I am scheduling a simple task that should update a text field in 4 seconds.
However everytime this is called the activity pauses and does not show the value in the text field until I restart the activity.
private void showDelayedValue() {
Runnable longRunningTask = new Runnable() {
public void run() {
int randomVal = randomNumberGenerator.nextInt(30 - -10) - 10; //random number between -10 and 30
String randomValStr = Integer.toString(randomVal);
Log.i(this.getClass().getSimpleName(),
"FIRED startScheduler: " + randomValStr);
theFieldOnScreenTV.setText(randomTempStr);
}
};
//show the value in 2 seconds
scheduledTaskExecutor.schedule(longRunningTask, 4, TimeUnit.SECONDS);
}
The log shows:
FIRED startScheduler: 4
but does not update the TextView theFieldOnScreenTV
Instead onPause is called right after Fired startScheduler: is displayed in LogCat.
Many thanks!
EDIT:
This worked for me following Alex' approach:
private void showDelayedValue() {
int randomX = randomNumberGenerator.nextInt(30 - -10) - 10;
final String randomXStr = Integer.toString(randomX);
final Runnable updateFieldR = new Runnable() {
public void run() {
theFieldOnScreenTV.setText(randomXStr);
}
};
Runnable longRunningTask = new Runnable() {
public void run() {
theFieldOnScreenTV.post(updateFieldR);
}
};
scheduledTaskExecutor.schedule(longRunningTask, 4, TimeUnit.SECONDS);
}
instead of
theFieldOnScreenTV.setText(randomTempStr);
try
theFieldOnScreenTV.post(new Runnable() { theFieldOnScreenTV.setText(randomTempStr); } );
Have a try using Handlers.
Handler handler = new Handler();
handler.post(new Runnable() {
#Override
public void run() {
theFieldOnScreenTV.setText(randomTempStr);
}
});
Related
my_text.setText("Dave");
//Small pause...
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
my_text.setText("Bob");
I want to change my textView, pause 1 second, then change it again. When I run the program, it doesn't refresh after first change. It just shows the second change after returning. How can I force the refresh on the first change to the textview?
Try use Handler like below code
my_text.setText("Dave");
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
my_text.setText("Bob");
}
});
}
}, 1000);
Try below for the edited question
Keep your all 20 names in any collection array or list.
int position = 0;
String names [] = {"0","1","20"};
Handler handler = new Handler(getMainLooper());
Runnable runnable = new Runnable() {
public void run() {
my_text.setText(names[position++]);
if (position < names.length) {
handler.postDelayed(this, 1000);
}
}
};
handler.postDelayed(runnable, 1000);
I download gocoder android example and run the BitmapOverlayActivity, everything is ok but when I try to update the WZBitmap using WZBitmap.setBitmap() like:
private Runnable runnable = new Runnable() {
#Override
public void run() {
if (mWZBitmap != null) {
if (System.currentTimeMillis() % 2 == 0) {
mWZBitmap.setBitmap(overlayBitmap1);
} else {
mWZBitmap.setBitmap(overlayBitmap2);
}
}
handler.postDelayed(runnable, 5000);
}
};
private Handler handler = new Handler();
and the camera only shows black view:
I am developing an app in which a thread will run in main thread and it will call a list of users in every 1 sec,but i am getting the pop up that ANR. please suggest. How To Resolve?
Below is my code
super.onCreate(savedInstanceState);
System.setProperty("java.net.preferIPv4Stack", "true");
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_main);
mHandler = new Handler();
Runnable runable = new Runnable() {
#Override
public void run() {
try{
listofUsers = GcmIntentService.getListOfUsers();
if (listofUsers.size() > 0) {
for (int index = 0; index < listofUsers.size(); index++) {
if (index == 0) {
startTime = listofUsers.get(0).getLoggedinDateTime();
} else {
Calendar calender1 = Calendar.getInstance();
calender1.setTime(startTime);
calender1.add(Calendar.SECOND, i);
newTime = calender1.getTime();
listofUsers.get(index).setLoggedinDateTime(newTime);
i = i + 72;
}
///user time is checked with the current system time.
Iterator<UserInformation> userDetailsIter = listofUsers.iterator();
Calendar calender2 = Calendar.getInstance();
while (userDetailsIter.hasNext()) {
UserInformation newUserInfo = userDetailsIter.next();
Date userTime=newUserInfo.getLoggedinDateTime();
Date systemTime=calender2.getTime();
if ( userTime.compareTo(systemTime) < 0 ) {
userDetailsIter.remove();
}
}
}
}
mHandler.postDelayed(this, 1000);
}
catch (Exception e) {
// TODO: handle exception
}
finally{
//also call the same runnable
mHandler.postDelayed(this, 100);
}
}
};
mHandler.postDelayed(runable, 100);
}
Please help me by guiding me about what I have done wrong
You can't make a while loop or any kind of long running operation on main queue
why don't you make a normal thread inside a repeated timer
like the below code
Timer myTimer = new Timer();
myTimer.schedule(new TimerTask() {
#Override
public void run() {
check();
}
}, 0, 100);
and inside check make a thread and do what ever you want
public void check(){
new Thread(new new Runnable() {
#Override
public void run() {
// do what you want here
}
}).start();
}
Hi every one can you help to create a 5 seconds timer that runs for every 3 or 5 seconds.. im new in android pls help me
i have only created a 5 seconds timer but it only run once.. i want it to run for every 5 seconds..
and here is my code :
txt1 = (TextView)findViewById(R.id.textView1);
final Handler handler = new Handler();
TimerTask task = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
public void run() {
// pos=rand.nextInt(10);
//txt1.setText(""+pos);
if(Integer.parseInt(txt1.getText().toString()) != 0)
{
txt1.setText("" + (Integer.parseInt(txt1.getText().toString()) - 1));
}
}
});
}
};
Timer timer = new Timer();
timer.schedule(task, 1000, 1000);
Thx :)
You can do it using below code, handler calls itself again and again.
final Handler handler = new Handler();
Runnable runable = new Runnable() {
#Override
public void run() {
try{
if(Integer.parseInt(txt1.getText().toString()) != 0)
{
txt1.setText("" + (Integer.parseInt(txt1.getText().toString()) - 1));
}
handler.postDelayed(this, 3000);
}
catch (Exception e) {
// handle exception
}
}
};
handler.postDelayed(runable, 5000);
i have a function To run messages in a queue. But when I run this the last handler gets executed only, not the first one! Help!
void functionShow()
{
button.setVisibility(View.INVISIBLE);
txt.setText("Generating Unique ID ... Please Wait ");
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
txt.setText("Sending SMS ... Please Wait");
}
}, 10000);
Handler handler1 = new Handler();
handler1.postDelayed(new Runnable () {
public void run()
{
txt.setText("Done");
}
}, 10000);
}
All i am trying to do is: First text should come as "Generating Unique ID ... " Then after 10 secs "Sending SMS ... " Then again after 10 secs "Done"
Both have the same delay... I guess the first one is being executed and a couple of milliseconds after that the second one is executed; so it looks like the second one is the only that is being executed.
The ugly way:
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
txt.setText("Sending SMS ... Please Wait");
postDelayed(new Runnable () {
public void run(){
txt.setText("Done");
}
}, 10000);
}
}, 10000);
The cool way:
private static final int SENDING = 1;
private static final int DONE = 2;
Handler handler = new Handler(){
public void handleMessage(Message msg){
switch(msg.what){
case SENDING:
txt.setText("Sending SMS");
sendEmptyMessageDelayed(DONE, 10000);
break;
case DONE:
txt.setText("Done");
break;
}
}
};
handler.sendEmptyMessageDelayed(SENDING, 10000);