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从 SharedPreferences 填充 ListView

更新时间:2023-01-06 12:44:47

所以我找到了解决方案,我第一次使用 ArrayList 迭代器使它变得过于复杂.

So I found the solution, I made it overcomplicated first time round with the ArrayList Iterator.

该解决方案现在基本上从 AlertDialogListView 添加手动条目,条目存储在 ArrayList listItems 中.

The solution now basically adds manual entries to the ListView from an AlertDialog, entries are stored in an ArrayList listItems.

更新源代码:

public class ManageLinguisticPhrases extends ListActivity 
{

    private static final String PHRASE = "Phrase_";

    private String prefName = "myPhrasesStorage";
    private SharedPreferences prefs;     

    private ArrayList <String> listItems = new ArrayList <String>();         
    private  List<String> phrasesCollection = new LinkedList<String>();

    private String phraseText = "test";            
    private static int count = 0;

    private ArrayAdapter <String> adapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        adapter = new ArrayAdapter <String> (this, android.R.layout.simple_list_item_1, listItems);        
        setListAdapter(adapter);      

        prefs = this.getSharedPreferences(prefName, MODE_PRIVATE);

        for(int i = 0; i <= prefs.getAll().size(); i++) {    
            phrasesCollection.add(i, prefs.getString(PHRASE + i, "Ola, Tudo bem?"));            
        }          

        listItems.addAll(phrasesCollection);
        adapter.notifyDataSetChanged();         

    }


    @Override
    protected Dialog onCreateDialog(int id) 
    {

        final EditText input = new EditText(this);

        switch (id) 
        {
        case 0:
            return new AlertDialog.Builder(this)
            .setIcon(R.drawable.ic_launcher)
            .setTitle("Please enter the new data")
            .setView(input)
            .setPositiveButton("Save", new DialogInterface.OnClickListener() 
            {    
                public void onClick(DialogInterface dialog,    int whichButton)
                {                                            
                    phraseText = input.getText().toString();
                    listItems.add(phraseText);   

                    adapter.notifyDataSetChanged();                                        

                    prefs = getSharedPreferences(prefName, MODE_PRIVATE);
                    SharedPreferences.Editor editor = prefs.edit();                    

                    //save new phrase in myPhrasesStorage with key "Phrase_[count]"                
                    editor.putString(PHRASE + count + "", phraseText);
                    count++;

                    editor.commit();

                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() 
            {
                public void onClick(DialogInterface dialog,    int whichButton)
                {


                }
        })        

                .create();
        }
        return null;
    }

    private void CreateMenu(Menu menu)
    {
        MenuItem mnu1 = menu.add(0, 0, 0, "Add data");
        {
            mnu1.setAlphabeticShortcut('a');
            mnu1.setIcon(android.R.drawable.ic_menu_add);
        }
        MenuItem mnu2 = menu.add(0, 1, 1, "Edit data");
        {
            mnu2.setAlphabeticShortcut('b');
            mnu2.setIcon(android.R.drawable.ic_menu_edit);
        }
        MenuItem mnu3 = menu.add(0, 2, 2, "Clear ALL data");
        {
            mnu3.setAlphabeticShortcut('c');
            mnu3.setIcon(android.R.drawable.ic_menu_delete);
        }

    }

    private boolean MenuChoice(MenuItem item)
    {
        switch (item.getItemId()) 
        {
            case 0:

                showDialog(0);

            return true;

            case 2:

                prefs = getSharedPreferences(prefName, MODE_PRIVATE);
                SharedPreferences.Editor editor = prefs.edit();        

                editor.clear();
                editor.commit();

                listItems.clear();
                adapter.notifyDataSetChanged();

                Toast.makeText(this, "All phrases deleted",
                        Toast.LENGTH_LONG).show();

            return true;
        }
        return false;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
    {
        super.onCreateOptionsMenu(menu);
        CreateMenu(menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        return MenuChoice(item);
    }        
}

享受吧!