解决Android中第二个FloatingActionButton失效的问题

public class FoodActivity extends AppCompatActivity {

    FloatingActionButton mCreateRem;
    RecyclerView mRecyclerview;
    ArrayList<Model> dataholder = new ArrayList<Model>();
    myAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_food);

        mRecyclerview = (RecyclerView) findViewById(R.id.recyclerView_food);
        mRecyclerview.setLayoutManager(new LinearLayoutManager(this)); // 使用 this
        mCreateRem = (FloatingActionButton) findViewById(R.id.create_reminder);

        mCreateRem.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(FoodActivity.this, FoodAddReminder.class); // 使用 FoodActivity.this 或者 this
                startActivity(intent);
            }
        });

        Cursor cursor = new dbManager(this).readallreminders(); // 使用 this
        while (cursor.moveToNext()) {
            Model model = new Model (cursor.getString(1), cursor.getString(2), cursor.getString(3));
            dataholder.add(model);
        }

        adapter = new myAdapter(dataholder);
        mRecyclerview.setAdapter(adapter);
    }

    @Override
    public void onBackPressed() {
        finish();
        super.onBackPressed();
    }
}