导航图标导致应用程序关闭

Question

我是Android Studio的新手，但已经成功走了很远，包括成功登录屏幕。但是我陷入困境。

使用ActionBarDrawerToggle创建的导航图标在主屏幕上正常工作。然后在单击任何选项时，它会成功加载片段。但是，当我再次单击该图标转到另一个片段时，导航抽屉打开但应用程序关闭。调试器没有显示任何错误，它只报告触发了onStop和onPause事件（由于我没有使用它们，所以它们是空的）。

我已经尝试了很多，但我无法找到解决此问题的方法。

我甚至尝试使用自定义ImageButton在ActionBar上创建自定义视图，并设置了一个单击侦听器。这很好，但我想使用默认方法，即ActionBarDrawerToggle。

对所有建议开放！

My HomeAcivity.java，我正在使用我定制的备用。

public class HomeActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {

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

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

    LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View v = inflater.inflate(R.layout.actionbar, null);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(false);
    getSupportActionBar().setDisplayShowHomeEnabled(false);
    getSupportActionBar().setDisplayShowTitleEnabled(false);
    getSupportActionBar().setDisplayShowCustomEnabled(true);
    getSupportActionBar().setCustomView(v);
    ImageButton drawer = (ImageButton) findViewById(R.id.btn1);
    drawer.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
            if (drawer.isDrawerOpen(GravityCompat.START)) {
                drawer.closeDrawer(GravityCompat.START);
            } else {
                drawer.openDrawer(GravityCompat.START);
            }
        }
    });

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

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_logout) {
        SQLiteHandler db = new SQLiteHandler(getApplicationContext());
        SessionManager session = new SessionManager(getApplicationContext());
        db.deleteUsers();
        session.setLogin(false);
        Intent intent = new Intent(HomeActivity.this, LoginActivity.class);
        startActivity(intent);
        finish();
        return true;
    }else if(id == android.R.id.home){
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            drawer.openDrawer(GravityCompat.START);
        }
    }

    return super.onOptionsItemSelected(item);
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();
    if (id == R.id.nav_profile) {
        ProfileFragment profileFragment = new ProfileFragment();
        android.support.v4.app.FragmentManager manager = getSupportFragmentManager();
        manager.beginTransaction().replace(R.id.content_home_fragment, profileFragment, profileFragment.getTag()).commit();

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setTitle(R.string.profile_heading);
    } else if (id == R.id.nav_about) {

    } else if (id == R.id.nav_cmi) {

    } else if (id == R.id.nav_inspire) {

    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

}