At first start and once per day the application asks the Dexcom server for compatibility of the used device. The following modifications remove this behaviour from the application.
The file /src/smali/com/android/databinding/library/baseAdapters/c.smali implements the compatibility check. The function performAppCompatibilityServerIO initiates the request to the Dexcom server and looks somewhat like that:
public class c implements b {
// some code before...
public void performAppCompatibilityServerIO(AppRuntimeInfo var1, String var2, com.dexcom.cgm.appcompatability.a var3) {
this.m_validityResult = this.checkValidity(var1);
if (!Objects.equals(this.m_validityResult.getMessageId(), "00000000-0000-0000-0000-000000000000")) {
this.m_getMessageResult = this.getMessage(UUID.fromString(this.m_validityResult.getMessageId()), var2);
}
if (var3 != null) {
var3.serverCallFinished();
} else {
throw new IllegalArgumentException("AppCompatCompleteListener was null when server call was complete");
}
}
// some code after...
}This modification removes the request and just returns a successful response:
public class c implements b {
// some code before...
public void performAppCompatibilityServerIO(AppRuntimeInfo var1, String var2, com.dexcom.cgm.appcompatability.a var3) {
this.m_validityResult = new ValidityResult();
this.m_validityResult.setValidity("ValidEnvironment");
this.m_validityResult.setMessageId("00000000-0000-0000-0000-000000000000");
if (var3 != null) {
var3.serverCallFinished();
} else {
throw new IllegalArgumentException("AppCompatCompleteListener was null when server call was complete");
}
}
// some code after...
}The modification translated into smali code looks like this:
.method public performAppCompatibilityServerIO(Lcom/dexcom/cgm/model/AppRuntimeInfo;Ljava/lang/String;Lcom/dexcom/cgm/appcompatability/a;)V
.locals 2
new-instance v0, Lcom/dexcom/cgm/model/ValidityResult;
invoke-direct {v0}, Lcom/dexcom/cgm/model/ValidityResult;-><init>()V
iput-object v0, p0, Lcom/android/databinding/library/baseAdapters/c;->m_validityResult:Lcom/dexcom/cgm/model/ValidityResult;
iget-object v0, p0, Lcom/android/databinding/library/baseAdapters/c;->m_validityResult:Lcom/dexcom/cgm/model/ValidityResult;
const-string v1, "ValidEnvironment"
invoke-virtual {v0, v1}, Lcom/dexcom/cgm/model/ValidityResult;->setValidity(Ljava/lang/String;)V
iget-object v0, p0, Lcom/android/databinding/library/baseAdapters/c;->m_validityResult:Lcom/dexcom/cgm/model/ValidityResult;
const-string v1, "00000000-0000-0000-0000-000000000000"
invoke-virtual {v0, v1}, Lcom/dexcom/cgm/model/ValidityResult;->setMessageId(Ljava/lang/String;)V
if-eqz p3, :cond_0
invoke-interface {p3}, Lcom/dexcom/cgm/appcompatability/a;->serverCallFinished()V
return-void
:cond_0
new-instance v0, Ljava/lang/IllegalArgumentException;
const-string v1, "AppCompatCompleteListener was null when server call was complete"
invoke-direct {v0, v1}, Ljava/lang/IllegalArgumentException;-><init>(Ljava/lang/String;)V
throw v0
.end methodThe file /src/smali/com/dexcom/cgm/activities/AppCompatabilityActivity.smali implements the compatibility screen. It shows an error message in case the Dexcom server denied compatibility for the device.
The function serverCallFinished is executed after the application received a response from the Dexcom server. It looks somewhat like that:
public class AppCompatabilityActivity extends DexBaseActivity implements OnAppInitListener, a {
// some code before...
public void serverCallFinished() {
this.setNextCheckTimeToTomorrow();
if (Objects.equals(this.getAppCompatibilityService().getValidity().getMessageId(), "00000000-0000-0000-0000-000000000000")) {
this.goDirectlyToNextActivity();
} else {
this.m_validityResult = this.getAppCompatibilityService().getValidity();
this.m_getMessageResult = this.getAppCompatibilityService().getMessageResult();
this.processNewAppCompatability();
this.m_isFreshInstall = false;
}
}
// some code after...
}This modification ignores the response and redirects to the next view:
public class AppCompatabilityActivity extends DexBaseActivity implements OnAppInitListener, a {
// some code before...
public void serverCallFinished() {
this.setNextCheckTimeToTomorrow();
this.goDirectlyToNextActivity();
}
// some code after...
}The modification translated into smali code looks like this:
.method public serverCallFinished()V
.locals 0
invoke-direct {p0}, Lcom/dexcom/cgm/activities/AppCompatabilityActivity;->setNextCheckTimeToTomorrow()V
invoke-direct {p0}, Lcom/dexcom/cgm/activities/AppCompatabilityActivity;->goDirectlyToNextActivity()V
return-void
.end method