I have a database which has a name of an animal, and in an other column a sound of the animal.
The listview works fine, and now I would like to extend it with an image out of the assets.
For this I've read about how to get the assets data and use it.
An example I've tried worked fine for me.
Now I want this "assets" code (at least I think I want this) in the extended BaseAdapter class.
Unfortunately I'm doing something wrong as I can't use the getAssets() in the BaseAdapter.
The problem starts in the try-catch block: " getAssets " doesn't get recognized
Which way would I think of solving this?
Creating another class in which this assets code can run in an extended "Activity"?
Or are there better ways of showing an image via database info in a listview?
Thank you for your support in my quest to get familiar with Android / Java.
public View getView(int position, View convertView, ViewGroup parent) {
// get view reference
View view = convertView;
// if null
if(view == null) {
// inflate new layout
view = mInflater.inflate(R.layout.layout_list_item, null);
// create a holder
ViewHolder holder = new ViewHolder();
// find controls
holder.txtName = (TextView)view.findViewById(R.id.txtName);
holder.txtPicture = (ImageView)view.findViewById(R.id.txtPicture);
// set data structure to view
view.setTag(holder);
}
// get selected user info
UserInfo userInfo = mListUserInfo.get(position);
// if not null
if(userInfo != null) {
// query data structure
ViewHolder holder = (ViewHolder)view.getTag();
// set data to display
holder.txtName.setText(userInfo.getName() + ", " + userInfo.getPicture() );
try {
// get input stream
InputStream ips = getAssets().open( userInfo.getPicture() + ".jpg");
Log.d("Imageloading", "Reading: " + ips);
// load image as Drawable
Drawable d = Drawable.createFromStream(ips, null);
// set image to ImageView
holder.txtPicture.setImageDrawable( d );
}
catch(IOException ex) {
Log.e("Imageloading", "Could not load '" + ex.getMessage()+ "'!");
}
}
// return view
return view;
}
I've just edited the code.
To solve the getAssets() thing I've done the following:
holder.txtPicture.setImageDrawable( getSomePicture(null, userInfo.getPicture() + ".jpg") );
public Drawable getSomePicture(Context myContext, String WhichPicture) throws IOException {
// get input stream
InputStream ips = myContext.getAssets().open( WhichPicture );
Log.d("Imageloading", "Reading: " + ips);
// load image as Drawable
Drawable d = Drawable.createFromStream(ips, null);
return d;
}
This still is not the solution, researching some more....
Found an interesting source for Lazy Loading
to call getAssets() function in non-activity class you need reference to Context. In your updated code you called function 'getSomePicture()' and passed null to myContext parameter. that means your code will fail because you have myContext.getAssets() later in your method code.
try to do this in your getView method:
Context context = getContext();
holder.txtPicture.setImageDrawable( getSomePicture(context, userInfo.getPicture() + ".jpg") );
You won't have access to the getAssets() method because that is a method that only the Context (and it's subclass, Activity) have. What I find is easiest here is to make your BaseAdapter subclasses private inner classes of the Activity in which it is to be used. That way, you'll have access to the getAssets() method.
Here is what this might look like:
public class YourExampleActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout);
}
private class YourListAdapter extends BaseAdapter {
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// get view reference
View view = convertView;
// if null
if(view == null) {
// inflate new layout
view = mInflater.inflate(R.layout.layout_list_item, null);
// create a holder
ViewHolder holder = new ViewHolder();
// find controls
holder.txtName = (TextView)view.findViewById(R.id.txtName);
holder.txtPicture = (ImageView)view.findViewById(R.id.txtPicture);
// set data structure to view
view.setTag(holder);
}
// get selected user info
UserInfo userInfo = mListUserInfo.get(position);
// if not null
if(userInfo != null) {
// query data structure
ViewHolder holder = (ViewHolder)view.getTag();
// set data to display
holder.txtName.setText(userInfo.getName() + ", " + userInfo.getPicture() );
try {
// get input stream
InputStream ips = getAssets().open( userInfo.getPicture() + ".jpg");
Log.d("Imageloading", "Reading: " + ips);
// load image as Drawable
Drawable d = Drawable.createFromStream(ips, null);
// set image to ImageView
holder.txtPicture.setImageDrawable( d );
}
catch(IOException ex) {
Log.e("Imageloading", "Could not load '" + ex.getMessage()+ "'!");
}
}
// return view
return view;
}
// Override other key methods of BaseAdapter here
}
}
Alternatively, you could take in a Context object in the constructor when the BaseAdapter subclass is instantiated, and keep a reference to that with which to call getAssets() on. Please post a comment if you need an example of this.
Related
I am fetching JSON Data to listView successfully, but i want to change the color of the textView in that listView by comparing JSON data.
For ex-
if in JSON {"status":"approved"} - green color
else if {"status" : "disapproved"} - red color
I'm able to change it using getView in SimpleAdapter but not able to compare strings there.
when i print the status, its is only showing "approved".
i can't filter "disapproved" in else if condition.
SimpleAdapter adapter = new SimpleAdapter(getActivity(), mylist, R.layout.list_leave_approval,
new String[]{
TAG_STATUS
},
new int[]{
R.id.status}) {
#Override
public View getView(int position, View convertView, ViewGroup parent) {
//return super.getView(position, convertView, parent);
View v = convertView;
if (v == null) {
// View v = convertView;
LayoutInflater vi = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.list_leave_approval, null);
TextView test = (TextView) v.findViewById(R.id.status);
// String str = jsonObject.getString("status");
Log.d("Day", "get view STATUS: " + strStatus);
// jsonObject = jsonArray.getJSONObject(i);
if (strStatus.equals(" Approved ")) {
test.setBackgroundColor(getResources().getColor(R.color.green));
// txtStatus.setText("DEC");
} else if (strStatus.equals(" Disapproved ")) {
test.setBackgroundColor(getResources().getColor(android.R.color.holo_red_light));
}
}
return super.
getView(position, v, parent);
}
};
list.setAdapter(adapter);
You can do like this.
Here string will be your parsed json string.
JSONObject jObj = new JSONObject(String);
if (jObj.getString("status").equalsIgnoreCase("approved")) {
textView1.setTextColor(Color.GREEN)
} else {
textView1.setTextColor(Color.RED)
}
I advise you to read about MVC design pattern
You should keep your JSON in a data object (model in MVC) for example Status object and put all the needed data from json to this object
When filling the listView adjust the view according to the statuses:
if(items[index].getStatus.equals("approved"))
textView.setTextColor(ContextCompat.getColor(context, R.color.green));
else if(items[index].getStatus.equals("disapproved"))
textView.setTextColor(ContextCompat.getColor(context, R.color.red));
You will need to override a more complex type of Adapter in order to do what you want, SimpleAdapter only allows setting the text in a very simple way as a String.
Something like ArrayAdapter might be a better fit, in that case you could use the code Michael A has shown in the getView method of ArrayAdapter to change the display of the text.
You might also look into SpannableString which allows adding color to text, but this would require being able to provide code to determine the status of the item.
I am going to develop a APP where i am using customize alert dialog. Data have come from database to this alert-dialog.
menu_to_showdialogCursor = dh.rawQuery("SELECT _id ,item_name,Item_cost FROM order_customer WHERE item_name LIKE ? AND Item_cost LIKE ?", new String[]{"%","%"});
OrderListAdapter orderAdapter = new OrderListAdapter(MainScreen.this,menu_to_showdialogCursor );
orderList.setAdapter(orderAdapter);
ABove line is calling my Adapter class.Now i ma going to show my getView() in adapter class
public View getView(int position, View convertView, ViewGroup parent) {
OrderViewHolder orderViewHolder = null;
if (convertView == null) {
orderViewHolder = new OrderViewHolder();
convertView = inflater.inflate(R.layout.order_list_row, null);
orderViewHolder.setTvTitle((TextView) convertView
.findViewById(R.id.orderTitle));
orderViewHolder.setTvPrice((TextView) convertView
.findViewById(R.id.orderPrice));
orderViewHolder.setIvDelete((ImageButton) convertView
.findViewById(R.id.deleteOrder));
convertView.setTag(orderViewHolder);
} else {
orderViewHolder = (OrderViewHolder) convertView.getTag();
}
if (position != 0)
{
System.out.println(" value of position :"+position);
List lit = new ArrayList();
List litp = new ArrayList();
// System.out.println(" value of postion of cursor : ");
OrderViewHolder odr_obj = null;
if (oStarterCursor.moveToFirst()) {
do{
odr_obj = new OrderViewHolder();
title = oStarterCursor.getString(oStarterCursor.getColumnIndex("item_name"));
System.out.println("value of title :"+title);
lit.add(title);
price = oStarterCursor.getString(oStarterCursor.getColumnIndex("Item_cost"));
System.out.println("value of price :"+price);
litp.add(price);
}while(oStarterCursor.moveToNext());
}
// _id = oStarterCursor.getInt(oStarterCursor.getColumnIndex("_id"));
if (title != null) {
title = title.trim();
Iterator it = lit.iterator();
while (it.hasNext()) {
int i =0;
//System.out.println(" data iterator "+it.next().toString());
String test =it.next().toString();
System.out.println(" iterator vavue :"+test);
orderViewHolder.getTvTitle().setText(test);
}
orderViewHolder.getTvTitle().setTextColor(R.color.black);
orderViewHolder.getTvTitle().setTextSize(12);
orderViewHolder.getTvTitle().setTypeface(Typeface.DEFAULT);
orderViewHolder.getTvTitle().setGravity(
Gravity.CENTER_VERTICAL);
}
if (price != null) {
price = price.trim();
orderViewHolder.getTvPrice().setText(price + ".00");
orderViewHolder.getTvTitle().setTextColor(R.color.black);
orderViewHolder.getTvTitle().setTextSize(12);
orderViewHolder.getTvTitle().setTypeface(Typeface.DEFAULT);
orderViewHolder.getTvTitle().setGravity(
Gravity.CENTER_VERTICAL);
}
//_id = oStarterCursor.getInt(oStarterCursor.getColumnIndex("_id"));
//convertView.setTag(R.id.orderTitle, _id);
if (orderViewHolder.getIvDelete() != null) {
//orderViewHolder.getIvDelete().setTag(R.id.orderTitle, _id);
}
}
return convertView;}
Problem is that in my data base there is two row as in below image..
But in my alert dialog only showing one row twice. I did not get where is logical mistake.For conveniences i am going to show my screen-shot
So Where is problem i can't get please some body help me take out of this problem.
I think it's your line :
if (position != 0)
The first line of an adapter is 0 so it will not set the data for the first line of data.
I believe its because you are using getView wrong, getView does not just get called once it gets called many times. you are looping through your cursor each time getView is called so you are only displaying the last item in the cursor after you loop through your 2 lists.
if you are getting data from a cursor you should be using SimpleCursorAdapter and then override bindView and just use the cursor variable in the method each time its called
Edit
basically along the lines of this
oStarterCursor.moveToPosition(position);
orderViewHolder.getTvTitle().setText(oStarterCursor.getString(oStarterCursor.getColumnIndex("item_name")));
is all you need to get the data really
I am trying to add dynamic textview to listview items.textviews can be of 1-2 or more than that depending on data I have succeed in adding the textview but problem is textviews are repeated on scroll.
I am creating new object of textview each time in loop.I am aware of the problem that android tries to reuse existing view but i have to add new view every time.
Here is my code in custom adapter:
public class ViewHolder {
TextView text1;
LinearLayout linearLayout;
TextView t;
TextView t1;
}
getView method
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.two_item_icon_text, null);
holder = new ViewHolder();
holder.text1 = (TextView) convertView.findViewById(R.id.text1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.linearLayout = (LinearLayout) convertView.findViewById(R.id.lin_lay_dynamic);
holder.text1.setText("" + DATA1[position]);
String tmp, dateparsed;
dateparsed = DATA1[position].substring(0, DATA1[position].indexOf(":"));
for (int x = 0; x < calendareventholder1.size(); x++) {
objHolder = (CalendarEventHolder) calendareventholder1.get(x);
if (objHolder.opendate.equals(displaydate[current])) {
tmp = objHolder.dtstarttime.toString().substring(0, objHolder.dtstarttime.toString().indexOf(":"));
if (Integer.parseInt(tmp) >= Integer.parseInt(dateparsed) && Integer.parseInt(tmp) < Integer.parseInt(dateparsed) + 1) {
holder.t = new TextView(convertView.getContext());
holder.t.setText(":-d ");
holder.t.setOnClickListener(this);
if (Common.isChildSessionAlerted(String.valueOf(objHolder.id), getApplicationContext(), object1)) {
holder.t.setText(holder.t.getText() + objHolder.dtstarttime + " " + objHolder.dtendtime + " :-a");
} else {
holder.t.setText(holder.t.getText() + objHolder.dtstarttime + " " + objHolder.dtendtime);
}
holder.t.setTag(objHolder.id);
holder.t.setTextSize(Common.getPreferenceInt(getApplicationContext(), Common.PREF_FONT_SIZE, 10));
holder.t.setTextColor(Color.BLACK);
holder.t.setText(getSmiledText(ScheduleActivity.this,
holder.t.getText().toString()));
holder.linearLayout.addView(holder.t);
holder.t1 = new TextView(convertView.getContext());
holder.t1.setOnClickListener(this);
holder.t1.setText(objHolder.title);
holder.t1.setTag(objHolder.id);
holder.t1.setTextSize(Common.getPreferenceInt(getApplicationContext(), Common.PREF_FONT_SIZE, 10));
holder.t1.setTextColor(Color.BLACK);
holder.linearLayout.addView(holder.t1);
}
}
}
return convertView;
}
Its a little hard to really understand what is in holder since it isn't super descriptive, but if I am reading your question right, the reason you are getting repeated items is because you are just adding Views and never deleting what was there before. ListView recycles views, meaning what was there previously stays there. As it scrolls it actually keeps reusing views rather than creating new ones. I won't go into detail because there are a bunch of question on here with similar problems. But at the top you should do
getView() {
/*previous stuff, and holder.linearLayout must have been set!*/
if(holder.linearLayout.getChildCount() > 0)
holder.linearLayout.removeAllViews();
This way any views already there will be removed. One last thing, you should also check out this. Immensely helpful in understanding why you have to do what I posted.
I have ListView with icons. Every ListView row either has a different icon or or doesn't have an icon.
I am able to get correct icons for rows which should have them but problem is, in rows where there shouldn't be any icon there is some icon.
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.list_item, null);
TextView title = (TextView) vi.findViewById(R.id.name);
ImageView icon = (ImageView) vi.findViewById(R.id.icon);
HashMap<String, String> item = new HashMap<String, String>();
item = data.get(position);
String imgPath = ASSETS_DIR + item.get(myTable.KEY_PIC) + ".png";
try {
Bitmap bitmap = BitmapFactory.decodeStream(vi
.getResources().getAssets().open(imgPath));
icon.setImageBitmap(bitmap);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
title.setText(item.get(myTable.KEY_NAME));
return vi;
}
KEY_PIC always has a value and if KEY_PIC's value is equal to some icon's filename only then it should show icon. I cant figure out how to code it. I should do something in if-else i guess.
Firstly you've done a bad thing by putting HashMap<String, String> item = new HashMap<String, String>(); in your getView(). Right now you're making a new one of these for every row re-shown and that's unneeded. just delete it and use:
String imgPath = ASSETS_DIR + data.get(position).get(myTable.KEY_PIC) + ".png";
Quite honestly i can't understand how it is that you see an icon if you claim that your path doesn't lead to anything if the row isn't supposed to be showing something. If it worked well, then you could simply catch the exception that might occur upon setting and do nothing with it. Looking into the actual value of data at that position should yield insight. if it were me, i'd just put null at those positions.
A temporary alternative solution is to make a boolean array for each of the positions in your listview and then only perform your icon setting if the value at that position checks out.
boolean[] varIcon = {
true,
false,
false,
true,
false,
true };
// ...
// then in the getView() now;
if (varIcon[position] == true) {
String imgPath = ASSETS_DIR + data.get(position).get(myTable.KEY_PIC) + ".png";
try {
Bitmap bitmap = BitmapFactory.decodeStream(vi
.getResources().getAssets().open(imgPath));
icon.setImageBitmap(bitmap);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
The likely problem is that the views are getting recycled and you're never clearing the image that was previously set, try this to prove it:
String imgPath = ASSETS_DIR + item.get(myTable.KEY_PIC) + ".png";
try {
Bitmap bitmap = BitmapFactory.decodeStream(vi
.getResources().getAssets().open(imgPath));
icon.setImageBitmap(bitmap);
} catch (Exception e) {
e.printStackTrace();
icon.setImageDrawable(null);
}
However, relying on exception handling for a perfectly valid outcome is not a good practice (nor performance friendly). I would recommend you make your myTable.KEY_PIC column return null, and then you can do:
String imageName = item.get(myTable.KEYP_PIC);
if (imageName == null) {
icon.setImageDrawable(null);
} else {
//your code
}
Which is much cleaner.
I managed to pull the layouts, and i add it to my viewflipper, however, there it is loaded as blank.
The code is,
Resources packageResources;
Context packageContext;
try
{
packageResources = pm.getResourcesForApplication(packageName);
packageContext = this.createPackageContext(packageName, Context.CONTEXT_INCLUDE_CODE + Context.CONTEXT_IGNORE_SECURITY);
}
catch(NameNotFoundException excep)
{
// the package does not exist. move on to see if another exists.
}
Class layoutClass;
try
{
// using reflection to get the layout class inside the R class of the package
layoutClass = packageContext.getClassLoader().loadClass(packageName + ".R$layout");
}
catch (ClassNotFoundException excep1)
{
// Less chances that class won't be there.
}
for( Field layoutID : layoutClass.getFields() )
{
try
{
int id = layoutID.getInt(layoutClass);
XmlResourceParser xmlResourceLayout = packageResources.getLayout(id);
View v = new View(this, Xml.asAttributeSet(xmlResourceLayout));
this.viewFlipper.addView(v);
}
catch (Exception excep)
{
continue;
}
}
I get no errors, and i debugged and checked. The layout IDs are correct. However, in my viewFlipper its just blank. No warnings or errors i can find.
Finally got it.... Its actually simple !!!!
Here is what i did...
In the target apk, there is only resources and layouts with no application or activity code. I created a class,
public final class ViewExtractor
{
private static final int NUMBER_OF_LAYOUTS = 5;
public static View[] getAllViews(Context context)
{
View[] result = new View[ViewExtractor.NUMBER_OF_LAYOUTS];
result[0] = View.inflate(context, R.layout.layout_0, null);
result[1] = View.inflate(context, R.layout.layout_1, null);
result[2] = View.inflate(context, R.layout.layout_2, null);
result[3] = View.inflate(context, R.layout.layout_3, null);
result[4] = View.inflate(context, R.layout.layout_4, null);
return result;
}
}
Then in my current application, I modified my earlier code. The modification takes place once package has been verified to exist.
// If the package exists then get the resources within it.
// Use the method in the class to get the views.
Class<?> viewExtractor;
try
{
viewExtractor = packageContext.getClassLoader().loadClass(packageName + ".ViewExtractor");
}
catch (ClassNotFoundException excep)
{
continue;
}
View[] resultViews;
try
{
Method m = viewExtractor.getDeclaredMethod("getAllViews", Context.class);
resultViews= (View[])m.invoke(null, new Object[]{packageContext});
for( View v : resultViews)
{
this.viewFlipper.addView(v);
}
}
catch (Exception excep)
{
excep.printStackTrace();
}
You are not inflating a layout. You are creating an empty View and adding it to your ViewFlipper.
I am currently doing this. It only works if a know the packageName of activity or fragment from the .apk that should provide the layout hierarchy (I call this foreign context). And you need to know the name of the layout you want to inflate (e.g. R.layout.mylayout -> "mylayout")
Context c = createPackageContext(foreignPackageName,
Context.CONTEXT_INCLUDE_CODE|Context.CONTEXT_IGNORE_SECURITY); //create foreign context
int resId = c.getResources.getIdentifier(mylayoutName,"layout",foreignPackageName);
LayoutInflater myInflater = LayoutInflater.from(c); //Inflater for foreign context
View myLayout = myInflater.inflate(resId,null,false); //do not attach to a root view