android - PNG file won't display in ImageView if source is set programatically -

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i have png file in res/drawable-ldpi folder. i'm working in eclipse emulator, i've tried on 2.2.1 android phone , same behavior. have imageview , want set src programatically, based on database call. if put 

src="@drawable.norusdpyr"

in activity's xml file, file displays fine. but, if put

string imageresource = "r.drawable." + parseddata[4].tostring(); chart.setimageuri(uri.parse(imageresource));

where parseddata[4].tostring() = "nor_usdpyr" don't see anything. i've tried

string imageresource = "android.resource://" + getpackagename() + "/r.drawable." + parseddata[4].tostring(); chart.setimageuri(uri.parse(imageresource));

and

inputstream = getclass().getresourceasstream("/drawable/" + parseddata[4].tostring()); chart.setimagedrawable(drawable.createfromstream(is, ""));

and

string imageresource = "r.drawable." + parseddata[4].tostring();    file file = new file(imageresource); chart.setimagedrawable(drawable.createfrompath(file.getabsolutepath()));

and

context context = getapplicationcontext(); int resid = context.getresources().getidentifier(imageresource, "drawable", "com.knitcard.project"); chart.setimageresource(resid);

finally,

chart.setimageuri(uri.parse("android.resource://" + getpackagename() + "/r.drawable.nor_usdpyr"));

doesn't work.

none of these work. doing wrong? thanks!

first, shouldn't working:

src="@drawable.norusdpyr"

the correct way is:

android:src="@drawable/norusdpyr"

second, string ids use in xml valid in xml. when resources built, strings replaced respective integer values. ideally, won't need load package resource string name. if do, can field such name, integral value holds, , call setimageresource. quite close version:

int resid = context.getresources().getidentifier(imageresource, "drawable", "com.knitcard.project"); chart.setimageresource(resid);

except imageresource should have been parseddata[4].tostring() no r.drawable. prefix. can use context.getpackagename() instead of hardcoding package name.


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