此Android代码用于MainActivity，但在我的情况下它不起作用但是从那里我复制它的工作正常，所以请告诉我在哪里弄乱了。
我是Android开发的新手，所以请帮助我。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/Onlinechat"
android:textColor="@android:color/white"
android:textStyle="bold"
android:background="@color/colorPrimary"
android:padding="12dp"
android:gravity="center"
android:textSize="22sp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/Onlinechat"
android:textSize="18sp"
android:textColor="@color/colorAccent"
android:paddingLeft="10dp"
android:paddingRight="10dp"/>
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<fragment
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/fragmentlist"
android:name="es.esy.buddy.com.simplechat.ListOfOnlineMember"
tools:layout="@layout/listviewonlinitems" />
</ScrollView>
</LinearLayout>
片段列表项目的代码，我们要在运行时在片段中显示的位置。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:id="@+id/Listitem1"
android:padding="8dp"
android:layout_height="match_parent">
<ImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:id="@+id/imageviewshow"
android:src="@drawable/wallpaper6"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:text="Tuneer Mahatpure"
android:gravity="start"
android:id="@+id/txtName"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:id="@+id/txtNumber"
android:text="7828743317"
android:gravity="start|bottom"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"/>
</LinearLayout>
</LinearLayout>
片段列表的Java代码，但我想为此目的使用listView，但是我无法在片段java代码中进行Intialise listView，我想知道是否有任何方法可以在Fragment Java Code
中使用ListView package es.esy.buddy.com.simplechat;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SimpleAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
* Created by Tuneer on 07-03-2017.
*/
public class ListOfOnlineMember extends ListFragment {
String[] countries = new String[] {
"India",
"Pakistan",
"Sri Lanka",
"China",
"Bangladesh",
"Nepal",
"Afghanistan",
"North Korea",
"South Korea",
};
// Array of integers points to images stored in /res/drawable/
int[] flags = new int[]{
R.drawable.picture1,
R.drawable.picture2,
R.drawable.picture3,
R.drawable.wallpaper2,
R.drawable.wallpaper3,
R.drawable.wallpaper5,
R.drawable.wallpaper4,
R.drawable.wallpaper6,
R.drawable.wallpaper7,
};
// Array of strings to store currencies
String[] currency = new String[]{
"Indian Rupee",
"Pakistani Rupee",
"Sri Lankan Rupee",
"Renminbi",
"Bangladeshi Taka",
"Nepalese Rupee",
"Afghani",
"North Korean Won",
"South Korean Won",
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Each row in the list stores country name, currency and flag
List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>();
for(int i=0;i<10;i++){
HashMap<String, String> hm = new HashMap<String,String>();
hm.put("txt", countries[i]);
hm.put("cur", currency[i]);
hm.put("flag", Integer.toString(flags[i]) );
aList.add(hm);
}
// Keys used in Hashmap
String[] from = { "flag","txt","cur" };
// Ids of views in listview_layout
int[] to = { R.id.imageviewshow,R.id.txtName,R.id.txtNumber};
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
SimpleAdapter adapter = new SimpleAdapter(getActivity().getBaseContext(), aList, R.layout.listviewonlinitems, from, to);
setListAdapter(adapter);
return super.onCreateView(inflater, container, savedInstanceState);
}
}
#this is Java code for MainActivity.java what i write here is simple code just calling layout to show up but the app is not opening or its suddenly stopped whenever my code goes on this activity.
package es.esy.buddy.com.simplechat;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
/**
* Created by Tuneer on 07-03-2017.
*/
public class OnlineChatMember extends FragmentActivity {
@Override
public void onCreate(Bundle SavedInstanceState){
super.onCreate(SavedInstanceState);
setContentView(R.layout.onlinechatmember);
}
}
#Errors i am getting Errors while opening the app on this activity showing this error but i used carefull with array then why it is showing array errors.
03-09 04:21:27.399 6846-6846/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: es.esy.buddy.com.simplechat, PID: 6846
java.lang.RuntimeException: Unable to start activity ComponentInfo{es.esy.buddy.com.simplechat/es.esy.buddy.com.simplechat.OnlineChatMember}: android.view.InflateException: Binary XML file line #30: Binary XML file line #30: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: android.view.InflateException: Binary XML file line #30: Binary XML file line #30: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #30: Error inflating class fragment
Caused by: java.lang.ArrayIndexOutOfBoundsException: length=9; index=9
at es.esy.buddy.com.simplechat.ListOfOnlineMember.onCreateView(ListOfOnlineMember.java:69)
at android.app.Fragment.performCreateView(Fragment.java:2353)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:959)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1149)
at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1251)
at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2311)
at android.app.FragmentController.onCreateView(FragmentController.java:98)
at android.app.Activity.onCreateView(Activity.java:5884)
at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:36)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:77)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:777)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:414)
at android.app.Activity.setContentView(Activity.java:2414)
at es.esy.buddy.com.simplechat.OnlineChatMember.onCreate(OnlineChatMember.java:17)
at android.app.Activity.performCreate(Activity.java:6662)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
This is it so can u help me
堆栈跟踪状态 Caused by: java.lang.ArrayIndexOutOfBoundsException: length=9; index=9
您正在调用此代码
for(int i=0;i<10;i++){
HashMap<String, String> hm = new HashMap<String,String>();
hm.put("txt", countries[i]);
hm.put("cur", currency[i]);
hm.put("flag", Integer.toString(flags[i]) );
aList.add(hm);
}
您的各个阵列（国家，货币，国旗）有9个要素，但是您显然循环10次，因此您得到了例外。我建议用countries.length替换10
这是超级简单的Java，实际上与提出的问题无关。只需准备好堆栈跟踪就可以将您指向正确的方向。