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Code Issues Projects Releases Wiki Activity

[android] Save and restore list position of conversation across restarts

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This commit is contained in:
Torsten Grote
2018-12-11 13:08:26 -02:00
committed by akwizgran
parent 9b796c7cc3
commit 374fc7035b
2 changed files with 32 additions and 6 deletions
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35
briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java
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@@ -8,6 +8,7 @@ import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.annotation.Nullable;
import android.support.annotation.UiThread;
import android.support.design.widget.Snackbar;
@@ -193,6 +194,8 @@ public class ConversationActivity extends BriarActivity
ViewModelProvider.Factory viewModelFactory;
private volatile ContactId contactId;
@Nullable
private Parcelable layoutManagerState;
private final Observer<String> contactNameObserver = name -> {
requireNonNull(name);
@@ -317,6 +320,21 @@ public class ConversationActivity extends BriarActivity
list.stopPeriodicUpdate();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (layoutManager != null) {
layoutManagerState = layoutManager.onSaveInstanceState();
outState.putParcelable("layoutManager", layoutManagerState);
}
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
layoutManagerState = savedInstanceState.getParcelable("layoutManager");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
@@ -436,8 +454,12 @@ public class ConversationActivity extends BriarActivity
List<ConversationItem> items = createItems(headers);
adapter.addAll(items);
list.showData();
// Scroll to the bottom
list.scrollToPosition(adapter.getItemCount() - 1);
if (layoutManagerState == null) {
// Scroll to the bottom
list.scrollToPosition(adapter.getItemCount() - 1);
} else {
layoutManager.onRestoreInstanceState(layoutManagerState);
}
} else {
LOG.info("Concurrent update, reloading");
loadMessages();
@@ -479,7 +501,8 @@ public class ConversationActivity extends BriarActivity
adapter.getMessageItem(m);
if (pair != null) {
pair.getSecond().setText(text);
boolean bottom = adapter.isScrolledToBottom(layoutManager);
boolean bottom = layoutManagerState == null &&
adapter.isScrolledToBottom(layoutManager);
adapter.notifyItemChanged(pair.getFirst());
if (bottom) list.scrollToPosition(adapter.getItemCount() - 1);
}
@@ -510,7 +533,8 @@ public class ConversationActivity extends BriarActivity
adapter.getMessageItem(m);
if (pair != null) {
pair.getSecond().setAttachments(items);
boolean bottom = adapter.isScrolledToBottom(layoutManager);
boolean bottom = layoutManagerState == null &&
adapter.isScrolledToBottom(layoutManager);
adapter.notifyItemChanged(pair.getFirst());
if (bottom) list.scrollToPosition(adapter.getItemCount() - 1);
}
@@ -561,7 +585,8 @@ public class ConversationActivity extends BriarActivity
private void addConversationItem(ConversationItem item) {
runOnUiThreadUnlessDestroyed(() -> {
boolean bottom = adapter.isScrolledToBottom(layoutManager);
boolean bottom = layoutManagerState == null &&
adapter.isScrolledToBottom(layoutManager);
adapter.incrementRevision();
adapter.add(item);
if (bottom) list.scrollToPosition(adapter.getItemCount() - 1);