Java 通过ArrayList<;字符串>;android中从活动到片段
我已经处理一个问题有一段时间了,现在我似乎无法理解,我正在尝试将Java 通过ArrayList<;字符串>;android中从活动到片段,java,android,arraylist,Java,Android,Arraylist,我已经处理一个问题有一段时间了,现在我似乎无法理解,我正在尝试将ArrayList从一个活动传递到一个片段,但是,当我运行代码时,我得到以下堆栈跟踪 03-30 19:26:38.465 28955-28955/org.tcnjteamandroid.cryptochat E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: org.tcnjteamandroid.cryptochat, PID: 28955 java.lang.Ru
ArrayList
从一个活动传递到一个片段,但是,当我运行代码时,我得到以下堆栈跟踪
03-30 19:26:38.465 28955-28955/org.tcnjteamandroid.cryptochat E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: org.tcnjteamandroid.cryptochat, PID: 28955
java.lang.RuntimeException: Unable to start activity ComponentInfo{org.tcnjteamandroid.cryptochat/org.tcnjteamandroid.cryptochat.drawer}: android.view.InflateException: Binary XML file line #24: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2299)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2361)
at android.app.ActivityThread.access$800(ActivityThread.java:145)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1279)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5240)
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.view.InflateException: Binary XML file line #24: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:228)
at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102)
at org.tcnjteamandroid.cryptochat.drawer.onCreate(drawer.java:53)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2252)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2361)
at android.app.ActivityThread.access$800(ActivityThread.java:145)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1279)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5240)
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: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.ArrayList android.os.Bundle.getStringArrayList(java.lang.String)' on a null object reference
at org.tcnjteamandroid.cryptochat.NavigationDrawerFragment.onCreateView(NavigationDrawerFragment.java:96)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:920)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1206)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2159)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:297)
at android.support.v7.app.ActionBarActivity.onCreateView(ActionBarActivity.java:547)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:228)
at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102)
at org.tcnjteamandroid.cryptochat.drawer.onCreate(drawer.java:53)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2252)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2361)
at android.app.ActivityThread.access$800(ActivityThread.java:145)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1279)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5240)
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)
我用来传递和获取此信息的代码如下:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawer);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
ArrayList<String> menuItems = new ArrayList<String>();
menuItems.add("Test");
Bundle bundle = new Bundle();
bundle.putStringArrayList("edttext", menuItems);
/* set Fragmentclass Arguments */
NavigationDrawerFragment fragobj = new NavigationDrawerFragment();
fragobj.setArguments(bundle);
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
@覆盖
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u抽屉);
mNavigationDrawerFragment=(导航DrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation\u抽屉);
mTitle=getTitle();
ArrayList menuItems=新建ArrayList();
菜单项添加(“测试”);
Bundle=新Bundle();
bundle.putStringArrayList(“edttext”,menuItems);
/*设置Fragmentclass参数*/
NavigationDrawerFragment fragobj=新的NavigationDrawerFragment();
fragobj.setArguments(bundle);
//把抽屉摆好。
mNavigationDrawerFragment.setUp(
R.id.navigation\u抽屉,
(抽屉布局)findViewById(R.id.抽屉布局);
}
我用来获取新参数的代码是:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ArrayList<String> strtext = getArguments().getStringArrayList("edttext");
mDrawerListView = (ListView) inflater.inflate(
R.layout.fragment_navigation_drawer, container, false);
mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
});
mDrawerListView.setAdapter(new ArrayAdapter<String>(
getActionBar().getThemedContext(),
android.R.layout.simple_list_item_activated_1,
android.R.id.text1,
strtext));
mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
return mDrawerListView;
}
@覆盖
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
ArrayList strtext=getArguments().getStringArrayList(“edttext”);
mDrawerListView=(ListView)充气器。充气(
R.layout.fragment_导航_抽屉、容器、假);
mDrawerListView.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父对象、视图、整型位置、长id){
选择项目(位置);
}
});
mDrawerListView.setAdapter(新阵列适配器)(
getActionBar().getThemedContext(),
android.R.layout.simple\u list\u item\u activated\u 1,
android.R.id.text1,
strtext);
mDrawerListView.setItemChecked(mCurrentSelectedPosition,true);
返回mDrawerListView;
}
如果我能得到任何帮助,我将不胜感激 可以使用具有静态ArrayList属性的类
public class Values
{
public static ArrayList<String> myArrayList;
}
公共类值
{
公共静态ArrayList myArrayList;
}
在活动中:
ArrayList<String> menuItems = new ArrayList<String>();
Values.myArrayList = menuItems;
ArrayList menuItems=new ArrayList();
Values.myArrayList=menuItems;
在片段中
ArrayList<String> strtext = Values.myArrayAdapter;
ArrayList strtext=Values.myArrayAdapter;
似乎getArguments()。getStringArrayList(“edttext”)
返回null。也许你读/写的时候用错键了?可能您忘了设置它了?从堆栈跟踪中,我们需要查看您的R.layout.activity\u抽屉。我已经检查过,这不是问题所在,键是edttext,并且在每个实例中都正确使用。返回null的是getArguments()
。创建fragobj
并使用fragobj.setArguments(bundle)设置参数代码>但是你从来没有使用过fragobj
,所以无论Fragment
试图getArguments()
的是什么,它都不是你setArguments()
所使用的。我更改了它,现在使用的是创建的片段,但是,我仍然无法让片段拾取参数,我不断尝试在空对象引用上调用虚拟方法“java.util.ArrayList android.os.Bundle.getStringArrayList(java.lang.String)”