MYLIST

蓝
红
绿色

当我在OnItemLongClickListener()上制作Green时，我的列表应如下所示：

MYLIST

绿色

我尝试的是

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);

            }
        });
    }
});

它工作正常，如果我想要清除ListView，但在我的情况下我不想要，我试图添加项目或删除：

adapter.addAll("Something");

或

lv.removeViewAt(2);

然后调用adapter.notifyDataSetChanged();，但每次尝试时都会出现相同的错误。

我做错了什么？

修改

现在代码如下：

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();

            }
        });
    }
});

这就是LogCat错误：

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)

它指向的地方 - ＆gt; adapter.addAll(FileBackup.getNameFile());但它不是null我也试过adapter.addAll("RED");

EDIT2

我正在尝试将名称保留为FileBackup.getFilesFound()，因此我可以再次创建我的适配器，我正在这样做：

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

然后我在做：

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

我的班级被声明为String[]，错误是：

java.lang.ClassCastException：java.lang.String无法强制转换为java.lang.String []

EDIT3

每次我想要更新列表时都会给出相同的错误... @ Y.S。说最好发布我的所有代码以查看发生了什么，因为某处我正在使用String[]代替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;
    }

这就是我拥有文件列表的方式。

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);


     }
 });

我尝试过这样的事情：

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);


    }
});

这就是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)

指向哪里

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

我也试过

adapter.addAll(FileBackup.getFilesFound());

但是它给出了同样的错误......也许是我在一个不正确的地方做这件事......

Answer 1

看看这个答案： ArrayAdapter

所以基本上就像在这个答案中说的那样：＆＃34; ArrayAdapter在被数组初始化时，将数组转换为一个无法修改的AbstractList（List）。＆＃34;

所以很容易，创建自己的ArrayList，在你的String类型的情况下，然后将它分配给CustomAdapter，然后你可以从ArrayList中删除项目，notifyDataSetChanged（）应该工作。

此致

无法修改ListView

MYLIST

MYLIST

修改

EDIT2

EDIT3

1 个答案: