Initial commit for better handling of background crashes

app/build.gradle

@@ -227,6 +227,7 @@ dependencies {
     implementation 'androidx.fragment:fragment-ktx:1.6.2'
     implementation "androidx.lifecycle:lifecycle-livedata-ktx:${androidxLifecycleVersion}"
     implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:${androidxLifecycleVersion}"
+    implementation "androidx.lifecycle:lifecycle-process:${androidxLifecycleVersion}"
     implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.1.0'
     implementation 'androidx.media:media:1.7.0'
     implementation 'androidx.preference:preference:1.2.1'

app/src/main/java/org/schabi/newpipe/error/AppLifecycleObserver.kt

@@ -0,0 +1,32 @@
+package org.schabi.newpipe.error
+
+import android.util.Log
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import java.util.concurrent.atomic.AtomicLong
+
+object AppLifecycleObserver : DefaultLifecycleObserver {
+    private var isInBackground = false
+    private val lastBackgroundTimestamp = AtomicLong(0)
+    private var TAG = javaClass.simpleName
+
+    override fun onStart(owner: LifecycleOwner) {
+        isInBackground = false
+        Log.d(TAG, "App moved to foreground")
+    }
+
+    override fun onStop(owner: LifecycleOwner) {
+        isInBackground = true
+        lastBackgroundTimestamp.set(System.currentTimeMillis())
+        Log.d(TAG, "App moved to background")
+    }
+
+    fun isAppInBackground(): Boolean = isInBackground
+
+    /**
+     * @return the elapsed time since the app moved to the background or 0 if it is in foreground
+     */
+    fun getTimeSinceLastBackground(): Long {
+        return if (isInBackground) System.currentTimeMillis() - lastBackgroundTimestamp.get() else 0
+    }
+}

app/src/main/java/org/schabi/newpipe/error/ErrorUtil.kt

@@ -35,13 +35,20 @@ class ErrorUtil {
          * activity (since the workflow would be interrupted anyway in that case). So never use this
          * for background services.
          *
+         * If this method is called while the app has been in the background for more than
+         * 10 seconds it will not start an error activity and instead create a notification
+         *
          * @param context the context to use to start the new activity
          * @param errorInfo the error info to be reported
          */
         @JvmStatic
         fun openActivity(context: Context, errorInfo: ErrorInfo) {
+            if (AppLifecycleObserver.getTimeSinceLastBackground() > 10000) {
+                createNotification(context, errorInfo)
+            } else {
                 context.startActivity(getErrorActivityIntent(context, errorInfo))
             }
+        }
 
         /**
          * Show a bottom snackbar to the user, with a report button that opens the error activity.

app/src/main/java/org/schabi/newpipe/fragments/MainFragment.java

@@ -28,6 +28,7 @@ import androidx.appcompat.app.ActionBar;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentStatePagerAdapterMenuWorkaround;
+import androidx.lifecycle.ProcessLifecycleOwner;
 import androidx.preference.PreferenceManager;
 import androidx.viewpager.widget.ViewPager;
 
@@ -36,6 +37,7 @@ import com.google.android.material.tabs.TabLayout;
 import org.schabi.newpipe.BaseFragment;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.databinding.FragmentMainBinding;
+import org.schabi.newpipe.error.AppLifecycleObserver;
 import org.schabi.newpipe.error.ErrorUtil;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.local.playlist.LocalPlaylistFragment;
@@ -71,6 +73,7 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
     @Override
     public void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        ProcessLifecycleOwner.get().getLifecycle().addObserver(AppLifecycleObserver.INSTANCE);
         setHasOptionsMenu(true);
         tabsManager = TabsManager.getManager(activity);
         tabsManager.setSavedTabsListener(() -> {