无法在ListView中修改值 [英] Unable to modify values in ListView

问题描述

我面对这个问题。

java.lang.UnsupportedOperationException

java.lang.UnsupportedOperationException

我想要做的是容易的，我会告诉你一个例​​子。

What I want to do is easy, I'll show you an example.

蓝
结果红
结果绿

Blue
Red
Green

当我提出一个 OnItemLongClickListener（）例如在绿色，我的名单应该是这样的：

When I make an OnItemLongClickListener() for example on Green, my list should looks like :

绿色

我已经试过是

final ArrayAdapter < String > adapter = new ArrayAdapter < String > (getActivity(), android.R.layout.simple_list_item_1, FileBackup.getFilesFound());
adapter.setNotifyOnChange(true);
lv.setAdapter(adapter);
lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

    @Override
    public boolean onItemLongClick(AdapterView <? > arg0, View arg1, final int arg2, long arg3) {
        String itemValue = (String) lv.getItemAtPosition(arg2);
        Log.d("Item clicked --> ", lv.getItemAtPosition(arg2).toString());
        FileBackup.setNameFile(itemValue);
        final Dialog dialog = new Dialog(getActivity());
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.user_file_choose);
        Button button = (Button) dialog.findViewById(R.id.btOk);
        Button button2 = (Button) dialog.findViewById(R.id.btKo);
        TextView tvBackUpFile = (TextView) dialog.findViewById(R.id.textViewContentDialog);
        tvBackUpFile.setText("Do you want to backup " + FileBackup.getNameFile() + " ?");
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                dialog.dismiss();
                //Clear all the ListView
                lv.setAdapter(null);

            }
        });
    }
});

它的正常工作，如果我想清除的ListView ，但在我来说，我不想，我试图添加项目或删除：

It's working fine, if I want to clear the ListView, but in my case I DON'T WANT TO, I tried to add item or remove with :

adapter.addAll("Something");

或

lv.removeViewAt(2);

然后调用 adapter.notifyDataSetChanged（）; ，但它给出了同样的错误，每次我试图以

And then call adapter.notifyDataSetChanged(); but it gives the same error every time I try to.

我在做什么错了？

现在的code如下：

final ArrayAdapter < String > adapter = new ArrayAdapter < String > (getActivity(), Arrays.asList(FileBackup.getFilesFound()));
adapter.setNotifyOnChange(true);
lv.setAdapter(adapter);
lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

    @Override
    public boolean onItemLongClick(AdapterView <? > arg0, View arg1, final int arg2, long arg3) {
        String itemValue = (String) lv.getItemAtPosition(arg2);
        Log.d("Item clicked --> ", lv.getItemAtPosition(arg2).toString());
        FileBackup.setNameFile(itemValue);
        final Dialog dialog = new Dialog(getActivity());
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.user_file_choose);
        Button button = (Button) dialog.findViewById(R.id.btOk);
        Button button2 = (Button) dialog.findViewById(R.id.btKo);
        TextView tvBackUpFile = (TextView) dialog.findViewById(R.id.textViewContentDialog);
        tvBackUpFile.setText("Do you want to backup " + FileBackup.getNameFile() + " ?");
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                dialog.dismiss();
                //Clear all the ListView
                lv.setAdapter(null);
                //Trying to add that current item clicked
                adapter.addAll(FileBackup.getNameFile());
                adapter.notifyDataSetChanged();

            }
        });
    }
});

这是LogCat中的错误：

And this is the LogCat error :

06-10 20:14:43.531    8072-8072/info.androidhive.tabsswipe E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: info.androidhive.tabsswipe, PID: 8072
java.lang.UnsupportedOperationException
        at java.util.AbstractList.add(AbstractList.java:404)
        at java.util.AbstractList.add(AbstractList.java:425)
        at java.util.Collections.addAll(Collections.java:2583)
        at android.widget.ArrayAdapter.addAll(ArrayAdapter.java:211)
        at info.androidhive.tabsswipe.BackupWA$1$1.onClick(BackupWA.java:80)
        at android.view.View.performClick(View.java:4456)
        at android.view.View$PerformClick.run(View.java:18462)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5102)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
        at dalvik.system.NativeStart.main(Native Method)

，但它不是空我也试图适配器;> adapter.addAll（FileBackup.getNameFile（）） -

当它指向这一点。的addAll（RED）;

我试图让我点击到什么名字FileBackup.getFilesFound（）这样我就可以重新创建我的适配器，我有这样做：

I'm trying to keep the name what I've clicked to FileBackup.getFilesFound() so I can create my adapter again I'm doing it with :

String[] itemvalues = (String[]) lv.getItemAtPosition(arg2);
FileBackup.setFilesFound(itemvalues);

然后我做的：

 adapter.addAll(Arrays.asList(FileBackup.getFilesFound()));
 //Add the name
 adapter.notifyDataSetChanged();

在我的类被声明为的String [] 和错误是：

On my class is declared as String[] and the error is :

java.lang.ClassCastException：java.lang.String中不能转换为java.lang.String []

java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.String[]

它给了同样的错误我想更新列表... @ Y.S每次。说，这是更好地后我所有的code，看看发生了什么事情，因为地方我使用的String [] 而不是的ArrayList＆LT ;弦乐＆GT;

EDIT3

It's giving the same error every time I want to update the list... @Y.S. said that It's better to post all of my code to see what's going on, because somewhere I'm using String[] instead of ArrayList<String>

这是我的 FileBackup.java

    public class FileBackup {

    private String path;
    private String pathFile;
    private File FileToBackUp;
    private String SDpath;
    private String[] FilesFound;
    private String nameFile;

    public String getPathFile() {
        return pathFile;
    }

    public void setPathFile(String pathFile) {
        this.pathFile = pathFile;
    }
    public String getNameFile() {
        return nameFile;
    }

    public void setNameFile(String nameFile) {
        this.nameFile = nameFile;
    }

    public FileBackup(String path){
        this.path = path;
    }

    public File getFileToBackUp() {
        return FileToBackUp;
    }

    public void setFileToBackUp(File fileToBackUp) {
        FileToBackUp = fileToBackUp;
    }
public String[] getFilesFound() {
       this.FilesFound = FilesFound();

        return FilesFound;
    }
 public String[] FilesFound() {
        File dir = new File(this.path);
        File[] filelist = dir.listFiles();
        String[] theNamesOfFiles = new String[filelist.length];
        for (int i = 0; i < theNamesOfFiles.length; i++) {

            theNamesOfFiles[i] = filelist[i].getName();
        }

        return theNamesOfFiles;
    }

这是我怎么有文件的列表。

And this is how I have the List of the files.

final String itemValue = (String) lv.getItemAtPosition(arg2);

 Log.d("Item clicked --> ", lv.getItemAtPosition(arg2).toString());


 final Dialog dialog = new Dialog(getActivity());
 dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
 dialog.setContentView(R.layout.user_file_choose);
 Button button = (Button) dialog.findViewById(R.id.btOk);
 Button button2 = (Button) dialog.findViewById(R.id.btKo);
 FileBackup.setNameFile(itemValue);
 TextView tvBackUpFile = (TextView) dialog.findViewById(R.id.textViewContentDialog);
 tvBackUpFile.setText("Do you want to backup " + FileBackup.getNameFile() + " ?");
 button.setOnClickListener(new View.OnClickListener() {
     public void onClick(View v) {
         //The complete path of the fail
         FileBackup.setPathFile(GlobalConstant.path + "/" + FileBackup.getNameFile());
         //Converting the path of the file to a File and putting it to FileToBackUp
         FileBackup.setFileToBackUp(PathToFile(FileBackup.getPathFile()));

         dialog.dismiss();
         //Clear all the ListView
         lv.setAdapter(null);

         //Add the name
         BackUpFile.setEnabled(true);


     }
 });

我试图做这样的事情：

I tried to do something like :

button.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        //The complete path of the fail
        FileBackup.setPathFile(GlobalConstant.path + "/" + FileBackup.getNameFile());
        //Converting the path of the file to a File and putting it to FileToBackUp
        FileBackup.setFileToBackUp(PathToFile(FileBackup.getPathFile()));
        ///// THIS IS NEW ///////////
        String itemvalues = (String) lv.getItemAtPosition(arg2);
        FileBackup.setFilesFound(new String[] {
            itemvalues
        });
        adapter.addAll(FileBackup.getFilesFound());
        //Add the name
        adapter.notifyDataSetChanged();
        //////////TIL HERE/////////////
        dialog.dismiss();
        //Clear all the ListView


        //Add the name
        BackUpFile.setEnabled(true);


    }
});

这是LogCat中

And this is the LogCat

 java.lang.UnsupportedOperationException
        at java.util.AbstractList.add(AbstractList.java:404)
        at java.util.AbstractList.add(AbstractList.java:425)
        at java.util.AbstractCollection.addAll(AbstractCollection.java:76)
        at android.widget.ArrayAdapter.addAll(ArrayAdapter.java:195)
        at info.androidhive.tabsswipe.BackupWA$1$1.onClick(BackupWA.java:88)
        at android.view.View.performClick(View.java:4456)
        at android.view.View$PerformClick.run(View.java:18462)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5102)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
        at dalvik.system.NativeStart.main(Native Method)

在哪里指向

adapter.addAll(Arrays.asList(FileBackup.getFilesFound()));

此外，我已经试过

Also I've tried with

adapter.addAll(FileBackup.getFilesFound());

但它给了同样的错误...也许是我在做这在一个不正确的地方...

But it's giving the same error... Maybe is that I'm doing this on a not correct place...

推荐答案

看这样的回答：
<一href=\"http://stackoverflow.com/questions/3200551/unable-to-modify-arrayadapter-in-listview-unsupportedoperationexception\">ArrayAdapter

所以基本上在这个答案说：。一个ArrayAdapter，对数组初始化，转换阵列成AbstractList中（列表），它不能被修改的

So basically as in this answer said: "The ArrayAdapter, on being initialized by an array, converts the array into a AbstractList (List) which cannot be modified."

所以很容易，创建你自己的ArrayList，在您的String类型的情况下，然后分配这CustomAdapter，那么你可以删除您ArrayList和notifyDataSetChanged（项目）应该工作。

So it easy, create your own ArrayList, in your case of type String, and then assign this to CustomAdapter, then you can just remove items from your ArrayList and notifyDataSetChanged() should works.

问候

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