Android 如何使导航抽屉中的菜单可单击以打开新活动
我们必须在清单文件中做出一些声明。我试着这么做,但总是出错。我的应用程序正常运行,但在选择菜单项时,我的应用程序停止 AndroidManifest.xmlAndroid 如何使导航抽屉中的菜单可单击以打开新活动,android,android-intent,navigation,android-manifest,navigation-drawer,Android,Android Intent,Navigation,Android Manifest,Navigation Drawer,我们必须在清单文件中做出一些声明。我试着这么做,但总是出错。我的应用程序正常运行,但在选择菜单项时,我的应用程序停止 AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.sachinsharma.nav"> <applic
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sachinsharma.nav">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
NewActivity.java
package com.example.sachinsharma.nav
import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.app.FragmentTransaction;
import android.util.Log;
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;
import static android.R.attr.value;
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);
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) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void displaySelectedScreen(int id){
Fragment fragment = null;
switch(id) {
case R.id.nav_dashboard:
fragment = new FragDashboard();
break;
case R.id.nav_attendance:
fragment = new FragAttendance();
break;
// case R.id.nav_homework:
// break;
// case R.id.nav_exams:
// break;
// case R.id.nav_fee:
// break;
// case R.id.nav_notifications:
// break;
// case R.id.nav_tracking:
// break;
// case R.id.nav_profile:
// break;
}
if(fragment != null){
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.content_main, fragment);
ft.commit();
//this transaction does not replace layouts completely, it just overlaps and the rest
//of content_main layout can still be seen
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
displaySelectedScreen(id);
return true;
}
}
package com.example.sachinsharma.nav;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.annotation.Nullable;
/**
* Created by sachinsharma on 4/4/17.
*/
public class NewActivity extends MainActivity{
@Override
public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
super.onCreate(savedInstanceState, persistentState);
}
}
以下是我抽屉里的菜单项
action_main_drawer.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/nav_dashboard"
android:icon="@mipmap/ic_dashboard_black_24dp"
android:title="Dashboard" />
<item
android:id="@+id/nav_attendance"
android:icon="@mipmap/ic_watch_later_black_24dp"
android:title="Attendance" />
<item
android:id="@+id/nav_homework"
android:icon="@mipmap/ic_announcement_black_24dp"
android:title="Homework" />
<item
android:id="@+id/nav_exams"
android:icon="@mipmap/ic_assignment_black_24dp"
android:title="Exams" />
<item
android:id="@+id/nav_fee"
android:icon="@drawable/rupee"
android:title="Fee" />
<item
android:id="@+id/nav_notifications"
android:icon="@mipmap/ic_notifications_active_black_24dp"
android:title="Notifications" />
<item
android:id="@+id/nav_tracking"
android:icon="@mipmap/ic_directions_bus_black_24dp"
android:title="Tracking" />
<item
android:id="@+id/nav_profile"
android:icon="@mipmap/ic_account_circle_black_24dp"
android:title="Profile" />
</menu>
问题是你应该使用片段。您所做的是打开另一个没有导航抽屉的活动,
事实上,每个活动只能有一个导航抽屉,但每个活动有多个片段,每个活动不能有多个活动
尝试使用片段,一切都会很好。在一个应用程序中有大量的活动会使它变得滞后,用户很可能会删除你的应用程序
更多信息请告诉我,对于代码,只需在android studio中创建新项目,然后选择导航抽屉活动,然后创建您的项目。阅读代码,您将了解片段的概念
祝你好运
在AndroidManifest.xml
不要忘记为NewActivity
应用主题AppTheme.NoActionBar
更新您的AndroidMenifest.xml
如下:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sachinsharma.nav">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".NewActivity"
android:theme="@style/AppTheme.NoActionBar">
</activity>
</application>
</manifest>
希望这会有所帮助~请帮我解决这个问题。因为我是android新手。您能发布错误日志吗?如果您使用的是NavigationDrawer,我建议您使用片段并将其删除。这里有一个链接供参考:我试过这么做,但我的应用程序在选择菜单时不断崩溃。知道为什么会这样吗?我用片段更新了我的代码,但是现在菜单的布局超过了现有的布局,而且还不完全。请检查MainActivity.java代码。如果你需要更多的细节,请询问。我使用片段更新了我的代码,但是现在菜单的布局超过了现有的布局,这也不完全。请检查MainActivity.java,nav_dashboard.xml有一个带有文本仪表板的文本视图,它一直与启动程序活动的元素一起出现,而不是完全替换它们。我认为您没有创建带有导航的演示项目。在mainActivityXML文件中,将包含内容xml文件,用于替换不同的片段