如何设置ArrayList<custom>将数据输入到另一个扩展 listView 的片段中的 ListView? [英] How to set the ArrayList&lt;custom&gt; data in to the ListView in another fragment which extends listView?

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本文介绍了如何设置ArrayList<custom>将数据输入到另一个扩展 listView 的片段中的 ListView?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

如何将ArrayList数据设置到另一个继承listView的fragment中的ListView中?

How to set the ArrayList data in to the ListView in another fragment which extends listView?

非常感谢各位专家的帮助.

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这个 ArrayList.当用户重新进入时，它应该继续将其添加到ArrayList中.

Custom ArrayList takes int, string, string. I get the user input from two EditText's and add them to this ArrayList. When user re-enters, it should keep adding it to the ArrayList.

目标是获取用户的所有条目并将其显示在下一个片段的 ListView 中.但是只有将ArrayList 中的两个String 转换为String 数组，才能用作ArrayAdapter 的数据源.所以重写类日记中的 toSting 方法.我可以在 sysout 时看到 ArrayList 中的值.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.

Objective is to get all the entries from user and show it in a ListView in the next fragment. But only the two Strings from the ArrayList into String array for the use as datasource for ArrayAdapter. So overridden the toSting method in class diarylogs. I can see the value from the ArrayList while sysout. But, once i setListAdapter, the app crashes. Cannot understand what i am doing wrong.

更新

Class MainActivity extends Activity

//Static variable
public static ArrayList<DiaryLogs> test;
public static int Monday=0;

班级日记

public class DiaryLogs {

    String timeEntry, entryEntered;
    int day;

    // single constructor that takes an integer and two string
    public DiaryLogs(int day, String timeEntry, String entryEntered) {
        super();
        this.day = day;
        this.timeEntry = timeEntry;
        this.entryEntered = entryEntered;

    }

    public String getTimeEntry() {
        return timeEntry;
    }

    public void setTimeEntry(String timeEntry) {
        this.timeEntry = timeEntry;
    }

    public String getEntryEntered() {
        return entryEntered;
    }

    public void setEntryEntered(String entryEntered) {
        this.entryEntered = entryEntered;
    }

    public int getDay() {
        return day;
    }

    public void setDay(int day) {
        this.day = day;
    }

    @Override
    public String toString() {

        return timeEntry + "\n" + entryEntered;


    }
}

类 Monday_fragment

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();
    }

}

类 Monday_list_fragment

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

    }

}

布局 XML 文件:monday_list_fragment.xml

<?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>

LOGCAT

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

推荐答案

如果你有一个像 ArrayList 这样的数组，你不需要解压它并提取你想要的字符串并将其添加到另一个数组中，只需将它输入到列表显示.只需覆盖 DiaryLogs 类中的 toString() 方法并使用您选择的字符串返回它(例如 timeEntry & entryEntered).喜欢

If you have an array like ArrayList, you need not to unpack it and extract the string what you wanted and add it to another array just to input it to a listview. Just override the toString() method in your DiaryLogs class and return it with the strings of your choice (e.g. timeEntry & entryEntered). like

// 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));

yourListView 显然是您正在使用的列表视图.

yourListView is obviously the listview that you are using.

这篇关于如何设置ArrayList<custom>将数据输入到另一个扩展 listView 的片段中的 ListView?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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