Develop Reference

Delivery of Listener from Service to Activity

My App adds a specific Activity by adding a Task in the Service, and performs a specific function within the Service based on the result of that Activity. And when the Activity starts, it inflates the Fragment and wants the result from this Fragment to be passed to the Service. So I tried to use Intent, but I couldn't deliver the instance. I know I can only ship objects
public interface TuneListener {
void tune(Uri channelUri);
}
private final class ItemViewClickedListener implements OnItemViewClickedListener {
#Override
public void onItemClicked(Presenter.ViewHolder itemViewHolder, Object item,
RowPresenter.ViewHolder rowViewHolder, Row row) {
Channel channel = (Channel) item;
Uri channelUri = TvContract.buildChannelUri(channel.getId());
listener.tune(channelUri);
getActivity().finishAndRemoveTask();
}
}
Above is the implementation in my fragment
And this is the contents of the Service Class that implements this tunelistener.
#Override
public void tune(Uri channelUri) {
onTune(channelUri);
}
This part is the call of Activity
Intent intent = new Intent();
intent.setClassName(getPackageName(), getPackageName() + ".MyActivity");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
How can I deliver that Listener to Activity or Fragment within this structure?

Get shared element transitions inside the recylerView

I need a shared transition in recylerview to an activity but getting the error "Application cannot be cast to Activity" tried passing Adpater.this/this/Adapter.class but nothing is working
ViewCompat.setTransitionName(holder.imageView, photo.getId());
holder.imageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(mContext, Fullscreen.class);
ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation((MainActivity) mContext, holder.imageView, ViewCompat.getTransitionName(holder.imageView));
mContext.startActivity(intent, options.toBundle());
}
});
}

problem is in (MainActivity)mContext line. Your mContext is Application type but you try to cast it to Activity type, thats why it throws ClassCastException. Declare your field as Activity mContext; instead of Context mContext; and IDE will show you that you init your mContext variable with wrong type object.

getStringExtra returns null SINGLE_TOP flag

I made one Fragment (ListA) with a ListView. When I click one item of the ListView I want to start the MainActivity.
public class ListA extends Fragment {
private WearableListView ListV;
...
private WearableListView.ClickListener mClickListener = new WearableListView.ClickListener() {
#Override
public void onClick(WearableListView.ViewHolder viewHolder) {
Intent intent= new Intent(getActivity().getApplicationContext(), MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
intent.putExtra("timestamp", "AAA");
startActivity(intent);
}
This is the MainActivity:
public class MainActivity extends Activity {
#Override
public void onResume() {
super.onResume();
if(getIntent().getStringExtra("timestamp")!=null){
Toast.makeText(getApplicationContext(),"Has Timestamp",Toast.LENGTH_SHORT).show();
}
}
When I add flag Intent.FLAG_ACTIVITY_SINGLE_TOP, getIntent().getStringExtra("timestamp") returns null. If I add flag Intent.FLAG_ACTIVITY_NEW_TASK it is not null.
I want to have flag Intent.FLAG_ACTIVITY_SINGLE_TOP and it returns null, I don't know why.

I think because MainActivity was already started before so no new intents is being passed to it.
Try destroying the main activity before you go to list activity. See if this works

AndroidRuntimeException "Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag"

I create multiple layouts inside a listview, but when i click i get a AndroidRuntimeException "Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?"
Im adding
Intent.FLAG_ACTIVITY_NEW_TASK
to my intent but i get the same message! =(
#Override
public View getView(int position, View convertView, ViewGroup parent) {
retval=LayoutInflater.from(getApplicationContext()).inflate(R.layout.layout_anuncio, null);
ImageView image=(ImageView) retval.findViewById(R.id.imageAD);
LoadAds loadAds= new CargaAnuncios();
clickUrl = LoadAds.cargaImagenAnuncio(image, mContext, GlobalInfo.ANUNCIO_CARRIL_PORTADA);
image.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View view) {
Bundle bundle=new Bundle();
bundle.putString("url", clickUrl);
Intent intent =new Intent(mContext,CustomWebView.class);
intent.putExtras(bundle);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(intent);
}
});
return retval;
}

Replace getApplicationContext() with this. Most likely, you should do that everywhere in your code that you have getApplicationContext() -- only use getApplicationContext() when you specifically need the Application object.

Old thread, but thought this easy solution might help someone. Instead of passing context around, just get it from view. For eg: view.getContext()
#Override
public void onClick(View view) {
Bundle bundle=new Bundle();
bundle.putString("url", clickUrl);
Intent intent =new Intent(view.getContext(),CustomWebView.class);
intent.putExtras(bundle);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
view.getContext().startActivity(intent);
}

I have added:
parent.getApplicationContext()
Instead of just:
getApplicationContext()
Whole line is:
retval=LayoutInflater.from(parent.getApplicationContext()).inflate(R.layout.layout_anuncio, null);

The solution of Warren Lankie Van Tonder is almost the good:
-You should avoid using Activity context and choose Application Context instead, in purpose to prevent memory leaks. This blog of an Android developer explains that http://android-developers.blogspot.be/2009/01/avoiding-memory-leaks.html
-But in the case of Activity context is the only solution for your code (maybe for calling another activity from outside an activity) and regarding the link above, you have to release the static reference in each onPause() with
AppGlobals.setAppContext(null);
In return, set the static field in onResume and not onCreate.

Thanks to CommonsWare i came up with this solution which worked best.
I added a new class
package com.test.test;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
public class AppGlobals extends Activity {
private static Context appContext;
public static Context getAppContext(){
return appContext;
}
public static void setAppContext(Context context){
appContext = context;
}
public static void StartActivity(Intent intent){
appContext.startActivity(intent);
}
}
All i needed to do then was add the below code on each activity onCreate that i navigated to.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
AppGlobals.setAppContext(this);
}
This allowed the new intent to start as if it working with normal application flow and this way i didn't have to set a Flag for the intent.
Calling the start activity method is as easy as:
Intent totalTimerIntent = new Intent(AppGlobals.getAppContext(), TotalTimer.class);
AppGlobals.StartActivity(totalTimerIntent);
Hope this helps someone as it has helped me.
Thank you CommonsWare.

CustomAdapter mAdapter = new CustomAdapter( getApplicationContext(), yourlist);
or
Context mContext = getAppliactionContext();
CustomAdapter mAdapter = new CustomAdapter( mContext, yourlist);
change to below
CustomAdapter mAdapter = new CustomAdapter( this, yourlist);

How to call An activity class from nonactivityclass (class without extends anything) in android?

I want call an activity class from a normal java class(without extends anything) for every some time interval to refresh the Ui, Is it possible to call an activity from normal java class. We can call the activity from another activity using intent and startactivity. But am not sure about calling the activity from class.
For example
class example extends Activity
{
}
class example2 extends Activity
{
// we can call like
Intent intent = new Intent(this.example2,example.class);
startActivity(intent);
}
class test
{
// How can i call example or example2 from here.
}
Thanks,
Lakshmanan

You could provide a parameter consisting of the context of your Activity that has been creating the Object. Then you can use the Context's methods just like within an Activity.
i.g.
public class Foo {
private Context context;
public Foo(Context context) {
this.context = context;
}
public void startActivity() {
context.startActivity(/*your intent here*/);
}
}

Intent intent12 = new Intent(context.getApplicationContext(), ImageClick.class);
context.startActivity(intent12);
It works. I've tried.

I use this to view you tube videos from a non activity class -
Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse(url));
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // important step
context.startActivity(intent);
Hope this helps you.
Salil.