Android: Fix some crashes reported via Play Store

android/app/src/cpp/android_progress_callback.cpp

@@ -35,6 +35,7 @@ void AndroidProgressCallback::SetCancellable(bool cancellable)
 
 void AndroidProgressCallback::SetTitle(const char* title)
 {
+  Assert(title);
   JNIEnv* env = AndroidHelpers::GetJNIEnv();
   jstring text_jstr = env->NewStringUTF(title);
   env->CallVoidMethod(m_java_object, m_set_title_method, text_jstr);
@@ -42,6 +43,7 @@ void AndroidProgressCallback::SetTitle(const char* title)
 
 void AndroidProgressCallback::SetStatusText(const char* text)
 {
+  Assert(text);
   JNIEnv* env = AndroidHelpers::GetJNIEnv();
   jstring text_jstr = env->NewStringUTF(text);
   env->CallVoidMethod(m_java_object, m_set_status_text_method, text_jstr);
@@ -85,6 +87,7 @@ void AndroidProgressCallback::DisplayDebugMessage(const char* message)
 
 void AndroidProgressCallback::ModalError(const char* message)
 {
+  Assert(message);
   JNIEnv* env = AndroidHelpers::GetJNIEnv();
   jstring message_jstr = env->NewStringUTF(message);
   env->CallVoidMethod(m_java_object, m_modal_error_method, message_jstr);
@@ -92,6 +95,7 @@ void AndroidProgressCallback::ModalError(const char* message)
 
 bool AndroidProgressCallback::ModalConfirmation(const char* message)
 {
+  Assert(message);
   JNIEnv* env = AndroidHelpers::GetJNIEnv();
   jstring message_jstr = env->NewStringUTF(message);
   return env->CallBooleanMethod(m_java_object, m_modal_confirmation_method, message_jstr);
@@ -99,6 +103,7 @@ bool AndroidProgressCallback::ModalConfirmation(const char* message)
 
 void AndroidProgressCallback::ModalInformation(const char* message)
 {
+  Assert(message);
   JNIEnv* env = AndroidHelpers::GetJNIEnv();
   jstring message_jstr = env->NewStringUTF(message);
   env->CallVoidMethod(m_java_object, m_modal_information_method, message_jstr);

android/app/src/cpp/android_settings_interface.cpp

@@ -96,6 +96,13 @@ float AndroidSettingsInterface::GetFloatValue(const char* section, const char* k
   jstring string_object = reinterpret_cast<jstring>(
     env->CallObjectMethod(m_java_shared_preferences, m_get_string, env->NewStringUTF(GetSettingKey(section, key)),
                           env->NewStringUTF(TinyString::FromFormat("%f", default_value))));
+
+  if (env->ExceptionCheck())
+  {
+    env->ExceptionClear();
+    return default_value;
+  }
+
   if (!string_object)
     return default_value;
 
@@ -111,8 +118,15 @@ float AndroidSettingsInterface::GetFloatValue(const char* section, const char* k
 bool AndroidSettingsInterface::GetBoolValue(const char* section, const char* key, bool default_value /*= false*/)
 {
   JNIEnv* env = AndroidHelpers::GetJNIEnv();
-  return static_cast<bool>(env->CallBooleanMethod(m_java_shared_preferences, m_get_boolean,
+  jboolean bool_value = static_cast<bool>(env->CallBooleanMethod(m_java_shared_preferences, m_get_boolean,
                                                   env->NewStringUTF(GetSettingKey(section, key)), default_value));
+  if (env->ExceptionCheck())
+  {
+    env->ExceptionClear();
+    return default_value;
+  }
+
+  return bool_value;
 }
 
 std::string AndroidSettingsInterface::GetStringValue(const char* section, const char* key,
@@ -122,6 +136,16 @@ std::string AndroidSettingsInterface::GetStringValue(const char* section, const
   jobject string_object =
     env->CallObjectMethod(m_java_shared_preferences, m_get_string, env->NewStringUTF(GetSettingKey(section, key)),
                           env->NewStringUTF(default_value));
+
+  if (env->ExceptionCheck())
+  {
+    env->ExceptionClear();
+    return default_value;
+  }
+
+  if (!string_object)
+    return default_value;
+
   return AndroidHelpers::JStringToString(env, reinterpret_cast<jstring>(string_object));
 }
 
@@ -155,10 +179,22 @@ std::vector<std::string> AndroidSettingsInterface::GetStringList(const char* sec
   JNIEnv* env = AndroidHelpers::GetJNIEnv();
   jobject values_set = env->CallObjectMethod(m_java_shared_preferences, m_get_string_set,
                                              env->NewStringUTF(GetSettingKey(section, key)), nullptr);
+  if (env->ExceptionCheck())
+  {
+    env->ExceptionClear();
+    return {};
+  }
+
   if (!values_set)
     return {};
 
   jobjectArray values_array = reinterpret_cast<jobjectArray>(env->CallObjectMethod(values_set, m_set_to_array));
+  if (env->ExceptionCheck())
+  {
+    env->ExceptionClear();
+    return {};
+  }
+  
   if (!values_array)
     return {};
 

android/app/src/main/java/com/github/stenzek/duckstation/AndroidHostInterface.java

@@ -104,4 +104,8 @@ public class AndroidHostInterface {
     static public AndroidHostInterface getInstance() {
         return mInstance;
     }
+
+    static public boolean hasInstanceAndEmulationThreadIsRunning() {
+        return hasInstance() && getInstance().isEmulationThreadRunning();
+    }
 }

android/app/src/main/java/com/github/stenzek/duckstation/EmulationActivity.java

@@ -116,6 +116,16 @@ public class EmulationActivity extends AppCompatActivity implements SurfaceHolde
             mApplySettingsOnSurfaceRestored = true;
     }
 
+    /// Ends the activity if it was restored without properly being created.
+    private boolean checkActivityIsValid() {
+        if (!AndroidHostInterface.hasInstance() || !AndroidHostInterface.getInstance().isEmulationThreadRunning()) {
+            finish();
+            return false;
+        }
+
+        return true;
+    }
+
     @Override
     public void surfaceCreated(SurfaceHolder holder) {
     }
@@ -227,7 +237,9 @@ public class EmulationActivity extends AppCompatActivity implements SurfaceHolde
     @Override
     public void onConfigurationChanged(@NonNull Configuration newConfig) {
         super.onConfigurationChanged(newConfig);
-        updateOrientation(newConfig.orientation);
+
+        if (checkActivityIsValid())
+            updateOrientation(newConfig.orientation);
     }
 
     private void updateOrientation() {

android/app/src/main/java/com/github/stenzek/duckstation/FileUtil.java

@@ -42,6 +42,9 @@ public final class FileUtil {
 
     @SuppressLint("ObsoleteSdkInt")
     private static String getVolumePath(final String volumeId, Context context) {
+        if (volumeId == null)
+            return null;
+
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) return null;
         try {
             StorageManager mStorageManager =
@@ -113,18 +116,26 @@ public final class FileUtil {
 
     @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     private static String getVolumeIdFromUri(final Uri treeUri) {
-        final String docId = DocumentsContract.getDocumentId(treeUri);
-        final String[] split = docId.split(":");
-        if (split.length > 0) return split[0];
-        else return null;
+        try {
+            final String docId = DocumentsContract.getDocumentId(treeUri);
+            final String[] split = docId.split(":");
+            if (split.length > 0) return split[0];
+            else return null;
+        } catch (Exception e) {
+            return null;
+        }
     }
 
 
     @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     private static String getDocumentPathFromUri(final Uri treeUri) {
-        final String docId = DocumentsContract.getDocumentId(treeUri);
-        final String[] split = docId.split(":");
-        if ((split.length >= 2) && (split[1] != null)) return split[1];
-        else return File.separator;
+        try {
+            final String docId = DocumentsContract.getDocumentId(treeUri);
+            final String[] split = docId.split(":");
+            if ((split.length >= 2) && (split[1] != null)) return split[1];
+            else return File.separator;
+        } catch (Exception e) {
+            return null;
+        }
     }
 }

android/app/src/main/java/com/github/stenzek/duckstation/TouchscreenControllerView.java

@@ -143,6 +143,9 @@ public class TouchscreenControllerView extends FrameLayout {
     private boolean handleTouchEvent(MotionEvent event) {
         switch (event.getActionMasked()) {
             case MotionEvent.ACTION_UP: {
+                if (!AndroidHostInterface.hasInstanceAndEmulationThreadIsRunning())
+                    return false;
+
                 for (TouchscreenControllerButtonView buttonView : mButtonViews) {
                     buttonView.setPressed(false);
                 }
@@ -158,6 +161,9 @@ public class TouchscreenControllerView extends FrameLayout {
             case MotionEvent.ACTION_POINTER_DOWN:
             case MotionEvent.ACTION_POINTER_UP:
             case MotionEvent.ACTION_MOVE: {
+                if (!AndroidHostInterface.hasInstanceAndEmulationThreadIsRunning())
+                    return false;
+
                 Rect rect = new Rect();
                 final int pointerCount = event.getPointerCount();
                 final int liftedPointerIndex = (event.getActionMasked() == MotionEvent.ACTION_POINTER_UP) ? event.getActionIndex() : -1;