抽屜式導航欄的多項活動

你好，我是新來的機器人。我想實現由一系列項目組成的導航抽屜，點擊後會打開一個新的活動。基本上是所有活動的導航抽屜。當我從導航抽屜中選擇一個項目時，特定活動將打開，但導航抽屜（漢堡包圖標）的圖標消失。我如何獲得？抽屜式導航欄的多項活動

NavBaseActivity.java

package app.pal.study.samplestudy; 

import android.content.Intent; 
import android.os.Bundle; 
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; 
import android.widget.FrameLayout; 

public class NavBaseActivity extends AppCompatActivity 
    implements NavigationView.OnNavigationItemSelectedListener { 
private DrawerLayout drawer; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_nav_base); 

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    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(); 
    } 
    // getActionBar().setDisplayHomeAsUpEnabled(true); 
    //getActionBar().setHomeButtonEnabled(true); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.nav_base, 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);*/ 
    switch (item.getItemId()) { 
     case android.R.id.home: 
      drawer.openDrawer(GravityCompat.START); 
      return true; 
    } 

    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.item_home) { 
     // Handle the camera action 
     startActivity(new Intent(this, Home.class)); 

    } else if (id == R.id.item_syllabus) { 
     startActivity(new Intent(this, Syllabus.class)); 


    } else if (id == R.id.item_study_time) { 
     startActivity(new Intent(this, StudyTime.class)); 


    } else if (id == R.id.item_exam) { 
     startActivity(new Intent(this, Exam.class)); 


    } else if (id == R.id.item_calendar) { 
     startActivity(new Intent(this, Calendar.class)); 


    } else if (id == R.id.nav_scribble) { 
     startActivity(new Intent(this, Scribble.class)); 


    } 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    drawer.closeDrawer(GravityCompat.START); 
    return true; 
} 
// `onPostCreate` called when activity start-up is complete after `onStart()` 
// NOTE! Make sure to override the method with only a single `Bundle` argument 
@Override 
protected void onPostCreate(Bundle savedInstanceState) { 
    super.onPostCreate(savedInstanceState); 
}

}

Syllabus.java

package app.pal.study.samplestudy; 

import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.NavigationView; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.View; 

public class Syllabus extends NavBaseActivity implements   NavigationView.OnNavigationItemSelectedListener { 

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

}

activity_nav_base.xml

<?xml version="1.0" encoding="utf-8"?> 
<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:openDrawer="start"> 

<include 
    layout="@layout/app_bar_nav_base" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" /> 

<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_nav_base" 
    app:menu="@menu/activity_nav_base_drawer" /> 

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

來源

2016-03-18 PersianBlue