Lazarus
Programming => Operating Systems => Android => Topic started by: stab on May 07, 2013, 04:53:01 pm
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Modified the code to get compass direction and got a little further.
Changed to code to use SensorManager.getOrientation but returned values are all zero.
Modified code as:
procedure TfrmJNITestMain.btnCompassClick(Sender: TObject);
var
sensorManagerClass, sensorClass : jclass;
sensorManagerObject, sensorObject : jobject;
javaMethodId_getRotationMatrix, javaMethodId_getOrientation : JMethodID;
javaString_SENSOR_SERVICE, javaString_getRotationMatrix, javaString_getOrientation : jstring;
lParams : array[0..4] of JValue;
IsCopy : JBoolean;
mGData,MData, mOrientation : JDoubleArray;
mR, mI : JDoubleArray;
arraydata : PDouble;
arraylen : jsize;
i : integer;
begin
// get sensorManagerClass
sensorManagerClass := javaEnvRef^^.FindClass(javaEnvRef, 'android/hardware/SensorManager');
if sensorManagerClass = nil then
debugln('******** sensorManagerClass NIL ********')
else
debugln('******** sensorManagerClass NOT NIL ********');
// get the string Context.SENSOR_SERVICE remember that NewStringUTF does not require ReleaseStringUTFChars
javaString_SENSOR_SERVICE := javaEnvRef^^.NewStringUTF(javaEnvRef, pchar('sensor'));
// Get the sensorManagerObject
lParams[0].l := javaString_SENSOR_SERVICE;
sensorManagerObject :=
javaEnvRef^^.CallObjectMethodA(javaEnvRef, javaActivityObject, javaMethod_getSystemService, @lParams[0]);
if sensorManagerObject = nil then
debugln('******** sensorManagerObject NIL ********')
else
debugln('******** sensorManagerObject NOT NIL ********');
// get MethidId for getRotationMatrix
javaMethodId_getRotationMatrix :=
javaEnvRef^^.GetStaticMethodID(javaEnvRef, sensorManagerClass, 'getRotationMatrix', '([F[F[F[F)Z');
if javaMethodId_getRotationMatrix = nil then
debugln('******** javaMethodId_getRotationMatrix NIL ********')
else
debugln('******** javaMethodId_getRotationMatrix NOT NIL ********');
mR := javaEnvRef^^.NewDoubleArray(javaEnvRef, 16);
mI := javaEnvRef^^.NewDoubleArray(javaEnvRef, 16);
mGData := javaEnvRef^^.NewDoubleArray(javaEnvRef, 3);
MData := javaEnvRef^^.NewDoubleArray(javaEnvRef, 3);
lParams[0].l := mR;
lParams[1].l := mI;
lParams[2].l := mGData;
lParams[3].l := MData;
debugln('******** After loading lParams for getRotationMatrix ********');
javaEnvRef^^.CallVoidMethodA(javaEnvRef, javaActivityObject,
javaMethodId_getRotationMatrix, @lParams[0]);
debugln('******** After getRotationMatrix ********');
// Get the elements and length
IsCopy := 0;
arraydata := javaEnvRef^^.GetDoubleArrayElements(javaEnvRef, mR, IsCopy);
arraylen := javaEnvRef^^.GetArrayLength(javaEnvRef, mR);
debugln('******** arraylen-mR: ' + IntToStr(arraylen) + ' ********');
i := 0;
while i < arraylen do
begin
debugln('******** mR[' + IntToStr(i) + ']: ' + FloatToStrF(arraydata[i], ffFixed, 15, 3) + ' ********');
Inc(i);
end;
// Get the elements and length
IsCopy := 0;
arraydata := javaEnvRef^^.GetDoubleArrayElements(javaEnvRef, mI, IsCopy);
arraylen := javaEnvRef^^.GetArrayLength(javaEnvRef, mI);
debugln('******** arraylen-mI: ' + IntToStr(arraylen) + ' ********');
i := 0;
while i < arraylen do
begin
debugln('******** mI[' + IntToStr(i) + ']: ' + FloatToStrF(arraydata[i], ffFixed, 15, 3) + ' ********');
Inc(i);
end;
// Release ArrayElements
javaEnvRef^^.ReleaseDoubleArrayElements(javaEnvRef, mI, arraydata, 0);
// Get the elements and length
IsCopy := 0;
arraydata := javaEnvRef^^.GetDoubleArrayElements(javaEnvRef, mGData, IsCopy);
arraylen := javaEnvRef^^.GetArrayLength(javaEnvRef, mGData);
debugln('******** arraylen-mGData: ' + IntToStr(arraylen) + ' ********');
i := 0;
while i < arraylen do
begin
debugln('******** mGData[' + IntToStr(i) + ']: ' + FloatToStrF(arraydata[i], ffFixed, 15, 3) + ' ********');
Inc(i);
end;
// Release ArrayElements
javaEnvRef^^.ReleaseDoubleArrayElements(javaEnvRef, mGData, arraydata, 0);
// Get the elements and length
IsCopy := 0;
arraydata := javaEnvRef^^.GetDoubleArrayElements(javaEnvRef, MData, IsCopy);
arraylen := javaEnvRef^^.GetArrayLength(javaEnvRef, MData);
debugln('******** arraylen-MData: ' + IntToStr(arraylen) + ' ********');
i := 0;
while i < arraylen do
begin
debugln('******** MData[' + IntToStr(i) + ']: ' + FloatToStrF(arraydata[i], ffFixed, 15, 3) + ' ********');
Inc(i);
end;
// Release ArrayElements
javaEnvRef^^.ReleaseDoubleArrayElements(javaEnvRef, MData, arraydata, 0);
// get MethidId for getOrientation
javaMethodId_getOrientation :=
javaEnvRef^^.GetStaticMethodID(javaEnvRef, sensorManagerClass, 'getOrientation', '([F[F)[F');
if javaMethodId_getOrientation = nil then
debugln('******** javaMethodId_getOrientation NIL ********')
else
debugln('******** javaMethodId_getOrientation NOT NIL ********');
mOrientation := javaEnvRef^^.NewDoubleArray(javaEnvRef, 3);
lParams[1].l := mOrientation;
debugln('******** After loading lParams for getOrientation ********');
javaEnvRef^^.CallVoidMethodA(javaEnvRef, javaActivityObject,
javaMethodId_getOrientation, @lParams[0]);
debugln('******** After getOrientation ********');
// Get the elements and length
IsCopy := 0;
arraydata := javaEnvRef^^.GetDoubleArrayElements(javaEnvRef, mOrientation, IsCopy);
arraylen := javaEnvRef^^.GetArrayLength(javaEnvRef, mOrientation);
debugln('******** arraylen-mOrientation: ' + IntToStr(arraylen) + ' ********');
i := 0;
while i < arraylen do
begin
debugln('******** mOrientation[' + IntToStr(i) + ']: ' + FloatToStrF(arraydata[i], ffFixed, 15, 3) + ' ********');
Inc(i);
end;
// Release ArrayElements
javaEnvRef^^.ReleaseDoubleArrayElements(javaEnvRef, mOrientation, arraydata, 0);
javaEnvRef^^.ReleaseDoubleArrayElements(javaEnvRef, mR, arraydata, 0);
javaEnvRef^^.DeleteLocalRef(javaEnvRef, lParams[0].l);
javaEnvRef^^.DeleteLocalRef(javaEnvRef, lParams[1].l);
javaEnvRef^^.DeleteLocalRef(javaEnvRef, lParams[2].l);
javaEnvRef^^.DeleteLocalRef(javaEnvRef, lParams[3].l);
end;
Thankful for advices
Regards
stab %)
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Please edit your post, use tags
[code] instead of italic.
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Excuse a dummie, but I don't know what you mean by tag in this context
/stab
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See attached.