheme = lightTheme(color);
-        if (window != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        if (window != null) {
             window.setStatusBarColor(color);
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                 View decor = window.getDecorView();
@@ -668,7 +664,8 @@ public final class ThemeUtils {
 
     /**
      * Will change a menu item text tint
-     * @param item the menu item object
+     *
+     * @param item  the menu item object
      * @param color the wanted color (as resource or color)
      */
     public static void tintMenuItemText(MenuItem item, int color) {

src/main/java/org/nextcloud/providers/cursors/FileCursor.java

@@ -88,9 +88,7 @@ public class FileCursor extends MatrixCursor {
             flags = flags | Document.FLAG_DIR_SUPPORTS_CREATE;
         }
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            flags = Document.FLAG_SUPPORTS_RENAME | flags;
-        }
+        flags = Document.FLAG_SUPPORTS_RENAME | flags;
 
         newRow().add(Document.COLUMN_DOCUMENT_ID, document.getDocumentId())
                 .add(Document.COLUMN_DISPLAY_NAME, file.getFileName())

src/main/java/org/nextcloud/providers/cursors/RootCursor.java

@@ -43,10 +43,11 @@ public class RootCursor extends MatrixCursor {
     public void addRoot(DocumentsStorageProvider.Document document, Context context) {
         Account account = document.getAccount();
 
-        int rootFlags = Root.FLAG_SUPPORTS_CREATE | Root.FLAG_SUPPORTS_RECENTS | Root.FLAG_SUPPORTS_SEARCH;
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
-            rootFlags = rootFlags | Root.FLAG_SUPPORTS_IS_CHILD;
-        }
+        int rootFlags =
+            Root.FLAG_SUPPORTS_CREATE |
+                Root.FLAG_SUPPORTS_RECENTS |
+                Root.FLAG_SUPPORTS_SEARCH |
+                Root.FLAG_SUPPORTS_IS_CHILD;
 
         newRow().add(Root.COLUMN_ROOT_ID, account.name)
             .add(Root.COLUMN_DOCUMENT_ID, document.getDocumentId())