Java 带有NavigationDrawer的片段中的TabHost
嗯,我正在尝试在Java 带有NavigationDrawer的片段中的TabHost,java,android,android-fragments,tabs,Java,Android,Android Fragments,Tabs,嗯,我正在尝试在片段中创建一个TabHostFragment,我面临的问题是我无法实现它,因为我已经在使用抽屉导航。我在这里寻找一些答案,但是我没有找到最好的方法。 我正在使用它,但我添加了更多的片段和项目,问题是我试图实现这段代码,但它不起作用。我知道这是可能的,因为googleplay、YouTube、Play Music…所有这些应用程序都有一个抽屉导航,里面有标签。 问题是,我尝试过的所有方法之一就是创建一个TabHostFragment适配器,如答案示例所示,然后在执行此操作时: p
片段
中创建一个TabHostFragment
,我面临的问题是我无法实现它,因为我已经在使用抽屉导航。我在这里寻找一些答案,但是我没有找到最好的方法。
我正在使用它,但我添加了更多的片段和项目,问题是我试图实现这段代码,但它不起作用。我知道这是可能的,因为googleplay、YouTube、Play Music…
所有这些应用程序都有一个抽屉导航,里面有标签。
问题是,我尝试过的所有方法之一就是创建一个TabHostFragment适配器,如答案示例所示,然后在执行此操作时:
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Tab1"),
MisOfertasFragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("tab2").setIndicator("Tab2"),
RecomendacionesFragment.class, null);
break;
我不知道这样做是否正确,但我尝试过,在这种情况下,它控制单击导航抽屉的哪个项目,然后当用户单击第一个项目时,它应该显示TabHost
LogCat错误看起来像:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.widget.TabHost$TabSpec android.support.v4.app.FragmentTabHost.newTabSpec(java.lang.String)' on a null object reference
此错误指向的行是:
mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Tab1"),
和在displayView(0)中:
我知道这不是使用FragmentTabHost(在switch案例中实现这一点)的最佳方法,但我也尝试创建一个新类,如答案的exmaple,在这个案例中,它给出了相同的错误
请告诉我我误解了什么或做错了什么,因为我不明白我做错了什么
如果你们需要更多的代码,可以问我,我会尽快发布
编辑
我已经更改了导入,我已经导入了android.app.FragmentManager代码>我改为导入android.support.v4.app.FragmentManager代码>,并且在这组代码中只给出了一个错误:
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit(); //here's the error
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
错误-->错误:(253,37)错误:不兼容的类型:android.app.Fragment无法转换为android.support.v4.app.Fragment
EDIT2
package info.androidhive.slidingmenu;
import info.androidhive.slidingmenu.adapter.NavDrawerListAdapter;
import info.androidhive.slidingmenu.model.NavDrawerItem;
import java.util.ArrayList;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.widget.DrawerLayout;
import android.text.Html;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
public class MainActivity extends FragmentActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// saber si esta abierto
public boolean mDrawerOpened;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
//para ponerlo visible
public MenuItem mi;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));
//AyudaSugerencias
navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1)));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setBackgroundDrawable(new ColorDrawable(0xff1d97dd));
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(
Html.fromHtml("<font color='ffffff'>"
+ mTitle + "</font>"));
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
mDrawerOpened = false;
syncState();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(
Html.fromHtml("<font color='ffffff'>"
+ mDrawerTitle + "</font>"));
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
mDrawerOpened = true;
syncState();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
displayView(position);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Fragment fragment = null;
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
case R.id.ofertasRefresh:
return true;
case R.id.menu_search:
return true;
case R.id.newOffer:
getFragmentManager().beginTransaction().replace(R.id.frame_container, new TipusNouProducte()).commit();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/* *
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
if (mDrawerOpened) { menu.removeItem(R.id.ofertasRefresh);
menu.removeItem(R.id.menu_search);menu.removeItem(R.id.newOffer);}
if (!mDrawerOpened) { menu.add(Menu.NONE, R.id.ofertasRefresh, Menu.NONE, mTitle); }
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
//Fragment fragment = null; ---Removed for test, because if I don't remove this line couldn't execute the app because fragment can not call a FragmentActivity....
FragmentActivity fragment = null;
switch (position) {
case 0:
fragment = new TabHostFragment();
break;
default:
break;
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit(); /// here says that replace android.app.Fragment in FragmentTransaction cannot be applied...
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
EDIT3
private void displayView(int position) {
//Fragment fragment = null; ---Removed for test, because if I don't remove this line couldn't execute the app because fragment can not call a FragmentActivity....
if(position == 0){
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
setContentView(R.layout.tabhost);
mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Mis ofertas"),
MisOfertasFragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("tab2").setIndicator("Recomendaciones"),
RecomendacionesFragment.class, null);
}
else
{
Fragment fragment = null;
switch (position) {
case 1:
fragment = new RecomendacionesFragment();
break;
case 2:
fragment = new LocalizacionFragment();
break;
case 3:
fragment = new ListaProductosFragment();
break;
case 4:
fragment = new ConfiguracionFragment();
break;
case 5:
fragment = new AyudaSugerenciasFragment();
break;
case 6:
fragment = new AyudaSugerencias();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit(); /// here says that replace android.app.Fragment in FragmentTransaction cannot be applied...
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
}
EDIT4日志错误
Process: info.androidhive.slidingmenu, PID: 2495
java.lang.RuntimeException: Unable to start activity ComponentInfo{info.androidhive.slidingmenu/info.androidhive.slidingmenu.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {info.androidhive.slidingmenu/info.androidhive.slidingmenu.TabHostFragment}; have you declared this activity in your AndroidManifest.xml?
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {info.androidhive.slidingmenu/info.androidhive.slidingmenu.TabHostFragment}; have you declared this activity in your AndroidManifest.xml?
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1761)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1485)
at android.app.Activity.startActivityForResult(Activity.java:3736)
at android.app.Activity.startActivityForResult(Activity.java:3697)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:817)
at android.app.Activity.startActivity(Activity.java:4007)
at android.app.Activity.startActivity(Activity.java:3975)
at info.androidhive.slidingmenu.MainActivity.displayView(MainActivity.java:221)
at info.androidhive.slidingmenu.MainActivity.onCreate(MainActivity.java:138)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
你忘了打电话了
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
调用findViewById()
后,立即在displayView()
方法中添加上述内容
编辑:
1.从FragmentActivity
扩展您的main活动
,而不是从活动
扩展
2.确保将您的碎片管理器导入为
import android.support.v4.app.FragmentManager;
import android.support.v4.app.Fragment;
而不是
import android.app.FragmentManager;
import android.app.Fragment;
编辑2:
确保将片段导入为
import android.support.v4.app.FragmentManager;
import android.support.v4.app.Fragment;
而不是
import android.app.FragmentManager;
import android.app.Fragment;
编辑3:
您的displayView()
方法应该是:
private void displayView(int position) {
//Fragment fragment = null; ---Removed for test, because if I don't remove this line couldn't execute the app because fragment can not call a FragmentActivity....
if(position == 0){
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
Intent intent = new Intent(MainActivity.this, TabHostFragment.class);
startActivity(intent);
}
else
{
Fragment fragment = null;
switch (position) {
case 1:
fragment = new RecomendacionesFragment();
break;
case 2:
fragment = new LocalizacionFragment();
break;
case 3:
fragment = new ListaProductosFragment();
break;
case 4:
fragment = new ConfiguracionFragment();
break;
case 5:
fragment = new AyudaSugerenciasFragment();
break;
case 6:
fragment = new AyudaSugerencias();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit(); /// here says that replace android.app.Fragment in FragmentTransaction cannot be applied...
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
}
}
displayView()
方法是否在片段中?这个displayView在我的主活动中,它是一个活动。从你试图做的事情来看,android.widget.TabHost mTabHost=(android.support.v4.app.FragmentTabHost)findViewById(android.R.id.TabHost)代码>你打错了way@KostasDrakonakis:在这种情况下,她的代码根本无法编译,可能会出现编译时错误:)这会给她带来错误..检查她的日志能否尝试在类似问题上帮助我,请我找不到我做错了什么:(请记住:PI在这个NavigationDrawer上面临着严重的问题……你能尽快和我谈谈吗?创建碎片有点问题……谢谢。问题是什么?你能创建一个问题并在这里发布链接吗?