how to check if internal storage file has any data
- by user3720291
public class Save extends Activity {
int levels = 2;
int data_block = 1024;
//char[] data = new char[] {'0', '0'};
String blankval = "0";
String targetval = "0";
String temp;
String tempwrite;
String string = "null";
TextView tex1;
TextView tex2;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.save);
Intent intent = getIntent();
Bundle b = intent.getExtras();
tex1 = (TextView) findViewById(R.id.textView1);
tex2 = (TextView) findViewById(R.id.textView2);
if(b!=null)
{
string =(String) b.get("string");
}
loadprev();
save();
}
public void save()
{
if (string.equals("Blank")) blankval = "1";
if (string.equals("Target")) targetval = "1";
temp = blankval + targetval;
try
{
FileOutputStream fos = openFileOutput("data.gds", MODE_PRIVATE);
fos.write(temp.getBytes());
fos.close();
}
catch (FileNotFoundException e) {e.printStackTrace();}
catch (IOException e) {e.printStackTrace();}
tex1.setText(blankval);
tex2.setText(targetval);
}
public void loadprev()
{
String final_data = "";
try {
FileInputStream fis = openFileInput("data.gds");
InputStreamReader isr = new InputStreamReader(fis);
char[] data = new char[data_block];
int size;
while((size = isr.read(data))>0)
{
String read_data = String.copyValueOf(data, 0, size);
final_data += read_data;
data = new char[data_block];
}
}
catch (FileNotFoundException e) {e.printStackTrace();}
catch (IOException e) {e.printStackTrace();}
char[] tempread = final_data.toCharArray();;
blankval = "" + tempread[0];
targetval = "" + tempread[1];
}
}
After much tinkering i have finally managed to get my save/load function to work, but it does have an error, pretty much i got it to work then i did a fresh reintall deleting data.gds, afterwards the save/load function crashes because the data.gds file has no previous values.
can i use a if statment to check if data.gds has any values in it, if so how do i do it and if not, then what could i use instead?
