Android NDK Practical Learning-java End Object member assignment and get object member values

1, for Java End Class and interface definition, please refer to:

Android NDK Practical Learning-get Java-side classes and their class variables

2. Assign values to the passed parameters:

• Assigning values to bool type members

Env->setbooleanfield (Jobj, Jfbdata, false);

• Assign a value to a double type member

Env->setdoublefield (Jobj, Jfddata, 209.22);

• assigning values to an int type member

Env->setintfield (Jobj, Jfidata, 3653);

• Assigning a member of type byte to a value

Env->setbytefield (Jobj, Jfcdata, );

• To assign a value to a string type

Char data[] = "4611354"; Env->setobjectfield (jobj, Jfsdata, Env->newstringutf (data));

• Assigning values to a primitive type array type

1  　　  //get int array assignment in Java2Jintarray Jint_arr = (jintarray) env->Getobjectfield (Jobj, Jiarr);3     intarrint[Ten] = {0};4      for(inti =0; I <Ten; ++i) {5Arrint[i] = -+i;6     }7Env->setintarrayregion (Jint_arr,0,Ten, arrint);8 9     //get a byte array assignment in JavaTenJfieldid Jbytearr = Env->getfieldid (Jcsetdatamgr,"Bytearr","[B"); One      Chararrbyte[Ten] ="20200825"; AJbytearray Jbyte_arr = (jbytearray) env->Getobjectfield (Jobj, Jbytearr); -Env->setbytearrayregion (Jbyte_arr,0,8, (ConstSignedChar*) arrbyte);

3, gets the value of the member variable:

• Gets the bool type member variable value

bool bdata = Env->getbooleanfield (Jcsetdatamgr, jfbdata);

• Gets the value of a double type member variable

double dData = Env->getdoublefield (Jcsetdatamgr, jfddata);

• get int type member variable value

int iData = Env->getintfield (Jcsetdatamgr, jfidata);

• Gets the byte type member variable value

char cData = Env->getbytefield (Jcsetdatamgr, jfcdata);

• Get string member Variable value

1Jfieldid jfsdata = Env->getfieldid (Jcsetdatamgr,"SData","ljava/lang/string;");2Jstring jteststr = (jstring) (env->Getobjectfield (Jcsetdatamgr, Jfsdata));3 Const Char* Teststr = env->Getstringutfchars (Jteststr, NULL);4 Chartestdata[ -] = {0};5 strcpy (TestData, teststr);6Env->releasestringutfchars (Jteststr, TESTSTR);

• Get the base type array member variable value

1Jfieldid Jiarr = Env->getfieldid (Jcsetdatamgr,"Intarr","[I");2     if(NULL = =Jiarr) {3Debug_out ("Jfbdata fail!");4     }5 6     //gets the object of the array property arrays in Java7Jintarray Jint_arr = (jintarray) env->Getobjectfield (Jobj, Jiarr);8 9     intarrint[Ten] = {0};Ten      for(inti =0; I <Ten; ++i) { OneArrint[i] = -+i; A     } -Env->getintarrayregion (Jint_arr,0,Ten, Arrint);

4, about the class contains the class can be followed by analogy, such as useful to, after the next perfect!

Android NDK Practical Learning-java End Object member assignment and get object member values