android: onPostExecute 没有在 AsyncTask 上被调用
android: onPostExecute not getting called on AsyncTask
我已经尝试过针对 SO 上发布的类似问题提供的各种解决方案，但没有成功。
从我的 activity RestCus 我调用 FetchDetails :
public class RestCus extends Activity{
public void onCreate(Bundle savedInstanceState) {
new FetchDetails().execute();
super.onCreate(savedInstanceState);
setContentView(R.layout.user_add);
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
HashMap<String, Object> user = new HashMap<String, Object>();
user = db.getSelectedUserDetails();
FetchDetails用于在sqlite数据库中插入数据table:
private class FetchDetails extends AsyncTask<String, String, JSONObject> {
String uid;
@Override
protected void onPreExecute() {
super.onPreExecute();
Intent intent = getIntent();
uid = intent.getStringExtra("user");
}
protected JSONObject doInBackground(String... args) {
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.FetchUser(uid);
return json;
}
protected void onPostExecute(JSONObject json) {
try {
if (json.getString(KEY_SUCCESS) != null) {
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
DatabaseHandler db_fetch = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
db_fetch.selectedUser(json_user.getString(KEY_UID),json_user.getString(KEY_MOBILE),json_user.getString(KEY_USERNAME),json_user.getString(KEY_AREA),json_user.getString(KEY_CITY),json_user.getString(KEY_EMAIL));
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
在调试时我观察到一旦 doInBackground() 完成并且 returns json，程序没有执行 onPostExecute() 而是返回到 RestCus activity 在 setContentView 行。
我在多项活动中使用了 AsyncTask，一切正常。我无法确定我的错误。
完整的logcat如下：
01-15 12:25:29.780: E/SQLiteLog(2818): (1) no such table: user_select
01-15 12:25:29.790: D/AndroidRuntime(2818): Shutting down VM
01-15 12:25:29.790: W/dalvikvm(2818): threadid=1: thread exiting with uncaught exception (group=0xb1d6eb20)
01-15 12:25:29.810: E/AndroidRuntime(2818): FATAL EXCEPTION: main
01-15 12:25:29.810: E/AndroidRuntime(2818): Process: com.example.cresto, PID: 2818
01-15 12:25:29.810: E/AndroidRuntime(2818): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.cresto/com.example.cresto.userToDet}: android.database.sqlite.SQLiteException: no such table: user_select (code 1): , while compiling: SELECT * FROM user_select
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.access0(ActivityThread.java:135)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.os.Handler.dispatchMessage(Handler.java:102)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.os.Looper.loop(Looper.java:136)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.main(ActivityThread.java:5017)
01-15 12:25:29.810: E/AndroidRuntime(2818): at java.lang.reflect.Method.invokeNative(Native Method)
01-15 12:25:29.810: E/AndroidRuntime(2818): at java.lang.reflect.Method.invoke(Method.java:515)
01-15 12:25:29.810: E/AndroidRuntime(2818): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
01-15 12:25:29.810: E/AndroidRuntime(2818): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
01-15 12:25:29.810: E/AndroidRuntime(2818): at dalvik.system.NativeStart.main(Native Method)
01-15 12:25:29.810: E/AndroidRuntime(2818): Caused by: android.database.sqlite.SQLiteException: no such table: user_select (code 1): , while compiling: SELECT * FROM user_select
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1253)
01-15 12:25:29.810: E/AndroidRuntime(2818): at com.example.cresto.library.DatabaseHandleruserLoad.getSelecteduserDetails(DatabaseHandleruserLoad.java:95)
01-15 12:25:29.810: E/AndroidRuntime(2818): at com.example.cresto.userToDet.onCreate(userToDet.java:50)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.Activity.performCreate(Activity.java:5231)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
01-15 12:25:29.810: E/AndroidRuntime(2818): ... 11 more
01-15 12:25:29.940: E/JSON(2818): {"tag":"fetchuser","success":1,"error":0,"user":{"mobile":"5089835","city":"LA","area":"Sector Sigma","uname":"udupy","uid":"udupy.5089","email":"udupy.5089@gmail.com"}}
user_select 是我试图在我的 onPostExecute()
中填充的 sqlite 数据库 table
请在方法 onPostExecute 和 doInBackground 上方添加 @Override 注释。
您的 Sqlite DB 丢失 table.. 修复它，您的 post 执行将 运行
getKey(success) 也可能返回 null。添加带有日志的其他条件
更新：
doInBackground 并行发生，而主线程 (onCreate) 运行ning。因此， db.getSelectedUserDetails() 在 postExecute 被调用之前被调用并且程序崩溃而不给 postExecute 机会 运行 。相反，将 setContentView 之后的代码放在 postExecute.. 即：
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
HashMap<String, Object> user = new HashMap<String, Object>();
user = db.getSelectedUserDetails();
我很确定这是你的问题。
我已经尝试过针对 SO 上发布的类似问题提供的各种解决方案，但没有成功。
从我的 activity RestCus 我调用 FetchDetails :
public class RestCus extends Activity{
public void onCreate(Bundle savedInstanceState) {
new FetchDetails().execute();
super.onCreate(savedInstanceState);
setContentView(R.layout.user_add);
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
HashMap<String, Object> user = new HashMap<String, Object>();
user = db.getSelectedUserDetails();
FetchDetails用于在sqlite数据库中插入数据table:
private class FetchDetails extends AsyncTask<String, String, JSONObject> {
String uid;
@Override
protected void onPreExecute() {
super.onPreExecute();
Intent intent = getIntent();
uid = intent.getStringExtra("user");
}
protected JSONObject doInBackground(String... args) {
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.FetchUser(uid);
return json;
}
protected void onPostExecute(JSONObject json) {
try {
if (json.getString(KEY_SUCCESS) != null) {
String res = json.getString(KEY_SUCCESS);
if(Integer.parseInt(res) == 1){
DatabaseHandler db_fetch = new DatabaseHandler(getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
db_fetch.selectedUser(json_user.getString(KEY_UID),json_user.getString(KEY_MOBILE),json_user.getString(KEY_USERNAME),json_user.getString(KEY_AREA),json_user.getString(KEY_CITY),json_user.getString(KEY_EMAIL));
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
在调试时我观察到一旦 doInBackground() 完成并且 returns json，程序没有执行 onPostExecute() 而是返回到 RestCus activity 在 setContentView 行。
我在多项活动中使用了 AsyncTask，一切正常。我无法确定我的错误。
完整的logcat如下：
01-15 12:25:29.780: E/SQLiteLog(2818): (1) no such table: user_select
01-15 12:25:29.790: D/AndroidRuntime(2818): Shutting down VM
01-15 12:25:29.790: W/dalvikvm(2818): threadid=1: thread exiting with uncaught exception (group=0xb1d6eb20)
01-15 12:25:29.810: E/AndroidRuntime(2818): FATAL EXCEPTION: main
01-15 12:25:29.810: E/AndroidRuntime(2818): Process: com.example.cresto, PID: 2818
01-15 12:25:29.810: E/AndroidRuntime(2818): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.cresto/com.example.cresto.userToDet}: android.database.sqlite.SQLiteException: no such table: user_select (code 1): , while compiling: SELECT * FROM user_select
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.access0(ActivityThread.java:135)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.os.Handler.dispatchMessage(Handler.java:102)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.os.Looper.loop(Looper.java:136)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.main(ActivityThread.java:5017)
01-15 12:25:29.810: E/AndroidRuntime(2818): at java.lang.reflect.Method.invokeNative(Native Method)
01-15 12:25:29.810: E/AndroidRuntime(2818): at java.lang.reflect.Method.invoke(Method.java:515)
01-15 12:25:29.810: E/AndroidRuntime(2818): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
01-15 12:25:29.810: E/AndroidRuntime(2818): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
01-15 12:25:29.810: E/AndroidRuntime(2818): at dalvik.system.NativeStart.main(Native Method)
01-15 12:25:29.810: E/AndroidRuntime(2818): Caused by: android.database.sqlite.SQLiteException: no such table: user_select (code 1): , while compiling: SELECT * FROM user_select
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1253)
01-15 12:25:29.810: E/AndroidRuntime(2818): at com.example.cresto.library.DatabaseHandleruserLoad.getSelecteduserDetails(DatabaseHandleruserLoad.java:95)
01-15 12:25:29.810: E/AndroidRuntime(2818): at com.example.cresto.userToDet.onCreate(userToDet.java:50)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.Activity.performCreate(Activity.java:5231)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-15 12:25:29.810: E/AndroidRuntime(2818): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
01-15 12:25:29.810: E/AndroidRuntime(2818): ... 11 more
01-15 12:25:29.940: E/JSON(2818): {"tag":"fetchuser","success":1,"error":0,"user":{"mobile":"5089835","city":"LA","area":"Sector Sigma","uname":"udupy","uid":"udupy.5089","email":"udupy.5089@gmail.com"}}
user_select 是我试图在我的 onPostExecute()
中填充的 sqlite 数据库 table请在方法 onPostExecute 和 doInBackground 上方添加 @Override 注释。
您的 Sqlite DB 丢失 table.. 修复它，您的 post 执行将 运行
getKey(success) 也可能返回 null。添加带有日志的其他条件
更新：
doInBackground 并行发生，而主线程 (onCreate) 运行ning。因此， db.getSelectedUserDetails() 在 postExecute 被调用之前被调用并且程序崩溃而不给 postExecute 机会 运行 。相反，将 setContentView 之后的代码放在 postExecute.. 即：
DatabaseHandler db = new DatabaseHandler(getApplicationContext());
HashMap<String, Object> user = new HashMap<String, Object>();
user = db.getSelectedUserDetails();
我很确定这是你的问题。