Hi,
The offending line is this:
ContactsContract.Contacts
Even though you're not referencing this nested member on the execution
path, the Java VM still tries to resolve all external references made by
your code. This is done when your code is first loaded into memory for
execution, before it is run. At this point, the external reference fails
(since you are on Android 1.5), and your code is not able to load and
execute.
The solution is to use Java Reflection feature to not make any
compile-time references to missing classes / members, but rather check
at runtime whether they exist. This way, there are no compile-time
references to stuff that only exists in later API levels, and your code
can gracefully fall back to earlier APIs at runtime.
The key is what references your code makes at compile time, and, as a
consequence, when your class is loaded into memory.
http://java.sun.com/developer/technicalArticles/ALT/Reflection/
That is the general solution.
However, in this particular case, you could duplicate the URI string from
ContactsContract.Contacts.CONTENT_URI
to some string constant in your code. Just like this:
class YourClass {
private static final String ANDROID_1_X_CONTACTS_URI = People.CONTENT_URI;
private static final String ANDROID_2_X_CONTACTS_URI = "content://<put
correct value here>";
}
Then use the appropriate constant (one of the two) based on API level
just like you're trying to do now.
-- Kostya
27.07.2010 18:10, [email protected] пишет:
I have the following piece of code in my Android application that
looks up a contacts ID, I have just changed the target from 1.5 to 2.2
but with a min SDK of 3 (1.5) so that I can use the ContactsContract
Uri in 2.2 and the People Uri in 1.5.
However the code leads to the following error when run on 1.5 devices:
07-27 15:02:53.382: WARN/dalvikvm(12656): VFY: unable to resolve
static field 25 (CONTENT_URI) in Landroid/provider/ContactsContract
$Contacts;
---
> From google I have garnered that I need to use reflection in this case
to allow the application run on both versions of Android?
I have seen example's of how to use reflection to use methods of
multiple/different versions but how can I use it in mycase where I
want to use the ContactsContract Uri?
Here is my code:
---
findViewById(R.id.contactimage).setOnClickListener(new
OnClickListener() {
public void onClick(View v) {
String sdk = android.os.Build.VERSION.SDK;
Uri contactUri;
Log.d("CDA", "Contact ID Button pressed = " +
contactId);
if(sdk.equals("8")){
contactUri = ContentUris.withAppendedId
(ContactsContract.Contacts.CONTENT_URI,
contactId);
Intent intent = new
Intent(Intent.ACTION_VIEW,
contactUri);
startActivity(intent);
}
else{
contactUri = ContentUris.withAppendedId
(People.CONTENT_URI, contactId);
Intent intent = new Intent(Intent.ACTION_VIEW,
contactUri);
startActivity(intent);
}
dispatchKeyEvent(new
KeyEvent(KeyEvent.ACTION_DOWN,KeyEvent.FLAG_SOFT_KEYBOARD));
dispatchKeyEvent(new
KeyEvent(KeyEvent.ACTION_UP,
KeyEvent.KEYCODE_BACK));
}
});
--
Kostya Vasilev -- WiFi Manager + pretty widget -- http://kmansoft.wordpress.com
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