Number Block Disappears When Placed In Workspace

Activity Code:
package com.thebrokenrail.letscode.app;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import com.google.blockly.android.BlocklyActivityHelper;
import com.google.blockly.android.codegen.CodeGenerationRequest;
import com.google.blockly.android.codegen.LanguageDefinition;
import com.google.blockly.android.control.BlocklyController;
import com.google.blockly.model.BlocklySerializerException;
import com.google.blockly.model.DefaultBlocks;
import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.List;
import static com.thebrokenrail.letscode.app.ProgramsAdapter.EXTRA_MESSAGE;

public class BlocklyEdit extends AppCompatActivity {
    private static final List<String> BLOCK_DEFINITIONS = DefaultBlocks.getAllBlockDefinitions();
    private static final List<String> JAVASCRIPT_GENERATORS = Arrays.asList(
            // Custom block generators go here. Default blocks are already included.
    );

    @NonNull
    protected List<String> getBlockDefinitionsJsonPaths() {
        return BLOCK_DEFINITIONS;
    }

    @NonNull
    protected String getToolboxContentsXmlPath() {
        // Replace with a toolbox that includes application specific blocks.
        return DefaultBlocks.TOOLBOX_PATH;
    }

    @NonNull
    protected List<String> getGeneratorsJsPaths() {
        return JAVASCRIPT_GENERATORS;
    }

    @NonNull
    protected CodeGenerationRequest.CodeGeneratorCallback getCodeGenerationCallback() {
        // Uses the same callback for every generation call.
        return new CodeGenerationRequest.CodeGeneratorCallback() {
            @Override
            public void onFinishCodeGeneration(String generatedCode) {
                Log.d("Blockly", generatedCode);
                Intent intent = new Intent(getApplicationContext(), RunJavascript.class);
                intent.putExtra(EXTRA_MESSAGE, generatedCode);
                startActivity(intent);
            }
        };
    }

    String fileName;
    protected BlocklyActivityHelper mBlocklyActivityHelper;

    public final BlocklyController getController() {
        return mBlocklyActivityHelper.getController();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        getController().onSaveSnapshot(outState);
    }

    @Override
    public void onBackPressed() {
        // Try to close any open drawer / toolbox before backing out of the Activity.
        if (!mBlocklyActivityHelper.onBackToCloseFlyouts()) {
            try {
                mBlocklyActivityHelper.saveWorkspaceToAppDir(fileName);
            } catch (FileNotFoundException | BlocklySerializerException e) {
                e.printStackTrace();
            }
            super.onBackPressed();
        }
    }

    protected BlocklyActivityHelper onCreateActivityHelper() {
        return new BlocklyActivityHelper(this, this.getSupportFragmentManager());
    }

    @Override
    protected void onStart() {
        super.onStart();
        mBlocklyActivityHelper.onStart();
    }

    @Override
    protected void onPause() {
        super.onPause();
        mBlocklyActivityHelper.onPause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        mBlocklyActivityHelper.onResume();
    }

    @Override
    protected void onStop() {
        super.onStop();
        mBlocklyActivityHelper.onStop();
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        mBlocklyActivityHelper.onRestart();
    }

    protected void onLoadInitialWorkspace() {
        onInitWorkspace();
        getController().closeFlyouts();
    }

    protected void onInitWorkspace() {
        mBlocklyActivityHelper.loadWorkspaceFromAppDirSafely(fileName);
    }

    @NonNull
    protected LanguageDefinition getBlockGeneratorLanguage() {
        return DefaultBlocks.LANGUAGE_DEFINITION;
    }

    protected void configureBlockExtensions() {
        mBlocklyActivityHelper.configureExtensions();
    }

    protected void configureMutators() {
        mBlocklyActivityHelper.configureMutators();
    }

    protected void configureCategoryFactories() {
        mBlocklyActivityHelper.configureCategoryFactories();
    }

    protected void onRunCode() {
        mBlocklyActivityHelper.requestCodeGeneration(getBlockGeneratorLanguage(), getBlockDefinitionsJsonPaths(),
                getGeneratorsJsPaths(), getCodeGenerationCallback());
    }

    protected void reloadToolbox() {
        mBlocklyActivityHelper.reloadToolbox(getToolboxContentsXmlPath());
    }

    protected void resetBlockFactory() {
        mBlocklyActivityHelper.resetBlockFactory(getBlockDefinitionsJsonPaths());

        configureBlockExtensions();
        configureMutators();
        configureCategoryFactories();
    }

    protected View onCreateContentView() {
        return getLayoutInflater().inflate(R.layout.blockly_unified_workspace, null);
    }

    protected void onCreateActivityRootView() {
        View content = onCreateContentView();
        if (content != null) {
            FrameLayout contentContainer = findViewById(R.id.content_container);
            FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.MATCH_PARENT);
            if (content.getParent() != contentContainer) {
                contentContainer.addView(content, lp);
            } else {
                content.setLayoutParams(lp);
            }
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_blockly);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        Intent intent = getIntent();
        fileName = intent.getStringExtra(EXTRA_MESSAGE);
        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);

        onCreateActivityRootView();
        mBlocklyActivityHelper = onCreateActivityHelper();
        if (mBlocklyActivityHelper == null) {
            throw new IllegalStateException(
                    "BlocklyActivityHelper is null. " + "onCreateActivityHelper must return a instance.");
        }
        resetBlockFactory(); // Initial load of block definitions, extensions, and mutators.
        configureCategoryFactories(); // After BlockFactory; before Toolbox
        reloadToolbox();
        boolean loadedPriorInstance = getController().onRestoreSnapshot(savedInstanceState);
        if (!loadedPriorInstance) {
            onLoadInitialWorkspace();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_edit, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_save_program: {
                try {
                    mBlocklyActivityHelper.saveWorkspaceToAppDir(fileName);
                } catch (FileNotFoundException | BlocklySerializerException e) {
                    e.printStackTrace();
                }
                return true;
            }
            case R.id.action_run_program: {
                try {
                    mBlocklyActivityHelper.saveWorkspaceToAppDir(fileName);
                } catch (FileNotFoundException | BlocklySerializerException e) {
                    e.printStackTrace();
                }
                onRunCode();
                return true;
            }
            case android.R.id.home: {
                try {
                    mBlocklyActivityHelper.saveWorkspaceToAppDir(fileName);
                } catch (FileNotFoundException | BlocklySerializerException e) {
                    e.printStackTrace();
                }
                return super.onOptionsItemSelected(item);
            }
            default: {
                // If we got here, the user's action was not recognized.
                // Invoke the superclass to handle it.
                return super.onOptionsItemSelected(item);
            }
        }
    }
}
google / blockly-android

Number Block Disappears When Placed In Workspace #733
