[英]How to use Android navigation drawer to switch back to the Main Activity
您好,我正在开发一个程序,并使用Android Studio为您提供的Navigation Drawer Activity模板制作了一个Navigation抽屉,这是我的主要活动。 我一直在使用片段在应用程序中的页面之间进行切换,但是我将主Activity定义为抽屉中的选项之一,但是似乎无法弄清楚如何使其回到主Activity中。
这是主要的Activity.java文件(为组织重命名)
package com.eliteapp.eliteapp_indev;
import android.app.FragmentManager;
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.MenuItem;
public class your_cmdrs extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_cmdrs);
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.addDrawerListener(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 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();
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
switch (id){
}
if (id == R.id.GalNet) {
setTitle("GalNet");
galnet GalNat = new galnet();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction(). replace(R.id.Your_CMDRS, GalNat).commit();
} else if (id == R.id.Market) {
setTitle("Market");
market Market = new market();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction(). replace(R.id.Your_CMDRS, Market).commit();
} else if (id == R.id.PowerPlay) {
setTitle("PowerPlay");
powrplay PowrPlay = new powrplay();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction(). replace(R.id.Your_CMDRS, PowrPlay).commit();
} else if (id == R.id.ship_fitting) {
setTitle("Ship Fitting's");
ship_fitting Ship_Fitting = new ship_fitting();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction(). replace(R.id.Your_CMDRS, Ship_Fitting).commit();
} else if (id == R.id.About) {
setTitle("About");
about About = new about();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction(). replace(R.id.Your_CMDRS, About).commit();
} else if (id == R.id.Settings) {
setTitle("Settings");
settings Settings = new settings();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction(). replace(R.id.Your_CMDRS, Settings).commit();
} else if (id == R.id.Change_Log) {
setTitle("Change Log");
change_log Chagne_Log = new change_log();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction(). replace(R.id.Your_CMDRS, Chagne_Log).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
这是content_Main.xml文件
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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/Your_CMDRS"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.eliteapp.eliteapp_indev.your_cmdrs"
tools:showIn="@layout/app_bar_your_cmdrs">
</android.support.constraint.ConstraintLayout>
如果有人可以帮助我,那就太好了。
@ AJok1776我面临同样的问题。
一种解决方案是创建一个与MainActivity相同的MainFragment.java
内容(不包括导航抽屉)默认情况下,加载MainFragment页面。
MainActivity内容是唯一的导航抽屉代码。
然后,当用户单击主页时,将“主页”按钮(或其他按钮)添加到抽屉中,即可重定向MainFragment页面。
希望这个解释对您有帮助:)
编辑:
通过将这段代码添加到main.java文件中的if语句中,我设法使其正常工作。
} else if (id == R.id.Your_CMDRS) {
Intent your_cmdrs = new Intent(this, your_cmdrs.class);
startActivity(your_cmdrs);
现在可以使用了,但是当我切换回活动时会有一个延迟,即使我正在参加主要活动,我什至可以切换到该活动
这是它的视频: https : //youtu.be/lQ93OeZDxIY
我认为这是事实,这是一项活动,而不是碎片,但我不确定。
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