import org.jf.dexlib.Code.Format.Instruction21c; //导入依赖的package包/类
private void findFieldsSetInStaticConstructor() {
    fieldsSetInStaticConstructor = new SparseArray<FieldIdItem>();

    if (classDataItem == null) {
        return;
    }

    for (ClassDataItem.EncodedMethod directMethod: classDataItem.getDirectMethods()) {
        if (directMethod.method.getMethodName().getStringValue().equals("<clinit>") &&
                directMethod.codeItem != null) {
            for (Instruction instruction: directMethod.codeItem.getInstructions()) {
                switch (instruction.opcode) {
                    case SPUT:
                    case SPUT_BOOLEAN:
                    case SPUT_BYTE:
                    case SPUT_CHAR:
                    case SPUT_OBJECT:
                    case SPUT_SHORT:
                    case SPUT_WIDE:
                        Instruction21c ins = (Instruction21c)instruction;
                        FieldIdItem fieldIdItem = (FieldIdItem)ins.getReferencedItem();
                        fieldsSetInStaticConstructor.put(fieldIdItem.getIndex(), fieldIdItem);
                }
            }
        }
    }
}