我正在使用google place api并希望获取最近的餐厅和咖啡馆但是当我使用进度条获取该数据时出现一个错误
class LoadPlaces extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage(Html.fromHtml("<b>Search</b><br/>Loading Places..."));
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting Places JSON
* */
protected String doInBackground(String... args) {
// creating Places class object
googlePlaces = new GooglePlaces();
try {
// Separeate your place types by PIPE symbol "|"
// If you want all types places make it as null
// Check list of types supported by google
//
String types = "cafe|restaurant"; // Listing places only cafes, restaurants
// Radius in meters - increase this value if you don't find any places
double radius = 1000; // 1000 meters
// get nearest places
nearPlaces = googlePlaces.search(gps.getLatitude(),
gps.getLongitude(), radius, types);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
if(pDialog != null)
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed Places into LISTVIEW
* */
// Get json response status
String status = nearPlaces.status;
// Check for all possible status
if(status.equals("OK")){
// Successfully got places details
if (nearPlaces.results != null) {
// loop through each place
for (Place p : nearPlaces.results) {
HashMap<String, String> map = new HashMap<String, String>();
// Place reference won't display in listview - it will be hidden
// Place reference is used to get "place full details"
map.put(KEY_REFERENCE, p.reference);
// Place name
map.put(KEY_NAME, p.name);
// adding HashMap to ArrayList
placesListItems.add(map);
}
// list adapter
ListAdapter adapter = new SimpleAdapter(MainActivity.this, placesListItems,
R.layout.list_item,
new String[] { KEY_REFERENCE, KEY_NAME}, new int[] {
R.id.reference, R.id.name });
// Adding data into listview
lv.setAdapter(adapter);
}
}
else if(status.equals("ZERO_RESULTS")){
// Zero results found
alert.showAlertDialog(MainActivity.this, "Near Places",
"Sorry no places found. Try to change the types of places",
false);
}
else if(status.equals("UNKNOWN_ERROR"))
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry unknown error occured.",
false);
}
else if(status.equals("OVER_QUERY_LIMIT"))
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry query limit to google places is reached",
false);
}
else if(status.equals("REQUEST_DENIED"))
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry error occured. Request is denied",
false);
}
else if(status.equals("INVALID_REQUEST"))
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry error occured. Invalid Request",
false);
}
else
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry error occured.",
false);
}
}
});
}
并且GooglePlaces类的搜索方法是
public PlacesList search(double latitude, double longitude, double radius, String types)
throws Exception {
this._latitude = latitude;
this._longitude = longitude;
this._radius = radius;
try {
HttpRequestFactory httpRequestFactory = createRequestFactory(HTTP_TRANSPORT);
HttpRequest request = httpRequestFactory
.buildGetRequest(new GenericUrl(PLACES_SEARCH_URL));
request.getUrl().put("key", API_KEY);
request.getUrl().put("location", _latitude + "," + _longitude);
request.getUrl().put("radius", _radius); // in meters
request.getUrl().put("sensor", "false");
if(types != null)
request.getUrl().put("types", types);
PlacesList list = request.execute().parseAs(PlacesList.class);
// Check log cat for places response status
Log.d("Places Status", "" + list.status);
return list;
} catch (HttpResponseException e) {
Log.e("Error:", e.getMessage());
return null;
}
}
我已经使用了许可
但是我在logcat中遇到错误
08-14 22:29:59.867: E/AndroidRuntime(331): FATAL EXCEPTION: AsyncTask #1
08-14 22:29:59.867: E/AndroidRuntime(331): java.lang.RuntimeException: An error occured while executing doInBackground()
08-14 22:29:59.867: E/AndroidRuntime(331): at android.os.AsyncTask$3.done(AsyncTask.java:200)
08-14 22:29:59.867: E/AndroidRuntime(331): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-14 22:29:59.867: E/AndroidRuntime(331): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-14 22:29:59.867: E/AndroidRuntime(331): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-14 22:29:59.867: E/AndroidRuntime(331): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-14 22:29:59.867: E/AndroidRuntime(331): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
08-14 22:29:59.867: E/AndroidRuntime(331): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
08-14 22:29:59.867: E/AndroidRuntime(331): at java.lang.Thread.run(Thread.java:1096)
08-14 22:29:59.867: E/AndroidRuntime(331): Caused by: java.lang.NoClassDefFoundError: com.google.common.base.Preconditions
08-14 22:29:59.867: E/AndroidRuntime(331): at com.google.api.client.util.ClassInfo.<init>(ClassInfo.java:164)
08-14 22:29:59.867: E/AndroidRuntime(331): at com.google.api.client.util.ClassInfo.of(ClassInfo.java:92)
08-14 22:29:59.867: E/AndroidRuntime(331): at com.google.api.client.util.GenericData.<init>(GenericData.java:79)
08-14 22:29:59.867: E/AndroidRuntime(331): at com.google.api.client.util.GenericData.<init>(GenericData.java:61)
08-14 22:29:59.867: E/AndroidRuntime(331): at com.google.api.client.http.GenericUrl.<init>(GenericUrl.java:97)
08-14 22:29:59.867: E/AndroidRuntime(331): at com.eheuristic.android.googlemap.GooglePlaces.search(GooglePlaces.java:56)
08-14 22:29:59.867: E/AndroidRuntime(331): at com.eheuristic.android.googlemap.MainActivity$LoadPlaces.doInBackground(MainActivity.java:1 85)
08-14 22:29:59.867: E/AndroidRuntime(331): at com.eheuristic.android.googlemap.MainActivity$LoadPlaces.doInBackground(MainActivity.java:1)
08-14 22:29:59.867: E/AndroidRuntime(331): at android.os.AsyncTask$2.call(AsyncTask.java:185)
08-14 22:29:59.867: E/AndroidRuntime(331): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-14 22:29:59.867: E/AndroidRuntime(331): ... 4 more
08-14 22:29:59.967: W/IInputConnectionWrapper(331): showStatusIcon on inactive InputConnection
08-14 22:30:02.298: E/WindowManager(331): Activity com.eheuristic.android.googlemap.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44f72ff0 that was originally added here
08-14 22:30:02.298: E/WindowManager(331): android.view.WindowLeaked: Activity com.eheuristic.android.googlemap.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44f72ff0 that was originally added here
08-14 22:30:02.298: E/WindowManager(331): at android.view.ViewRoot.<init>(ViewRoot.java:247)
08-14 22:30:02.298: E/WindowManager(331): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
08-14 22:30:02.298: E/WindowManager(331): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
08-14 22:30:02.298: E/WindowManager(331): at android.view.Window$LocalWindowManager.addView(Window.java:424)
08-14 22:30:02.298: E/WindowManager(331): at android.app.Dialog.show(Dialog.java:241)
08-14 22:30:02.298: E/WindowManager(331): at com.eheuristic.android.googlemap.MainActivity$LoadPlaces.onPreExecute(MainActivity.java:164)
08-14 22:30:02.298: E/WindowManager(331): at android.os.AsyncTask.execute(AsyncTask.java:391)
08-14 22:30:02.298: E/WindowManager(331): at com.eheuristic.android.googlemap.MainActivity.onCreate(MainActivity.java:104)
08-14 22:30:02.298: E/WindowManager(331): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-14 22:30:02.298: E/WindowManager(331): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
08-14 22:30:02.298: E/WindowManager(331): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-14 22:30:02.298: E/WindowManager(331): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-14 22:30:02.298: E/WindowManager(331): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-14 22:30:02.298: E/WindowManager(331): at android.os.Handler.dispatchMessage(Handler.java:99)
08-14 22:30:02.298: E/WindowManager(331): at android.os.Looper.loop(Looper.java:123)
08-14 22:30:02.298: E/WindowManager(331): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-14 22:30:02.298: E/WindowManager(331): at java.lang.reflect.Method.invokeNative(Native Method)
08-14 22:30:02.298: E/WindowManager(331): at java.lang.reflect.Method.invoke(Method.java:521)
08-14 22:30:02.298: E/WindowManager(331): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-14 22:30:02.298: E/WindowManager(331): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-14 22:30:02.298: E/WindowManager(331): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：52)
您正在泄漏对话框。您需要在异步任务的onPostExecute（）方法中调用pDialog.dismiss();。你也应该放......
if(pDialog != null)
pDialog.dismiss();
在主线程上的活动的onPause（）方法中。这将确保窗口不会泄露，即使您的应用程序在执行某些后台执行时丢失了前景。你应该有这样的东西......
public class Login extends Activity implements View.OnClickListener{
ProgressDialog pd;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.login);
pd = null;
}
@Override
public void onPause(){
super.onPause();
if(pd != null)
pd.dismiss();
}
public void onClick(View v){
new SendTask().execute("");
}
/*
No networking allowed on the main thread.
*/
private class SendTask extends AsyncTask<String,String,String>{
int result;
@Override
protected void onPreExecute(){
pd = ProgressDialog.show(Login.this,"","Retrieving Inbox...", true,false);
}
@Override
protected String doInBackground(String...strings){
//do networking here
result = account.prepare();
return null;
}
@Override
protected void onPostExecute(String unused){
//check result
pd.dismiss();
Intent intent = new Intent(Login.this,NextActivity.class);
finish();
startActivity(intent);
}
}
}
答案 1 :(得分：4)
您正在尝试在退出屏幕后显示对话框窗口。
答案 2 :(得分：2)
在onStop中使用它---＆gt;
@Override
protected void onStop() {
super.onStop();
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
答案 3 :(得分：1)
你必须在活动被销毁之前解雇对话
try {
String sql = "SELECT Module_Title as 'Module Title', Assignment_One as 'Ass 1',Assignment_Two as 'Ass 2', Cat_One as 'Cat 1',Cat_Two as 'Cat 2',Course_Work as 'CW', Final_Exam as 'FE', SUM(Total) as 'Total marks' FROM ace_result_register arr WHERE arr.Registration_No= '" + this.Rsltsrch_txtfld.getText() + "'";
this.pst = this.conn.prepareStatement(sql);
this.rs = this.pst.executeQuery();
if (this.rstl_tbl2.getRowCount() >= 0 && this.rstl_tbl2.getRowCount() < 1000) {
this.rstl_tbl2.setModel(DbUtils.resultSetToTableModel((ResultSet)this.rs));
this.rstl_tbl2.setBorder(BorderFactory.createLineBorder(Color.GRAY, 1));
this.rstl_tbl2.getTableHeader().setBorder(BorderFactory.createLineBorder(Color.GRAY, 1));
this.jScrollPane3.setBorder(BorderFactory.createEmptyBorder());
this.jScrollPane3.setPreferredSize(new Dimension(900, 18 + this.rstl_tbl2.getRowCount() * this.rstl_tbl2.getRowHeight()));
DefaultTableCellRenderer centerRenderer = new DefaultTableCellRenderer();
centerRenderer.setHorizontalAlignment(0);
this.rstl_tbl2.getColumn("Module Title").setCellRenderer(centerRenderer);
this.rstl_tbl2.getColumn("Ass 1").setCellRenderer(centerRenderer);
this.rstl_tbl2.getColumn("Ass 2").setCellRenderer(centerRenderer);
this.rstl_tbl2.getColumn("Cat 1").setCellRenderer(centerRenderer);
this.rstl_tbl2.getColumn("Cat 2").setCellRenderer(centerRenderer);
this.rstl_tbl2.getColumn("CW").setCellRenderer(centerRenderer);
this.rstl_tbl2.getColumn("FE").setCellRenderer(centerRenderer);
this.rstl_tbl2.getColumn("Total").setCellRenderer(centerRenderer);
this.rstl_tbl2.getColumnModel().getColumn(0).setCellRenderer(new TextAreaCellRenderer());
}
}
catch (SQLException e) {
JOptionPane.showMessageDialog(null, e);
}
答案 4 :(得分：0)
只需在IsNetworkAvailable（）函数中调用Asynctask ...就像......
if(isNetworkAvailable()) {
AsyncTask_WebAPI asyncTask = new AsyncTask_WebAPI(this, strURL, this);
asyncTask.execute();
}else
{
Toast.makeText(this,"Please Check internet Connectivity",Toast.LENGTH_LONG).show();
}
IsNetworkAvailable（）函数
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager
= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
答案 5 :(得分：0)
当您调用一个方法或活动两次时会发生此错误，请检查您的代码，因为您只需调用一次。
if(pDialog != null){
pDialog.dismiss();
}