I figured something out which I thought would work, within my
LoginTask class I created an object which was of the parent activity:
Test101 mParentActivity;
and then:
protected void onPostExecute(String result) {
Intent i=new Intent(ctx,SillyActivity.class);
mParentActivity.startActivity(i);
}
An error is thrown:
03-07 01:04:50.259: ERROR/AndroidRuntime(801): Uncaught handler:
thread main exiting due to uncaught exception
03-07 01:04:50.319: ERROR/AndroidRuntime(801):
java.lang.NullPointerException
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
org.tutorial.test101.tasks.LoginTask.onPostExecute(LoginTask.java:46)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
org.tutorial.test101.tasks.LoginTask.onPostExecute(LoginTask.java:1)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
android.os.AsyncTask.finish(AsyncTask.java:416)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
android.os.AsyncTask.access$300(AsyncTask.java:127)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:428)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
android.os.Handler.dispatchMessage(Handler.java:99)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
android.os.Looper.loop(Looper.java:123)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
android.app.ActivityThread.main(ActivityThread.java:3948)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
java.lang.reflect.Method.invokeNative(Native Method)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
java.lang.reflect.Method.invoke(Method.java:521)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
com.android.internal.os.ZygoteInit
$MethodAndArgsCaller.run(ZygoteInit.java:782)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
03-07 01:04:50.319: ERROR/AndroidRuntime(801): at
dalvik.system.NativeStart.main(Native Method)
Stuck again it seems..
On Mar 6, 10:57 pm, John Wesonga <[email protected]> wrote:
> I just modified my onPostExecute(...) method:
>
> protected void onPostExecute(String result) {
>
> Log.i("LOGGER", "Done...");
> pDialog.dismiss();
> if(result=="success"){
> Toast.makeText(ctx, "complete",
> Toast.LENGTH_LONG).show();
> Intent i=new Intent(ctx,SillyActivity.class);
> startActivity(i);
> }else{
> Toast.makeText(ctx, "fail",
> Toast.LENGTH_LONG).show();
> }
>
> super.onPostExecute(result);
> }
>
> ctx is my context
> I noticed that I can't call the startActivity(Intent i) method within
> the AsyncTask, how else would I start an activity from here?
>
> On Mar 6, 10:13 pm, Romain Guy <[email protected]> wrote:
>
>
>
> > onPostExecute() is invoked on the UI thread so you can use this method
> > to start an Activity. It's pretty much what it's for.
>
> > On Fri, Mar 5, 2010 at 6:29 AM, John Wesonga <[email protected]> wrote:
> > > I have a simple app and I'm using the AsyncTask to test out a
> > > background process, for clearness purposes I've opted to put my
> > > AsyncTask in a separate class rather than in an inner class, which
> > > where my problems begin, this is my AsyncTask
>
> > > package org.tutorial.test101.tasks;
>
> > > import android.app.ProgressDialog;
> > > import android.content.Context;
> > > import android.os.AsyncTask;
> > > import android.util.Log;
>
> > > public class LoginTask extends AsyncTask<String, String, String> {
>
> > > Context ctx;
> > > ProgressDialog pDialog;
>
> > > public LoginTask(Context context){
> > > super();
> > > this.ctx=context;
> > > }
> > > �...@override
> > > protected String doInBackground(String... params) {
> > > Log.i("LOGGER", "Starting...");
> > > try{
> > > Thread.sleep(8000);
> > > }catch(InterruptedException e){
>
> > > }
> > > return null;
> > > }
>
> > > �...@override
> > > protected void onPostExecute(String result) {
>
> > > Log.i("LOGGER", "Done...");
> > > pDialog.dismiss();
> > > //
> > > super.onPostExecute(result);
> > > }
>
> > > �...@override
> > > protected void onPreExecute() {
> > > pDialog=new ProgressDialog(ctx);
> > > pDialog.setTitle("Login");
> > > pDialog.setMessage("doing stuff..");
> > > pDialog.show();
> > > }
>
> > > }
>
> > > What I'd like is that once the task is complete, I do something in the
> > > UI thread may be start another activity or even display a Toast saying
> > > activity complete. I know I can't start a new Activity in the
> > > onPostExecute() so I need to start it in the UI thread any idea how I
> > > can do this? This is my Activity that starts the AsyncTask
>
> > > package org.tutorial.test101.activities;
>
> > > import org.tutorial.test101.tasks.LoginTask;
>
> > > import android.app.Activity;
> > > import android.app.Dialog;
> > > import android.content.Context;
> > > import android.os.AsyncTask;
> > > import android.os.Bundle;
> > > import android.util.Log;
> > > import android.view.View;
> > > import android.view.View.OnClickListener;
> > > import android.widget.Button;
>
> > > public class Test101 extends Activity{
> > > private Button btnLogin;
> > > private LoginTask mLoginTask;
> > > private Context context=this;
> > > /** Called when the activity is first created. */
> > > �...@override
> > > public void onCreate(Bundle savedInstanceState) {
> > > super.onCreate(savedInstanceState);
> > > setContentView(R.layout.main);
> > > btnLogin=(Button)findViewById(R.id.btnLogin);
> > > btnLogin.setOnClickListener(new OnClickListener(){
>
> > > public void onClick(View v) {
> > > if(mLoginTask==null){
> > > mLoginTask=new LoginTask(context);
> > > mLoginTask.execute(null);
> > > }
>
> > > }
>
> > > });
> > > }
>
> > > }
>
> > > --
> > > You received this message because you are subscribed to the Google
> > > Groups "Android Developers" group.
> > > To post to this group, send email to [email protected]
> > > To unsubscribe from this group, send email to
> > > [email protected]
> > > For more options, visit this group at
> > >http://groups.google.com/group/android-developers?hl=en
>
> > --
> > Romain Guy
> > Android framework engineer
> > [email protected]
>
> > Note: please don't send private questions to me, as I don't have time
> > to provide private support. All such questions should be posted on
> > public forums, where I and others can see and answer them
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