[android] Allow sending message with attachments before previews are loaded

briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreview.java

@@ -68,7 +68,7 @@ public class ImagePreview extends ConstraintLayout {
 			imageList.setLayoutParams(params);
 		}
 		setVisibility(VISIBLE);
-		ImagePreviewAdapter adapter = new ImagePreviewAdapter(items, listener);
+		ImagePreviewAdapter adapter = new ImagePreviewAdapter(items);
 		imageList.setAdapter(adapter);
 	}
 
@@ -79,16 +79,6 @@ public class ImagePreview extends ConstraintLayout {
 	}
 
 	interface ImagePreviewListener {
-
-		void onPreviewLoaded();
-
-		/**
-		 * Called when Glide can't load a preview image.
-		 *
-		 * Warning: Glide may call this multiple times.
-		 */
-		void onError();
-
 		void onCancel();
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewAdapter.java

@@ -9,7 +9,6 @@ import android.view.ViewGroup;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.conversation.AttachmentResult;
-import org.briarproject.briar.android.view.ImagePreview.ImagePreviewListener;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -22,14 +21,11 @@ import static java.util.Objects.requireNonNull;
 class ImagePreviewAdapter extends Adapter<ImagePreviewViewHolder> {
 
 	private final List<ImagePreviewItem> items;
-	private final ImagePreviewListener listener;
 	@LayoutRes
 	private final int layout;
 
-	ImagePreviewAdapter(Collection<ImagePreviewItem> items,
-			ImagePreviewListener listener) {
+	ImagePreviewAdapter(Collection<ImagePreviewItem> items) {
 		this.items = new ArrayList<>(items);
-		this.listener = listener;
 		this.layout = items.size() == 1 ?
 				R.layout.list_item_image_preview_single :
 				R.layout.list_item_image_preview;
@@ -40,7 +36,7 @@ class ImagePreviewAdapter extends Adapter<ImagePreviewViewHolder> {
 			int type) {
 		View v = LayoutInflater.from(viewGroup.getContext())
 				.inflate(layout, viewGroup, false);
-		return new ImagePreviewViewHolder(v, requireNonNull(listener));
+		return new ImagePreviewViewHolder(v);
 	}
 
 	@Override

briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewViewHolder.java

@@ -16,7 +16,6 @@ import com.bumptech.glide.request.target.Target;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.conversation.glide.GlideApp;
-import org.briarproject.briar.android.view.ImagePreview.ImagePreviewListener;
 
 import static android.view.View.INVISIBLE;
 import static com.bumptech.glide.load.engine.DiskCacheStrategy.NONE;
@@ -29,14 +28,11 @@ class ImagePreviewViewHolder extends ViewHolder {
 	@DrawableRes
 	private static final int ERROR_RES = R.drawable.ic_image_broken;
 
-	private final ImagePreviewListener listener;
-
 	private final ImageView imageView;
 	private final ProgressBar progressBar;
 
-	ImagePreviewViewHolder(View v, ImagePreviewListener listener) {
+	ImagePreviewViewHolder(View v) {
 		super(v);
-		this.listener = listener;
 		this.imageView = v.findViewById(R.id.imageView);
 		this.progressBar = v.findViewById(R.id.progressBar);
 	}
@@ -55,7 +51,6 @@ class ImagePreviewViewHolder extends ViewHolder {
 							Object model, Target<Drawable> target,
 							boolean isFirstResource) {
 						progressBar.setVisibility(INVISIBLE);
-						listener.onError();
 						return false;
 					}
 
@@ -64,7 +59,6 @@ class ImagePreviewViewHolder extends ViewHolder {
 							Object model, Target<Drawable> target,
 							DataSource dataSource, boolean isFirstResource) {
 						progressBar.setVisibility(INVISIBLE);
-						listener.onPreviewLoaded();
 						return false;
 					}
 				})

briar-android/src/main/java/org/briarproject/briar/android/view/TextAttachmentController.java

@@ -27,6 +27,7 @@ import java.util.List;
 import uk.co.samuelwall.materialtaptargetprompt.MaterialTapTargetPrompt;
 import uk.co.samuelwall.materialtaptargetprompt.MaterialTapTargetPrompt.PromptStateChangeListener;
 
+import static android.arch.lifecycle.Lifecycle.State.DESTROYED;
 import static android.content.Intent.ACTION_GET_CONTENT;
 import static android.content.Intent.ACTION_OPEN_DOCUMENT;
 import static android.content.Intent.CATEGORY_OPENABLE;
@@ -56,8 +57,8 @@ public class TextAttachmentController extends TextSendController
 
 	private CharSequence textHint;
 	private List<Uri> imageUris = emptyList();
-	private int previewsLoaded = 0;
-	private boolean loadingPreviews = false;
+	private int urisLoaded = 0;
+	private boolean loadingUris = false;
 
 	public TextAttachmentController(TextInputView v, ImagePreview imagePreview,
 			SendListener listener, AttachImageListener imageListener,
@@ -76,10 +77,10 @@ public class TextAttachmentController extends TextSendController
 
 	@Override
 	protected void updateViewState() {
-		textInput.setEnabled(ready && !loadingPreviews);
-		boolean sendEnabled = ready && !loadingPreviews &&
+		textInput.setEnabled(ready && !loadingUris);
+		boolean sendEnabled = ready && !loadingUris &&
 				(!textIsEmpty || canSendEmptyText());
-		if (loadingPreviews) {
+		if (loadingUris) {
 			sendButton.showProgress(true);
 		} else if (imageUris.isEmpty()) {
 			sendButton.showProgress(false);
@@ -121,7 +122,9 @@ public class TextAttachmentController extends TextSendController
 			return;
 		}
 		Intent intent = getAttachFileIntent();
-		requireNonNull(imageListener).onAttachImage(intent);
+		if (imageListener.getLifecycle().getCurrentState() != DESTROYED) {
+			requireNonNull(imageListener).onAttachImage(intent);
+		}
 	}
 
 	private Intent getAttachFileIntent() {
@@ -152,7 +155,7 @@ public class TextAttachmentController extends TextSendController
 
 	private void onNewUris() {
 		if (imageUris.isEmpty()) return;
-		loadingPreviews = true;
+		loadingUris = true;
 		updateViewState();
 		textInput.setHint(R.string.image_caption_hint);
 		List<ImagePreviewItem> items = ImagePreviewItem.fromUris(imageUris);
@@ -170,6 +173,8 @@ public class TextAttachmentController extends TextSendController
 			onError(result.getErrorMsg());
 		} else {
 			imagePreview.loadPreviewImage(result);
+			urisLoaded++;
+			checkAllUrisLoaded();
 		}
 	}
 
@@ -180,9 +185,9 @@ public class TextAttachmentController extends TextSendController
 		imagePreview.setVisibility(GONE);
 		// reset image URIs
 		imageUris = emptyList();
-		// no preview has been loaded
-		previewsLoaded = 0;
-		loadingPreviews = false;
+		// no URIs has been loaded
+		urisLoaded = 0;
+		loadingUris = false;
 		// show the image button again, so images can get attached
 		updateViewState();
 	}
@@ -204,17 +209,6 @@ public class TextAttachmentController extends TextSendController
 		return state.getSuperState();
 	}
 
-	@Override
-	public void onPreviewLoaded() {
-		previewsLoaded++;
-		checkAllPreviewsLoaded();
-	}
-
-	@Override
-	public void onError() {
-		onError(null);
-	}
-
 	@UiThread
 	private void onError(@Nullable String errorMsg) {
 		if (errorMsg == null) {
@@ -232,10 +226,10 @@ public class TextAttachmentController extends TextSendController
 		reset();
 	}
 
-	private void checkAllPreviewsLoaded() {
-		if (previewsLoaded == imageUris.size()) {
-			loadingPreviews = false;
-			// all previews were loaded
+	private void checkAllUrisLoaded() {
+		if (urisLoaded == imageUris.size()) {
+			loadingUris = false;
+			// all images were turned into attachments
 			updateViewState();
 		}
 	}