Java 如何设置ArrayList<；定制>；在扩展ListView的另一个片段中将数据导入ListView？
如何在扩展ListView的另一个片段中将ArrayList数据设置到ListView中 您的专家将非常感谢您的帮助。 自定义ArrayList接受int、string、string。 我从两个EditText获取用户输入，并将它们添加到此ArrayList。 当用户重新输入时，它应该继续将其添加到ArrayList中 目标是从用户处获取所有条目，并在下一个片段的列表视图中显示。 但只有两个字符串从ArrayList进入字符串数组，用作ArrayAdapter的数据源。 因此重写了类diarylogs中的toSting方法。 我可以在sysout时从ArrayList中看到值。 但是，一旦我设置了ListAdapter，应用程序就会崩溃。无法理解我做错了什么。 更新Java 如何设置ArrayList<；定制>；在扩展ListView的另一个片段中将数据导入ListView？,java,android,listview,android-fragments,arraylist,Java,Android,Listview,Android Fragments,Arraylist,如何在扩展ListView的另一个片段中将ArrayList数据设置到ListView中 您的专家将非常感谢您的帮助。 自定义ArrayList接受int、string、string。 我从两个EditText获取用户输入，并将它们添加到此ArrayList。 当用户重新输入时，它应该继续将其添加到ArrayList中 目标是从用户处获取所有条目，并在下一个片段的列表视图中显示。 但只有两个字符串从ArrayList进入字符串数组，用作ArrayAdapter的数据源。 因此重写了类diaryl
Class MainActivity extends Activity
//Static variable
public static ArrayList<DiaryLogs> test;
public static int Monday=0;
public class Monday_fragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.monday_fragment, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
currentDateTime();
super.onViewCreated(view, savedInstanceState);
}
public void currentDateTime() {
EditText timeText = (EditText) getView().findViewById(
R.id.dateTimeEText);
SimpleDateFormat df = new SimpleDateFormat("d/M/yyyy:H:m");
String dateTime = df.format(Calendar.getInstance().getTime());
timeText.setText(dateTime);
}
@Override
public void onStart() {
Button saveBtn = (Button) getView()
.findViewById(R.id.saveDiaryEntryBtn);
saveBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
EditText timeText = (EditText) getView().findViewById(
R.id.dateTimeEText);
EditText entryText = (EditText) getView().findViewById(
R.id.diaryEntryEText);
String timeEntry = timeText.getText().toString();
String entryEntered = entryText.getText().toString();
MainActivity.test = new ArrayList<DiaryLogs>();
MainActivity.test.add(new DiaryLogs(MainActivity.Monday,
timeEntry, entryEntered));
}
}
);
Button showBtn = (Button) getView().findViewById(
R.id.showDiaryEntriesBtn);
showBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager
.beginTransaction();
Monday_list_fragment mlf = new Monday_list_fragment();
fragmentTransaction.replace(android.R.id.content, mlf);
fragmentTransaction.commit();
}
});
super.onStart();
}
}
public class Monday_list_fragment extends ListFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater
.inflate(R.layout.monday_list_fragment, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
System.out.println(MainActivity.test); //test: if value can be seen
ArrayAdapter<DiaryLogs> arrayAdapter = new ArrayAdapter<DiaryLogs>(
getActivity(),
android.R.layout.simple_list_item_1, MainActivity.test
);
setListAdapter(arrayAdapter); //once i set adapter it crashes
}
}
如果您有一个类似ArrayList的数组，您不需要解压它，提取您想要的字符串，然后将其添加到另一个数组中，只需将其输入listview即可。只需重写DiaryLogs类中的toString（）方法，并返回您选择的字符串（例如timeEntry和EntryEnter）。像
//类日志
二元类日志{
...
@凌驾
公共toString（）{
返回日期时间+“-”+入口名称；
}
...
}
//在你的活动中
ArrayList diaryLogs=新的ArrayList（）；
日记本。新增（新日记本（2014年4月14日第1期，“条目1”）；
日记本。新增（新日记本（1，“2014年4月14日”，“条目2”）；
日记本。新增（新日记本（2014年4月14日第1期，“条目3”）；
setAdapter（新的ArrayAdapter（这个，android.R.layout.simple_list_item_1，diaryLogs））；
您的listview显然就是您正在使用的listview。谢谢。但如果你能详细说明的话。
public class Monday_list_fragment extends ListFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater
.inflate(R.layout.monday_list_fragment, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
System.out.println(MainActivity.test); //test: if value can be seen
ArrayAdapter<DiaryLogs> arrayAdapter = new ArrayAdapter<DiaryLogs>(
getActivity(),
android.R.layout.simple_list_item_1, MainActivity.test
);
setListAdapter(arrayAdapter); //once i set adapter it crashes
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@id/android:list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:smoothScrollbar="true" >
</ListView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" >
<Button
android:id="@+id/returnBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/return_mon_Btn"
android:onClick="monClick">
</Button>
</LinearLayout>
</RelativeLayout>
04-11 23:45:53.992: E/AndroidRuntime(10006): FATAL EXCEPTION: main
04-11 23:45:53.992: E/AndroidRuntime(10006): Process: com.example.s0217980_diary, PID: 10006
04-11 23:45:53.992: E/AndroidRuntime(10006): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.s0217980_diary/com.example.s0217980_diary.MainActivity}: android.view.InflateException: Binary XML file line #41: Error inflating class fragment
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.os.Handler.dispatchMessage(Handler.java:102)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.os.Looper.loop(Looper.java:136)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-11 23:45:53.992: E/AndroidRuntime(10006): at java.lang.reflect.Method.invokeNative(Native Method)
04-11 23:45:53.992: E/AndroidRuntime(10006): at java.lang.reflect.Method.invoke(Method.java:515)
04-11 23:45:53.992: E/AndroidRuntime(10006): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-11 23:45:53.992: E/AndroidRuntime(10006): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-11 23:45:53.992: E/AndroidRuntime(10006): at dalvik.system.NativeStart.main(Native Method)
04-11 23:45:53.992: E/AndroidRuntime(10006): Caused by: android.view.InflateException: Binary XML file line #41: Error inflating class fragment
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
04-11 23:45:53.992: E/AndroidRuntime(10006): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.Activity.setContentView(Activity.java:1929)
04-11 23:45:53.992: E/AndroidRuntime(10006): at com.example.s0217980_diary.MainActivity.onCreate(MainActivity.java:52)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.Activity.performCreate(Activity.java:5231)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-11 23:45:53.992: E/AndroidRuntime(10006): ... 11 more
04-11 23:45:53.992: E/AndroidRuntime(10006): Caused by: java.lang.NullPointerException
04-11 23:45:53.992: E/AndroidRuntime(10006): at com.example.s0217980_diary.Monday_list_fragment.onCreate(Monday_list_fragment.java:45)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.Fragment.performCreate(Fragment.java:1678)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:859)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1040)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1142)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.app.Activity.onCreateView(Activity.java:4786)
04-11 23:45:53.992: E/AndroidRuntime(10006): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
04-11 23:45:53.992: E/AndroidRuntime(10006): ... 21 more
04-11 23:48:11.294: D/dalvikvm(10069): GC_FOR_ALLOC freed 71K, 6% free 3267K/3448K, paused 16ms, total 24ms
04-11 23:48:11.364: D/AndroidRuntime(10069): Shutting down VM
04-11 23:48:11.364: W/dalvikvm(10069): threadid=1: thread exiting with uncaught exception (group=0xb0c9db20)
04-11 23:48:11.374: E/AndroidRuntime(10069): FATAL EXCEPTION: main
04-11 23:48:11.374: E/AndroidRuntime(10069): Process: com.example.s0217980_diary, PID: 10069
04-11 23:48:11.374: E/AndroidRuntime(10069): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.s0217980_diary/com.example.s0217980_diary.MainActivity}: android.view.InflateException: Binary XML file line #41: Error inflating class fragment
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.os.Handler.dispatchMessage(Handler.java:102)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.os.Looper.loop(Looper.java:136)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-11 23:48:11.374: E/AndroidRuntime(10069): at java.lang.reflect.Method.invokeNative(Native Method)
04-11 23:48:11.374: E/AndroidRuntime(10069): at java.lang.reflect.Method.invoke(Method.java:515)
04-11 23:48:11.374: E/AndroidRuntime(10069): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-11 23:48:11.374: E/AndroidRuntime(10069): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-11 23:48:11.374: E/AndroidRuntime(10069): at dalvik.system.NativeStart.main(Native Method)
04-11 23:48:11.374: E/AndroidRuntime(10069): Caused by: android.view.InflateException: Binary XML file line #41: Error inflating class fragment
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
04-11 23:48:11.374: E/AndroidRuntime(10069): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.Activity.setContentView(Activity.java:1929)
04-11 23:48:11.374: E/AndroidRuntime(10069): at com.example.s0217980_diary.MainActivity.onCreate(MainActivity.java:52)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.Activity.performCreate(Activity.java:5231)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-11 23:48:11.374: E/AndroidRuntime(10069): ... 11 more
04-11 23:48:11.374: E/AndroidRuntime(10069): Caused by: java.lang.NullPointerException
04-11 23:48:11.374: E/AndroidRuntime(10069): at com.example.s0217980_diary.Monday_list_fragment.onCreate(Monday_list_fragment.java:45)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.Fragment.performCreate(Fragment.java:1678)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:859)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1040)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1142)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.app.Activity.onCreateView(Activity.java:4786)
04-11 23:48:11.374: E/AndroidRuntime(10069): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
04-11 23:48:11.374: E/AndroidRuntime(10069): ... 21 more
// class DiaryLogs
class DiaryLogs {
...
@Override
public toString() {
return dateTime + " - " + entryName;
}
...
}
// in your activity
ArrayList<DiaryLogs> diaryLogs = new ArrayList<DiaryLogs>();
diaryLogs.add(new DiaryLogs(1, "Apr. 14, 2014", "Entry 1"));
diaryLogs.add(new DiaryLogs(1, "Apr. 14, 2014", "Entry 2"));
diaryLogs.add(new DiaryLogs(1, "Apr. 14, 2014", "Entry 3"));
yourListView.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, diaryLogs));