how to change text in Android TextView

Question

I tried to do this   Override public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        setContentView R layout main        t new TextView this         t  TextView findViewById R id TextView01        t setText  Step One  blast egg         try           Thread sleep 10000         catch  InterruptedException e               TODO Auto-generated catch block         e printStackTrace               t setText  Step Two  fry egg      but for some reason  only the second text shows up when I run it   I think it might have something to do with the Thread sleep   method blocking  So can someone show me how to implement a timer  asynchronously    Thanks

User · Accepted Answer

I just posted this answer in the android-discuss google group

If you are just trying to add text to the view so that it displays "Step One: blast egg Step Two: fry egg" Then consider using t.appendText("Step Two: fry egg"); instead of t.setText("Step Two: fry egg");

If you want to completely change what is in the TextView so that it says "Step One: blast egg" on startup and then it says "Step Two: fry egg" at a time later you can always use a

Runnable example sadboy gave

Good luck

User · Answer

per your advice  i am using handle and runnables to switch change the content of the TextView using a  timer   for some reason  when running  the app always skips the second step   Step Two  fry egg    and only show the last  third  step   Step three  serve egg     TextView t   private String sText   private Handler mHandler   new Handler     private Runnable mWaitRunnable   new Runnable         public void run             t setText sText              Override public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        setContentView R layout main        mMonster   BitmapFactory decodeResource getResources                R drawable monster1        t new TextView this        t  TextView findViewById R id TextView01         sText    Step One  unpack egg       t setText sText        sText    Step Two  fry egg               mHandler postDelayed mWaitRunnable  3000        sText    Step three  serve egg       mHandler postDelayed mWaitRunnable  4000

User · Answer

The first line of new text view is unnecessary   t new TextView this      you can just do this  TextView t    TextView findViewById R id TextView01     as far as a background thread that sleeps here is an example  but I think there is a timer that would be better for this  here is a link to a good example using a timer instead http   android-developers blogspot com 2007 11 stitch-in-time html      Thread thr   new Thread mTask       thr start       Runnable mTask   new Runnable         public void run                just sleep for 30 seconds                      try                           Thread sleep 3000                           runOnUiThread done                         catch  InterruptedException e                               TODO Auto-generated catch block                         e printStackTrace                                                Runnable done   new Runnable             public void run                           t setText  done

User · Answer

Your using the thread in a wrong way   Just do the following   private void runthread      splashTread   new Thread                  Override             public void run                     try                       synchronized this                              wait 5 sec                         wait  splashTime                                            catch InterruptedException e                     finally                         call the handler to set the text                                                     splashTread start         That s it

User · Answer

user264892  I found that when using a String variable I needed to either prefix with an String of    or explicitly cast to CharSequence   So instead of   String Status    Asking Server      txtStatus setText Status     try   String Status    Asking Server      txtStatus setText  CharSequence  Status     or   String Status    Asking Server          txtStatus setText      Status     or  since your string is not dynamic  even better   txtStatus setText  AskingServer

User · Answer

Your onCreate   method has several huge flaws   1  onCreate prepares your Activity - so nothing that you do here will be made visible to the user until this method finishes  For example - you will never be able to alter a TextView s text here more than ONE time as only the last change will be drawn and thus visible to the user   2  Keep in mind that an Android program will - by default - run in ONE thread only  Thus  never use Thread sleep   or Thread wait   in your main thread which is responsible for your UI   read  Keep your App Responsive  for further information    What your initialization of your Activity does is    for no reason you create a new TextView object t  you pick your layout s TextView in the variable t later  you set the text of t  but keep in mind  it will be displayed only after onCreate   finishes and the main event loop of your application runs   you wait for 10 seconds within your onCreate method - this must never be done as it stops all UI activity and will definitely force an ANR  Application Not Responding  see link above   then you set another text - this one will be displayed as soon as your onCreate   method finishes and several other Activity lifecycle methods have been processed    The solution    Set text only once in onCreate   - this must be the first text that should be visible  Create a Runnable and a Handler  private final Runnable mUpdateUITimerTask   new Runnable         public void run                do whatever you want to change here  like          t setText  Second text to display              private final Handler mHandler   new Handler     install this runnable as a handler  possible in onCreate    but read my advice below       run the mUpdateUITimerTask s run   method in 10 seconds from now mHandler postDelayed mUpdateUITimerTask  10   1000      Advice  be sure you know an Activity s lifecycle  If you do stuff like that in onCreate  this will only happen when your Activity is created the first time  Android will possibly keep your Activity alive for a longer period of time  even if it s not visible  When a user  starts  it again - and it is still existing - you will not see your first text anymore        Always install handlers in onResume   and disable them in onPause    Otherwise you will get  updates  when your Activity is not visible at all  In your case  if you want to see your first text again when it is re-activated  you must set it in onResume    not onCreate

User · Answer

setting the text to sam textview twice is overwritting the first written text  So the second time when we use settext we just append the new string like  textview append  Step Two  fry egg

User · Answer

Zordid  Iambda answer is great  but I found that if I put   mHandler postDelayed mUpdateUITimerTask  10   1000     in the run   method and   mHandler postDelayed mUpdateUITimerTask  0     in the onCreate method make the thing keep updating

[android] how to change text in Android TextView

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