如何从导航抽屉中显示片段？

Question

我无法找到使用Android Studio中的特定AUTO生成代码的问题。 我想弄清楚如何显示从导航抽屉中单击按钮时的布局？

这里是产生MainActivity

package com.oxinc.android.classaverage; 

    import android.app.FragmentManager; 
    import android.os.Bundle; 
    import android.support.design.widget.FloatingActionButton; 
    import android.support.design.widget.Snackbar; 
    import android.view.View; 
    import android.support.design.widget.NavigationView; 
    import android.support.v4.view.GravityCompat; 
    import android.support.v4.widget.DrawerLayout; 
    import android.support.v7.app.ActionBarDrawerToggle; 
    import android.support.v7.app.AppCompatActivity; 
    import android.support.v7.widget.Toolbar; 
    import android.view.Menu; 
    import android.view.MenuItem; 

    public class MainActivity extends AppCompatActivity 
      implements NavigationView.OnNavigationItemSelectedListener { 

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

      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(); 
       } 
      }); 

      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); 
     } 

     @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.main, 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_settings) { 
       return true; 
      } 

      return super.onOptionsItemSelected(item); 
     } 

     @SuppressWarnings("StatementWithEmptyBody") 
     @Override 
     public boolean onNavigationItemSelected(MenuItem item) { 
      // Handle navigation view item clicks here. 
      int id = item.getItemId(); 

//This is the part I am having trouble with 

      if (id == R.id.nav_camera) { 
       // Handle the camera action 
      } else if (id == R.id.nav_gallery) { 

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


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

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

      } else if (id == R.id.nav_send) { 
       //This is what I have come up with 
       setContentView(R.layout.MyLayout) 
      } 

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

预先感谢您。

Answer 1

要显示您至少已经newd的一个片段！请执行next.Let你的android studio默认类继承FragmentActivity，相应地改变它们，或者你可以跳过this.Put一个FrameLayout在你的根视图里，其实内容是放（android工作室为你创建，默认情况下与抽屉），并不要让一个实例，该FrameLayout.Create类让我说MyFragmenNumberOne.class，并让它继承FRAGMENT，并确保使用V4作为定位支持旧的WEEL。之后，您只需从fragmentManager中调用patter代码，以添加/移除/替换将传递片段类和容器框架布局实例的片段。非常重要的是，在调用beginTransaction.replace（）时，第一个参数将不会查看你的容器，但它的资源ID像R.id.myContainer和第二个争论ment是片段的实例，可以用new关键字直接初始化，或者在片段类中有一个静态newInstance（）方法，它将创建一个实例并在应用程序生命周期中使用它，这是更好的练习。无论如何我都会帮助你。