从数组中检索数据时，我的应用程序出现问题。
SchedulePage：
public class SchedulePage extends Activity {
List<MyTask> tasks;
List<Test_Sched> SchedList;
// Intent intent = getIntent();
// String Username = intent.getStringExtra("Username2");
int Count = 0;
String SendCount = "";
TextView endtv, durationtv;
//storage of Test_Name
private static ArrayList<String> Test_Name = new ArrayList<String>();
//storage of x values in array private
private static ArrayList<Integer> Duration = new ArrayList<Integer>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_schedule_page);
endtv = (TextView) findViewById(R.id.Endtv);
durationtv = (TextView) findViewById(R.id.Durationtv);
//Use this to Create Layouts Dynamically
//RelativeLayout relativeLayout = new RelativeLayout(this);
tasks = new ArrayList<>();
GetSchedule();
//GridView gv = (GridView) findViewById(R.id.grid);
//gv.setAdapter(new ImageAdapter(getApplicationContext()));
//Storing test name Arraylist in a array
final String [] web = Test_Name.toArray(new String[Test_Name.size()]);
//Storing images in a array
ArrayList<Integer> imagesAL = new ArrayList<Integer>();
for(int i = 0; i < Test_Name.size(); i++){
// String testname = web[i];
String lf = "One Leg(Left)", rf = "One Leg(Right)", sf = "Separate Foot", sbsf= "Side By Side Foot", tthr ="Toe To Heel(Right)", tthl ="Toe To Heel(Left)";
if(lf.equals(Test_Name.get(i))){
imagesAL.add(R.drawable.leftfoot);
}
if(rf.equals(Test_Name.get(i))){
imagesAL.add(R.drawable.rightfoot);
}
if(sf.equals(Test_Name.get(i))){
imagesAL.add(R.drawable.feetapart);
}
if(sbsf.equals(Test_Name.get(i))){
imagesAL.add(R.drawable.sidebysidefoot);
}
if(tthr.equals(Test_Name.get(i))){
imagesAL.add(R.drawable.righttoetoleftheel);
}
if(tthl.equals(Test_Name.get(i))){
imagesAL.add(R.drawable.lefttoetorightheel);
}
}
Integer [] imageId = imagesAL.toArray(new Integer[imagesAL.size()]);
ImageAdapter adapter = new ImageAdapter(SchedulePage.this, web, imageId);
GridView grid;
grid=(GridView)findViewById(R.id.grid);
grid.setAdapter(adapter);
grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(SchedulePage.this, "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.schedule_page, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
//Login Stuff
public static ArrayList<Integer> getDuration() {
return Duration;
}
public static ArrayList<String> getTestName() {
return Test_Name;
}
private void GetSchedule(){
String jsonOutput = "http://172.20.34.112/IBBTS_WebService_MobileAndDevice/Service1.asmx/GetSchedule";
if (isOnline()) {
//while(End == "not yet"){
requestData(jsonOutput);
//}
}else {
Toast.makeText(SchedulePage.this, "Network isn't available", Toast.LENGTH_LONG).show();
}
}
private static String doJSONHTTPCall(String urlStr) {
String output2 = "";
try {
URL url;
try {
url = new URL(urlStr);
}
catch (MalformedURLException e) {
throw e;
}
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/json");
BufferedReader br = new BufferedReader(new InputStreamReader(
(conn.getInputStream())));
String output;
while ((output = br.readLine()) != null) {
output2 += output;
}
conn.disconnect();
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
return output2;
}
private void requestData(String uri) {
//Send the integer to String
Bundle gt=getIntent().getExtras();
String usernamePass =gt.getString("userName2");
SendCount = Integer.toString(Count);
RequestPackage p = new RequestPackage();
p.setMethod("GET");
p.setUri(uri);
p.setParam("Username", usernamePass);
MyTask task = new MyTask();
task.execute(p);
}
protected void updateDisplay(){
if (SchedList != null) {
for (Test_Sched test_Sched : SchedList) {
Duration.add(test_Sched.getDuration());
Test_Name.add(test_Sched.getTest_Name());
Count++;
}
}
}
protected boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
} else {
return false;
}
}
private class MyTask extends AsyncTask<RequestPackage, String, String>{
@Override
protected void onPreExecute() {
//updateDisplay("Starting Task");
if (tasks.size() == 0) {
//progress.setVisibility(View.VISIBLE);
}
tasks.add(this);
}
@Override
protected String doInBackground(RequestPackage... params) {
String content = HttpManager.getData(params[0]);
return content;
}
@Override
protected void onPostExecute(String result) {
SchedList = ScheduleJSONParser.parseFeed(result);
updateDisplay();
tasks.remove(this);
if (tasks.size() == 0) {
//progress.setVisibility(View.INVISIBLE);
}
}
@Override
protected void onProgressUpdate(String... values) {
//updateDisplay(values[0]);
}
}
}
ScheduleJSONParsor
public class ScheduleJSONParser {
public static List<Test_Sched> parseFeed(String content) {
try {
JSONArray ar = new JSONArray(content);
List<Test_Sched> SchedList = new ArrayList<>();
for (int i = 0; i < ar.length(); i++) {
JSONObject obj = ar.getJSONObject(i);
Test_Sched test_Sched = new Test_Sched();
test_Sched.setDuration(Integer.parseInt(obj.getString("Duration")));
test_Sched.setTest_Name(obj.getString("Test_Name"));
SchedList.add(test_Sched);
}
return SchedList;
} catch (JSONException e) {
e.printStackTrace();
return null;
}
}}
logcat没有指出哪一行有错误，我发现很难排除故障。 我们的想法是从数据库中检索计划并将其传递给数组。然后，应用程序将显示每个练习名称的图像按钮。
当我从主菜单中单击schedulePage按钮时，它显示为空白，我必须第二次重新单击schedulePage。第二次显示arrayoutofbounds错误..
任何帮助将不胜感激。
答案 0 :(得分：0)
原因是这两行
GetSchedule();
final String [] web = Test_Name.toArray(new String[Test_Name.size()]);
在GetSChedule()中您正在后台运行线程，并且从webservice的响应中您正在填充Test_Name数组。但在调用webservice之前，您正在将Test_Name数据复制到Web阵列，因此您的web []将为空，因为Test_Name中没有数据。
让web[]全球
String [] web;
将其填入updateDisplay()
protected void updateDisplay(){
if (SchedList != null) {
for (Test_Sched test_Sched : SchedList) {
Duration.add(test_Sched.getDuration());
Test_Name.add(test_Sched.getTest_Name());
Count++;
}
web = Test_Name.toArray(new String[Test_Name.size()]);
}
}