導航圖標無法通過單擊

Question

我有一個簡單android.support.v7.widget.Toolbar工作，所有我試圖做的是打開NavigationDrawer按下左上角的「漢堡包」圖標角落。 「漢堡包」按鈕是可見的，當我從左邊開始拉動時，我看到按鈕上的動畫，但按下按鈕並不像我期望的那樣打開/關閉NavigationDrawer。下面的代碼給出： -

MainActivity.java

public class MainActivity extends AppCompatActivity { 
    private DrawerLayout mDrawerLayout; 
    // private String drawerTitle; 
    NavigationView mNavigationView; 
    FragmentManager mFragmentManager; 
    FragmentTransaction mFragmentTransaction; 

    Button sign_in; 

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

     setToolbar(); 

     mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
     sign_in = (Button) findViewById(R.id.sign_in); 
     mNavigationView = (NavigationView) findViewById(R.id.nav_view); 

     if (mNavigationView != null) { 
      setupDrawerContent(mNavigationView); 
     } 

     mFragmentManager = getSupportFragmentManager(); 
     mFragmentTransaction = mFragmentManager.beginTransaction(); 
     mFragmentTransaction.replace(R.id.main_content, new HomeFragment()).commit(); 

//  drawerTitle = getResources().getString(R.string.home_item); 
//  if (savedInstanceState == null) { 
//   selectItem(drawerTitle); 
//  } 

     sign_in.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent signin = new Intent(MainActivity.this, LoginActivity.class); 
       startActivity(signin); 
      } 
     }); 

    } 

    private void setToolbar() { 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     final ActionBar ab = getSupportActionBar(); 
     if (ab != null) { 
      ab.setHomeAsUpIndicator(R.drawable.ic_menu); 
      ab.setDisplayHomeAsUpEnabled(true); 
     } 

    } 



    private void setupDrawerContent(NavigationView navigationView) { 
     navigationView.setNavigationItemSelectedListener(
       new NavigationView.OnNavigationItemSelectedListener() { 

        @Override 
        public boolean onNavigationItemSelected(MenuItem menuItem) { 
         menuItem.setChecked(true); 
         if (menuItem.getItemId() == R.id.nav_home) { 
          FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction(); 
          fragmentTransaction.replace(R.id.main_content, new HomeFragment()).commit(); 
          mDrawerLayout.closeDrawers(); 

         } 

         if (menuItem.getItemId() == R.id.nav_training) { 
          FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
          xfragmentTransaction.replace(R.id.main_content, new TrainingFragment()).commit(); 
          mDrawerLayout.closeDrawers(); 
         } 

         if (menuItem.getItemId() == R.id.nav_product) { 
          FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
          xfragmentTransaction.replace(R.id.main_content, new ProductFragment()).commit(); 
          mDrawerLayout.closeDrawers(); 
         } 

//      if (menuItem.getItemId() == R.id.nav_product_details) { 
//       FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction(); 
//       fragmentTransaction.replace(R.id.main_content, new ProductDetailsFragment()).commit(); 
//       mDrawerLayout.closeDrawers(); 
// 
//      } 

         if (menuItem.getItemId() == R.id.nav_my_cart) { 
          FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
          xfragmentTransaction.replace(R.id.main_content, new MyCartFragment()).commit(); 
          mDrawerLayout.closeDrawers(); 
         } 

         if (menuItem.getItemId() == R.id.nav_my_account) { 
          FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
          xfragmentTransaction.replace(R.id.main_content, new MyAccountFragment()).commit(); 
          mDrawerLayout.closeDrawers(); 
         } 

         if (menuItem.getItemId() == R.id.nav_log_out) { 
//       FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
//       xfragmentTransaction.replace(R.id.main_content, new HomeFragment()).commit(); 
//       mDrawerLayout.closeDrawers(); 
          finish(); 
         } 

//      if (menuItem.getItemId() == R.id.nav_log_in) { 
//       FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
//       xfragmentTransaction.replace(R.id.main_content, new LoginFragment()).commit(); 
//       mDrawerLayout.closeDrawers(); 
//      } 
         return false; 
        } 
       } 
     ); 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     if (!mDrawerLayout.isDrawerOpen(GravityCompat.START)) { 
      getMenuInflater().inflate(R.menu.main, menu); 
      return true; 
     } 
     return super.onCreateOptionsMenu(menu); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case R.id.action_about_us: 
       Intent intent = new Intent(MainActivity.this, AboutUs.class); 
       startActivity(intent); 
       return true; 

      case R.id.action_privacy_policy: 
       Intent intent_two = new Intent(MainActivity.this, PrivacyPolicy.class); 
       startActivity(intent_two); 
       return true; 

      case R.id.action_contact_us: 
       Intent intent_three = new Intent(MainActivity.this, ContactUs.class); 
       startActivity(intent_three); 
       return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    private void selectItem(String title) { 
     Bundle args = new Bundle(); 
     args.putString(PlaceholderFragment.ARG_SECTION_TITLE, title); 

     Fragment fragment = PlaceholderFragment.newInstance(title); 
     fragment.setArguments(args); 
     FragmentManager fragmentManager = getSupportFragmentManager(); 
     fragmentManager.beginTransaction().replace(R.id.main_content, fragment).commit(); 

     mDrawerLayout.closeDrawers(); 

     setTitle(title); 

    } 


} 

下面的XML文件中給出： -

activity_main.xml中

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/drawer_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    tools:context=".MainActivity"> 

    <!-- Contenido Principal --> 
    <include layout="@layout/main_content" /> 

    <!-- Menú Deslizante --> 
    <android.support.design.widget.NavigationView 
     android:id="@+id/nav_view" 
     android:layout_width="wrap_content" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     android:fitsSystemWindows="true" 
     app:headerLayout="@layout/nav_header" 
     app:menu="@menu/nav_menu" /> 

</android.support.v4.widget.DrawerLayout> 

Answer 1

此加入您的onCreate方法的結束

mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer); 
    ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.openDrawer, R.string.closeDrawer){ 

     @Override 
     public void onDrawerClosed(View drawerView) { 
      super.onDrawerClosed(drawerView); 
     } 

     @Override 
     public void onDrawerOpened(View drawerView) { 
      super.onDrawerOpened(drawerView); 
     } 
    }; 
    mDrawerLayout.setDrawerListener(actionBarDrawerToggle); 
    actionBarDrawerToggle.syncState();