Java – add a view (text view) in asynctask

I use the following code to add a text view to the async task, but:

07-26 11:40:39.302: E/AndroidRuntime(26715): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
07-26 11:40:39.312: E/AndroidRuntime(26715): java.lang.RuntimeException: An error occured while executing doInBackground()
07-26 11:40:39.312: E/AndroidRuntime(26715):    at android.os.AsyncTask$3.done(AsyncTask.java:200)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at java.lang.Thread.run(Thread.java:1096)
07-26 11:40:39.312: E/AndroidRuntime(26715): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
07-26 11:40:39.312: E/AndroidRuntime(26715):    at android.view.ViewRoot.checkThread(ViewRoot.java:2683)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at android.view.ViewRoot.invalidateChild(ViewRoot.java:570)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:596)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at android.view.ViewGroup.invalidateChild(ViewGroup.java:2481)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at android.view.View.invalidate(View.java:5027)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at android.view.ViewGroup.addView(ViewGroup.java:1840)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at android.view.ViewGroup.addView(ViewGroup.java:1821)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at com.learning.chiazi.MainActivity.addTextView(MainActivity.java:180)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at com.learning.chiazi.MainActivity$Proccess.doInBackground(MainActivity.java:243)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at com.learning.chiazi.MainActivity$Proccess.doInBackground(MainActivity.java:1)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at android.os.AsyncTask$2.call(AsyncTask.java:185)
07-26 11:40:39.312: E/AndroidRuntime(26715):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
07-26 11:40:39.312: E/AndroidRuntime(26715):    ... 4 more
07-26 11:40:39.342: E/SemcCheckin(26715): Get crash dump level : java.io.FileNotFoundException: /data/semc-checkin/crashdump

How can I solve this problem?

Code:

   public void addTextView(int belowId, int id,String text){
        RelativeLayout rSub= (RelativeLayout) findViewById(R.id.rSub);
        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);
        lp.addRule(RelativeLayout.BELOW, belowId);
        lp.addRule(RelativeLayout.ALIGN_PARENT_LEFT);

        TextView tv = new TextView(this);
        tv.setId(id);

        tv.setText(text+"\n");
        rSub.addView(tv, lp);

    }

   class Proccess extends AsyncTask<Void, Void, Void>{

        @Override
        protected Void doInBackground(Void... arg0) {
            addTextView(R.id.tvResult, 1234, "s");
            return null;
        }
    }

resolvent:

Run the UI thread in the background method like this

@Override
        protected Void doInBackground(Void... arg0) {
            this.runOnUiThread(new Runnable() {
            public void run() {
                addTextView(R.id.tvResult, 1234, "s");
        });
            return null;
        }