I am working on an android app in which i want to hide my image view after some interval. i am using this code but it is not hiding. can anybody tell me how i can hide it ???
showtrue1.setBackgroundResource(R.drawable.ticktrue);
showtrue1.setVisibility(View.VISIBLE);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
showtrue1.setVisibility(View.GONE);
Try CountDownTimer:
new CountDownTimer(1000, 100) {
public void onTick(long millisUntilFinished) {
// implement whatever you want for every tick
}
public void onFinish() {
showtrue1.setVisibility(View.GONE);
}
}.start();
You can use async Task also to solve your problem . In its backgound function make a thread sleep for particular second and in the post method make trhe visibility gone for your image viiew.
Call the execute method in your oncreate
new MyAsyncTask().execute();
and make an inner class as defined below:
private class MyAsyncTask extends AsyncTask<Void, Void, Void>{
#Override
protected void onPreExecute(){
// show your progress dialog
showtrue1.setBackgroundResource(R.drawable.ticktrue);
showtrue1.setVisibility(View.VISIBLE);
}
#Override
protected Void doInBackground(Void... voids){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void params)
{
showtrue1.setVisibility(View.GONE);
}
}
Create a separate thread that sleeps for 1 seconds then call runOnUiThread to hide the view.
Thread thread = new Thread() {
#Override
public void run() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
runOnUiThread(new Runnable() {
#Override
public void run() {
// Do some stuff
showtrue1.setVisibility(View.GONE);
}
});
}
};
Related
I am making a project in which i am using the progressdialog and i want to show this progress dialog on creation of activity and i am able to that. In the on create method i want the image to be invisible and i want image to be visible after completion of progress dialog but it is throwing exception in the line imagevisible();
The logcat is:
04-12 12:48:35.309: E/AndroidRuntime(4994): at com.example.project1.ShowPassword$waiter.run(ShowPassword.java:59)
Code
ImageView iv;
ProgressDialog p;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.showpass);
iv=(ImageView)findViewById(R.id.imageView1);
iv.setVisibility(View.INVISIBLE);
p= new ProgressDialog(this);
p.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
p.setTitle("Getting Password: ");
p.setMessage("Loading:");
p.setMax(100);
p.show();
Thread t=new Thread(new waiter());
t.start();
public class waiter extends Thread{
public void run(){
for(int i=0; i<5; i++){
p.incrementProgressBy(20);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}p.dismiss();
imagevisible();
}
}
public void imagevisible(){
iv.setVisibility(View.VISIBLE);
}
You can't change UI from non UI thread. You can use runOnUiThread method of Activity:
public class waiter extends Thread{
public void run(){
//...
runOnUiThread(new Runnable() {
#Override
public void run() {
imagevisible();
}
});
}
}
What you want is an AsyncTask. Implement doInBackground() (runs in the background) and onPostExecute() (runs on the UI thread).
https://developer.android.com/reference/android/os/AsyncTask.html
I want to show a Progress-Dialog before my view has been loaded.
First i wrote the code in onCreate() but the dialog doesn't appear in that case. So i wrote it in onResume() but in this case, it doesn't disappear even after the view has been loaded. can anyone tell whats going wrong here?
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
dialog = ProgressDialog.show(this, "", "Please wait...", true);
//dialog.cancel();
new Thread()
{
public void run()
{
try
{
sleep(1500);
// do the background process or any work that takes time to see progress dialog
}
catch (Exception e)
{
Log.e("tag",e.getMessage());
}
// dismiss the progressdialog
dialog.dismiss();
}
}.start();
citySelected.setText(fetchCity);
spinner.setSelection(getBG);
}
You cant update UI(which is in main UIthread) from other threads. If you want to run any query in the background, you can use AsyncTask.
In onPreExecute method, show dialog and onPostExecute you can dismiss the dialog.
If you want to use Thread, then update UI using handlers.
Using AsyncTask
public class MyAsyncTask extends AsyncTask<String, Void, String> {
ProgressDialog dialog = new ProgressDialog(ActivityName.this);
#Override
protected void onPreExecute() {
dialog.show();
super.onPreExecute();
}
#Override
protected String doInBackground(String... params) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String result) {
dialog.dismiss();
super.onPostExecute(result);
}
}
In Activity onCreate Method,
MyAsyncTask task = new MyAsyncTask();
task.execute();
better to use Asynctask ......... but if you still want same or want to know the solution only then can try
new Thread()
{
public void run()
{
try
{
sleep(1500);
// do the background process or any work that takes time to see progress dialog
}
catch (Exception e)
{
Log.e("tag",e.getMessage());
}
YourActivity.this.runOnUIThread(new Runnable(){
#Override
public void run(){
// dismiss the progressdialog
dialog.dismiss();
});
}
}.start();
You can use AsyncTask. It is better than Thread
private class DownloadingProgressTask extends
AsyncTask<String, Void, Boolean> {
private ProgressDialog dialog = new ProgressDialog(ShowDescription.this);
protected void onPreExecute() {
this.dialog.setMessage("Please wait");
this.dialog.show();
}
protected Boolean doInBackground(final String... args) {
try {
downloadFile(b.getString("URL"));
return true;
} catch (Exception e) {
Log.e("tag", "error", e);
return false;
}
}
#Override
protected void onPostExecute(final Boolean success) {
if (dialog.isShowing()) {
dialog.dismiss();
}
}
}
i got this progress dialog code:
new Thread() {
#Override
public void run() {
try {
sleep(1000);
}
catch (Exception e) {
Log.e("tag", e.getMessage());
}
// dismiss the progress dialog
progressDialog.dismiss();
}
}.start();
and i got text that will apear after some httprequest actions:
editText2.setText(stringEr);
how do i sync between them? i want that the text will be hidden untill the progress will finish
tnx!
You have to use Handlers to update your UI. A little modification here,
new Thread()
{
#Override
public void run()
{
try
{
//Instead of sleep, call your http request method here.
handler.sendEmptyMessage(0);
}
catch (Exception e)
{
Log.e("tag", e.getMessage());
}
// dismiss the progress dialog
progressDialog.dismiss();
}
}.start();
And create a handler in onCreate(),
Handler handler=new Handler()
{
public void handleMEssage(Message msg)
{
if(msg.what==0)
editText2.setText(stringEr);
}
};
i think you should use AsyncTask for that and you can hide in OnPreExecute Method i mean when asynctask in started and show in OnPostExecute method. after complete the progress.
Android skip the painful Threading concept, Use Asyntask class.
http://developer.android.com/reference/android/os/AsyncTask.html
private class UIOperation extends AsyncTask<String, Void, String> {
#Override
protected void onPreExecute() {
//show dialog
}
#Override
protected String doInBackground(String... params) {
//collect data
return null;
}
#Override
protected void onPostExecute(String result) {
//dismiss dialog
//update UI
}
}
All i want to do is display a text for 1000 milliseconds and get the next thing.. dialogs are slow to pop up so i used a textview..but its not working.. the code snippet is given..
What am I doing wrong?
Thread sleep_for_sometime = new Thread() {
public void run() {
try {
correct.setVisibility(TextView.VISIBLE);
sleep(1000);
correct.setVisibility(TextView.INVISIBLE);
} catch (InterruptedException e) {
e.printStackTrace();
}
finally {
get_question(questionset[i]);
}
}
};
//sleep_for_sometime.setDaemon(false);
sleep_for_sometime.start();
You should change visibility in UI thread. Read painless threading
AsyncTask is great, but overused in some ways I think. Just use post/postDelayed. You're not really doing background work, you just want to delay some UI-thread work. Definitely read Nikita's link, but I would do something like:
correct.setVisibility(View.VISIBLE);
correct.postDelayed(new Runnable() {
correct.setVisibility(View.INVISIBLE);
get_question(questionset[i]);
}, 1000);
Expanding Nikita's Answer , you could do something like this
private class SleepTask extends AsyncTask<Void,Integer,Void> {
#Override
protected Void doInBackground(Void... params) {
try {
publishProgress(0);
sleep(1000);
publishProgress(1);
}catch(Exception e){
//null
}
}
#Override
protected void onProgressUpdate(Integer... i){
if(i[0]==0){
correct.setVisibility(TextView.VISIBLE);
}else{
correct.setVisibility(TextView.INVISIBLE);
}
}
#Override
protected void onPostExecute(Void res) {
get_question(questionset[i]);
}
#Override
protected void onPreExecute() {
//do something before execution
}
}
to start the thread , do this
new SleepTask().execute();
I want show dialog after finish Thread.
In thread I am changing TextView's Value like as 0 to 100...
When TextView Value is reach 100 then i want to show dialog..
What i do for it.
Thanks in advance...
Code Snippet:
final Thread thread = new Thread(new Runnable()
{
#Override
public void run()
{
synchronized (this)
{
try
{
for(int i=0 ; i<speed; i++)
{
final int value=i+1;
wait(3000/speed);
Test.this.runOnUiThread(new Runnable() {#Override public void run()
{
accText.setText(String.valueOf(value));
}});
}
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
thread.start();
this is asyntask code snippet...
class setTextBackgroundTask extends AsyncTask<String , Integer, Void>
{
#Override
protected void onPreExecute()
{
}
#Override
protected Void doInBackground(String... params)
{
Thread th = new Thread();
int value;
for(int i=0 ; i<speed; i++)
{
value=i+1;
publishProgress(value);
try {
th.sleep(3000/speed);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
#Override
protected void onProgressUpdate(Integer... values)
{
accText.setText(String.valueOf(values[0]));
System.out.println("Value=="+values[0]);
super.onProgressUpdate(values);
}
#Override
protected void onPostExecute(Void result)
{
showShareDialog();
}
}
This document explains how you can create dialogs.
Please note that you will have to do any dialog creation code on the UI thread.
You already have code that runs something on the UI thread, just do that outside the loop,but with the dialog creation code inside.
You should use AsyncTask: subclass AsyncTask, override doInBackground() to execute your time consuming action on another thread, and then override onPostExecute() to show your dialog.
Note that you cannot change UI elements from a non-UI (background) thread. AsyncTask takes care of that for you: it calls doInBackground() on a new thread and then calls onPostExecute() on the UI thread as soon as the background task is complete.