嘿，伙计们，我在安卓系统中的应用程序有问题。我无法在textView上检索数据。。。在我的应用程序中，我有一个ListView和下面的textView。我可以在ListView中获取数据，但在textView中无法获取。
这是我的java类
public class X extends Activity {
public static final String strURL = "url...";
private ListView mainListViewNota ;
private View layoutBtn;
private Product[] Products ;
private ArrayAdapter<Product> listAdapter ;
private ArrayList<Product> ProductList = new ArrayList<Product>();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_nota);
// Find the ListView resource.
x = (ListView) findViewById( R.id.mainListViewNota );
x = (View) findViewById(R.id.x);
// when item is tapped, toggle checked properties of CheckBox and Product.
x.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick( AdapterView<?> parent, View item, int position, long id) {
Product Product = listAdapter.getItem( position );
modificaier(Product.getName(), Product.getPrice(), Product.getQuantity() );
ProductViewHolder viewHolder = (ProductViewHolder) item.getTag();
}
});
refrechList();
}
/** Holds Product data. */
private static class Product {
private String name = "" ;
private String price;
private String quantity;
public Product( String name, String price, String quantity ) {
this.name = name ;
this.price = price ;
this.quantity = quantity ;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPrice(){
return price;
}
public void setPrice(){
this.price = price;
}
public String getQuantity(){
return quantity;
}
public void setQuantity(){
this.quantity = quantity;
}
public String toString() {
return name + price + quantity;
}
}
/** Holds child views for one row. */
private static class ProductViewHolder {
private TextView tnName ;
private TextView tnPrice;
private TextView tnQuant;
public ProductViewHolder( TextView tnName, TextView tnPrice, TextView tnQuant ) {
this.tnName = tnName ;
this.tnPrice = tnPrice ;
this.tnQuant = tnQuant ;
}
public TextView gettnName() {
return tnName;
}
public void settnName(TextView tnName) {
this.tnName = tnName;
}
public TextView gettnPrice() {
return tnPrice;
}
public void settnPrice(TextView tnPrice) {
this.tnPrice = tnPrice;
}
public TextView gettnQuant() {
return tnPrice;
}
public void settnQuant(TextView tnQuant) {
this.tnQuant = tnQuant;
}
}
/** Custom adapter for displaying an array of Product objects. */
private static class ProductArrayAdapter extends ArrayAdapter<Product> {
private LayoutInflater inflater;
public ProductArrayAdapter( Context context, List<Product> ProductList ) {
super( context, R.layout.nota_spinner, R.id.rowTextView, ProductList );
// Cache the LayoutInflate to avoid asking for a new one each time.
inflater = LayoutInflater.from(context) ;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Product to display
final Product Product = (Product) this.getItem( position );
// The child views in each row.
Button btnDel;
Button btnAdd;
TextView tnName ;
TextView tnPrice ;
TextView tnQuant ;
// Create a new row view
if ( convertView == null ) {
convertView = inflater.inflate(R.layout.nota_spinner, null);
// Find the child views.
tnName = (TextView) convertView.findViewById( R.id.rowTextView );
tnName.setTextColor(Color.parseColor("blue"));
tnPrice = (TextView) convertView.findViewById( R.id.rowTextView2 );
tnQuant = (TextView) convertView.findViewById( R.id.rowTextView3 );
btnDel = (Button) convertView.findViewById( R.id.btnDel );
btnAdd = (Button) convertView.findViewById( R.id.btnAdd );
convertView.setTag( new ProductViewHolder(tnName, tnPrice, tnQuant) );
else {
ProductViewHolder viewHolder = (ProductViewHolder) convertView.getTag();
tnName = viewHolder.gettnName() ;
tnPrice = viewHolder.gettnPrice() ;
tnQuant = viewHolder.gettnQuant() ;
}
tnName.setText( Product.getName() );
tnPrice.setText( Product.getPrice());
tnQuant.setText( Product.getQuantity() );
return convertView;
}
}
public Object onRetainNonConfigurationInstance() {
return Products ;
}
void refrechList(){
InputStream is = null;
String result = "";
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("mode","afiseaza"));
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(strURL);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection " + e.toString());
}
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "'n");
}
is.close();
result=sb.toString();
}catch(Exception e){
Log.e("log_tag", "Error converting result " + e.toString());
}
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Product t=new Product(json_data.getString("den_produs").toString(),
json_data.getString("pr").toString() + " lei",
"* " + json_data.getString("cant").toString() + " buc" );
ProductList.add( t);
}
}catch(JSONException e){
Log.e("log_tag", "Error parsing data " + e.toString());
}
listAdapter = new ProductArrayAdapter(this, ProductList);
mainListViewNota.setAdapter( listAdapter );
}
static void modificaier( String den, String pr, String cant){
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("mode","sterge"));
nameValuePairs.add(new BasicNameValuePair("den",den));
nameValuePairs.add(new BasicNameValuePair("pr", pr));
nameValuePairs.add(new BasicNameValuePair("cant",cant));
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(strURL);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
}catch(Exception e){
Log.e("log_tag", "Error in http connection " + e.toString());
}
}
static void adauga( String den, String pr, String cant){
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("mode","adauga"));
nameValuePairs.add(new BasicNameValuePair("den",den));
nameValuePairs.add(new BasicNameValuePair("pr", pr));
nameValuePairs.add(new BasicNameValuePair("cant",cant));
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(strURL);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
}catch(Exception e){
Log.e("log_tag", "Error in http connection " + e.toString());
}
}
static void sterge( ){
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("mode","sterge"));
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(strURL);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
}catch(Exception e){
Log.e("log_tag", "Error in http connection " + e.toString());
}
}
static void sterge_tot( ){
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("mode","sterge_tot"));
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(strURL);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
}catch(Exception e){
Log.e("log_tag", "Error in http connection " + e.toString());
}
}
static void afiseaza_total(){
InputStream is = null ;
String result = "";
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(strUrl);
ArrayList<NameValuePair> param = new ArrayList<NameValuePair>();
try {
httpPost.setEntity(new UrlEncodedFormEntity(param));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
//read content
is = httpEntity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection "+e.toString());
}
try {
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = "";
while((line=br.readLine())!=null)
{
sb.append(line+"'n");
}
is.close();
result=sb.toString();
} catch (Exception e) {
// TODO: handle exception
Log.e("log_tag", "Error converting result "+e.toString());
}
}
protected void onPostExecute(Void v) {
// ambil data dari Json database
try {
String result = "";
JSONArray Jarray = new JSONArray(result);
for(int i=0;i<Jarray.length();i++)
{
JSONObject Jasonobject = null;
TextView tvTotal = (TextView)findViewById(R.id.tvTotal);
Jasonobject = Jarray.getJSONObject(i);
//get an output on the screen
String total = Jasonobject.getString("total");
tvTotal.append("Total : " + total);
}
} catch (Exception e) {
// TODO: handle exception
Log.e("log_tag", "Error parsing data "+e.toString());
}
}
}
这是我的php文件
<?php
mysql_connect("localhost","root","");
mysql_select_db("retailer");
$mode =$_REQUEST ['mode'] ;
switch($mode )
{
case "afiseaza":
$sql=mysql_query("SELECT ... it's ok");
while($row=mysql_fetch_assoc($sql))
$output[]=$row;
print(json_encode($output));
break;
case "sterge":
$request = ("delete from ... ok);
mysql_query($request);
mysql_query($query);
break;
case "adauga":
$query = "INSERT INTO ... ok); ";
mysql_query($query);
mysql_query($boo);
break;
case "sterge_tot":
$query = "delete from ... ok";
mysql_query($query);
break;
case "afiseaza_total": ---- > THIS IT'S NOT WORKING
$sqlString = "SELECT *, SUM( p.price * o.quantity ) As total
FROM o, u, p
WHERE u.id = o.id
AND p.cod_p = o.cod_p
AND u.id = (SELECT MAX( id ) FROM u )
GROUP BY u.id ";
$rs = mysql_query($sqlString);
if($rs){
while($objRs = mysql_fetch_assoc($rs)){
$output[] = $objRs;
}
echo json_encode($output);
}
break;
default:
}
mysql_close();
?>
我搞不清出了什么问题。有什么建议吗？！
您的静态void afiseaza_total（）不包含
nameValuePairs.add(new BasicNameValuePair("mode","afiseaza_total"));