save latest crash log

closes #932
closes #419

mastodon/src/main/java/org/joinmastodon/android/MainActivity.java

@@ -31,18 +31,44 @@
 import org.parceler.Parcels;
 
 import androidx.annotation.Nullable;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.time.Instant;
+
 import me.grishka.appkit.FragmentStackActivity;
 import me.grishka.appkit.Nav;
 import me.grishka.appkit.api.Callback;
 import me.grishka.appkit.api.ErrorResponse;
 
 public class MainActivity extends FragmentStackActivity implements ProvidesAssistContent {
+	private static final String TAG="MainActivity";
+
 	@Override
 	protected void onCreate(@Nullable Bundle savedInstanceState){
 		AccountSession session=getCurrentSession();
 		UiUtils.setUserPreferredTheme(this, session);
 		super.onCreate(savedInstanceState);
 
+		Thread.UncaughtExceptionHandler defaultHandler=Thread.getDefaultUncaughtExceptionHandler();
+		Thread.setDefaultUncaughtExceptionHandler((t, e)->{
+			File file=new File(MastodonApp.context.getFilesDir(), "crash.log");
+			try(FileOutputStream out=new FileOutputStream(file)){
+				PrintWriter writer=new PrintWriter(out);
+				writer.println(BuildConfig.VERSION_NAME+" ("+BuildConfig.VERSION_CODE+")");
+				writer.println(Instant.now().toString());
+				writer.println();
+				e.printStackTrace(writer);
+				writer.flush();
+			}catch(IOException x){
+				Log.e(TAG, "Error writing crash.log", x);
+			}finally{
+				defaultHandler.uncaughtException(t, e);
+			}
+		});
+
 		if(savedInstanceState==null){
 			restartHomeFragment();
 		}

mastodon/src/main/java/org/joinmastodon/android/fragments/settings/SettingsAboutAppFragment.java

@@ -2,13 +2,15 @@
 
 import android.app.Activity;
 import android.os.Bundle;
+import android.util.Log;
 import android.view.Gravity;
 import android.view.ViewGroup;
 import android.widget.TextView;
 import android.widget.Toast;
 
 import org.joinmastodon.android.BuildConfig;
 import org.joinmastodon.android.GlobalUserPreferences;
+import org.joinmastodon.android.MastodonApp;
 import org.joinmastodon.android.R;
 import org.joinmastodon.android.api.MastodonAPIController;
 import org.joinmastodon.android.api.session.AccountSession;
@@ -18,6 +20,19 @@
 import org.joinmastodon.android.ui.utils.UiUtils;
 import org.joinmastodon.android.updater.GithubSelfUpdater;
 
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.StringReader;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.time.format.FormatStyle;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -28,30 +43,37 @@
 import me.grishka.appkit.utils.V;
 
 public class SettingsAboutAppFragment extends BaseSettingsFragment<Void>{
-	private ListItem<Void> mediaCacheItem;
+	private static final String TAG="SettingsAboutAppFragment";
+	private ListItem<Void> mediaCacheItem, copyCrashLogItem;
 	private CheckableListItem<Void> enablePreReleasesItem;
 	private AccountSession session;
 	private boolean timelineCacheCleared=false;
+	private File crashLogFile=new File(MastodonApp.context.getFilesDir(), "crash.log");
 
 	@Override
 	public void onCreate(Bundle savedInstanceState){
 		super.onCreate(savedInstanceState);
 		setTitle(getString(R.string.about_app, getString(R.string.sk_app_name)));
 		session=AccountSessionManager.get(accountID);
 
+		String lastModified=crashLogFile.exists()
+				? DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG, FormatStyle.SHORT).withZone(ZoneId.systemDefault()).format(Instant.ofEpochMilli(crashLogFile.lastModified()))
+				: getString(R.string.sk_settings_crash_log_unavailable);
 		List<ListItem<Void>> items=new ArrayList<>(List.of(
 				new ListItem<>(R.string.sk_settings_donate, 0, R.drawable.ic_fluent_heart_24_regular, i->UiUtils.openHashtagTimeline(getActivity(), accountID, getString(R.string.donate_hashtag))),
 				new ListItem<>(R.string.sk_settings_contribute, 0, R.drawable.ic_fluent_open_24_regular, i->UiUtils.launchWebBrowser(getActivity(), getString(R.string.repo_url))),
 				new ListItem<>(R.string.settings_tos, 0, R.drawable.ic_fluent_open_24_regular, i->UiUtils.launchWebBrowser(getActivity(), "https://"+session.domain+"/terms")),
 				new ListItem<>(R.string.settings_privacy_policy, 0, R.drawable.ic_fluent_open_24_regular, i->UiUtils.launchWebBrowser(getActivity(), getString(R.string.privacy_policy_url)), 0, true),
 				mediaCacheItem=new ListItem<>(R.string.settings_clear_cache, 0, this::onClearMediaCacheClick),
-				new ListItem<>(getString(R.string.sk_settings_clear_timeline_cache), session.domain, this::onClearTimelineCacheClick)
+				new ListItem<>(getString(R.string.sk_settings_clear_timeline_cache), session.domain, this::onClearTimelineCacheClick),
+				copyCrashLogItem=new ListItem<>(getString(R.string.sk_settings_copy_crash_log), lastModified, 0, this::onCopyCrashLog)
 		));
 
 		if(GithubSelfUpdater.needSelfUpdating()){
 			items.add(enablePreReleasesItem=new CheckableListItem<>(R.string.sk_updater_enable_pre_releases, 0, CheckableListItem.Style.SWITCH, GlobalUserPreferences.enablePreReleases, i->toggleCheckableItem(enablePreReleasesItem)));
 		}
 
+		copyCrashLogItem.isEnabled=crashLogFile.exists();
 		onDataLoaded(items);
 		updateMediaCacheItem();
 	}
@@ -107,4 +129,17 @@ private void updateMediaCacheItem(){
 		mediaCacheItem.isEnabled=size>0;
 		rebindItem(mediaCacheItem);
 	}
+
+	private void onCopyCrashLog(ListItem<?> item){
+		if(!crashLogFile.exists()) return;
+		try(InputStream is=new FileInputStream(crashLogFile)){
+			BufferedReader reader=new BufferedReader(new InputStreamReader(is));
+			StringBuilder sb=new StringBuilder();
+			String line;
+			while ((line=reader.readLine())!=null) sb.append(line).append("\n");
+			UiUtils.copyText(list, sb.toString());
+		} catch(IOException e){
+			Log.e(TAG, "Error reading crash log", e);
+		}
+	}
 }

mastodon/src/main/res/values/strings_sk.xml

@@ -430,4 +430,7 @@
 	<string name="sk_private_note_confirm_delete">Delete personal note about %s?</string>
 	<string name="sk_delete_note">Delete personal note</string>
 	<string name="sk_add_note">Add personal note</string>
-</resources>
+	<string name="sk_settings_copy_crash_log">Copy latest crash log</string>
+	<string name="sk_settings_crash_log_unavailable">None available… yet</string>
+	<string name="sk_crash_log_copied">Crash log copied</string>
+</resources>