Hello, this is my first question here, though I've being reading this forum for quite a while. Most of
the answers
to my doubts are from here :)
Getting back on topic. I'm developing an Android application. I'm drawing a dynamic layout that are basically Galleries, inside a LinearLayout, inside a ScrollView, inside a RelativeLayout.
The ScrollView is a must, because I'm drawing a dynamic amount of galleries that most probably will not fit on
the screen.
When I scroll inside
the layout, I have
to wait 3/4 seconds until
the ScrollView "deactivates"
to be able
to scroll inside
the galleries. What I want
to do is
to reduce this time
to a minimum. Preferably I would like
to be able
to scroll inside
the galleries as soon as I lift my finger from
the screen, though anything lower than 2 seconds would be great as well.
I've being googling around for a solution but all I could find until now where layout tutorials that didn't tackle this particular issue. I was hoping someone here knows if this is possible and if so
to give me some hints on
how to do so.
I would prefer not
to do my own ScrollView
to solve this. But if that is
the only way I would appreciate some help because I'm not really sure
how would I solve this issue by doing that.
this is my layout:
public class PicturesL extends Activity implements OnClickListener,
OnItemClickListener, OnItemLongClickListener {
private ArrayList<ImageView> imageView = new ArrayList<ImageView>();
private StringBuilder PicsDate = new StringBuilder();
private CaWaApplication application;
private long ListID;
private ArrayList<Gallery> gallery = new ArrayList<Gallery>();
private ArrayList<Bitmap> Thumbails = new ArrayList<Bitmap>();
private String idioma;
private ArrayList<Long> Days = new ArrayList<Long>();
private long oldDay;
private long oldThumbsLoaded;
private ArrayList<Long> ThumbailsDays = new ArrayList<Long>();
private ArrayList<ArrayList<Long>> IDs = new ArrayList<ArrayList<Long>>();
@Override
public void onCreate(Bundle savedInstancedState) {
super.onCreate(savedInstancedState);
RelativeLayout layout = new RelativeLayout(this);
ScrollView scroll = new ScrollView(this);
LinearLayout realLayout = new LinearLayout(this);
ArrayList<TextView> texts = new ArrayList<TextView>();
Button TakePic = new Button(this);
idioma = com.mateloft.cawa.prefs.getLang(this);
if (idioma.equals("en")) {
TakePic.setText("Take Picture");
} else if (idioma.equals("es")) {
TakePic.setText("Sacar Foto");
}
RelativeLayout.LayoutParams scrollLP = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,
RelativeLayout.LayoutParams.FILL_PARENT);
layout.addView(scroll, scrollLP);
realLayout.setOrientation(LinearLayout.VERTICAL);
realLayout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT));
scroll.addView(realLayout);
TakePic.setId(67);
TakePic.setOnClickListener(this);
application = (CaWaApplication) getApplication();
ListID = getIntent().getExtras().getLong("listid");
getAllThumbailsOfID();
LinearLayout.LayoutParams TakeLP = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
realLayout.addView(TakePic);
oldThumbsLoaded = 0;
int galler = 100;
for (int z = 0; z < Days.size(); z++) {
ThumbailsManager croppedThumbs = new ThumbailsManager(Thumbails,
oldThumbsLoaded,
ThumbailsDays.get(z));
oldThumbsLoaded = ThumbailsDays.get(z);
texts.add(new TextView(this));
texts.get(z).setText("Day " + Days.get(z).toString());
gallery.add(new Gallery(this));
gallery.get(z).setAdapter(new ImageAdapter(this, croppedThumbs.getGallery(), 250, 175, true,
ListID));
gallery.get(z).setOnItemClickListener(this);
gallery.get(z).setOnItemLongClickListener(this);
gallery.get(z).setId(galler);
galler++;
realLayout.addView(texts.get(z));
realLayout.addView(gallery.get(z));
}
Log.d("PicturesL", "ListID: " + ListID);
setContentView(layout);
}
private void getAllThumbailsOfID() {
ArrayList<ModelPics> Pictures = new ArrayList<ModelPics>();
ArrayList<String> ThumbailsPath = new ArrayList<String>();
Pictures = application.dataManager.selectAllPics();
long thumbpathloaded = 0;
int currentID = 0;
for (int x = 0; x < Pictures.size(); x++) {
if (Pictures.get(x).walkname == ListID) {
if (Days.size() == 0) { Days.add(Pictures.get(x).day); oldDay = Pictures.get(x).day;
IDs.add(new ArrayList<Long>()); currentID = 0; }
if (oldDay != Pictures.get(x).day) {
oldDay = Pictures.get(x).day;
ThumbailsDays.add(thumbpathloaded);
Days.add(Pictures.get(x).day);
IDs.add(new ArrayList<Long>());
currentID++;
}
StringBuilder tpath = new StringBuilder();
tpath.append(Pictures.get(x).path.substring(0,
Pictures.get(x).path.length() - 4));
tpath.append("-t.jpg");
IDs.get(currentID).add(Pictures.get(x).id);
ThumbailsPath.add(tpath.toString());
thumbpathloaded++;
if (x == Pictures.size() - 1) {
Log.d("PicturesL", "El ultimo de los arrays, tamaño: " + Days.size());
ThumbailsDays.add(thumbpathloaded);
}
}
}
for (int y = 0; y < ThumbailsPath.size(); y++) {
Thumbails.add(BitmapFactory.decodeFile(ThumbailsPath.get(y)));
}
}
I had a memory leak on another activity when
screen orientation changed that was making it slower, now it is working better.
The scroller is not locking up. But sometimes, when it stops scrolling, it takes a few seconds (2/3)
to disable itself. I just want it
to be a little more dynamic, is there any way
to override
the listener and make it stop scrolling ON_ACTION_UP or something like that?
I don't want
to use
the listview because I want
to have each gallery separated by other views, now I just have text, but I will probably separate them with images with a different size than
the galleries.
I'm not really sure if this is possible with a listadapter and a listview, I assumed that a view can only handle only one type of object, so I'm using a scrollview of a layout, if I'm wrong please correct me :)
Also this activity works as a preview or selecting
the pictures you want
to view in full size and manage their values. So its working only with thumbnails. Each one weights 40 kb. Guessing that is very unlikely that a user gets more than 1000~1500 pictures in this view, i thought that
the activity wouldn't use more than 40~50 mb of ram in this case, adding 10 more if I open
the fullsized view. So I guessed as well most devices are able
to display this view in full size. If it doesn't work on low-end devices my plan was
to add an option in
the app preferences
to let user chop this view according
to some database values.
And a last reason is that during most of this activity "life-cycle" (the app has pics that are relevant
to the view, when it ends
the value that selects which pictures are displayed has
to change and no more pictures are added inside this instance of this activity);
the view will be unpopulated, so most of
the time showing everything wont cost much, just at
the end of its cycle
That was more or less what I thought at
the time i created this layout. I'm open
to any sort of suggestion or opinion, I just created this layout a few days ago and I'm trying
to see if it can work right, because it suits my app needs. Though if there is a better way i would love
to hear it
Thanks
Mateo
