I am trying to save all the items in my ListView to a text file. I am making an item then saving it on this button click.
@Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.addItem:
items.add(new ListViewItem() {{
ThumbnailResource = R.mipmap.ic_launcher;
Title = et.getText().toString();
SubTitle = "Item2 Description";
}});
lv.setAdapter(adapter);
// add-write text into file
try {
fileout = openFileOutput("mytextfile.txt", MODE_PRIVATE);
outputWriter = new OutputStreamWriter(fileout);
outputWriter.write(et.getText().toString());
outputWriter.close();
//display file saved message
Toast.makeText(getBaseContext(), "File saved successfully!",
Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
}
break;
Then When the person exits out of the app and goes back in, this code in on create adds the list item back.
try {
FileInputStream fileIn=openFileInput("mytextfile.txt");
InputStreamReader InputRead= new InputStreamReader(fileIn);
char[] inputBuffer= new char[READ_BLOCK_SIZE];
String start="";
int charRead;
while ((charRead=InputRead.read(inputBuffer))>0) {
// char to string conversion
String readstring=String.copyValueOf(inputBuffer,0,charRead);
start +=readstring;
}
InputRead.close();
final String finalStart = start;
items.add(new ListViewItem() {{
ThumbnailResource = R.mipmap.ic_launcher;
Title = finalStart;
SubTitle = "Item2 Description";
}});
lv.setAdapter(adapter);
Toast.makeText(getBaseContext(), start,Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
}
The problem is it saves only one ListView item at a time. not all of them even though it saves after every button click. How do I get it to save all he items to the txt file. Not just the most recent one?
Thanks.
Here is all my code:
MainActivity:
public class MainActivity extends ActionBarActivity implements
View.OnClickListener{
EditText et;
Button bt;
ListView lv;
List<ListViewItem> items;
CustomListViewAdapter adapter;
FileOutputStream fileout;
OutputStreamWriter outputWriter;
static final int READ_BLOCK_SIZE = 100;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et = (EditText) findViewById(R.id.editText);
bt = (Button) findViewById(R.id.addItem);
bt.setOnClickListener(this);
lv = (ListView) findViewById(R.id.listView);
items = new ArrayList<ListViewItem>();
adapter = new CustomListViewAdapter(this, items);
try {
FileInputStream fileIn=openFileInput("mytextfile.txt");
InputStreamReader InputRead= new InputStreamReader(fileIn);
char[] inputBuffer= new char[READ_BLOCK_SIZE];
String start="";
int charRead;
while ((charRead=InputRead.read(inputBuffer))>0) {
// char to string conversion
String readstring=String.copyValueOf(inputBuffer,0,charRead);
start +=readstring;
}
InputRead.close();
final String finalStart = start;
items.add(new ListViewItem() {{
ThumbnailResource = R.mipmap.ic_launcher;
Title = finalStart;
SubTitle = "Item2 Description";
}});
lv.setAdapter(adapter);
Toast.makeText(getBaseContext(), start,Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
}
lv.setOnItemLongClickListener(new ListView.OnItemLongClickListener() {
// setting onItemLongClickListener and passing the position to the function
@Override
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
removeItemFromList(position);
return true;
}
});
}
@Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.addItem:
items.add(new ListViewItem() {{
ThumbnailResource = R.mipmap.ic_launcher;
Title = et.getText().toString();
SubTitle = "Item2 Description";
}});
lv.setAdapter(adapter);
// add-write text into file
try {
fileout = openFileOutput("mytextfile.txt", MODE_PRIVATE);
outputWriter = new OutputStreamWriter(fileout);
outputWriter.write(et.getText().toString());
outputWriter.close();
//display file saved message
Toast.makeText(getBaseContext(), "File saved successfully!",
Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
}
break;
}
}
class ListViewItem {
public int ThumbnailResource;
public String Title;
public String SubTitle;
}
protected void removeItemFromList(int position) {
final int deletePosition = position;
AlertDialog.Builder alert = new AlertDialog.Builder(
MainActivity.this);
alert.setTitle("Delete");
alert.setMessage("Do you want delete this item?");
alert.setPositiveButton("YES", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TOD O Auto-generated method stub
// main code on after clicking yes
items.remove(deletePosition);
adapter.notifyDataSetChanged();
adapter.notifyDataSetInvalidated();
}
});
alert.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
}
});
alert.show();
}
}
CustomViewAdapter:
public class CustomListViewAdapter extends BaseAdapter {
LayoutInflater inflater;
List<MainActivity.ListViewItem> items;
public CustomListViewAdapter(Activity context, List<MainActivity.ListViewItem> items) {
super();
this.items = items;
this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return items.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
MainActivity.ListViewItem item = items.get(position);
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.item_row, null);
ImageView imgThumbnail = (ImageView) vi.findViewById(R.id.imgThumbnail);
TextView txtTitle = (TextView) vi.findViewById(R.id.txtTitle);
TextView txtSubTitle = (TextView) vi.findViewById(R.id.txtSubTitle);
imgThumbnail.setImageResource(item.ThumbnailResource);
txtTitle.setText(item.Title);
txtSubTitle.setText(item.SubTitle);
return vi;
}
}
Put it in your onStop:
@Override
public void onStop(){
super.onStop();
SharedPreferences.Editor edit = PreferenceManager.getDefaultSharedPreferences(this).edit();
for (int i = 0 ; i < items.size(); i++) {
ListViewItem item = items.get(i);
edit.putString(Integer.toString(i), item.ThumbnailResource + "," + item.Title + "," + item.SubTitle);
}
edit.commit();
To retreive this data add something like that to your onResume():
SharedPreferences myPref = PreferenceManager.getDefaultSharedPreferences(this);
String item = myPref.getString(Integer.toString(0), "empty");
int i = 0;
do {
String[] result = item.split(",");
ListViewItem listItem = new ListViewItem();
listItem.ThumbnailResource = Integer.valueOf(result[0]);
listItem.Title = result[1];
listItem.SubTitle = result[2];
items.add(listItem);
i++;
item = myPref.getString(Integer.toString(i), "empty");
} while (!item.equals("empty"));