我已经在后台线程上实现了一个JSON Parser，然后尝试使用一些嵌入式代码将数据写入UI Thread上的一系列TableRows，其中包含一个处理程序，让我回到正常的UI线程上。代码不断返回此堆栈跟踪
Process: webmd.mmu.ac.uk.wmfinal3, PID: 6123
java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
at android.view.ViewGroup.addViewInner(ViewGroup.java:3562)
at android.view.ViewGroup.addView(ViewGroup.java:3415)
at android.widget.TableLayout.addView(TableLayout.java:429)
at android.view.ViewGroup.addView(ViewGroup.java:3360)
at android.widget.TableLayout.addView(TableLayout.java:411)
at android.view.ViewGroup.addView(ViewGroup.java:3336)
at android.widget.TableLayout.addView(TableLayout.java:402)
at webmd.mmu.ac.uk.wmfinal3.MainActivity$ProgressTask$1$1.run(MainActivity.java:244)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
04-21 14:58:08.506 6199-6199/webmd.mmu.ac.uk.wmfinal3 D/gralloc_goldfish﹕ Emulator without GPU emulation detected.
04-21 14:58:11.316 6199-6215/webmd.mmu.ac.uk.wmfinal3 D/dalvikvm﹕ GC_FOR_ALLOC freed 209K, 10% free 3129K/3460K, paused 2ms, total 2ms
04-21 14:58:11.336 6199-6199/webmd.mmu.ac.uk.wmfinal3 D/AndroidRuntime﹕ Shutting down VM
04-21 14:58:11.336 6199-6199/webmd.mmu.ac.uk.wmfinal3 W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb0cb3b20)
04-21 14:58:11.336 6199-6199/webmd.mmu.ac.uk.wmfinal3 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: webmd.mmu.ac.uk.wmfinal3, PID: 6199
java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
at android.view.ViewGroup.addViewInner(ViewGroup.java:3562)
at android.view.ViewGroup.addView(ViewGroup.java:3415)
at android.widget.TableLayout.addView(TableLayout.java:429)
at android.view.ViewGroup.addView(ViewGroup.java:3360)
at android.widget.TableLayout.addView(TableLayout.java:411)
at android.view.ViewGroup.addView(ViewGroup.java:3336)
at android.widget.TableLayout.addView(TableLayout.java:402)
at webmd.mmu.ac.uk.wmfinal3.MainActivity$ProgressTask$1$1.run(MainActivity.java:245)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
我尝试将所有代码移动到AsyncTask中，但它要求在UI线程上。
这是我的代码。任何帮助将不胜感激。
protected Boolean doInBackground(final String... args) {
final TableLayout tl = (TableLayout) findViewById(R.id.table);
final TableRow v1 = new TableRow(MainActivity.this);
JSONParser jParser = new JSONParser();
String temp = "http://sandbox.kriswelsh.com/hygieneapi/hygiene.php?op=nearest&lat=" + latitude + "&long=" + longitude;
JSONArray json = jParser.getJSONFromUrl(temp);
int [] test = new int [10];
for (int i = 0; i < 10; i++) {
try {
JSONObject c = json.getJSONObject(i);
String vid = c.getString(id);
String vbn = c.getString(BusinessName);
String va1 = c.getString(Add1);
String va2 = c.getString(Add2);
String va3 = c.getString(Add3);
String vpost = c.getString(Post);
String vlong = c.getString(longitudej);
String vrate = c.getString(RatingDate);
String vratestar = c.getString(Rating);
String vlat = c.getString(latitudej);
if (vratestar.contentEquals("-1")) {
vratestar = "Exempt";
}
//testing(vbn,va1,va2,va3,vpost,vratestar);
//TableLayout tl = (TableLayout) findViewById(R.id.table);
isRunning = true;
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
while (isRunning) {
try {
// Thread.sleep(10000);
mHandler.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
tl.addView(v1);
}
});
} catch (Exception e) {
// TODO: handle exception
}
}
}
}).start();
isRunning = false;
//jsonlist.add(map);
} catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
更新：现在显示v1初始化
答案 0 :(得分：0)
查看您的while (isRunning)循环，我想您尝试在每次迭代时向v1添加相同的TableRow TableLayout视图（但是，这只是猜测，因为你没有发布v1声明）。当然，在第二次它会给你一个错误，因为它已经有父，你应该每次都创建新的TableRow对象。更进一步，您不需要Handler与UI线程相关联，因为您使用的是AsyncTask，您可以利用onPostExecute这一事实方法在主线程上执行。考虑到它，您可以编写以下AsyncTask实现：
class MyAsyncTask extends AsyncTask<Void, Void, JSONArray>{
@Override
protected JSONArray doInBackground(Void... params) {
JSONParser jParser = new JSONParser();
String temp = "http://sandbox.kriswelsh.com/hygieneapi/hygiene.php?op=nearest&lat=" + latitude + "&long=" + longitude;
JSONArray json = jParser.getJSONFromUrl(temp);
return json;
}
@Override
protected void onPostExecute(JSONArray json) {
TableLayout tl = (TableLayout) findViewById(R.id.table);
for (int i = 0; i < 10; i++) {
try {
JSONObject c = json.getJSONObject(i);
String vid = c.getString(id);
String vbn = c.getString(BusinessName);
String va1 = c.getString(Add1);
String va2 = c.getString(Add2);
String va3 = c.getString(Add3);
String vpost = c.getString(Post);
String vlong = c.getString(longitudej);
String vrate = c.getString(RatingDate);
String vratestar = c.getString(Rating);
String vlat = c.getString(latitudej);
if (vratestar.contentEquals("-1")) {
vratestar = "Exempt";
}
TableRow tableRow = new TableRow(context);
//configuring row, setting layout params
tl.addView(tableRow);
} catch (JSONException ex){
//error handling
}
}
}
}