我有一个文件应该从我的MySQL数据库中提取产品列表，将它们编码为JSON数组，然后我需要让Android应用程序显示它们。
理想情况下，我希望它能够显示图标，但是我现在可以修改一下，我只是想让它工作
单击按钮时使用下面的当前代码，它不会执行任何操作。我的LogCat显示我的JSON非常好，但应用程序没有显示任何内容或崩溃。
public class GetProducts extends Activity {
//Delcare Variables
// JSON Response node names
private static String KEY_SUCCESS = "success";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.view_products);
Functions userFunctions = new Functions();
if(!userFunctions.isConnected(getApplicationContext()))
{
displayDialogue("Connection Error","Your network settings are invalid - please turn on network settings ", "Open Network Settings");
}
if(!userFunctions.isUserLoggedIn(getApplicationContext())){
Intent i = new Intent(GetProducts.this, FirstScreen.class);
startActivity(i);
}
Button btnLogin;
btnLogin = (Button)findViewById(R.id.btnGetProducts);
//When our login button is pressed
btnLogin.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
new LoginTask().execute();
}
});
//Assign the variables our layout buttons
}
//We are using an AsyncTask so that this function runs on a seperate thread of the processor
//Since 4.2 + Android requires any web or HTTP activity to be ran seperate thread to the GUI
class LoginTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
//Run the login function
Login();
return null;
}
}
public void displayDialogue(String title, String Message, String Button){
final AlertDialog.Builder myDialogue = new AlertDialog.Builder(this);
myDialogue.setTitle(title);
myDialogue.setMessage(Message);
TextView messageView = new TextView(this);
messageView.setGravity(Gravity.CENTER);
myDialogue.setView(messageView);
myDialogue.setCancelable(false);
myDialogue.setPositiveButton(Button, new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog dialog = myDialogue.create();
dialog.show();
}
public void Login(){
try{
Functions userFunctions = new Functions();
final JSONObject json = userFunctions.getProducts();
JSONObject json_user = json.getJSONObject("products");
JSONArray jArray;
jArray = json.getJSONArray("products");
if (json.getString("success") != null) {
String res = json.getString("success");
if(Integer.parseInt(res) == 1){
try{
// user successfully logged in
// Store user details in SQLite Database
runOnUiThread(new Runnable() {
@Override
public void run() {
try {
displayDialogue("Error",json.getString("name"), "Try Again");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
// Clear all previous data in database
// Close Login Screen
finish();
}
catch(final Exception e){
runOnUiThread(new Runnable() {
@Override
public void run() {
displayDialogue("Error",e.toString(), "Try Again");
}
});
}
}
else{
runOnUiThread(new Runnable() {
@Override
public void run() {
displayDialogue("Error", "Error. \nWrong username / password combination please re-enter the details", "Try Again");
}
});
}
}else{
runOnUiThread(new Runnable() {
@Override
public void run() {
displayDialogue("Error", "Error. \nGeneric Error", "Try Again");
}
});
}
}
catch(JSONException e){
e.printStackTrace();
}
}
}
JSON结果： - （打印到Logcat）
12-27 16:53:45.011: E/JSON(23028): {"tag":"getProducts","success":1,"error":0,"products":{"name":"Coffee1","price":"4.00","image":"http:\/\/test.com"}}{"tag":"getProducts","success":1,"error":0,"products":{"name":"Coffee2","price":"5.00","image":"http:\/\/test2.com"}}
任何帮助都会很棒，谢谢！