Java 当我单击第一项时，浮动按钮活动未打开

我是新手。。。我在我的应用程序中添加了浮动按钮，并在第一个项目中添加了一键式活动，但当我单击第一个项目时，应用程序不幸停止帮助我

MainActivity.java

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    FloatingActionMenu materialDesignFAM;
    FloatingActionButton floatingActionButton1, floatingActionButton2, floatingActionButton3;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        materialDesignFAM = (FloatingActionMenu) findViewById(R.id.material_design_android_floating_action_menu);
        floatingActionButton1 = (FloatingActionButton) findViewById(R.id.material_design_floating_action_menu_item1);
        floatingActionButton2 = (FloatingActionButton) findViewById(R.id.material_design_floating_action_menu_item2);
        floatingActionButton3 = (FloatingActionButton) findViewById(R.id.material_design_floating_action_menu_item3);
        floatingActionButton1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // first item
                Intent intent = new Intent(MainActivity.this, Menu2.class);
                startActivity(intent);
            }
        });
        floatingActionButton2.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

            }
        });
        floatingActionButton3.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

            }
        });


        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open,
                R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

        //add this line to display menu1 when the activity is loaded
        displaySelectedScreen(R.id.nav_menu1);
    }

---

别忘了将您的活动添加到

AndroidManifest.xml

文件中

添加StackTrace可以添加异常和xml文件吗？请告诉我我是新来的看看这个：好吧。你的onClick（）方法被调用了吗？你能提供给我你的布局吗？我会检查并还原你的布局，你是否为此使用了任何库